SPC Day 1 Fire Weather Outlook

1 month 1 week ago
SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1143 PM CDT Tue Apr 08 2025 Valid 091200Z - 101200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE CENTRAL HIGH PLAINS... ...Synopsis... A mid-level trough will begin to amplify over the Ohio Valley as upper ridging builds in over the Interior West today. By afternoon, an 80+ kt 500 mb jet streak will overspread a dry boundary layer over the central/northern Plains. Downward momentum transport within this dry boundary layer will support 15-20 mph sustained northwesterly surface winds amid 20 percent RH. Given dry fuels across the central/northern Plains, Elevated highlights have been introduced where guidance consensus depicts the aforementioned dry/windy conditions persisting for several hours. Guidance consensus also depicts 20-25 mph sustained northwesterly surface winds coinciding with 10-15 percent RH across portions of the central High Plains, where Critical highlights are in place. Additionally, by afternoon, buoyancy (albeit scant) may support isolated, fast-moving/high-based thunderstorms over the same portions of the central Plains that will experience dry/windy surface conditions atop dry fuels. However, thunderstorms should be sparse at best over most areas, and it is unclear where a locally higher density of lightning flashes may occur, hence no isolated dry thunderstorms highlights introduced this outlook. ..Squitieri.. 04/09/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Apr 9, 2025 0100 UTC Day 1 Convective Outlook

1 month 1 week ago
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0755 PM CDT Tue Apr 08 2025 Valid 090100Z - 091200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Organized severe weather is not expected through Wednesday morning. Isolated strong storms remain possible over the next few hours in South Florida and the Keys as well as western South Dakota. ...Synopsis... A shortwave trough continues to approach the Florida Peninsula this evening. A weak surface boundary that is currently offshore may provide some focus for thunderstorms tonight. Another shortwave trough in Montana is responsible for isolated strong convection moving into western South Dakota. This activity may continue another couple of hours before weakening. ...South Dakota... The low-level airmass is quite dry; however, moisture is sufficient for isolated convection on the southern fringe of the shortwave trough. Small hail may occur with this activity, but the dry boundary layer is more likely to support strong to potentially marginally severe wind gusts. Activity should weaken over the next couple of hours and coverage will remain too isolated for adding severe probabilities. ...South Florida/Keys... The approach of the shortwave trough may promote a modest increase in convection along and near the surface boundary. Given diminishing surface temperatures and increase MLCIN, storms will become increasingly elevated with time. A strong gust could occur with the strongest storms, but this potential should remain spatially limited. ..Wendt.. 04/09/2025 Read more

SPC Day 3-8 Fire Weather Outlook

1 month 2 weeks ago
SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0457 PM CDT Tue Apr 08 2025 Valid 101200Z - 161200Z An amplifying mid-level trough will bring cooler temperatures and precipitation to much of the eastern U.S. through day 4/Friday. A strengthening high pressure ridge will promote potentially record setting heat across portions of the southwest desert and Intermountain regions beginning day 3/Thursday, lasting through the weekend (day 5 and 6). Model guidance consensus remains good in bringing an upper-level trough into the Pacific Northwest day 5/Saturday along with a subtropical jet component that should promote widespread Elevated to Critical fire weather conditions across the Desert Southwest on Saturday, spreading into the central and southern high Plains Sunday. Forecast uncertainty increases early next week but muted signals remain for at least some fire weather threat across portions of the southern Plains. ...Day 5/Saturday - Day 6/Sunday: Desert Southwest and High Plains... Critical fire weather conditions are possible across a large portions of the Desert Southwest on Day 5/Saturday in response to the encroaching upper-level trough into the Pacific Northwest and subtropical jet influence atop a very dry boundary layer and dry fuels. An area of 40 percent Critical probabilities was introduced for portions of southeast Arizona, where fuels will undergo several more days of drying, into much of New Mexico and southern Colorado for Saturday. Synoptically driven fire weather threat will continue for New Mexico but shift further into the central High Plains and front range of the Rockies as the trough translates eastward on day 6/Sunday. ..Moore/Williams.. 04/08/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook

