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SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1210 PM CDT Wed Jul 03 2024 Valid 041200Z - 051200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF EASTERN KANSAS...NORTHEAST OKLAHOMA...AND THE OZARKS...AS WELL AS PARTS OF THE UPPER MISSISSIPPI VALLEY... ...SUMMARY... Severe thunderstorms will be possible on Independence Day, mainly across parts of the Upper Mississippi Valley, Ozarks, and south/central Plains. ...Synopsis... An upper trough over the northern/central Plains will deepen and develop a closed low as it shifts east into the Upper Midwest/Mid-MS Valley vicinity Thursday into Thursday night. Meanwhile, a convectively enhanced vorticity max/lead shortwave impulse in the vicinity of MO Thursday morning will develop eastward across the Ohio Valley and Mid-Atlantic. At the surface, a cold front will develop east/southeast across the central/southern Plains, and the Mid/Upper MS Valley vicinity. Ahead of the front, a seasonally moist airmass will be in place, with 60s to low 70s F dewpoints widespread from the central/southern Plains into the Midwest and eastern U.S. The surface cold front, potential outflow and an MCV over the Mid-MS/OH Valley, and the upper trough/shortwave impulses will provide support for scattered strong to severe thunderstorms across portions of the Midwest into the Mid-Atlantic vicinity on Thursday. ...IA/MN/WI/northern IL Vicinity... A weak surface low will develop eastward across the Upper Midwest during the afternoon/early evening as the northern Plains upper trough shifts east. A cold front will extend into western MN into eastern NE by midday. Ahead of the front, a seasonally moist airmass will be in place with temperatures warming into the upper 70s to low 80s. Modestly steep midlevel lapse rates will further aid in weak to moderate destabilization during the afternoon (MLCAPE 1000-1500 J/kg). Vertical shear will be somewhat modest, around 25-35 kt, but will be sufficient for organized cells and a few transient supercells. Furthermore, elongated/straight forecast hodographs in combination with favorable instability parameters suggest isolated hail up to 1.75 inches diameter will be possible in addition to sporadic gusty thunderstorm winds. Given potential for severe hail, probabilities have been increased and a Slight risk (level 2 of 5) has been included for portions of the region. ...Central/Southern Plains to Mid-MS and Lower OH Valley Vicinity... Convection may be ongoing Thursday morning as a continuation from the Day 1/Wednesday period. This activity will likely result in outflow across the Ozarks and an MCV floating east across the Lower OH Valley. Vertical shear will remain weak over the OH Valley, and heating limited given early clouds and precip. However, a very moist airmass will result in weak to moderate destabilization in pockets of stronger heating. Thunderstorm clusters will pose a risk for sporadic strong gusts through the day as the convectively enhanced vorticity maxima migrates across the area. As the surface cold front advances east/southeast into northern OK and northwest MO by mid/late afternoon, additional thunderstorm development is expected across the recovering airmass over MO and along the strong differential heating gradient extending southward into OK. A very moist airmass will allow for moderate to strong destabilization amid 40+ kt effective shear magnitudes. Organized clusters/bands of storms will develop southeast ahead of the cold front, posing a risk for isolated to scattered strong/locally damaging gusts into the evening hours from eastern KS/OK into MO. Stronger cells may also pose an isolated risk for hail. More isolated, less-organized but still strong convection is expected with westward extent along the surface boundary across parts of western/central OK into the TX Panhandle. A few strong to severe gusts may accompany this activity. ...Mid-Atlantic Vicinity... Low-level warm advection and modest midlevel ascent will support isolated to scattered diurnal thunderstorms in a modestly unstable airmass. Vertical shear will be modest but sufficient for transient storm organization. High PW values, weak low-level flow and steep low-level lapse rates will support sporadic strong downbursts. ..Leitman.. 