Severe Storms

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0157 AM CDT Sat Aug 23 2025 Valid 241200Z - 251200Z ...Synopsis... Along the northwestern periphery of an amplified large-scale ridge extending from the Southwest to the Pacific Northwest, monsoonal moisture will continue spreading northward from the Great Basin into northern CA and OR. This will contribute to sufficient buoyancy for diurnally driven thunderstorms during the afternoon into the evening -- likely aided by a convectively augmented/generated midlevel vorticity maximum/MCV emerging from the northern Sierra. A mix of wet/dry thunderstorms are expected, and given receptive fuels across the region, lightning-induced ignitions will be possible away from any heavier precipitation cores that evolve. ..Weinman.. 08/23/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0157 AM CDT Sat Aug 23 2025 Valid 241200Z - 251200Z ...Synopsis... Along the northwestern periphery of an amplified large-scale ridge extending from the Southwest to the Pacific Northwest, monsoonal moisture will continue spreading northward from the Great Basin into northern CA and OR. This will contribute to sufficient buoyancy for diurnally driven thunderstorms during the afternoon into the evening -- likely aided by a convectively augmented/generated midlevel vorticity maximum/MCV emerging from the northern Sierra. A mix of wet/dry thunderstorms are expected, and given receptive fuels across the region, lightning-induced ignitions will be possible away from any heavier precipitation cores that evolve. ..Weinman.. 08/23/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0157 AM CDT Sat Aug 23 2025 Valid 241200Z - 251200Z ...Synopsis... Along the northwestern periphery of an amplified large-scale ridge extending from the Southwest to the Pacific Northwest, monsoonal moisture will continue spreading northward from the Great Basin into northern CA and OR. This will contribute to sufficient buoyancy for diurnally driven thunderstorms during the afternoon into the evening -- likely aided by a convectively augmented/generated midlevel vorticity maximum/MCV emerging from the northern Sierra. A mix of wet/dry thunderstorms are expected, and given receptive fuels across the region, lightning-induced ignitions will be possible away from any heavier precipitation cores that evolve. ..Weinman.. 08/23/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0157 AM CDT Sat Aug 23 2025 Valid 241200Z - 251200Z ...Synopsis... Along the northwestern periphery of an amplified large-scale ridge extending from the Southwest to the Pacific Northwest, monsoonal moisture will continue spreading northward from the Great Basin into northern CA and OR. This will contribute to sufficient buoyancy for diurnally driven thunderstorms during the afternoon into the evening -- likely aided by a convectively augmented/generated midlevel vorticity maximum/MCV emerging from the northern Sierra. A mix of wet/dry thunderstorms are expected, and given receptive fuels across the region, lightning-induced ignitions will be possible away from any heavier precipitation cores that evolve. ..Weinman.. 08/23/2025 ...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 0156 AM CDT Sat Aug 23 2025 Valid 231200Z - 241200Z ...Synopsis... An expansive midlevel high will remain in place over the Four Corners vicinity, while deepening monsoonal moisture continues spreading northward across the Great Basin into the Northwest. Along the western periphery of the midlevel high, an unseasonably hot/unstable air mass will persist across much of CA into the Great Basin, where another day of diurnally driven showers and thunderstorms are expected. While the gradually deepening monsoonal moisture will favor a mix of wet/dry thunderstorms, a dry/deeply mixed sub-cloud layer will tend to limit precipitation accumulations over many areas. As a result, isolated lightning-induced ignitions will be possible over dry fuels, along with gusty/erratic outflow winds. ..Weinman.. 08/23/2025 ...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 0156 AM CDT Sat Aug 23 2025 Valid 231200Z - 241200Z ...Synopsis... An expansive midlevel high will remain in place over the Four Corners vicinity, while deepening monsoonal moisture continues spreading northward across the Great Basin into the Northwest. Along the western periphery of the midlevel high, an unseasonably hot/unstable air mass will persist across much of CA into the Great Basin, where another day of diurnally driven showers and thunderstorms are expected. While the gradually deepening monsoonal moisture will favor a mix of wet/dry thunderstorms, a dry/deeply mixed sub-cloud layer will tend to limit precipitation accumulations over many areas. As a result, isolated lightning-induced ignitions will be possible over dry fuels, along with gusty/erratic outflow winds. ..Weinman.. 08/23/2025 ...