1 month 2 weeks ago
SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0258 PM CDT Tue Apr 08 2025 Valid 091200Z - 101200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE CENTRAL HIGH PLAINS... Accelerating mid-level flow associated with an approaching 500 mb jet max will overspread the central Rockies, into the central High Plains tomorrow (Wednesday). This will promote stronger downslope west-northwest surface winds across portions of the central High Plains and adjacent front range areas. Although temperatures will be cooler owing to a post-frontal air mass, afternoon relative humidity is likely to fall to around 10 percent in a few locations. The dry air mass coupled with gusty winds and dry fuels is expected to generate Critical fire weather conditions across southeastern Wyoming extending southeastward into far northwestern Kansas. In addition, stronger northwest surface winds and relative humidity falling to the 20 to 30 percent range combined with sufficient available dry, fine fuels are expected tomorrow as well across a broad area from southeastern Montana into portions of South Dakota and far northwestern Iowa. Therefore, Elevated highlights were introduced to cover the heightened wildfire spread potential. ..Moore/Williams.. 04/08/2025 .PREV DISCUSSION... /ISSUED 1144 PM CDT Mon Apr 07 2025/ ...Synopsis... A mid-level trough will amplify over the central U.S., with an embedded 500 mb speed max poised to overspread the central Plains tomorrow (Wednesday). As surface high pressure builds over the northern Rockies, downslope flow across the central High Plains will promote another day of dry/windy conditions. 15-25 mph sustained westerly surface flow amid 20 percent RH will overspread dry fuels, warranting the introduction of Elevated highlights. Elsewhere across the central and southern High Plains, modestly dry and breezy conditions may develop and overspread fuels that have recently experienced appreciable precipitation accumulations, with no fire weather highlights introduced at this time. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook

1 month 2 weeks ago
SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0258 PM CDT Tue Apr 08 2025 Valid 091200Z - 101200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE CENTRAL HIGH PLAINS... Accelerating mid-level flow associated with an approaching 500 mb jet max will overspread the central Rockies, into the central High Plains tomorrow (Wednesday). This will promote stronger downslope west-northwest surface winds across portions of the central High Plains and adjacent front range areas. Although temperatures will be cooler owing to a post-frontal air mass, afternoon relative humidity is likely to fall to around 10 percent in a few locations. The dry air mass coupled with gusty winds and dry fuels is expected to generate Critical fire weather conditions across southeastern Wyoming extending southeastward into far northwestern Kansas. In addition, stronger northwest surface winds and relative humidity falling to the 20 to 30 percent range combined with sufficient available dry, fine fuels are expected tomorrow as well across a broad area from southeastern Montana into portions of South Dakota and far northwestern Iowa. Therefore, Elevated highlights were introduced to cover the heightened wildfire spread potential. ..Moore/Williams.. 04/08/2025 .PREV DISCUSSION... /ISSUED 1144 PM CDT Mon Apr 07 2025/ ...Synopsis... A mid-level trough will amplify over the central U.S., with an embedded 500 mb speed max poised to overspread the central Plains tomorrow (Wednesday). As surface high pressure builds over the northern Rockies, downslope flow across the central High Plains will promote another day of dry/windy conditions. 15-25 mph sustained westerly surface flow amid 20 percent RH will overspread dry fuels, warranting the introduction of Elevated highlights. Elsewhere across the central and southern High Plains, modestly dry and breezy conditions may develop and overspread fuels that have recently experienced appreciable precipitation accumulations, with no fire weather highlights introduced at this time. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Apr 8, 2025 2000 UTC Day 1 Convective Outlook