07/03/2024 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1210 PM CDT Wed Jul 03 2024 Valid 041200Z - 051200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF EASTERN KANSAS...NORTHEAST OKLAHOMA...AND THE OZARKS...AS WELL AS PARTS OF THE UPPER MISSISSIPPI VALLEY... ...SUMMARY... Severe thunderstorms will be possible on Independence Day, mainly across parts of the Upper Mississippi Valley, Ozarks, and south/central Plains. ...Synopsis... An upper trough over the northern/central Plains will deepen and develop a closed low as it shifts east into the Upper Midwest/Mid-MS Valley vicinity Thursday into Thursday night. Meanwhile, a convectively enhanced vorticity max/lead shortwave impulse in the vicinity of MO Thursday morning will develop eastward across the Ohio Valley and Mid-Atlantic. At the surface, a cold front will develop east/southeast across the central/southern Plains, and the Mid/Upper MS Valley vicinity. Ahead of the front, a seasonally moist airmass will be in place, with 60s to low 70s F dewpoints widespread from the central/southern Plains into the Midwest and eastern U.S. The surface cold front, potential outflow and an MCV over the Mid-MS/OH Valley, and the upper trough/shortwave impulses will provide support for scattered strong to severe thunderstorms across portions of the Midwest into the Mid-Atlantic vicinity on Thursday. ...IA/MN/WI/northern IL Vicinity... A weak surface low will develop eastward across the Upper Midwest during the afternoon/early evening as the northern Plains upper trough shifts east. A cold front will extend into western MN into eastern NE by midday. Ahead of the front, a seasonally moist airmass will be in place with temperatures warming into the upper 70s to low 80s. Modestly steep midlevel lapse rates will further aid in weak to moderate destabilization during the afternoon (MLCAPE 1000-1500 J/kg). Vertical shear will be somewhat modest, around 25-35 kt, but will be sufficient for organized cells and a few transient supercells. Furthermore, elongated/straight forecast hodographs in combination with favorable instability parameters suggest isolated hail up to 1.75 inches diameter will be possible in addition to sporadic gusty thunderstorm winds. Given potential for severe hail, probabilities have been increased and a Slight risk (level 2 of 5) has been included for portions of the region. ...Central/Southern Plains to Mid-MS and Lower OH Valley Vicinity... Convection may be ongoing Thursday morning as a continuation from the Day 1/Wednesday period. This activity will likely result in outflow across the Ozarks and an MCV floating east across the Lower OH Valley. Vertical shear will remain weak over the OH Valley, and heating limited given early clouds and precip. However, a very moist airmass will result in weak to moderate destabilization in pockets of stronger heating. Thunderstorm clusters will pose a risk for sporadic strong gusts through the day as the convectively enhanced vorticity maxima migrates across the area. As the surface cold front advances east/southeast into northern OK and northwest MO by mid/late afternoon, additional thunderstorm development is expected across the recovering airmass over MO and along the strong differential heating gradient extending southward into OK. A very moist airmass will allow for moderate to strong destabilization amid 40+ kt effective shear magnitudes. Organized clusters/bands of storms will develop southeast ahead of the cold front, posing a risk for isolated to scattered strong/locally damaging gusts into the evening hours from eastern KS/OK into MO. Stronger cells may also pose an isolated risk for hail. More isolated, less-organized but still strong convection is expected with westward extent along the surface boundary across parts of western/central OK into the TX Panhandle. A few strong to severe gusts may accompany this activity. ...Mid-Atlantic Vicinity... Low-level warm advection and modest midlevel ascent will support isolated to scattered diurnal thunderstorms in a modestly unstable airmass. Vertical shear will be modest but sufficient for transient storm organization. High PW values, weak low-level flow and steep low-level lapse rates will support sporadic strong downbursts. ..Leitman.. 07/03/2024 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1210 PM CDT Wed Jul 03 2024 Valid 041200Z - 051200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF EASTERN KANSAS...NORTHEAST OKLAHOMA...AND THE OZARKS...AS WELL AS PARTS OF THE UPPER MISSISSIPPI VALLEY... ...SUMMARY... Severe thunderstorms will be possible on Independence Day, mainly across parts of the Upper Mississippi Valley, Ozarks, and south/central Plains. ...Synopsis... An upper trough over the northern/central Plains will deepen and develop a closed low as it shifts east into the Upper Midwest/Mid-MS Valley vicinity Thursday into Thursday night. Meanwhile, a convectively enhanced vorticity max/lead shortwave impulse in the vicinity of MO Thursday morning will develop eastward across the Ohio Valley and Mid-Atlantic. At the surface, a cold front will