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 0156 AM CDT Sat Aug 23 2025 Valid 231200Z - 241200Z ...Synopsis... An expansive midlevel high will remain in place over the Four Corners vicinity, while deepening monsoonal moisture continues spreading northward across the Great Basin into the Northwest. Along the western periphery of the midlevel high, an unseasonably hot/unstable air mass will persist across much of CA into the Great Basin, where another day of diurnally driven showers and thunderstorms are expected. While the gradually deepening monsoonal moisture will favor a mix of wet/dry thunderstorms, a dry/deeply mixed sub-cloud layer will tend to limit precipitation accumulations over many areas. As a result, isolated lightning-induced ignitions will be possible over dry fuels, along with gusty/erratic outflow winds. ..Weinman.. 08/23/2025 ...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 0156 AM CDT Sat Aug 23 2025 Valid 231200Z - 241200Z ...Synopsis... An expansive midlevel high will remain in place over the Four Corners vicinity, while deepening monsoonal moisture continues spreading northward across the Great Basin into the Northwest. Along the western periphery of the midlevel high, an unseasonably hot/unstable air mass will persist across much of CA into the Great Basin, where another day of diurnally driven showers and thunderstorms are expected. While the gradually deepening monsoonal moisture will favor a mix of wet/dry thunderstorms, a dry/deeply mixed sub-cloud layer will tend to limit precipitation accumulations over many areas. As a result, isolated lightning-induced ignitions will be possible over dry fuels, along with gusty/erratic outflow winds. ..Weinman.. 08/23/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0115 AM CDT Sat Aug 23 2025 Valid 241200Z - 251200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL HIGH PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across eastern Colorado into western Kansas Sunday afternoon and evening. ...Eastern Colorado/Western Kansas... A mid-level large-scale trough will dig southeastward into the eastern U.S. on Sunday, as northwesterly flow remains over much of the central and northern U.S. At the surface, an area of high pressure will move southward across the Great Plains. A slow-moving front will remain in place in eastern Colorado along the western periphery of the surface high. Elevated thunderstorms are expected to develop well to the east of the boundary across parts of western Kansas Sunday morning. Closer to the boundary itself, moderate instability is forecast to develop during the day across the eastern third of Colorado. As surface heating takes place and as low-level convergence increases near the boundary, scattered surface-based convection initiation is expected during the afternoon. This convection is forecast to increase in coverage during the late afternoon, being supported by large-scale ascent associated with a subtle shortwave trough moving through the central Plains. The storms are expected to move southeastward across eastern Colorado into southwest Kansas, with a few storms continuing into the early to mid evening. NAM forecast soundings in the vicinity of the instability axis around 21Z have MLCAPE near 2500 J/kg, with 0-6 km shear around 40 knots. This combined with 700-500 mb lapse rates of 7 to 7.5 C/km may be enough for isolated severe storms. A potential will exist for a supercell or two. Hail and marginally severe wind gusts will be the primary threats. ..Broyles.. 08/23/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0115 AM CDT Sat Aug 23 2025 Valid 241200Z - 251200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL HIGH PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across eastern Colorado into western Kansas Sunday afternoon and evening. ...Eastern Colorado/Western Kansas... A mid-level large-scale trough will dig southeastward into the eastern U.S. on Sunday, as northwesterly flow remains over much of the central and northern U.S. At the surface, an area of high pressure will move southward across the Great Plains. A slow-moving front will remain in place in eastern Colorado along the western periphery of the surface high. Elevated thunderstorms are expected to develop well to the east of the boundary across parts of western Kansas Sunday morning. Closer to the boundary itself, moderate instability is forecast to develop during the day across the eastern third of Colorado. As surface heating takes place and as low-level convergence increases near the boundary, scattered surface-based convection initiation is expected during the afternoon. This convection is forecast to increase in coverage during the late afternoon, being supported by large-scale ascent associated with a subtle shortwave trough moving through the central Plains. The storms are expected to move southeastward across eastern Colorado into southwest Kansas, with a few storms continuing into the early to mid evening. NAM forecast soundings in the vicinity of the instability axis around 21Z have MLCAPE near 2500 J/kg, with 0-6 km shear around 40 knots. This combined with 700-500 mb lapse rates of 7 to 7.5 C/km may be enough for isolated severe storms. A potential will exist for a supercell or two. Hail and marginally severe wind gusts will be the primary threats. ..Broyles.. 