Severe Storms

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1056 AM CDT Sat Apr 27 2024 Valid 271700Z - 281200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN HIGH PLAINS... The previous forecast remains on track, with some trimming of the fire weather highlights made where clouds and/or low-level moisture is expected to persist through the day. Clear skies are present behind the dryline, which is currently located over the eastern Texas Panhandle. RH is already dropping into the 15-25 percent range as the boundary layer mixes. With further daytime heating, surface RH should drop into the 10-20 percent range as westerly sustained surface winds approach 20+ mph, warranting the continuation of Critical highlights over portions of the southern High Plains. ..Squitieri.. 04/27/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Sat Apr 27 2024/ ...Synopsis... A strong mid-level jet streak will round the base of the western trough today, with strong lee cyclogenesis resulting across the High Plains. Strengthening flow amid very dry conditions will lead to Elevated to Critical fire weather concerns across portions of the southern High Plains into the central High Plains. ...Southern and Central High Plains... A deeply mixed air mass is expected to be in be in place by this afternoon across portions of eastern New Mexico into and eastward into the Oklahoma/Texas Panhandles into southwestern Kansas. In these regions, sustained surface winds 20-30 mph will overlap afternoon relative humidity reductions to around 5-10 percent. The Critical area was expanded further into southwestern Kansas, given recent trends. While some spotty Extremely Critical conditions are possible, fuels do not yet support inclusion of an Extremely Critical area at this time. ...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 1056 AM CDT Sat Apr 27 2024 Valid 271700Z - 281200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN HIGH PLAINS... The previous forecast remains on track, with some trimming of the fire weather highlights made where clouds and/or low-level moisture is expected to persist through the day. Clear skies are present behind the dryline, which is currently located over the eastern Texas Panhandle. RH is already dropping into the 15-25 percent range as the boundary layer mixes. With further daytime heating, surface RH should drop into the 10-20 percent range as westerly sustained surface winds approach 20+ mph, warranting the continuation of Critical highlights over portions of the southern High Plains. ..Squitieri.. 04/27/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Sat Apr 27 2024/ ...Synopsis... A strong mid-level jet streak will round the base of the western trough today, with strong lee cyclogenesis resulting across the High Plains. Strengthening flow amid very dry conditions will lead to Elevated to Critical fire weather concerns across portions of the southern High Plains into the central High Plains. ...Southern and Central High Plains... A deeply mixed air mass is expected to be in be in place by this afternoon across portions of eastern New Mexico into and eastward into the Oklahoma/Texas Panhandles into southwestern Kansas. In these regions, sustained surface winds 20-30 mph will overlap afternoon relative humidity reductions to around 5-10 percent. The Critical area was expanded further into southwestern Kansas, given recent trends. While some spotty Extremely Critical conditions are possible, fuels do not yet support inclusion of an Extremely Critical area at this time. ...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 1056 AM CDT Sat Apr 27 2024 Valid 271700Z - 281200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN HIGH PLAINS... The previous forecast remains on track, with some trimming of the fire weather highlights made where clouds and/or low-level moisture is expected to persist through the day. Clear skies are present behind the dryline, which is currently located over the eastern Texas Panhandle. RH is already dropping into the 15-25 percent range as the boundary layer mixes. With further daytime heating, surface RH should drop into the 10-20 percent range as westerly sustained surface winds approach 20+ mph, warranting the continuation of Critical highlights over portions of the southern High Plains. ..Squitieri.. 04/27/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Sat Apr 27 2024/ ...Synopsis... A strong mid-level jet streak will round the base of the western trough today, with strong lee cyclogenesis resulting across the High Plains. Strengthening flow amid very dry conditions will lead to Elevated to Critical fire weather concerns across portions of the southern High Plains into the central High Plains. ...Southern and Central High Plains... A deeply mixed air mass is expected to be in be in place by this afternoon across portions of eastern New Mexico into and eastward into the Oklahoma/Texas Panhandles into southwestern Kansas. In these regions, sustained surface winds 20-30 mph will overlap afternoon relative humidity reductions to around 5-10 percent. The Critical area was expanded further into southwestern Kansas, given recent trends. While some spotty Extremely Critical conditions are possible, fuels do not yet support inclusion of an Extremely Critical area at this time. ...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 1056 AM CDT Sat Apr 27 2024 Valid 271700Z - 281200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN HIGH PLAINS... The previous forecast remains on track, with some trimming of the fire weather highlights made where clouds and/or low-level moisture is expected to persist through the day. Clear skies are present behind the dryline, which is currently located over the eastern Texas Panhandle. RH is already dropping into the 15-25 percent range as the boundary layer mixes. With further daytime heating, surface RH should drop into the 10-20 percent range as westerly sustained surface winds approach 20+ mph, warranting the continuation of Critical highlights over portions of the southern High Plains. ..Squitieri.. 