develop east/southeast across the central/southern Plains, and the Mid/Upper MS Valley vicinity. Ahead of the front, a seasonally moist airmass will be in place, with 60s to low 70s F dewpoints widespread from the central/southern Plains into the Midwest and eastern U.S. The surface cold front, potential outflow and an MCV over the Mid-MS/OH Valley, and the upper trough/shortwave impulses will provide support for scattered strong to severe thunderstorms across portions of the Midwest into the Mid-Atlantic vicinity on Thursday. ...IA/MN/WI/northern IL Vicinity... A weak surface low will develop eastward across the Upper Midwest during the afternoon/early evening as the northern Plains upper trough shifts east. A cold front will extend into western MN into eastern NE by midday. Ahead of the front, a seasonally moist airmass will be in place with temperatures warming into the upper 70s to low 80s. Modestly steep midlevel lapse rates will further aid in weak to moderate destabilization during the afternoon (MLCAPE 1000-1500 J/kg). Vertical shear will be somewhat modest, around 25-35 kt, but will be sufficient for organized cells and a few transient supercells. Furthermore, elongated/straight forecast hodographs in combination with favorable instability parameters suggest isolated hail up to 1.75 inches diameter will be possible in addition to sporadic gusty thunderstorm winds. Given potential for severe hail, probabilities have been increased and a Slight risk (level 2 of 5) has been included for portions of the region. ...Central/Southern Plains to Mid-MS and Lower OH Valley Vicinity... Convection may be ongoing Thursday morning as a continuation from the Day 1/Wednesday period. This activity will likely result in outflow across the Ozarks and an MCV floating east across the Lower OH Valley. Vertical shear will remain weak over the OH Valley, and heating limited given early clouds and precip. However, a very moist airmass will result in weak to moderate destabilization in pockets of stronger heating. Thunderstorm clusters will pose a risk for sporadic strong gusts through the day as the convectively enhanced vorticity maxima migrates across the area. As the surface cold front advances east/southeast into northern OK and northwest MO by mid/late afternoon, additional thunderstorm development is expected across the recovering airmass over MO and along the strong differential heating gradient extending southward into OK. A very moist airmass will allow for moderate to strong destabilization amid 40+ kt effective shear magnitudes. Organized clusters/bands of storms will develop southeast ahead of the cold front, posing a risk for isolated to scattered strong/locally damaging gusts into the evening hours from eastern KS/OK into MO. Stronger cells may also pose an isolated risk for hail. More isolated, less-organized but still strong convection is expected with westward extent along the surface boundary across parts of western/central OK into the TX Panhandle. A few strong to severe gusts may accompany this activity. ...Mid-Atlantic Vicinity... Low-level warm advection and modest midlevel ascent will support isolated to scattered diurnal thunderstorms in a modestly unstable airmass. Vertical shear will be modest but sufficient for transient storm organization. High PW values, weak low-level flow and steep low-level lapse rates will support sporadic strong downbursts. ..Leitman.. 07/03/2024 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1210 PM CDT Wed Jul 03 2024 Valid 041200Z - 051200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF EASTERN KANSAS...NORTHEAST OKLAHOMA...AND THE OZARKS...AS WELL AS PARTS OF THE UPPER MISSISSIPPI VALLEY... ...SUMMARY... Severe thunderstorms will be possible on Independence Day, mainly across parts of the Upper Mississippi Valley, Ozarks, and south/central Plains. ...Synopsis... An upper trough over the northern/central Plains will deepen and develop a closed low as it shifts east into the Upper Midwest/Mid-MS Valley vicinity Thursday into Thursday night. Meanwhile, a convectively enhanced vorticity max/lead shortwave impulse in the vicinity of MO Thursday morning will develop eastward across the Ohio Valley and Mid-Atlantic. At the surface, a cold front will develop east/southeast across the central/southern Plains, and the Mid/Upper MS Valley vicinity. Ahead of the front, a seasonally moist airmass will be in place, with 60s to low 70s F dewpoints widespread from the central/southern Plains into the Midwest and eastern U.S. The surface cold front, potential outflow and an MCV over the Mid-MS/OH Valley, and the upper trough/shortwave impulses will provide support for scattered strong to severe