08/23/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0115 AM CDT Sat Aug 23 2025 Valid 241200Z - 251200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL HIGH PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across eastern Colorado into western Kansas Sunday afternoon and evening. ...Eastern Colorado/Western Kansas... A mid-level large-scale trough will dig southeastward into the eastern U.S. on Sunday, as northwesterly flow remains over much of the central and northern U.S. At the surface, an area of high pressure will move southward across the Great Plains. A slow-moving front will remain in place in eastern Colorado along the western periphery of the surface high. Elevated thunderstorms are expected to develop well to the east of the boundary across parts of western Kansas Sunday morning. Closer to the boundary itself, moderate instability is forecast to develop during the day across the eastern third of Colorado. As surface heating takes place and as low-level convergence increases near the boundary, scattered surface-based convection initiation is expected during the afternoon. This convection is forecast to increase in coverage during the late afternoon, being supported by large-scale ascent associated with a subtle shortwave trough moving through the central Plains. The storms are expected to move southeastward across eastern Colorado into southwest Kansas, with a few storms continuing into the early to mid evening. NAM forecast soundings in the vicinity of the instability axis around 21Z have MLCAPE near 2500 J/kg, with 0-6 km shear around 40 knots. This combined with 700-500 mb lapse rates of 7 to 7.5 C/km may be enough for isolated severe storms. A potential will exist for a supercell or two. Hail and marginally severe wind gusts will be the primary threats. ..Broyles.. 08/23/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0115 AM CDT Sat Aug 23 2025 Valid 241200Z - 251200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL HIGH PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across eastern Colorado into western Kansas Sunday afternoon and evening. ...Eastern Colorado/Western Kansas... A mid-level large-scale trough will dig southeastward into the eastern U.S. on Sunday, as northwesterly flow remains over much of the central and northern U.S. At the surface, an area of high pressure will move southward across the Great Plains. A slow-moving front will remain in place in eastern Colorado along the western periphery of the surface high. Elevated thunderstorms are expected to develop well to the east of the boundary across parts of western Kansas Sunday morning. Closer to the boundary itself, moderate instability is forecast to develop during the day across the eastern third of Colorado. As surface heating takes place and as low-level convergence increases near the boundary, scattered surface-based convection initiation is expected during the afternoon. This convection is forecast to increase in coverage during the late afternoon, being supported by large-scale ascent associated with a subtle shortwave trough moving through the central Plains. The storms are expected to move southeastward across eastern Colorado into southwest Kansas, with a few storms continuing into the early to mid evening. NAM forecast soundings in the vicinity of the instability axis around 21Z have MLCAPE near 2500 J/kg, with 0-6 km shear around 40 knots. This combined with 700-500 mb lapse rates of 7 to 7.5 C/km may be enough for isolated severe storms. A potential will exist for a supercell or two. Hail and marginally severe wind gusts will be the primary threats. ..Broyles.. 08/23/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1244 AM CDT Sat Aug 23 2025 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL HIGH PLAINS.... ...SUMMARY... Strong to isolated severe storms are possible in the central High Plains today. ...Synopsis... A mid-level trough will amplify across the Great Lakes today with strengthening mid-level flow across the Northern Plains. Surface high pressure building into the northern Plains this morning will advance into the central Plains by this afternoon and push a cold front south across the Plains and Upper Midwest. Farther east, a cold front, associated with the mid-level trough across the northern Great Lakes, will move across the Great Lakes and Ohio Valley. ...Central High Plains... Upslope flow in the wake of the cold front across the central High Plains may provide an environment favorable for a few isolated strong to severe storms this afternoon/evening. Terrain driven storms are anticipated across much of the central Rockies. A few storms are expected to move off of the higher terrain, and with support from low-level upslope flow, maintain themselves along the