1 month 2 weeks ago
SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0246 PM CDT Tue Apr 08 2025 Valid 082000Z - 091200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... While organized severe storms are unlikely, isolated strong storms may occur over far southern Florida and the Keys through early evening, and perhaps also across southeast Montana to the Black Hills. ...20z Update... No changes in forecast reasoning since the prior Outlook. The cold front will continue to spread south-southeastward across southern Florida, with thunderstorms increasingly relegated to the far southeast part of the Peninsula, Keys, and Florida Straits. ..Guyer.. 04/08/2025 .PREV DISCUSSION... /ISSUED 1122 AM CDT Tue Apr 08 2025/ ...South Florida/Keys... A cold front will continue to progress southeastward and move offshore by evening with scattered showers and thunderstorms continuing this afternoon ahead of it. While a couple of stronger storms could occur this afternoon through early evening, poor mid-level lapse rates and weak deep-layer shear should mitigate overall storm strength. A positively tilted shortwave trough will approach the region later tonight. But with the front having progressed offshore, thunderstorm potential (including any severe risk) over land should remain very low. ...North-central High Plains.. A shortwave trough is forecast to move from the northern Rockies into the southern Canadian Prairies, while moderate mid-level flow expands eastward from the Pacific Northwest into the northern High Plains. Widely scattered high-based convection is possible during the afternoon and evening from southeast Montana/northern Wyoming to the Black Hills as modest large-scale ascent influences areas that have destabilized amid boundary-layer heating. Weak buoyancy should temper overall updraft strength, but a few instances of stronger/gusty thunderstorm winds may occur. Read more

SPC Apr 8, 2025 1930 UTC Day 3 Severe Thunderstorm Outlook

1 month 2 weeks ago
SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0207 PM CDT Tue Apr 08 2025 Valid 101200Z - 111200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS THE LOWER OHIO VALLEY...MID-MISSISSIPPI VALLEY...AND INTO THE MID-SOUTH... ...SUMMARY... Isolated severe storms capable of producing large hail and locally damaging gusts will be possible from the Lower Ohio River Valley to the Mid-Mississippi Valley and the Mid-South. ...Synopsis and Discussion... A mid-level trough will amplify across the eastern CONUS on Thursday with very cold mid-level temperatures (-22 to -26C at 500mb) expected from the Great Lakes to the Mid-South. These cold temperatures aloft will result in steep mid-level lapse rates which will support weak to potentially moderate instability by early-afternoon. Unidirectional flow, strengthening with height, will support storm organization including updraft rotation. Overall, the dry airmass, and thus relatively weak instability, should limit a greater threat. However, cold temperatures aloft and forecast soundings showing a deeply mixed boundary layer will support the potential for some large hail and damaging wind gusts. The greatest threat for stronger supercells will exist along the cold front during peak heating (likely eastern Arkansas to northern Alabama and southern Tennessee) where better moisture/instability should be present. Despite a drier airmass farther north and east, the coldest air aloft will advect over this region and could support a threat as far northeast as far southern Ohio. ..Bentley.. 04/08/2025 Read more

SPC Apr 8, 2025 1730 UTC Day 2 Convective Outlook

1 month 2 weeks ago
SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1212 PM CDT Tue Apr 08 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are possible across portions of the Midwest, the Upper Midwest, and the northern High Plains, though severe storms are not expected. ...Synopsis and Discussion... A midlevel trough will amplify as it advances southeastward from the northern Plains into the Midwest on Wednesday, while a surface low will develop over Missouri and moves into the Lower Ohio Valley. A cold front will extend southwestward from this surface low with a warm front to the northeast. Despite limited boundary-layer moisture, steep midlevel lapse rates will yield sufficient instability (albeit weak) for isolated thunderstorms along the warm front during the evening/overnight hours. Some thunderstorms may develop along the cold front where slightly greater instability is forecast. Locally strong gusts cannot be ruled out, but the weak instability should limit storm intensity. Isolated thunderstorms are expected across the northern Plains and Upper Midwest as a mid-level trough amplifies and moves south and a mid-level jet streak overspreads the region. ..Bentley.. 04/08/2025 Read more