thunderstorms across portions of the Midwest into the Mid-Atlantic vicinity on Thursday. ...IA/MN/WI/northern IL Vicinity... A weak surface low will develop eastward across the Upper Midwest during the afternoon/early evening as the northern Plains upper trough shifts east. A cold front will extend into western MN into eastern NE by midday. Ahead of the front, a seasonally moist airmass will be in place with temperatures warming into the upper 70s to low 80s. Modestly steep midlevel lapse rates will further aid in weak to moderate destabilization during the afternoon (MLCAPE 1000-1500 J/kg). Vertical shear will be somewhat modest, around 25-35 kt, but will be sufficient for organized cells and a few transient supercells. Furthermore, elongated/straight forecast hodographs in combination with favorable instability parameters suggest isolated hail up to 1.75 inches diameter will be possible in addition to sporadic gusty thunderstorm winds. Given potential for severe hail, probabilities have been increased and a Slight risk (level 2 of 5) has been included for portions of the region. ...Central/Southern Plains to Mid-MS and Lower OH Valley Vicinity... Convection may be ongoing Thursday morning as a continuation from the Day 1/Wednesday period. This activity will likely result in outflow across the Ozarks and an MCV floating east across the Lower OH Valley. Vertical shear will remain weak over the OH Valley, and heating limited given early clouds and precip. However, a very moist airmass will result in weak to moderate destabilization in pockets of stronger heating. Thunderstorm clusters will pose a risk for sporadic strong gusts through the day as the convectively enhanced vorticity maxima migrates across the area. As the surface cold front advances east/southeast into northern OK and northwest MO by mid/late afternoon, additional thunderstorm development is expected across the recovering airmass over MO and along the strong differential heating gradient extending southward into OK. A very moist airmass will allow for moderate to strong destabilization amid 40+ kt effective shear magnitudes. Organized clusters/bands of storms will develop southeast ahead of the cold front, posing a risk for isolated to scattered strong/locally damaging gusts into the evening hours from eastern KS/OK into MO. Stronger cells may also pose an isolated risk for hail. More isolated, less-organized but still strong convection is expected with westward extent along the surface boundary across parts of western/central OK into the TX Panhandle. A few strong to severe gusts may accompany this activity. ...Mid-Atlantic Vicinity... Low-level warm advection and modest midlevel ascent will support isolated to scattered diurnal thunderstorms in a modestly unstable airmass. Vertical shear will be modest but sufficient for transient storm organization. High PW values, weak low-level flow and steep low-level lapse rates will support sporadic strong downbursts. ..Leitman.. 07/03/2024 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1210 PM CDT Wed Jul 03 2024 Valid 041200Z - 051200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF EASTERN KANSAS...NORTHEAST OKLAHOMA...AND THE OZARKS...AS WELL AS PARTS OF THE UPPER MISSISSIPPI VALLEY... ...SUMMARY... Severe thunderstorms will be possible on Independence Day, mainly across parts of the Upper Mississippi Valley, Ozarks, and south/central Plains. ...Synopsis... An upper trough over the northern/central Plains will deepen and develop a closed low as it shifts east into the Upper Midwest/Mid-MS Valley vicinity Thursday into Thursday night. Meanwhile, a convectively enhanced vorticity max/lead shortwave impulse in the vicinity of MO Thursday morning will develop eastward across the Ohio Valley and Mid-Atlantic. At the surface, a cold front will develop east/southeast across the central/southern Plains, and the Mid/Upper MS Valley vicinity. Ahead of the front, a seasonally moist airmass will be in place, with 60s to low 70s F dewpoints widespread from the central/southern Plains into the Midwest and eastern U.S. The surface cold front, potential outflow and an MCV over the Mid-MS/OH Valley, and the upper trough/shortwave impulses will provide support for scattered strong to severe thunderstorms across portions of the Midwest into the Mid-Atlantic vicinity on Thursday. ...IA/MN/WI/northern IL Vicinity... A weak surface low will develop eastward across the Upper Midwest during the afternoon/early evening as the northern Plains upper trough shifts east. A cold front will extend into western MN into eastern NE by midday. Ahead of the front, a seasonally moist airmass will be in place with temperatures warming into the