Front Range as they move south. Steep mid-level lapse rates and around 35 to 40 knots of mid-level flow will support the potential for isolated supercell structures capable of isolated large hail and severe wind gusts. Storm motions around 350 degrees and storm formation expected along the mountains and immediate foothills will result in a very narrow area of risk along the Front Range from southeast Wyoming to central Colorado. Slightly stronger instability across southeast Colorado and the potential for some clustering of storms supports a slightly wider marginal extending into this region. ...Great Lakes... A few showers and thunderstorms will likely develop along a cold front as it moves across the Great Lakes this afternoon. Warm 700mb temperatures in the presence of only low 60s dewpoints will limit overall buoyancy and updraft strength. Therefore, no severe thunderstorms are expected. ..Bentley/Weinman.. 08/23/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1244 AM CDT Sat Aug 23 2025 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL HIGH PLAINS.... ...SUMMARY... Strong to isolated severe storms are possible in the central High Plains today. ...Synopsis... A mid-level trough will amplify across the Great Lakes today with strengthening mid-level flow across the Northern Plains. Surface high pressure building into the northern Plains this morning will advance into the central Plains by this afternoon and push a cold front south across the Plains and Upper Midwest. Farther east, a cold front, associated with the mid-level trough across the northern Great Lakes, will move across the Great Lakes and Ohio Valley. ...Central High Plains... Upslope flow in the wake of the cold front across the central High Plains may provide an environment favorable for a few isolated strong to severe storms this afternoon/evening. Terrain driven storms are anticipated across much of the central Rockies. A few storms are expected to move off of the higher terrain, and with support from low-level upslope flow, maintain themselves along the Front Range as they move south. Steep mid-level lapse rates and around 35 to 40 knots of mid-level flow will support the potential for isolated supercell structures capable of isolated large hail and severe wind gusts. Storm motions around 350 degrees and storm formation expected along the mountains and immediate foothills will result in a very narrow area of risk along the Front Range from southeast Wyoming to central Colorado. Slightly stronger instability across southeast Colorado and the potential for some clustering of storms supports a slightly wider marginal extending into this region. ...Great Lakes... A few showers and thunderstorms will likely develop along a cold front as it moves across the Great Lakes this afternoon. Warm 700mb temperatures in the presence of only low 60s dewpoints will limit overall buoyancy and updraft strength. Therefore, no severe thunderstorms are expected. ..Bentley/Weinman.. 08/23/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1244 AM CDT Sat Aug 23 2025 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL HIGH PLAINS.... ...SUMMARY... Strong to isolated severe storms are possible in the central High Plains today. ...Synopsis... A mid-level trough will amplify across the Great Lakes today with strengthening mid-level flow across the Northern Plains. Surface high pressure building into the northern Plains this morning will advance into the central Plains by this afternoon and push a cold front south across the Plains and Upper Midwest. Farther east, a cold front, associated with the mid-level trough across the northern Great Lakes, will move across the Great Lakes and Ohio Valley. ...Central High Plains... Upslope flow in the wake of the cold front across the central High Plains may provide an environment favorable for a few isolated strong to severe storms this afternoon/evening. Terrain driven storms are anticipated across much of the central Rockies. A few storms are expected to move off of the higher terrain, and with support from low-level upslope flow, maintain themselves along the Front Range as they move south. Steep mid-level lapse rates and around 35 to 40 knots of mid-level flow will support the potential for isolated supercell structures capable of isolated large hail and severe wind gusts. Storm motions around 350 degrees and storm formation expected along the mountains and immediate foothills will result in a very narrow area of risk along the Front Range from southeast Wyoming to central Colorado. Slightly stronger instability across southeast Colorado and the potential for some clustering of storms supports a slightly wider marginal extending into this region. ...Great Lakes... A few showers and thunderstorms will likely develop along a cold front as it moves across the Great Lakes this afternoon. Warm 700mb temperatures in the presence of only low 60s dewpoints will limit overall buoyancy and updraft strength. Therefore, no severe thunderstorms are expected. ..Bentley/Weinman.. 