04/27/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Sat Apr 27 2024/ ...Synopsis... A strong mid-level jet streak will round the base of the western trough today, with strong lee cyclogenesis resulting across the High Plains. Strengthening flow amid very dry conditions will lead to Elevated to Critical fire weather concerns across portions of the southern High Plains into the central High Plains. ...Southern and Central High Plains... A deeply mixed air mass is expected to be in be in place by this afternoon across portions of eastern New Mexico into and eastward into the Oklahoma/Texas Panhandles into southwestern Kansas. In these regions, sustained surface winds 20-30 mph will overlap afternoon relative humidity reductions to around 5-10 percent. The Critical area was expanded further into southwestern Kansas, given recent trends. While some spotty Extremely Critical conditions are possible, fuels do not yet support inclusion of an Extremely Critical area at this time. ...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 1056 AM CDT Sat Apr 27 2024 Valid 271700Z - 281200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN HIGH PLAINS... The previous forecast remains on track, with some trimming of the fire weather highlights made where clouds and/or low-level moisture is expected to persist through the day. Clear skies are present behind the dryline, which is currently located over the eastern Texas Panhandle. RH is already dropping into the 15-25 percent range as the boundary layer mixes. With further daytime heating, surface RH should drop into the 10-20 percent range as westerly sustained surface winds approach 20+ mph, warranting the continuation of Critical highlights over portions of the southern High Plains. ..Squitieri.. 04/27/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Sat Apr 27 2024/ ...Synopsis... A strong mid-level jet streak will round the base of the western trough today, with strong lee cyclogenesis resulting across the High Plains. Strengthening flow amid very dry conditions will lead to Elevated to Critical fire weather concerns across portions of the southern High Plains into the central High Plains. ...Southern and Central High Plains... A deeply mixed air mass is expected to be in be in place by this afternoon across portions of eastern New Mexico into and eastward into the Oklahoma/Texas Panhandles into southwestern Kansas. In these regions, sustained surface winds 20-30 mph will overlap afternoon relative humidity reductions to around 5-10 percent. The Critical area was expanded further into southwestern Kansas, given recent trends. While some spotty Extremely Critical conditions are possible, fuels do not yet support inclusion of an Extremely Critical area at this time. ...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 1056 AM CDT Sat Apr 27 2024 Valid 271700Z - 281200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN HIGH PLAINS... The previous forecast remains on track, with some trimming of the fire weather highlights made where clouds and/or low-level moisture is expected to persist through the day. Clear skies are present behind the dryline, which is currently located over the eastern Texas Panhandle. RH is already dropping into the 15-25 percent range as the boundary layer mixes. With further daytime heating, surface RH should drop into the 10-20 percent range as westerly sustained surface winds approach 20+ mph, warranting the continuation of Critical highlights over portions of the southern High Plains. ..Squitieri.. 04/27/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Sat Apr 27 2024/ ...Synopsis... A strong mid-level jet streak will round the base of the western trough today, with strong lee cyclogenesis resulting across the High Plains. Strengthening flow amid very dry conditions will lead to Elevated to Critical fire weather concerns across portions of the southern High Plains into the central High Plains. ...Southern and Central High Plains... A deeply mixed air mass is expected to be in be in place by this afternoon across portions of eastern New Mexico into and eastward into the Oklahoma/Texas Panhandles into southwestern Kansas. In these regions, sustained surface winds 20-30 mph will overlap afternoon relative humidity reductions to around 5-10 percent. The Critical area was expanded further into southwestern Kansas, given recent trends. While some spotty Extremely Critical conditions are possible, fuels do not yet support inclusion of an Extremely Critical area at this time. ...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 1056 AM CDT Sat Apr 27 2024 Valid 271700Z - 281200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN HIGH PLAINS... The previous forecast remains on track, with some trimming of the fire weather highlights made where clouds and/or low-level moisture is expected to persist through the day. Clear skies are present behind the dryline, which is currently located over the eastern Texas Panhandle. RH is already dropping into the 15-25 percent range as the boundary layer mixes. With further daytime heating, surface RH should drop into the 10-20 percent range as westerly sustained surface winds approach 20+ mph, warranting the continuation of Critical highlights over portions of the southern High Plains. ..Squitieri.. 04/27/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Sat Apr 27 2024/ ...Synopsis... A strong mid-level jet streak will round the base of the western trough today, with strong lee cyclogenesis resulting across the High Plains. Strengthening flow amid very dry conditions will lead to Elevated to Critical fire weather concerns across portions of the southern High Plains into the central High Plains. ...Southern and Central High Plains... A deeply mixed air mass is expected to be in be in place by this afternoon across portions of eastern New Mexico into and eastward into the Oklahoma/Texas Panhandles into southwestern Kansas. In these regions, sustained surface winds 20-30 mph will overlap afternoon relative humidity reductions to around 5-10 percent. The Critical area was expanded further into southwestern Kansas, given recent trends. While some spotty Extremely Critical conditions are possible, fuels do not yet support inclusion of an Extremely Critical area at this time. ...