Severe Storms

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0358 AM CDT Sun Sep 07 2025 Valid 101200Z - 151200Z ...DISCUSSION... The mid-level flow pattern across the US is forecast to become more stagnant into the extended-range forecast period as the western US upper low deepens and shortwave ridging over the Plains moves slowly eastward. Broad troughing over the East should gradually consolidate, slowing eastward progress of the upper ridge. As the western trough slowly approaches the Rockies, a lee trough should sharpen each afternoon with a narrow zone of moisture return along and east into parts of the High Plains. Sufficient destabilization is expected to support isolated thunderstorms, and perhaps some severe risk, near the lee trough as smaller embedded perturbations eject eastward periodically. However, with only slow movement of the upper ridge expected, forcing for ascent should remain modest until early next weekend. Somewhat greater severe potential may develop D6/Friday or D7/Saturday as the primary upper trough begins to emerge over the Plains. However, given the uncertainties associated with the smaller scale features, and the timing of the main trough, limited confidence exists regarding severe potential in the extended forecast. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0358 AM CDT Sun Sep 07 2025 Valid 101200Z - 151200Z ...DISCUSSION... The mid-level flow pattern across the US is forecast to become more stagnant into the extended-range forecast period as the western US upper low deepens and shortwave ridging over the Plains moves slowly eastward. Broad troughing over the East should gradually consolidate, slowing eastward progress of the upper ridge. As the western trough slowly approaches the Rockies, a lee trough should sharpen each afternoon with a narrow zone of moisture return along and east into parts of the High Plains. Sufficient destabilization is expected to support isolated thunderstorms, and perhaps some severe risk, near the lee trough as smaller embedded perturbations eject eastward periodically. However, with only slow movement of the upper ridge expected, forcing for ascent should remain modest until early next weekend. Somewhat greater severe potential may develop D6/Friday or D7/Saturday as the primary upper trough begins to emerge over the Plains. However, given the uncertainties associated with the smaller scale features, and the timing of the main trough, limited confidence exists regarding severe potential in the extended forecast. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0358 AM CDT Sun Sep 07 2025 Valid 101200Z - 151200Z ...DISCUSSION... The mid-level flow pattern across the US is forecast to become more stagnant into the extended-range forecast period as the western US upper low deepens and shortwave ridging over the Plains moves slowly eastward. Broad troughing over the East should gradually consolidate, slowing eastward progress of the upper ridge. As the western trough slowly approaches the Rockies, a lee trough should sharpen each afternoon with a narrow zone of moisture return along and east into parts of the High Plains. Sufficient destabilization is expected to support isolated thunderstorms, and perhaps some severe risk, near the lee trough as smaller embedded perturbations eject eastward periodically. However, with only slow movement of the upper ridge expected, forcing for ascent should remain modest until early next weekend. Somewhat greater severe potential may develop D6/Friday or D7/Saturday as the primary upper trough begins to emerge over the Plains. However, given the uncertainties associated with the smaller scale features, and the timing of the main trough, limited confidence exists regarding severe potential in the extended forecast. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0358 AM CDT Sun Sep 07 2025 Valid 101200Z - 151200Z ...DISCUSSION... The mid-level flow pattern across the US is forecast to become more stagnant into the extended-range forecast period as the western US upper low deepens and shortwave ridging over the Plains moves slowly eastward. Broad troughing over the East should gradually consolidate, slowing eastward progress of the upper ridge. As the western trough slowly approaches the Rockies, a lee trough should sharpen each afternoon with a narrow zone of moisture return along and east into parts of the High Plains. Sufficient destabilization is expected to support isolated thunderstorms, and perhaps some severe risk, near the lee trough as smaller embedded perturbations eject eastward periodically. However, with only slow movement of the upper ridge expected, forcing for ascent should remain modest until early next weekend. Somewhat greater severe potential may develop D6/Friday or D7/Saturday as the primary upper trough begins to emerge over the Plains. However, given the uncertainties associated with the smaller scale features, and the timing of the main trough, limited confidence exists regarding severe potential in the extended forecast. Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sun Sep 07 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few strong storms are possible over the central Plains and Upper Midwest Tuesday, but overall severe potential is low. ...Synopsis... A broad upper trough across the Pacific Northwest is forecast to intensify as it shifts eastward, impinging on the western flank of a shortwave ridge centered over the Rockies. To the east, persistent troughing should remain in place, with surface high pressure dominating the eastern half of the country. As southwesterly flow aloft increases over the western US and central Rockies, a subtle shortwave trough/vort max will pass over the crest of the ridge and into the Plains Tuesday afternoon and evening. This should aid in strengthening a lee trough over the High Plains, potentially serving as a focus for isolated thunderstorm development. ...Central High Plains.. Continued low-level southerly flow will advect richer surface moisture northwestward across the High Plains beginning early Tuesday. As dewpoints increase into the low to mid 60s F, strong heating should support robust destabilization along and east of the lee trough. 1500-2500 J/kg of MLCAPE will develop beneath substantial capping as mid-level heights will likely remain neutral through much of the day. Eventually, weak ascent from the embedded shortwave trough and low-level upslope flow may allow for isolated storm development along the lee trough over the central High Plains. Northwesterly flow aloft will be marginally supportive of organized storms, including the potential for supercells. However, given the capping and weak ascent, considerable uncertainty remains regarding storm coverage and severity. While sporadic hail and severe gusts cannot be ruled out, confidence remains too low for severe probabilities at this time. ...Northern Plains and Upper Midwest... A diffuse front will stall across the northern Plains/Upper Midwest early Tuesday beneath the western extension of the broad eastern US trough. Weak low-level warm air advection may support scattered showers and thunderstorms through much of Tuesday near the front. These parcels are likely to be elevated along and north of the front with modest buoyancy and vertical shear expected to limit overall severe potential. Still, a few stronger storms with sporadic hail potential may evolve, though confidence in a sustained severe risk is low. ..Lyons.. 09/07/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sun Sep 07 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few strong storms are possible over the central Plains and Upper Midwest Tuesday, but overall severe potential is low. ...Synopsis... A broad upper trough across the Pacific Northwest is forecast to intensify as it shifts eastward, impinging on the western flank of a shortwave ridge centered over the Rockies. To the east, persistent troughing should remain in place, with surface high pressure dominating the eastern half of the country. As southwesterly flow aloft increases over the western US and central Rockies, a subtle shortwave trough/vort max will pass over the crest of the ridge and into the Plains Tuesday afternoon and evening. This should aid in strengthening a lee trough over the High Plains, potentially serving as a focus for isolated thunderstorm development. ...Central High Plains.. Continued low-level southerly flow will advect richer surface moisture northwestward across the High Plains beginning early Tuesday. As dewpoints increase into the low to mid 60s F, strong heating should support robust destabilization along and east of the lee trough. 1500-2500 J/kg of MLCAPE will develop beneath substantial capping as mid-level heights will likely remain neutral through much of the day. Eventually, weak ascent from the embedded shortwave trough and low-level upslope flow may allow for isolated storm development along the lee trough over the central High Plains. Northwesterly flow aloft will be marginally supportive of organized storms, including the potential for supercells. However, given the capping and weak ascent, considerable uncertainty remains regarding storm coverage and severity. While sporadic hail and severe gusts cannot be ruled out, confidence remains too low for severe probabilities at this time. ...Northern Plains and Upper Midwest... A diffuse front will stall across the northern Plains/Upper Midwest early Tuesday beneath the western extension of the broad eastern US trough. Weak low-level warm air advection may support scattered showers and thunderstorms through much of Tuesday near the front. These parcels are likely to be elevated along and north of the front with modest buoyancy and vertical shear expected to limit overall severe potential. Still, a few stronger storms with sporadic hail potential may evolve, though confidence in a sustained severe risk is low. ..Lyons.. 