08/23/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1244 AM CDT Sat Aug 23 2025 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL HIGH PLAINS.... ...SUMMARY... Strong to isolated severe storms are possible in the central High Plains today. ...Synopsis... A mid-level trough will amplify across the Great Lakes today with strengthening mid-level flow across the Northern Plains. Surface high pressure building into the northern Plains this morning will advance into the central Plains by this afternoon and push a cold front south across the Plains and Upper Midwest. Farther east, a cold front, associated with the mid-level trough across the northern Great Lakes, will move across the Great Lakes and Ohio Valley. ...Central High Plains... Upslope flow in the wake of the cold front across the central High Plains may provide an environment favorable for a few isolated strong to severe storms this afternoon/evening. Terrain driven storms are anticipated across much of the central Rockies. A few storms are expected to move off of the higher terrain, and with support from low-level upslope flow, maintain themselves along the Front Range as they move south. Steep mid-level lapse rates and around 35 to 40 knots of mid-level flow will support the potential for isolated supercell structures capable of isolated large hail and severe wind gusts. Storm motions around 350 degrees and storm formation expected along the mountains and immediate foothills will result in a very narrow area of risk along the Front Range from southeast Wyoming to central Colorado. Slightly stronger instability across southeast Colorado and the potential for some clustering of storms supports a slightly wider marginal extending into this region. ...Great Lakes... A few showers and thunderstorms will likely develop along a cold front as it moves across the Great Lakes this afternoon. Warm 700mb temperatures in the presence of only low 60s dewpoints will limit overall buoyancy and updraft strength. Therefore, no severe thunderstorms are expected. ..Bentley/Weinman.. 08/23/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1244 AM CDT Sat Aug 23 2025 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL HIGH PLAINS.... ...SUMMARY... Strong to isolated severe storms are possible in the central High Plains today. ...Synopsis... A mid-level trough will amplify across the Great Lakes today with strengthening mid-level flow across the Northern Plains. Surface high pressure building into the northern Plains this morning will advance into the central Plains by this afternoon and push a cold front south across the Plains and Upper Midwest. Farther east, a cold front, associated with the mid-level trough across the northern Great Lakes, will move across the Great Lakes and Ohio Valley. ...Central High Plains... Upslope flow in the wake of the cold front across the central High Plains may provide an environment favorable for a few isolated strong to severe storms this afternoon/evening. Terrain driven storms are anticipated across much of the central Rockies. A few storms are expected to move off of the higher terrain, and with support from low-level upslope flow, maintain themselves along the Front Range as they move south. Steep mid-level lapse rates and around 35 to 40 knots of mid-level flow will support the potential for isolated supercell structures capable of isolated large hail and severe wind gusts. Storm motions around 350 degrees and storm formation expected along the mountains and immediate foothills will result in a very narrow area of risk along the Front Range from southeast Wyoming to central Colorado. Slightly stronger instability across southeast Colorado and the potential for some clustering of storms supports a slightly wider marginal extending into this region. ...Great Lakes... A few showers and thunderstorms will likely develop along a cold front as it moves across the Great Lakes this afternoon. Warm 700mb temperatures in the presence of only low 60s dewpoints will limit overall buoyancy and updraft strength. Therefore, no severe thunderstorms are expected. ..Bentley/Weinman.. 08/23/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0757 PM CDT Fri Aug 22 2025 Valid 230100Z - 231200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE CENTRAL HIGH PLAINS TO THE UPPER MIDWEST... ...SUMMARY... Isolated strong to locally severe thunderstorms may occur this evening and into tonight from parts of the northern and central High Plains to the Upper Midwest/Great Lakes, and separately across parts of Arizona. Damaging winds and occasional hail should be the main threats. ...Upper Midwest... A cluster of storms across northern Wisconsin and the UP has now moved into Canada and is weakening on the eastern periphery of the better instability. In the wake of this activity, a few storms have developed along a cold front moving through northern Minnesota with a few isolated showers/storms developing ahead of it. Have adjusted