upper 70s to low 80s. Modestly steep midlevel lapse rates will further aid in weak to moderate destabilization during the afternoon (MLCAPE 1000-1500 J/kg). Vertical shear will be somewhat modest, around 25-35 kt, but will be sufficient for organized cells and a few transient supercells. Furthermore, elongated/straight forecast hodographs in combination with favorable instability parameters suggest isolated hail up to 1.75 inches diameter will be possible in addition to sporadic gusty thunderstorm winds. Given potential for severe hail, probabilities have been increased and a Slight risk (level 2 of 5) has been included for portions of the region. ...Central/Southern Plains to Mid-MS and Lower OH Valley Vicinity... Convection may be ongoing Thursday morning as a continuation from the Day 1/Wednesday period. This activity will likely result in outflow across the Ozarks and an MCV floating east across the Lower OH Valley. Vertical shear will remain weak over the OH Valley, and heating limited given early clouds and precip. However, a very moist airmass will result in weak to moderate destabilization in pockets of stronger heating. Thunderstorm clusters will pose a risk for sporadic strong gusts through the day as the convectively enhanced vorticity maxima migrates across the area. As the surface cold front advances east/southeast into northern OK and northwest MO by mid/late afternoon, additional thunderstorm development is expected across the recovering airmass over MO and along the strong differential heating gradient extending southward into OK. A very moist airmass will allow for moderate to strong destabilization amid 40+ kt effective shear magnitudes. Organized clusters/bands of storms will develop southeast ahead of the cold front, posing a risk for isolated to scattered strong/locally damaging gusts into the evening hours from eastern KS/OK into MO. Stronger cells may also pose an isolated risk for hail. More isolated, less-organized but still strong convection is expected with westward extent along the surface boundary across parts of western/central OK into the TX Panhandle. A few strong to severe gusts may accompany this activity. ...Mid-Atlantic Vicinity... Low-level warm advection and modest midlevel ascent will support isolated to scattered diurnal thunderstorms in a modestly unstable airmass. Vertical shear will be modest but sufficient for transient storm organization. High PW values, weak low-level flow and steep low-level lapse rates will support sporadic strong downbursts. ..Leitman.. 07/03/2024 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1210 PM CDT Wed Jul 03 2024 Valid 041200Z - 051200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF EASTERN KANSAS...NORTHEAST OKLAHOMA...AND THE OZARKS...AS WELL AS PARTS OF THE UPPER MISSISSIPPI VALLEY... ...SUMMARY... Severe thunderstorms will be possible on Independence Day, mainly across parts of the Upper Mississippi Valley, Ozarks, and south/central Plains. ...Synopsis... An upper trough over the northern/central Plains will deepen and develop a closed low as it shifts east into the Upper Midwest/Mid-MS Valley vicinity Thursday into Thursday night. Meanwhile, a convectively enhanced vorticity max/lead shortwave impulse in the vicinity of MO Thursday morning will develop eastward across the Ohio Valley and Mid-Atlantic. At the surface, a cold front will develop east/southeast across the central/southern Plains, and the Mid/Upper MS Valley vicinity. Ahead of the front, a seasonally moist airmass will be in place, with 60s to low 70s F dewpoints widespread from the central/southern Plains into the Midwest and eastern U.S. The surface cold front, potential outflow and an MCV over the Mid-MS/OH Valley, and the upper trough/shortwave impulses will provide support for scattered strong to severe thunderstorms across portions of the Midwest into the Mid-Atlantic vicinity on Thursday. ...IA/MN/WI/northern IL Vicinity... A weak surface low will develop eastward across the Upper Midwest during the afternoon/early evening as the northern Plains upper trough shifts east. A cold front will extend into western MN into eastern NE by midday. Ahead of the front, a seasonally moist airmass will be in place with temperatures warming into the upper 70s to low 80s. Modestly steep midlevel lapse rates will further aid in weak to moderate destabilization during the afternoon (MLCAPE 1000-1500 J/kg). Vertical shear will be somewhat modest, around 25-35 kt, but will be sufficient for organized cells and a few transient supercells. Furthermore, elongated/straight forecast hodographs in combination with favorable instability parameters suggest isolated hail up to 1.75 inches diameter