09/07/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sun Sep 07 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few strong storms are possible over the central Plains and Upper Midwest Tuesday, but overall severe potential is low. ...Synopsis... A broad upper trough across the Pacific Northwest is forecast to intensify as it shifts eastward, impinging on the western flank of a shortwave ridge centered over the Rockies. To the east, persistent troughing should remain in place, with surface high pressure dominating the eastern half of the country. As southwesterly flow aloft increases over the western US and central Rockies, a subtle shortwave trough/vort max will pass over the crest of the ridge and into the Plains Tuesday afternoon and evening. This should aid in strengthening a lee trough over the High Plains, potentially serving as a focus for isolated thunderstorm development. ...Central High Plains.. Continued low-level southerly flow will advect richer surface moisture northwestward across the High Plains beginning early Tuesday. As dewpoints increase into the low to mid 60s F, strong heating should support robust destabilization along and east of the lee trough. 1500-2500 J/kg of MLCAPE will develop beneath substantial capping as mid-level heights will likely remain neutral through much of the day. Eventually, weak ascent from the embedded shortwave trough and low-level upslope flow may allow for isolated storm development along the lee trough over the central High Plains. Northwesterly flow aloft will be marginally supportive of organized storms, including the potential for supercells. However, given the capping and weak ascent, considerable uncertainty remains regarding storm coverage and severity. While sporadic hail and severe gusts cannot be ruled out, confidence remains too low for severe probabilities at this time. ...Northern Plains and Upper Midwest... A diffuse front will stall across the northern Plains/Upper Midwest early Tuesday beneath the western extension of the broad eastern US trough. Weak low-level warm air advection may support scattered showers and thunderstorms through much of Tuesday near the front. These parcels are likely to be elevated along and north of the front with modest buoyancy and vertical shear expected to limit overall severe potential. Still, a few stronger storms with sporadic hail potential may evolve, though confidence in a sustained severe risk is low. ..Lyons.. 09/07/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sun Sep 07 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few strong storms are possible over the central Plains and Upper Midwest Tuesday, but overall severe potential is low. ...Synopsis... A broad upper trough across the Pacific Northwest is forecast to intensify as it shifts eastward, impinging on the western flank of a shortwave ridge centered over the Rockies. To the east, persistent troughing should remain in place, with surface high pressure dominating the eastern half of the country. As southwesterly flow aloft increases over the western US and central Rockies, a subtle shortwave trough/vort max will pass over the crest of the ridge and into the Plains Tuesday afternoon and evening. This should aid in strengthening a lee trough over the High Plains, potentially serving as a focus for isolated thunderstorm development. ...Central High Plains.. Continued low-level southerly flow will advect richer surface moisture northwestward across the High Plains beginning early Tuesday. As dewpoints increase into the low to mid 60s F, strong heating should support robust destabilization along and east of the lee trough. 1500-2500 J/kg of MLCAPE will develop beneath substantial capping as mid-level heights will likely remain neutral through much of the day. Eventually, weak ascent from the embedded shortwave trough and low-level upslope flow may allow for isolated storm development along the lee trough over the central High Plains. Northwesterly flow aloft will be marginally supportive of organized storms, including the potential for supercells. However, given the capping and weak ascent, considerable uncertainty remains regarding storm coverage and severity. While sporadic hail and severe gusts cannot be ruled out, confidence remains too low for severe probabilities at this time. ...Northern Plains and Upper Midwest... A diffuse front will stall across the northern Plains/Upper Midwest early Tuesday beneath the western extension of the broad eastern US trough. Weak low-level warm air advection may support scattered showers and thunderstorms through much of Tuesday near the front. These parcels are likely to be elevated along and north of the front with modest buoyancy and vertical shear expected to limit overall severe potential. Still, a few stronger storms with sporadic hail potential may evolve, though confidence in a sustained severe risk is low. ..Lyons.. 