the thunder line west to account for these storms and will keep the marginal across southeast Minnesota and northwest Wisconsin where instability remains. This threat will likely only continue for a few more hours before a cooling boundary layer stabilizes the area. ...Central Plains into the central High Plains... The earlier cluster of storms across eastern Nebraska moved south and weakened as it moved into a more stable airmass across southern Nebraska. However, an additional storm developed across east-central Nebraska where 2000 J/kg MLCAPE is present. This threat may remain for a few more hours before eventual nocturnal stabilization ends the threat. Storms across Wyoming and northeast Colorado have been relatively weak thus far. However, as heights continue to fall across the region, expect these storms to maintain with additional storm development also possible. Weak to moderate instability with 30 to 35 knots of shear will support the potential for isolated strong storms capable of large hail or severe wind gusts this evening and into the early overnight hours. ..Bentley.. 08/23/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0757 PM CDT Fri Aug 22 2025 Valid 230100Z - 231200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE CENTRAL HIGH PLAINS TO THE UPPER MIDWEST... ...SUMMARY... Isolated strong to locally severe thunderstorms may occur this evening and into tonight from parts of the northern and central High Plains to the Upper Midwest/Great Lakes, and separately across parts of Arizona. Damaging winds and occasional hail should be the main threats. ...Upper Midwest... A cluster of storms across northern Wisconsin and the UP has now moved into Canada and is weakening on the eastern periphery of the better instability. In the wake of this activity, a few storms have developed along a cold front moving through northern Minnesota with a few isolated showers/storms developing ahead of it. Have adjusted the thunder line west to account for these storms and will keep the marginal across southeast Minnesota and northwest Wisconsin where instability remains. This threat will likely only continue for a few more hours before a cooling boundary layer stabilizes the area. ...Central Plains into the central High Plains... The earlier cluster of storms across eastern Nebraska moved south and weakened as it moved into a more stable airmass across southern Nebraska. However, an additional storm developed across east-central Nebraska where 2000 J/kg MLCAPE is present. This threat may remain for a few more hours before eventual nocturnal stabilization ends the threat. Storms across Wyoming and northeast Colorado have been relatively weak thus far. However, as heights continue to fall across the region, expect these storms to maintain with additional storm development also possible. Weak to moderate instability with 30 to 35 knots of shear will support the potential for isolated strong storms capable of large hail or severe wind gusts this evening and into the early overnight hours. ..Bentley.. 08/23/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0757 PM CDT Fri Aug 22 2025 Valid 230100Z - 231200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE CENTRAL HIGH PLAINS TO THE UPPER MIDWEST... ...SUMMARY... Isolated strong to locally severe thunderstorms may occur this evening and into tonight from parts of the northern and central High Plains to the Upper Midwest/Great Lakes, and separately across parts of Arizona. Damaging winds and occasional hail should be the main threats. ...Upper Midwest... A cluster of storms across northern Wisconsin and the UP has now moved into Canada and is weakening on the eastern periphery of the better instability. In the wake of this activity, a few storms have developed along a cold front moving through northern Minnesota with a few isolated showers/storms developing ahead of it. Have adjusted the thunder line west to account for these storms and will keep the marginal across southeast Minnesota and northwest Wisconsin where instability remains. This threat will likely only continue for a few more hours before a cooling boundary layer stabilizes the area. ...Central Plains into the central High Plains... The earlier cluster of storms across eastern Nebraska moved south and weakened as it moved into a more stable airmass across southern Nebraska. However, an additional storm developed across east-central Nebraska where 2000 J/kg MLCAPE is present. This threat may remain for a few more hours before eventual nocturnal stabilization ends the threat. Storms across Wyoming and northeast Colorado have been relatively weak thus far. However, as heights continue to fall across the region, expect these storms to maintain with additional storm development also possible. Weak to moderate instability with 30 to 35 knots of shear will support the potential for isolated strong storms capable of large hail or severe wind gusts this evening and into the early overnight hours. ..Bentley.. 08/23/2025 Read more