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 1056 AM CDT Sat Apr 27 2024 Valid 271700Z - 281200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN HIGH PLAINS... The previous forecast remains on track, with some trimming of the fire weather highlights made where clouds and/or low-level moisture is expected to persist through the day. Clear skies are present behind the dryline, which is currently located over the eastern Texas Panhandle. RH is already dropping into the 15-25 percent range as the boundary layer mixes. With further daytime heating, surface RH should drop into the 10-20 percent range as westerly sustained surface winds approach 20+ mph, warranting the continuation of Critical highlights over portions of the southern High Plains. ..Squitieri.. 04/27/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Sat Apr 27 2024/ ...Synopsis... A strong mid-level jet streak will round the base of the western trough today, with strong lee cyclogenesis resulting across the High Plains. Strengthening flow amid very dry conditions will lead to Elevated to Critical fire weather concerns across portions of the southern High Plains into the central High Plains. ...Southern and Central High Plains... A deeply mixed air mass is expected to be in be in place by this afternoon across portions of eastern New Mexico into and eastward into the Oklahoma/Texas Panhandles into southwestern Kansas. In these regions, sustained surface winds 20-30 mph will overlap afternoon relative humidity reductions to around 5-10 percent. The Critical area was expanded further into southwestern Kansas, given recent trends. While some spotty Extremely Critical conditions are possible, fuels do not yet support inclusion of an Extremely Critical area at this time. ...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 1056 AM CDT Sat Apr 27 2024 Valid 271700Z - 281200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN HIGH PLAINS... The previous forecast remains on track, with some trimming of the fire weather highlights made where clouds and/or low-level moisture is expected to persist through the day. Clear skies are present behind the dryline, which is currently located over the eastern Texas Panhandle. RH is already dropping into the 15-25 percent range as the boundary layer mixes. With further daytime heating, surface RH should drop into the 10-20 percent range as westerly sustained surface winds approach 20+ mph, warranting the continuation of Critical highlights over portions of the southern High Plains. ..Squitieri.. 04/27/2024 .PREV DISCUSSION... /ISSUED 0158 AM CDT Sat Apr 27 2024/ ...Synopsis... A strong mid-level jet streak will round the base of the western trough today, with strong lee cyclogenesis resulting across the High Plains. Strengthening flow amid very dry conditions will lead to Elevated to Critical fire weather concerns across portions of the southern High Plains into the central High Plains. ...Southern and Central High Plains... A deeply mixed air mass is expected to be in be in place by this afternoon across portions of eastern New Mexico into and eastward into the Oklahoma/Texas Panhandles into southwestern Kansas. In these regions, sustained surface winds 20-30 mph will overlap afternoon relative humidity reductions to around 5-10 percent. The Critical area was expanded further into southwestern Kansas, given recent trends. While some spotty Extremely Critical conditions are possible, fuels do not yet support inclusion of an Extremely Critical area at this time. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

WW 0144 Status Updates
STATUS REPORT ON WW 144 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 0538. ..GRAMS..04/27/24 ATTN...WFO...OUN...LUB...AMA... STATUS REPORT FOR WT 144 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS OKC003-009-011-039-043-045-047-053-055-057-059-065-075-093-129- 141-149-151-153-271640- OK . OKLAHOMA COUNTIES INCLUDED ARE ALFALFA BECKHAM BLAINE CUSTER DEWEY ELLIS GARFIELD GRANT GREER HARMON HARPER JACKSON KIOWA MAJOR ROGER MILLS TILLMAN WASHITA WOODS WOODWARD TXC075-087-101-155-191-197-345-483-487-271640- TX . TEXAS COUNTIES INCLUDED ARE CHILDRESS COLLINGSWORTH COTTLE FOARD HALL HARDEMAN MOTLEY WHEELER WILBARGER Read more

MD 0538 CONCERNING TORNADO WATCH 144... FOR WESTERN OK AND THE SOUTHEAST TX PANHANDLE
Mesoscale Discussion 0538 NWS Storm Prediction Center Norman OK 0924 AM CDT Sat Apr 27 2024 Areas affected...Western OK and the southeast TX Panhandle Concerning...Tornado Watch 144... Valid 271424Z - 271600Z The severe weather threat for Tornado Watch 144 continues. SUMMARY...Severe storm threat will increase through midday across the southeast Texas Panhandle into west-central and southwest Oklahoma. DISCUSSION...Convection along and ahead of the dryline across the southeast TX Panhandle into west-central OK has thus far largely struggled to turn the corner and produce severe weather yet this morning amid several candidate updrafts. Insolation ahead of this activity is greatest in western north TX from the CDS vicinity southward. It is plausible that sustained supercell development may evolve from the Hale County storm as it tracks along the 67 F isodrosotherm into southwest OK, as weak MLCIN noted in 12Z soundings erodes. Large hail will the primary initial threat with tornado potential increasing into early afternoon amid a 40-45 kt southerly low-level jet per FDR VWP data. ..Grams.. 04/27/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OUN...LUB...AMA... LAT...LON 35710004 36269888 36439817 36349779 35989764 35459787 35219829 34959873 34439941 33880036 33920093 34500086 35710004 Read more

WW 0144 Status Updates
STATUS REPORT ON WW 144 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 0538 ..GRAMS..04/27/24 ATTN...WFO...OUN...LUB...AMA... STATUS REPORT FOR WT 144 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS OKC003-009-011-039-043-045-047-053-055-057-059-065-075-093-129- 141-149-151-153-271540- OK . OKLAHOMA COUNTIES INCLUDED ARE ALFALFA BECKHAM BLAINE CUSTER DEWEY ELLIS GARFIELD GRANT GREER HARMON HARPER JACKSON KIOWA MAJOR ROGER MILLS TILLMAN WASHITA WOODS WOODWARD TXC075-087-101-155-191-197-345-483-487-271540- TX . TEXAS COUNTIES INCLUDED ARE CHILDRESS COLLINGSWORTH COTTLE FOARD HALL HARDEMAN MOTLEY WHEELER WILBARGER Read more

No Mesoscale Discussions are in effect as of Sat Apr 27 14:00:05 UTC 2024.