09/07/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sun Sep 07 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few strong storms are possible over the central Plains and Upper Midwest Tuesday, but overall severe potential is low. ...Synopsis... A broad upper trough across the Pacific Northwest is forecast to intensify as it shifts eastward, impinging on the western flank of a shortwave ridge centered over the Rockies. To the east, persistent troughing should remain in place, with surface high pressure dominating the eastern half of the country. As southwesterly flow aloft increases over the western US and central Rockies, a subtle shortwave trough/vort max will pass over the crest of the ridge and into the Plains Tuesday afternoon and evening. This should aid in strengthening a lee trough over the High Plains, potentially serving as a focus for isolated thunderstorm development. ...Central High Plains.. Continued low-level southerly flow will advect richer surface moisture northwestward across the High Plains beginning early Tuesday. As dewpoints increase into the low to mid 60s F, strong heating should support robust destabilization along and east of the lee trough. 1500-2500 J/kg of MLCAPE will develop beneath substantial capping as mid-level heights will likely remain neutral through much of the day. Eventually, weak ascent from the embedded shortwave trough and low-level upslope flow may allow for isolated storm development along the lee trough over the central High Plains. Northwesterly flow aloft will be marginally supportive of organized storms, including the potential for supercells. However, given the capping and weak ascent, considerable uncertainty remains regarding storm coverage and severity. While sporadic hail and severe gusts cannot be ruled out, confidence remains too low for severe probabilities at this time. ...Northern Plains and Upper Midwest... A diffuse front will stall across the northern Plains/Upper Midwest early Tuesday beneath the western extension of the broad eastern US trough. Weak low-level warm air advection may support scattered showers and thunderstorms through much of Tuesday near the front. These parcels are likely to be elevated along and north of the front with modest buoyancy and vertical shear expected to limit overall severe potential. Still, a few stronger storms with sporadic hail potential may evolve, though confidence in a sustained severe risk is low. ..Lyons.. 09/07/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sun Sep 07 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few strong storms are possible over the central Plains and Upper Midwest Tuesday, but overall severe potential is low. ...Synopsis... A broad upper trough across the Pacific Northwest is forecast to intensify as it shifts eastward, impinging on the western flank of a shortwave ridge centered over the Rockies. To the east, persistent troughing should remain in place, with surface high pressure dominating the eastern half of the country. As southwesterly flow aloft increases over the western US and central Rockies, a subtle shortwave trough/vort max will pass over the crest of the ridge and into the Plains Tuesday afternoon and evening. This should aid in strengthening a lee trough over the High Plains, potentially serving as a focus for isolated thunderstorm development. ...Central High Plains.. Continued low-level southerly flow will advect richer surface moisture northwestward across the High Plains beginning early Tuesday. As dewpoints increase into the low to mid 60s F, strong heating should support robust destabilization along and east of the lee trough. 1500-2500 J/kg of MLCAPE will develop beneath substantial capping as mid-level heights will likely remain neutral through much of the day. Eventually, weak ascent from the embedded shortwave trough and low-level upslope flow may allow for isolated storm development along the lee trough over the central High Plains. Northwesterly flow aloft will be marginally supportive of organized storms, including the potential for supercells. However, given the capping and weak ascent, considerable uncertainty remains regarding storm coverage and severity. While sporadic hail and severe gusts cannot be ruled out, confidence remains too low for severe probabilities at this time. ...Northern Plains and Upper Midwest... A diffuse front will stall across the northern Plains/Upper Midwest early Tuesday beneath the western extension of the broad eastern US trough. Weak low-level warm air advection may support scattered showers and thunderstorms through much of Tuesday near the front. These parcels are likely to be elevated along and north of the front with modest buoyancy and vertical shear expected to limit overall severe potential. Still, a few stronger storms with sporadic hail potential may evolve, though confidence in a sustained severe risk is low. ..Lyons.. 09/07/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sun Sep 07 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few strong storms are possible over the central Plains and Upper Midwest Tuesday, but overall severe potential is low. ...Synopsis... A broad upper trough across the Pacific Northwest is forecast to intensify as it shifts eastward, impinging on the western flank of a shortwave ridge centered over the Rockies. To the east, persistent troughing should remain in place, with surface high pressure dominating the eastern half of the country. As southwesterly flow aloft increases over the western US and central Rockies, a subtle shortwave trough/vort max will pass over the crest of the ridge and into the Plains Tuesday afternoon and evening. This should aid in strengthening a lee trough over the High Plains, potentially serving as a focus for isolated thunderstorm development. ...Central High Plains.. Continued low-level southerly flow will advect richer surface moisture northwestward across the High Plains beginning early Tuesday. As dewpoints increase into the low to mid 60s F, strong heating should support robust destabilization along and east of the lee trough. 