SPC Apr 8, 2025 1730 UTC Day 2 Convective Outlook

1 month 2 weeks ago
SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1212 PM CDT Tue Apr 08 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are possible across portions of the Midwest, the Upper Midwest, and the northern High Plains, though severe storms are not expected. ...Synopsis and Discussion... A midlevel trough will amplify as it advances southeastward from the northern Plains into the Midwest on Wednesday, while a surface low will develop over Missouri and moves into the Lower Ohio Valley. A cold front will extend southwestward from this surface low with a warm front to the northeast. Despite limited boundary-layer moisture, steep midlevel lapse rates will yield sufficient instability (albeit weak) for isolated thunderstorms along the warm front during the evening/overnight hours. Some thunderstorms may develop along the cold front where slightly greater instability is forecast. Locally strong gusts cannot be ruled out, but the weak instability should limit storm intensity. Isolated thunderstorms are expected across the northern Plains and Upper Midwest as a mid-level trough amplifies and moves south and a mid-level jet streak overspreads the region. ..Bentley.. 04/08/2025 Read more

SPC Day 1 Fire Weather Outlook

1 month 2 weeks ago
SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1131 AM CDT Tue Apr 08 2025 Valid 081700Z - 091200Z The previous forecast (see below) remains on track. Gusty downslope winds from the west-northwest along with relative humidity dropping to around 15 percent are likely this afternoon. These Elevated fire weather conditions will couple with receptive fuels to magnify wildfire spread potential across portions of the central High Plains. ..Moore/Williams.. 04/08/2025 .PREV DISCUSSION... /ISSUED 1141 PM CDT Mon Apr 07 2025/ ...Synopsis... Zonal flow will become established across the CONUS, with multiple embedded impulses expected to progress eastward within the zonal flow regime. One such mid-level impulse will overspread the central Rockies this afternoon, supporting surface cyclone development over the Plains states. Downslope flow is likely over the central High Plains, with the latest guidance consensus showing 15-25 mph sustained westerly surface winds coinciding with 20 percent RH, warranting the maintenance of Elevated highlights given modestly dry fuels. Occasionally dry and windy conditions are also possible across portions of the central and southern High Plains, though recent appreciable precipitation accumulations have dampened fuels, precluding fire weather highlights. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Apr 8, 2025 1630 UTC Day 1 Convective Outlook

1 month 2 weeks ago
SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1122 AM CDT Tue Apr 08 2025 Valid 081630Z - 091200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... While organized severe storms are unlikely, isolated strong storms may occur over far southern Florida and the Keys through early evening, and perhaps also across southeast Montana to the Black Hills. ...South Florida/Keys... A cold front will continue to progress southeastward and move offshore by evening with scattered showers and thunderstorms continuing this afternoon ahead of it. While a couple of stronger storms could occur this afternoon through early evening, poor mid-level lapse rates and weak deep-layer shear should mitigate overall storm strength. A positively tilted shortwave trough will approach the region later tonight. But with the front having progressed offshore, thunderstorm potential (including any severe risk) over land should remain very low. ...North-central High Plains.. A shortwave trough is forecast to move from the northern Rockies into the southern Canadian Prairies, while moderate mid-level flow expands eastward from the Pacific Northwest into the northern High Plains. Widely scattered high-based convection is possible during the afternoon and evening from southeast Montana/northern Wyoming to the Black Hills as modest large-scale ascent influences areas that have destabilized amid boundary-layer heating. Weak buoyancy should temper overall updraft strength, but a few instances of stronger/gusty thunderstorm winds may occur. ..Guyer/Lyons.. 04/08/2025 Read more

SPC Apr 8, 2025 1300 UTC Day 1 Convective Outlook

1 month 2 weeks ago
SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0730 AM CDT Tue Apr 08 2025 Valid 081300Z - 091200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated strong storms may occur over far southern Florida and the Keys today into Wednesday morning, and from southeast Montana to the Black Hills. ...Synopsis and Discussion... A slow-moving cold front continues to push southward across central FL. This front is expected to continue southward throughout the day, progressing through South FL and offshore by this evening. Isolated showers and thunderstorms are anticipated in the vicinity of this boundary, but poor lapse rates and weak shear should mitigate overall storm strength. A positively tilted shortwave trough is expected to track eastward across the Gulf today, reaching the FL Peninsula by early Wednesday morning. A post-frontal airmass will exist across the peninsula whenever this shortwave arrives, which will keep thunderstorm chances over land very low. Farther north and west, a shortwave trough is forecast to move from the northern Rockies into the southern Canadian Prairies, while moderate mid-level flow expands eastward from the Pacific Northwest into the northern High Plains. Some high-based convection is possible during the afternoon and evening from southeast MT/northern WY into the Black Hills as modest large-scale ascent occurs over regions that have destabilized amid boundary-layer heating. Weak buoyancy should temper overall updraft strength, but a few gusty downdrafts are possible. ..Mosier/Kerr.. 04/08/2025 Read more