WW 0144 Status Updates
STATUS REPORT ON WW 144 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..GRAMS..04/27/24 ATTN...WFO...OUN...LUB...AMA... STATUS REPORT FOR WT 144 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS OKC003-009-011-039-043-045-047-053-055-057-059-065-075-093-129- 141-149-151-153-271440- OK . OKLAHOMA COUNTIES INCLUDED ARE ALFALFA BECKHAM BLAINE CUSTER DEWEY ELLIS GARFIELD GRANT GREER HARMON HARPER JACKSON KIOWA MAJOR ROGER MILLS TILLMAN WASHITA WOODS WOODWARD TXC075-087-101-155-191-197-345-483-487-271440- TX . TEXAS COUNTIES INCLUDED ARE CHILDRESS COLLINGSWORTH COTTLE FOARD HALL HARDEMAN MOTLEY WHEELER WILBARGER THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0756 AM CDT Sat Apr 27 2024 Valid 271300Z - 281200Z ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT FOR OK...NORTH TX...SOUTHEAST KS AND EXTREME SOUTHWEST MO... ...SUMMARY... Severe thunderstorms are likely today and tonight across the southern and central Plains into the lower to mid Missouri Valley. The most numerous/intense storms are expected from north Texas into Oklahoma and southeast Kansas, where strong tornadoes, very large hail of 2-3 inches in diameter and damaging winds of 60-70 mph are all possible. ...A regional severe-weather outbreak is expected from north TX across OK into KS with strong tornadoes, very large hail and damaging winds all part of a long-duration threat... ...OK/KS/north TX through tonight... A pronounced midlevel trough over the Four Corners will move eastward today and then begin to eject northeastward tonight over the central/southern High Plains. This synoptic pattern will maintain a lee cyclone in southeast CO and a dryline arcing southeastward and then southward close to the western OK border. Farther north, a stalling baroclinic zone will move slowly northward into northern KS today and central IA by this evening. A broad, unstable warm sector with boundary-layer dewpoints of 65-70 F will support multiple rounds of severe/tornadic storms through the period, both along the synoptic boundaries and in parts of the open warm sector for OK/KS. The initial severe/tornado threat has already begun near Caprock from Lubbock to Childress as an embedded jet streak (evident as the fast-moving cloud streak over west TX) begins to interact with the northwest edge of the richer low-level moisture. Despite the unusually early start, there will be the potential for embedded supercells capable of all hazards as the storms overspread western/northern OK into southern KS through midday. An outflow boundary and/or differential heating corridor is likely in the immediate wake of these morning storms from southern KS into north central and southwest OK. Additional thunderstorm development is likely by early-mid afternoon along this zone and the dryline to the south into TX, and storms will spread generally northeastward toward southern/central OK and southeast KS. A moist boundary layer, MLCAPE of 2500-3500 J/kg and lengthening/enlarging hodographs with time (as a mass response to the approaching shortwave trough) will become more favorable for tornadic supercells, including the potential for long-track EF2-EF3+ tornadoes. The significant tornado threat will be greatest if semi-discrete supercells can be maintained well into the afternoon/evening. Very large hail up to 3 inches in diameter can also be expected with the more intense supercells. The storm evolution has the potential to be a bit messy with multiple training/conjoined supercells, posing a relatively long-duration and repeat threat to areas within the training storm corridors across the central third of OK. Damaging winds will become more probable with storm clustering, and there will likely be upscale growth into a larger QLCS this evening into tonight as the primary shortwave trough approaches from the west. The potential for tornadoes with embedded circulation will continue into the overnight hours, along with damaging winds. ...East central CO/far western KS this afternoon/evening... Near the lee cyclone and a stalled front, thunderstorm development is expected by early afternoon in a small cluster/arc across east central CO. Despite boundary-layer dewpoints only in the 40s, cold midlevel temperatures and steep lapse rates will contribute to surface-based CAPE up to 1000 J/kg. Relatively large, curved hodographs will favor supercells capable of producing a few tornadoes and large hail, as well as damaging gusts once any upscale growth into a line segment occurs. ...Northern IL/southeast WI/Lower MI this afternoon/evening... A midlevel trough and associated surface cyclone will move northeastward today from the upper MS Valley to the upper Great Lakes. The stronger forcing for ascent has already moved northeast of the surface warm sector, so storm development in this corridor will likely be later this afternoon/evening in association with low-level ascent along the stalling front across WI/lower MI. A band of storms is expected along the front, and other convection could eventually spread into northern IL from eastern IA. Forecast profiles along and south of the front show sufficient hodograph length/deep-layer shear for organized line segments and some embedded supercells capable of producing damaging gusts and possibly a tornado or two. Isolated large hail will also be possible, given some potential for embedded supercells within the northeast extent of the 7-8 C/km midlevel lapse rates. ..Thompson/Hart.. 04/27/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0756 AM CDT Sat Apr 27 2024 Valid 271300Z - 281200Z ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT FOR OK...NORTH TX...SOUTHEAST KS AND EXTREME SOUTHWEST MO... ...SUMMARY... Severe thunderstorms are likely today and tonight across the southern and central Plains into the lower to mid Missouri Valley. The most numerous/intense storms are expected from north Texas into Oklahoma and