will be possible in addition to sporadic gusty thunderstorm winds. Given potential for severe hail, probabilities have been increased and a Slight risk (level 2 of 5) has been included for portions of the region. ...Central/Southern Plains to Mid-MS and Lower OH Valley Vicinity... Convection may be ongoing Thursday morning as a continuation from the Day 1/Wednesday period. This activity will likely result in outflow across the Ozarks and an MCV floating east across the Lower OH Valley. Vertical shear will remain weak over the OH Valley, and heating limited given early clouds and precip. However, a very moist airmass will result in weak to moderate destabilization in pockets of stronger heating. Thunderstorm clusters will pose a risk for sporadic strong gusts through the day as the convectively enhanced vorticity maxima migrates across the area. As the surface cold front advances east/southeast into northern OK and northwest MO by mid/late afternoon, additional thunderstorm development is expected across the recovering airmass over MO and along the strong differential heating gradient extending southward into OK. A very moist airmass will allow for moderate to strong destabilization amid 40+ kt effective shear magnitudes. Organized clusters/bands of storms will develop southeast ahead of the cold front, posing a risk for isolated to scattered strong/locally damaging gusts into the evening hours from eastern KS/OK into MO. Stronger cells may also pose an isolated risk for hail. More isolated, less-organized but still strong convection is expected with westward extent along the surface boundary across parts of western/central OK into the TX Panhandle. A few strong to severe gusts may accompany this activity. ...Mid-Atlantic Vicinity... Low-level warm advection and modest midlevel ascent will support isolated to scattered diurnal thunderstorms in a modestly unstable airmass. Vertical shear will be modest but sufficient for transient storm organization. High PW values, weak low-level flow and steep low-level lapse rates will support sporadic strong downbursts. ..Leitman.. 07/03/2024 Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1142 AM CDT Wed Jul 03 2024 Valid 031700Z - 041200Z ...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO... ...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH... ...17Z Update... Elevated highlights for the Sacramento Valley and much of the Great Basin into the Central Rockies have been maintained, with fire weather conditions in the Sacramento Valley expected to diminish by 21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada were removed from the Elevated highlight area due to increasing confidence that surface winds will remain below the 15 MPH criteria. However, locally elevated conditions are possible with surface conditions expected to be hot and dry. The Critical highlight over Southern Idaho has been maintained, with gusts of 25-30 MPH already observed this morning. Relative humidity is anticipated to drop below 15% during the afternoon with fuels that are modestly receptive to wildfire spread. A Critical area was introduced for much of East-Central Utah into the Upper Colorado River Basin. HREF guidance has increased confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels receptive to wildfire spread, particularly with southwestward extent. ..Halbert/Lyons.. 07/03/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/ ...Synopsis... A mid-level trough will overspread the northern Rockies while upper ridging prevails across much of the CONUS today. Adequate upper-support associated with the passing mid-level trough will encourage dry and windy conditions across portions of northern California and the northern Great Basin toward the central Rockies. Portions of the Sacramento Valley in California will be the first region impacted by fire weather conditions. 15+ mph sustained northerly surface winds should already be ongoing by the morning hours, with RH decreasing to 15 percent by late morning into early afternoon. Elevated highlights were added to parts of the Sacramento Valley given receptive fuels in the area. 15+ mph sustained westerly surface winds will also overlap with a large area of RH dropping below 15 percent across parts of the Great Basin into the central Rockies. Fuels are also receptive to wildfire spread in this region, warranting the maintenance of Elevated highlights. Critical highlights have also been maintained across portions of the Snake River Plain in southern Idaho, where westerly surface winds may sustain well above 20 mph for at least a few hours around afternoon peak heating. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1128 AM CDT Wed Jul 03 2024 Valid 031630Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE NORTHERN/CENTRAL PLAINS...AND THE OZARKS INTO PORTIONS OF THE OHIO VALLEY... ...SUMMARY... Scattered severe thunderstorms appear possible this afternoon and evening across parts of the northern/central High Plains, and from the Ozarks into the Ohio Valley. The most favorable corridor for isolated very large hail and significant severe wind gusts is centered on the central High Plains. ...Synopsis... An upper trough will continue moving eastward across Ontario and the Great Lakes today, while an upper high remains centered over the Southeast. Farther west, a separate mid-level shortwave trough will advance east-southeastward from the northern Rockies to the northern/central High Plains through tonight. Multiple convectively augmented mid-level vorticity maxima will move generally east-northeastward across the central Plains into the mid MS and OH Valleys. At the surface, a cold front extends from the OH Valley southwestward to the southern Plains. Weak lee cyclogenesis is forecast to occur across the central High Plains through late this afternoon, and modest low-level moisture return is anticipated to the north of the front and east of a weak surface lee trough across parts of the northern/central Plains. ...Northern/Central Plains... Morning clouds and lingering convection across parts of the central Plains will hamper the development of instability today, especially with eastward extent into NE/KS. Even so, pockets of filtered daytime heating will occur across the northern/central High Plains along and east of the surface lee trough. With steepened mid-level lapse rates present over eastern CO/WY into western SD/NE, a narrow zone of moderate instability is forecast to be in place prior to robust convective initiation this afternoon. Initial development should occur along the length of the lee trough from parts of western NE into eastern CO. A somewhat separate area of convection may also develop from northeastern WY to the Black Hills, as large-scale ascent preceding the mid-level shortwave trough overspreads this region. Modest low-level east-southeasterly flow will quickly veer to westerly at mid/upper levels, with some strengthening and hodograph elongation. Corresponding strong deep-layer shear will support supercells initially, with attendant threat for large hail. Given relatively cool temperatures aloft and the presence of steep mid-level lapse rates, isolated very large hail greater than 2 inches in diameter appears possible. A small zone with favorable overlap of moderate instability, strong deep-layer shear, and sufficient low-level shear remains apparent over parts of the NE Panhandle into northwest NE. This area may have a locally greater threat for a couple of tornadoes with any supercells that can persist late this afternoon into the early evening, assuming the boundary layer does not become too well mixed. Otherwise, upscale growth/clustering appears probable this evening as convective outflows aggregate into the central Plains. Severe/damaging winds should become the main threat as this occurs, with isolated significant gusts up to 75 mph possible if a more consolidated bow/MCS can develop. Confidence in this occurring still remains somewhat low, but the best chance for a more concentrated corridor of severe winds remains across parts of eastern CO into southwest NE and northwest KS this evening. ...Ozarks to the Ohio Valley... A rather moist low-level airmass remains present along/south of the front today, with surface dewpoints generally in the low to mid 70s, and precipitable water values around 1.75-2.2 inches. A fair amount of convective cloud debris is present along/near the front across the mid MS Valley. This will tend to slow diurnal destabilization to some extent across this area. Mid-level lapse rates are also expected to remain poor. Still, moderate to locally strong instability and steepened low-level lapse rates are forecast to develop through peak afternoon heating along/south of the front, which will extend from the Ozarks northeastward into parts of the OH Valley. Low-level winds are expected to remain generally weak, but a modest increase in southwesterly winds at mid levels should foster sufficient deep-layer shear to support some updraft organization. Mainly multicell clusters should develop this afternoon, focused along the front. Some of this activity may produce scattered damaging winds through early evening before eventually weakening. Morning guidance shows a greater concentration of thunderstorms with clustering potential across the Ozarks into the mid MS Valley. ..Gleason/Thornton.. 07/03/2024 Read more