SPC Apr 8, 2025 Day 4-8 Severe Weather Outlook

1 month 2 weeks ago
Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0337 AM CDT Tue Apr 08 2025 Valid 111200Z - 161200Z ...DISCUSSION... On Day 4/Friday, an amplified large-scale trough will move slowly eastward across the Appalachians. Ahead of a related surface low in the lee of the Appalachians, weakly modified boundary-layer moisture will be in place across the coastal Mid-Atlantic states. While instability will be marginal, owing to the limited moisture and poor lapse rates, strong south-southwesterly midlevel flow may support a couple strong storms during the afternoon. The overall severe threat appears too marginal for severe probabilities at this time. By Day 6/Sunday, a midlevel trough will advance eastward across the northern/central Plains, while an elongated downstream surface trough (with embedded surface lows) promotes partially modified Gulf moisture return across the southern/central Plains and MS Valley. Despite multiple surface boundaries across the Plains, current indications are that a strong EML and related capping atop the limited boundary-layer moisture should inhibit surface-based thunderstorm potential. Thereafter, medium-range guidance varies considerably regarding the timing and evolution of the aforementioned midlevel trough and associated warm sector -- limiting confidence in severe-storm potential for Days 7-8/Monday-Tuesday. Read more

SPC Apr 8, 2025 0730 UTC Day 3 Severe Thunderstorm Outlook

1 month 2 weeks ago
SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0218 AM CDT Tue Apr 08 2025 Valid 101200Z - 111200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE TENNESSEE VALLEY... ...SUMMARY... Isolated severe storms capable of producing large hail and locally damaging gusts will be possible across portions of the Tennessee Valley on Thursday afternoon and evening. ...Synopsis... A positively tilted large-scale trough and accompanying midlevel speed maximum will move southeastward from the Middle/Upper MS Valley to the southern Appalachians through the period. At the same time, a weak surface low will drift east-southeastward from the Midwest into the central Appalachians, while a related cold front overspreads the TN Valley during the afternoon/evening. ...Tennessee Valley... Aided by strengthening DCVA in the left-exit region of the midlevel jet, isolated to widely scattered thunderstorms are expected along the cold front as it moves southeastward across the TN Valley during the afternoon and evening hours. Beneath steepening midlevel lapse rates, diurnal heating of a partially modified Gulf air mass will yield upwards of 1000 J/kg MUCAPE along the front. Despite the somewhat marginal buoyancy, 50-60 kt of effective shear (characterized by a long/straight hodograph) will support a few organized/rotating storms -- both ahead of and behind the southward-moving front. Weak/veered low-level flow will generally limit the strength of forcing along the front, which should favor a semi-discrete mode and the potential for large hail and locally damaging gusts. ..Weinman.. 04/08/2025 Read more

SPC Apr 8, 2025 0730 UTC Day 3 Severe Thunderstorm Outlook

1 month 2 weeks ago
SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0218 AM CDT Tue Apr 08 2025 Valid 101200Z - 111200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE TENNESSEE VALLEY... ...SUMMARY... Isolated severe storms capable of producing large hail and locally damaging gusts will be possible across portions of the Tennessee Valley on Thursday afternoon and evening. ...Synopsis... A positively tilted large-scale trough and accompanying midlevel speed maximum will move southeastward from the Middle/Upper MS Valley to the southern Appalachians through the period. At the same time, a weak surface low will drift east-southeastward from the Midwest into the central Appalachians, while a related cold front overspreads the TN Valley during the afternoon/evening. ...Tennessee Valley... Aided by strengthening DCVA in the left-exit region of the midlevel jet, isolated to widely scattered thunderstorms are expected along the cold front as it moves southeastward across the TN Valley during the afternoon and evening hours. Beneath steepening midlevel lapse rates, diurnal heating of a partially modified Gulf air mass will yield upwards of 1000 J/kg MUCAPE along the front. Despite the somewhat marginal buoyancy, 50-60 kt of effective shear (characterized by a long/straight hodograph) will support a few organized/rotating storms -- both ahead of and behind the southward-moving front. Weak/veered low-level flow will generally limit the strength of forcing along the front, which should favor a semi-discrete mode and the potential for large hail and locally damaging gusts. ..Weinman.. 04/08/2025 Read more