southeast Kansas, where strong tornadoes, very large hail of 2-3 inches in diameter and damaging winds of 60-70 mph are all possible. ...A regional severe-weather outbreak is expected from north TX across OK into KS with strong tornadoes, very large hail and damaging winds all part of a long-duration threat... ...OK/KS/north TX through tonight... A pronounced midlevel trough over the Four Corners will move eastward today and then begin to eject northeastward tonight over the central/southern High Plains. This synoptic pattern will maintain a lee cyclone in southeast CO and a dryline arcing southeastward and then southward close to the western OK border. Farther north, a stalling baroclinic zone will move slowly northward into northern KS today and central IA by this evening. A broad, unstable warm sector with boundary-layer dewpoints of 65-70 F will support multiple rounds of severe/tornadic storms through the period, both along the synoptic boundaries and in parts of the open warm sector for OK/KS. The initial severe/tornado threat has already begun near Caprock from Lubbock to Childress as an embedded jet streak (evident as the fast-moving cloud streak over west TX) begins to interact with the northwest edge of the richer low-level moisture. Despite the unusually early start, there will be the potential for embedded supercells capable of all hazards as the storms overspread western/northern OK into southern KS through midday. An outflow boundary and/or differential heating corridor is likely in the immediate wake of these morning storms from southern KS into north central and southwest OK. Additional thunderstorm development is likely by early-mid afternoon along this zone and the dryline to the south into TX, and storms will spread generally northeastward toward southern/central OK and southeast KS. A moist boundary layer, MLCAPE of 2500-3500 J/kg and lengthening/enlarging hodographs with time (as a mass response to the approaching shortwave trough) will become more favorable for tornadic supercells, including the potential for long-track EF2-EF3+ tornadoes. The significant tornado threat will be greatest if semi-discrete supercells can be maintained well into the afternoon/evening. Very large hail up to 3 inches in diameter can also be expected with the more intense supercells. The storm evolution has the potential to be a bit messy with multiple training/conjoined supercells, posing a relatively long-duration and repeat threat to areas within the training storm corridors across the central third of OK. Damaging winds will become more probable with storm clustering, and there will likely be upscale growth into a larger QLCS this evening into tonight as the primary shortwave trough approaches from the west. The potential for tornadoes with embedded circulation will continue into the overnight hours, along with damaging winds. ...East central CO/far western KS this afternoon/evening... Near the lee cyclone and a stalled front, thunderstorm development is expected by early afternoon in a small cluster/arc across east central CO. Despite boundary-layer dewpoints only in the 40s, cold midlevel temperatures and steep lapse rates will contribute to surface-based CAPE up to 1000 J/kg. Relatively large, curved hodographs will favor supercells capable of producing a few tornadoes and large hail, as well as damaging gusts once any upscale growth into a line segment occurs. ...Northern IL/southeast WI/Lower MI this afternoon/evening... A midlevel trough and associated surface cyclone will move northeastward today from the upper MS Valley to the upper Great Lakes. The stronger forcing for ascent has already moved northeast of the surface warm sector, so storm development in this corridor will likely be later this afternoon/evening in association with low-level ascent along the stalling front across WI/lower MI. A band of storms is expected along the front, and other convection could eventually spread into northern IL from eastern IA. Forecast profiles along and south of the front show sufficient hodograph length/deep-layer shear for organized line segments and some embedded supercells capable of producing damaging gusts and possibly a tornado or two. Isolated large hail will also be possible, given some potential for embedded supercells within the northeast extent of the 7-8 C/km midlevel lapse rates. ..Thompson/Hart.. 04/27/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0756 AM CDT Sat Apr 27 2024 Valid 271300Z - 281200Z ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT FOR OK...NORTH TX...SOUTHEAST KS AND EXTREME SOUTHWEST MO... ...SUMMARY... Severe thunderstorms are likely today and tonight across the southern and central Plains into the lower to mid Missouri Valley. The most numerous/intense storms are expected from north Texas into Oklahoma and southeast Kansas, where strong tornadoes, very large hail of 2-3 inches in diameter and damaging winds of 60-70 mph are all possible. ...A regional severe-weather outbreak is expected from north TX across OK into KS with strong tornadoes, very large hail and damaging winds all part of a long-duration threat... ...OK/KS/north TX through tonight... A pronounced midlevel trough over the Four Corners will move eastward today and then begin to eject northeastward tonight over the central/southern High Plains. This synoptic pattern will maintain a lee cyclone in southeast CO and a dryline arcing southeastward and then southward close to the western OK border. Farther north, a stalling baroclinic zone will move slowly northward into northern KS today and central IA by this evening. A broad, unstable warm sector with boundary-layer dewpoints of 65-70 F will support multiple rounds of severe/tornadic storms through the period, both along the synoptic boundaries and in parts of the open warm sector for OK/KS. The initial severe/tornado threat has already begun near Caprock from Lubbock to Childress