1500-2500 J/kg of MLCAPE will develop beneath substantial capping as mid-level heights will likely remain neutral through much of the day. Eventually, weak ascent from the embedded shortwave trough and low-level upslope flow may allow for isolated storm development along the lee trough over the central High Plains. Northwesterly flow aloft will be marginally supportive of organized storms, including the potential for supercells. However, given the capping and weak ascent, considerable uncertainty remains regarding storm coverage and severity. While sporadic hail and severe gusts cannot be ruled out, confidence remains too low for severe probabilities at this time. ...Northern Plains and Upper Midwest... A diffuse front will stall across the northern Plains/Upper Midwest early Tuesday beneath the western extension of the broad eastern US trough. Weak low-level warm air advection may support scattered showers and thunderstorms through much of Tuesday near the front. These parcels are likely to be elevated along and north of the front with modest buoyancy and vertical shear expected to limit overall severe potential. Still, a few stronger storms with sporadic hail potential may evolve, though confidence in a sustained severe risk is low. ..Lyons.. 09/07/2025 Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0146 AM CDT Sun Sep 07 2025 Valid 081200Z - 091200Z ...NO CRITICAL AREAS... ...Synopsis... A mid-level trough will overspread the western U.S. as upper ridging builds into the Plains states tomorrow (Monday). Another day of locally dry and breezy conditions is expected across the Great Basin, though widespread and longer-lasting winds/RH reaching Elevated criteria appears less likely. Thunderstorms, driven by strong forcing for ascent with this upper trough, will develop over the windward side of the Cascades and progress eastward through the day. However, fuels are most receptive toward the northern Rockies. Storms should approach the northern Rockies after dark, though it is unclear how dry they will be, and how much overlap will occur with the most receptive fuels, precluding isolated dry thunderstorm highlights this outlook. ..Squitieri.. 09/07/2025 ...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 0146 AM CDT Sun Sep 07 2025 Valid 081200Z - 091200Z ...NO CRITICAL AREAS... ...Synopsis... A mid-level trough will overspread the western U.S. as upper ridging builds into the Plains states tomorrow (Monday). Another day of locally dry and breezy conditions is expected across the Great Basin, though widespread and longer-lasting winds/RH reaching Elevated criteria appears less likely. Thunderstorms, driven by strong forcing for ascent with this upper trough, will develop over the windward side of the Cascades and progress eastward through the day. However, fuels are most receptive toward the northern Rockies. Storms should approach the northern Rockies after dark, though it is unclear how dry they will be, and how much overlap will occur with the most receptive fuels, precluding isolated dry thunderstorm highlights this outlook. ..Squitieri.. 09/07/2025 ...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 0146 AM CDT Sun Sep 07 2025 Valid 081200Z - 091200Z ...NO CRITICAL AREAS... ...Synopsis... A mid-level trough will overspread the western U.S. as upper ridging builds into the Plains states tomorrow (Monday). Another day of locally dry and breezy conditions is expected across the Great Basin, though widespread and longer-lasting winds/RH reaching Elevated criteria appears less likely. Thunderstorms, driven by strong forcing for ascent with this upper trough, will develop over the windward side of the Cascades and progress eastward through the day. However, fuels are most receptive toward the northern Rockies. Storms should approach the northern Rockies after dark, though it is unclear how dry they will be, and how much overlap will occur with the most receptive fuels, precluding isolated dry thunderstorm highlights this outlook. ..Squitieri.. 09/07/2025 ...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 0146 AM CDT Sun Sep 07 2025 Valid 081200Z - 091200Z ...NO CRITICAL AREAS... ...Synopsis... A mid-level trough will overspread the western U.S. as upper ridging builds into the Plains states tomorrow (Monday). Another day of locally dry and breezy conditions is expected across the Great Basin, though widespread and longer-lasting winds/RH reaching Elevated criteria appears less likely. Thunderstorms, driven by strong forcing for ascent with this upper trough, will develop over the windward side of the Cascades and progress eastward through the day. However, fuels are most receptive toward the northern Rockies. Storms should approach the northern Rockies after dark, though it is unclear how dry they will be, and how much overlap will occur with the most receptive fuels, precluding isolated dry thunderstorm highlights this outlook. ..Squitieri.. 