SPC Apr 8, 2025 0600 UTC Day 2 Convective Outlook

1 month 2 weeks ago
SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1219 AM CDT Tue Apr 08 2025 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are possible across portions of the the Middle Mississippi Valley and northern High Plains, though severe storms are not expected. ...Synopsis and Discussion... A midlevel trough will amplify as it advances southeastward from the northern Plains into the Midwest, while a related surface low and southwestward-extending cold front overspread the Mid MS/OH Valleys. Despite limited boundary-layer moisture, steep midlevel lapse rates will yield sufficient instability (albeit weak) for isolated thunderstorms along the front during the evening/overnight hours. While locally strong gusts cannot be ruled out, the weak instability should limit storm intensity. Farther west, ascent in the left-exit region of a southeastward-moving upper-level jet, combined with steep deep-layer lapse rates/marginal instability, will support isolated thunderstorms across the northern and central Plains. ..Weinman.. 04/08/2025 Read more

SPC Apr 8, 2025 0600 UTC Day 1 Convective Outlook

1 month 2 weeks ago
SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1215 AM CDT Tue Apr 08 2025 Valid 081200Z - 091200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated strong storms may occur over far southern Florida and the Keys tonight into Wednesday morning, and from southeast Montana to the Black Hills. ...Synopsis... A positive-tilt trough in the western Gulf will slide eastward through the day. This trough will eventually reach the Florida Peninsula late tonight into Wednesday morning. In the West, an upper ridge will build with the strongest flow aloft situated over the Northwest into the northern Rockies and adjacent High Plains. At the surface, a weak cold front across South Florida will be a focus for convection. ...South Florida/Keys... Showers and thunderstorms are expected to be ongoing early this morning in central/South Florida. This activity and associated cloud cover should limit/slow destabilization along the weakly convergent front. Where greater heating can occur, a stronger storm or two would be possible. Given weak low-level lapse rates and wind fields, gusty winds would be the likely hazards from this activity. Mid-level lapse rates will also be poor and large hail does not appear likely. Convection during the afternoon will likely struggle to organize as effective shear will be 25 kts or less. By late afternoon into the evening, stronger flow aloft will reach the Keys/far South Florida. By this time, however, buoyancy will be weakening and storms are not likely to be surface based. ...Southeast Montana into the Black Hills... Despite limited moisture, thunderstorm development within the higher terrain of Montana is possible with embedded shortwave perturbations passing through the region. Steep low/mid-level lapse rates and strong shear may promote a few stronger storms capable of small hail and strong outflow winds during the afternoon and early evening. Weak buoyancy will limit storm intensity. ..Wendt/Squitieri.. 04/08/2025 Read more

SPC Day 2 Fire Weather Outlook

1 month 2 weeks ago
SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1144 PM CDT Mon Apr 07 2025 Valid 091200Z - 101200Z ...Synopsis... A mid-level trough will amplify over the central U.S., with an embedded 500 mb speed max poised to overspread the central Plains tomorrow (Wednesday). As surface high pressure builds over the northern Rockies, downslope flow across the central High Plains will promote another day of dry/windy conditions. 15-25 mph sustained westerly surface flow amid 20 percent RH will overspread dry fuels, warranting the introduction of Elevated highlights. Elsewhere across the central and southern High Plains, modestly dry and breezy conditions may develop and overspread fuels that have recently experienced appreciable precipitation accumulations, with no fire weather highlights introduced at this time. ..Squitieri.. 04/08/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more
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