as an embedded jet streak (evident as the fast-moving cloud streak over west TX) begins to interact with the northwest edge of the richer low-level moisture. Despite the unusually early start, there will be the potential for embedded supercells capable of all hazards as the storms overspread western/northern OK into southern KS through midday. An outflow boundary and/or differential heating corridor is likely in the immediate wake of these morning storms from southern KS into north central and southwest OK. Additional thunderstorm development is likely by early-mid afternoon along this zone and the dryline to the south into TX, and storms will spread generally northeastward toward southern/central OK and southeast KS. A moist boundary layer, MLCAPE of 2500-3500 J/kg and lengthening/enlarging hodographs with time (as a mass response to the approaching shortwave trough) will become more favorable for tornadic supercells, including the potential for long-track EF2-EF3+ tornadoes. The significant tornado threat will be greatest if semi-discrete supercells can be maintained well into the afternoon/evening. Very large hail up to 3 inches in diameter can also be expected with the more intense supercells. The storm evolution has the potential to be a bit messy with multiple training/conjoined supercells, posing a relatively long-duration and repeat threat to areas within the training storm corridors across the central third of OK. Damaging winds will become more probable with storm clustering, and there will likely be upscale growth into a larger QLCS this evening into tonight as the primary shortwave trough approaches from the west. The potential for tornadoes with embedded circulation will continue into the overnight hours, along with damaging winds. ...East central CO/far western KS this afternoon/evening... Near the lee cyclone and a stalled front, thunderstorm development is expected by early afternoon in a small cluster/arc across east central CO. Despite boundary-layer dewpoints only in the 40s, cold midlevel temperatures and steep lapse rates will contribute to surface-based CAPE up to 1000 J/kg. Relatively large, curved hodographs will favor supercells capable of producing a few tornadoes and large hail, as well as damaging gusts once any upscale growth into a line segment occurs. ...Northern IL/southeast WI/Lower MI this afternoon/evening... A midlevel trough and associated surface cyclone will move northeastward today from the upper MS Valley to the upper Great Lakes. The stronger forcing for ascent has already moved northeast of the surface warm sector, so storm development in this corridor will likely be later this afternoon/evening in association with low-level ascent along the stalling front across WI/lower MI. A band of storms is expected along the front, and other convection could eventually spread into northern IL from eastern IA. Forecast profiles along and south of the front show sufficient hodograph length/deep-layer shear for organized line segments and some embedded supercells capable of producing damaging gusts and possibly a tornado or two. Isolated large hail will also be possible, given some potential for embedded supercells within the northeast extent of the 7-8 C/km midlevel lapse rates. ..Thompson/Hart.. 04/27/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0756 AM CDT Sat Apr 27 2024 Valid 271300Z - 281200Z ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT FOR OK...NORTH TX...SOUTHEAST KS AND EXTREME SOUTHWEST MO... ...SUMMARY... Severe thunderstorms are likely today and tonight across the southern and central Plains into the lower to mid Missouri Valley. The most numerous/intense storms are expected from north Texas into Oklahoma and southeast Kansas, where strong tornadoes, very large hail of 2-3 inches in diameter and damaging winds of 60-70 mph are all possible. ...A regional severe-weather outbreak is expected from north TX across OK into KS with strong tornadoes, very large hail and damaging winds all part of a long-duration threat... ...OK/KS/north TX through tonight... A pronounced midlevel trough over the Four Corners will move eastward today and then begin to eject northeastward tonight over the central/southern High Plains. This synoptic pattern will maintain a lee cyclone in southeast CO and a dryline arcing southeastward and then southward close to the western OK border. Farther north, a stalling baroclinic zone will move slowly northward into northern KS today and central IA by this evening. A broad, unstable warm sector with boundary-layer dewpoints of 65-70 F will support multiple rounds of severe/tornadic storms through the period, both along the synoptic boundaries and in parts of the open warm sector for OK/KS. The initial severe/tornado threat has already begun near Caprock from Lubbock to Childress as an embedded jet streak (evident as the fast-moving cloud streak over west TX) begins to interact with the northwest edge of the richer low-level moisture. Despite the unusually early start, there will be the potential for embedded supercells capable of all hazards as the storms overspread western/northern OK into southern KS through midday. An outflow boundary and/or differential heating corridor is likely in the immediate wake of these morning storms from southern KS into north central and southwest OK. Additional thunderstorm development is likely by early-mid afternoon along this zone and the dryline to the south into TX, and storms will spread generally northeastward toward southern/central OK and southeast KS. A moist boundary layer, MLCAPE of 2500-3500 J/kg and lengthening/enlarging hodographs with time (as a mass response to the approaching shortwave trough) will become more favorable for tornadic supercells, including the potential for long-track EF2-EF3+ tornadoes. The significant tornado threat will be greatest if semi-discrete supercells can be maintained well into the