09/07/2025 ...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 0146 AM CDT Sun Sep 07 2025 Valid 081200Z - 091200Z ...NO CRITICAL AREAS... ...Synopsis... A mid-level trough will overspread the western U.S. as upper ridging builds into the Plains states tomorrow (Monday). Another day of locally dry and breezy conditions is expected across the Great Basin, though widespread and longer-lasting winds/RH reaching Elevated criteria appears less likely. Thunderstorms, driven by strong forcing for ascent with this upper trough, will develop over the windward side of the Cascades and progress eastward through the day. However, fuels are most receptive toward the northern Rockies. Storms should approach the northern Rockies after dark, though it is unclear how dry they will be, and how much overlap will occur with the most receptive fuels, precluding isolated dry thunderstorm highlights this outlook. ..Squitieri.. 09/07/2025 ...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 0146 AM CDT Sun Sep 07 2025 Valid 081200Z - 091200Z ...NO CRITICAL AREAS... ...Synopsis... A mid-level trough will overspread the western U.S. as upper ridging builds into the Plains states tomorrow (Monday). Another day of locally dry and breezy conditions is expected across the Great Basin, though widespread and longer-lasting winds/RH reaching Elevated criteria appears less likely. Thunderstorms, driven by strong forcing for ascent with this upper trough, will develop over the windward side of the Cascades and progress eastward through the day. However, fuels are most receptive toward the northern Rockies. Storms should approach the northern Rockies after dark, though it is unclear how dry they will be, and how much overlap will occur with the most receptive fuels, precluding isolated dry thunderstorm highlights this outlook. ..Squitieri.. 09/07/2025 ...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 0139 AM CDT Sun Sep 07 2025 Valid 071200Z - 081200Z ...Synopsis... A mid-level trough will impinge on the West Coast while upper ridging persists over the Rockies today. The approach of this upper trough will encourage locally dry and breezy conditions across portions of the western and northern Great Basin, though these conditions should largely remain below Elevated thresholds. Upper support with this trough will also lift a buoyant airmass across eastern parts of the Pacific Northwest into the northern Rockies, where both a dry boundary layer (extending to over 700 mb) and dry fuels will overlap. Thunderstorms that develop within this regime will be both wet and dry and nature. However, the degree of fuel receptiveness over eastern parts of the Pacific Northwest into the northern Rockies suggests that lightning-induced ignitions may be efficient, warranting the continuance of isolated dry thunderstorm highlights. ..Squitieri.. 09/07/2025 ...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 0139 AM CDT Sun Sep 07 2025 Valid 071200Z - 081200Z ...Synopsis... A mid-level trough will impinge on the West Coast while upper ridging persists over the Rockies today. The approach of this upper trough will encourage locally dry and breezy conditions across portions of the western and northern Great Basin, though these conditions should largely remain below Elevated thresholds. Upper support with this trough will also lift a buoyant airmass across eastern parts of the Pacific Northwest into the northern Rockies, where both a dry boundary layer (extending to over 700 mb) and dry fuels will overlap. Thunderstorms that develop within this regime will be both wet and dry and nature. However, the degree of fuel receptiveness over eastern parts of the Pacific Northwest into the northern Rockies suggests that lightning-induced ignitions may be efficient, warranting the continuance of isolated dry thunderstorm highlights. ..Squitieri.. 09/07/2025 ...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 0139 AM CDT Sun Sep 07 2025 Valid 071200Z - 081200Z ...Synopsis... A mid-level trough will impinge on the West Coast while upper ridging persists over the Rockies today. The approach of this upper trough will encourage locally dry and breezy conditions across portions of the western and northern Great Basin, though these conditions should largely remain below Elevated thresholds. Upper support with this trough will also lift a buoyant airmass across eastern parts of the Pacific Northwest into the northern Rockies, where both a dry boundary layer (extending to over 700 mb) and dry fuels will overlap. Thunderstorms that develop within this regime will be both wet and dry and nature. However, the degree of fuel receptiveness over eastern parts of the Pacific Northwest into the northern Rockies suggests that lightning-induced ignitions may be efficient, warranting the continuance of isolated dry thunderstorm highlights. ..Squitieri.. 09/07/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more