afternoon/evening. Very large hail up to 3 inches in diameter can also be expected with the more intense supercells. The storm evolution has the potential to be a bit messy with multiple training/conjoined supercells, posing a relatively long-duration and repeat threat to areas within the training storm corridors across the central third of OK. Damaging winds will become more probable with storm clustering, and there will likely be upscale growth into a larger QLCS this evening into tonight as the primary shortwave trough approaches from the west. The potential for tornadoes with embedded circulation will continue into the overnight hours, along with damaging winds. ...East central CO/far western KS this afternoon/evening... Near the lee cyclone and a stalled front, thunderstorm development is expected by early afternoon in a small cluster/arc across east central CO. Despite boundary-layer dewpoints only in the 40s, cold midlevel temperatures and steep lapse rates will contribute to surface-based CAPE up to 1000 J/kg. Relatively large, curved hodographs will favor supercells capable of producing a few tornadoes and large hail, as well as damaging gusts once any upscale growth into a line segment occurs. ...Northern IL/southeast WI/Lower MI this afternoon/evening... A midlevel trough and associated surface cyclone will move northeastward today from the upper MS Valley to the upper Great Lakes. The stronger forcing for ascent has already moved northeast of the surface warm sector, so storm development in this corridor will likely be later this afternoon/evening in association with low-level ascent along the stalling front across WI/lower MI. A band of storms is expected along the front, and other convection could eventually spread into northern IL from eastern IA. Forecast profiles along and south of the front show sufficient hodograph length/deep-layer shear for organized line segments and some embedded supercells capable of producing damaging gusts and possibly a tornado or two. Isolated large hail will also be possible, given some potential for embedded supercells within the northeast extent of the 7-8 C/km midlevel lapse rates. ..Thompson/Hart.. 04/27/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0756 AM CDT Sat Apr 27 2024 Valid 271300Z - 281200Z ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT FOR OK...NORTH TX...SOUTHEAST KS AND EXTREME SOUTHWEST MO... ...SUMMARY... Severe thunderstorms are likely today and tonight across the southern and central Plains into the lower to mid Missouri Valley. The most numerous/intense storms are expected from north Texas into Oklahoma and southeast Kansas, where strong tornadoes, very large hail of 2-3 inches in diameter and damaging winds of 60-70 mph are all possible. ...A regional severe-weather outbreak is expected from north TX across OK into KS with strong tornadoes, very large hail and damaging winds all part of a long-duration threat... ...OK/KS/north TX through tonight... A pronounced midlevel trough over the Four Corners will move eastward today and then begin to eject northeastward tonight over the central/southern High Plains. This synoptic pattern will maintain a lee cyclone in southeast CO and a dryline arcing southeastward and then southward close to the western OK border. Farther north, a stalling baroclinic zone will move slowly northward into northern KS today and central IA by this evening. A broad, unstable warm sector with boundary-layer dewpoints of 65-70 F will support multiple rounds of severe/tornadic storms through the period, both along the synoptic boundaries and in parts of the open warm sector for OK/KS. The initial severe/tornado threat has already begun near Caprock from Lubbock to Childress as an embedded jet streak (evident as the fast-moving cloud streak over west TX) begins to interact with the northwest edge of the richer low-level moisture. Despite the unusually early start, there will be the potential for embedded supercells capable of all hazards as the storms overspread western/northern OK into southern KS through midday. An outflow boundary and/or differential heating corridor is likely in the immediate wake of these morning storms from southern KS into north central and southwest OK. Additional thunderstorm development is likely by early-mid afternoon along this zone and the dryline to the south into TX, and storms will spread generally northeastward toward southern/central OK and southeast KS. A moist boundary layer, MLCAPE of 2500-3500 J/kg and lengthening/enlarging hodographs with time (as a mass response to the approaching shortwave trough) will become more favorable for tornadic supercells, including the potential for long-track EF2-EF3+ tornadoes. The significant tornado threat will be greatest if semi-discrete supercells can be maintained well into the afternoon/evening. Very large hail up to 3 inches in diameter can also be expected with the more intense supercells. The storm evolution has the potential to be a bit messy with multiple training/conjoined supercells, posing a relatively long-duration and repeat threat to areas within the training storm corridors across the central third of OK. Damaging winds will become more probable with storm clustering, and there will likely be upscale growth into a larger QLCS this evening into tonight as the primary shortwave trough approaches from the west. The potential for tornadoes with embedded circulation will continue into the overnight hours, along with damaging winds. ...East central CO/far western KS this afternoon/evening... Near the lee cyclone and a stalled front, thunderstorm development is expected by early afternoon in a small cluster/arc across east central CO. Despite boundary-layer dewpoints only in the 40s, cold midlevel temperatures and steep lapse rates will contribute to surface-based CAPE up to 1000 J/kg. Relatively large, curved hodographs will favor supercells capable of producing a few tornadoes and large hail, as well as damaging gusts once any upscale growth into a line segment occurs. ...Northern IL/southeast WI/Lower MI this afternoon/evening... A midlevel trough and associated surface cyclone will move northeastward today from the upper MS Valley to the upper Great Lakes. The stronger forcing for ascent has already moved northeast of the surface warm sector, so storm development in this corridor will likely be later this afternoon/evening in association with low-level ascent along the stalling front across WI/lower MI. A band of storms is expected along the front, and other convection could eventually spread into northern IL from eastern IA. Forecast profiles along and south of the front show sufficient hodograph length/deep-layer shear for organized line segments and some embedded supercells capable of producing damaging gusts and possibly a tornado or two. Isolated large hail will also be possible, given some potential for embedded supercells within the northeast extent of the 7-8 C/km midlevel lapse rates. ..Thompson/Hart.. 04/27/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0756 AM CDT Sat Apr 27 2024 Valid 271300Z - 281200Z ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT FOR OK...NORTH TX...SOUTHEAST KS AND EXTREME SOUTHWEST MO... ...SUMMARY... Severe thunderstorms are likely today and tonight across the southern and central Plains into the lower to mid Missouri Valley. The most numerous/intense storms are expected from north Texas into Oklahoma and southeast Kansas, where strong tornadoes, very large hail of 2-3 inches in diameter and damaging winds of 60-70 mph are all possible. ...A regional severe-weather outbreak is expected from north TX across OK into KS with strong tornadoes, very large hail and damaging winds all part of a long-duration threat... ...OK/KS/north TX through tonight... A pronounced midlevel trough over the Four Corners will move eastward today and then begin to eject northeastward tonight over the central/southern High Plains. This synoptic pattern will maintain a lee cyclone in southeast CO and a dryline arcing southeastward and then southward close to the western OK border. Farther north, a stalling baroclinic zone will move slowly northward into northern KS today and central IA by this evening. A broad, unstable warm sector with boundary-layer dewpoints of 65-70 F will support multiple rounds of severe/tornadic storms through the period, both along the synoptic boundaries and in parts of the open warm sector for OK/KS. The initial severe/tornado threat has already begun near Caprock from Lubbock to Childress as an embedded jet streak (evident as the fast-moving cloud streak over west TX) begins to interact with the northwest edge of the richer low-level moisture. Despite the unusually early start, there will be the potential for embedded supercells capable of all hazards as the storms overspread western/northern OK into southern KS through midday. An outflow boundary and/or differential heating corridor is likely in the immediate wake of these morning storms from southern KS into north central and southwest OK. Additional thunderstorm development is likely by early-mid afternoon along this zone and the dryline to the south into TX, and storms will spread generally northeastward toward southern/central OK and southeast KS. A moist boundary layer, MLCAPE of 2500-3500 J/kg and lengthening/enlarging hodographs with time (as a mass response to the approaching shortwave trough) will become more favorable for tornadic supercells, including the potential for long-track EF2-EF3+ tornadoes. The significant tornado threat will be greatest if semi-discrete supercells can be maintained well into the afternoon/evening. Very large hail up to 3 inches in diameter can also be expected with the more intense supercells. The storm evolution has the potential to be a bit messy with multiple training/conjoined supercells, posing a relatively long-duration and repeat threat to areas within the training storm corridors across the central third of OK. Damaging winds will become more probable with storm clustering, and there will likely be upscale growth into a larger QLCS this evening into tonight as the primary shortwave trough approaches from the west. The potential for tornadoes with embedded circulation will continue into the overnight hours, along with damaging winds. ...East central CO/far western KS this afternoon/evening... Near the lee cyclone and a stalled front, thunderstorm development is expected by early afternoon in a small cluster/arc across east central CO. Despite boundary-layer dewpoints only in the 40s, cold midlevel temperatures and steep lapse rates will contribute to surface-based CAPE up to 1000 J/kg. Relatively large, curved hodographs will favor supercells capable of producing a few tornadoes and large hail, as well as damaging gusts once any upscale growth into a line segment occurs. ...Northern IL/southeast WI/Lower MI this afternoon/evening... A midlevel trough and associated surface cyclone will move northeastward today from the upper MS Valley to the upper Great Lakes. The stronger forcing for ascent has already moved northeast of the surface warm sector, so storm development in this corridor will likely be later this afternoon/evening in association with low-level ascent along the stalling front across WI/lower MI. A band of storms is expected along the front, and other convection could eventually spread into northern IL from eastern IA. Forecast profiles along and south of the front show sufficient hodograph length/deep-layer shear for organized line segments and some embedded supercells capable of producing damaging gusts and possibly a tornado or two. Isolated large hail will also be possible, given some potential for embedded supercells within the northeast extent of the 7-8 C/km midlevel lapse rates. ..Thompson/Hart.. 04/27/2024 Read more