Severe Storms

WW 0442 Status Updates
140- STATUS REPORT ON WW 442 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 W HGR TO 25 SSW CXY TO 40 ENE CXY TO 10 WSW AVP. ..WENDT..06/19/25 ATTN...WFO...LWX...PHI...AKQ...RNK...CTP... STATUS REPORT FOR WS 442 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS DEC001-003-005-192140- DE . DELAWARE COUNTIES INCLUDED ARE KENT NEW CASTLE SUSSEX DCC001-192140- DC . DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE DISTRICT OF COLUMBIA MDC003-005-009-011-013-015-017-019-021-025-027-029-031-033-035- 037-039-041-043-045-510-192140- MD . MARYLAND COUNTIES INCLUDED ARE ANNE ARUNDEL BALTIMORE CALVERT CAROLINE CARROLL CECIL Read more

WW 0442 Status Updates
140- STATUS REPORT ON WW 442 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 W HGR TO 25 SSW CXY TO 40 ENE CXY TO 10 WSW AVP. ..WENDT..06/19/25 ATTN...WFO...LWX...PHI...AKQ...RNK...CTP... STATUS REPORT FOR WS 442 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS DEC001-003-005-192140- DE . DELAWARE COUNTIES INCLUDED ARE KENT NEW CASTLE SUSSEX DCC001-192140- DC . DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE DISTRICT OF COLUMBIA MDC003-005-009-011-013-015-017-019-021-025-027-029-031-033-035- 037-039-041-043-045-510-192140- MD . MARYLAND COUNTIES INCLUDED ARE ANNE ARUNDEL BALTIMORE CALVERT CAROLINE CARROLL CECIL Read more

MD 1369 CONCERNING SEVERE THUNDERSTORM WATCH 442... FOR SOUTH-CENTRAL VIRGINIA INTO CENTRAL/EASTERN MARYLAND AND SOUTHEAST PENNSYLVANIA
Mesoscale Discussion 1369 NWS Storm Prediction Center Norman OK 0222 PM CDT Thu Jun 19 2025 Areas affected...South-central Virginia into central/eastern Maryland and southeast Pennsylvania Concerning...Severe Thunderstorm Watch 442... Valid 191922Z - 192115Z The severe weather threat for Severe Thunderstorm Watch 442 continues. SUMMARY...Strong to severe winds are the primary threat this afternoon, particularly with linear segments. The environment in the DC/Baltimore/Philadelphia remains favorable. DISCUSSION...Strong to isolated severe wind gusts have occurred with storms just east of the Blue Ridge this afternoon. Given the linear structures that have evolved in northern Virginia and central Maryland, areas ahead of this activity will have a greater risk for strong/damaging winds. Temperatures in Virginia and Maryland have risen into the low 90s F with upper 80s F into southeast Pennsylvania. Steep low-level lapse rates and 1500-2000 J/kg MLCAPE will support a continued threat for strong to severe wind gusts as storms move towards the DC/Baltimore/Philadelphia corridor. ..Wendt.. 06/19/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...PHI...AKQ...CTP...LWX...RNK... LAT...LON 36827957 38467870 40187709 40417564 40277485 39967494 39577525 37937647 37037771 36827957 MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH MOST PROBABLE PEAK WIND GUST...55-70 MPH Read more

WW 0441 Status Updates
STATUS REPORT ON WW 441 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NNW TTN TO 30 NE MSV TO 10 SSE UCA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1370 ..WENDT..06/19/25 ATTN...WFO...OKX...BOX...ALY...BGM...BTV... STATUS REPORT FOR WS 441 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS CTC001-003-005-007-009-013-015-192140- CT . CONNECTICUT COUNTIES INCLUDED ARE FAIRFIELD HARTFORD LITCHFIELD MIDDLESEX NEW HAVEN TOLLAND WINDHAM MAC003-011-013-015-027-192140- MA . MASSACHUSETTS COUNTIES INCLUDED ARE BERKSHIRE FRANKLIN HAMPDEN HAMPSHIRE WORCESTER NJC003-013-017-031-039-192140- NJ . NEW JERSEY COUNTIES INCLUDED ARE Read more

WW 0441 Status Updates
STATUS REPORT ON WW 441 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NNW TTN TO 30 NE MSV TO 10 SSE UCA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1370 ..WENDT..06/19/25 ATTN...WFO...OKX...BOX...ALY...BGM...BTV... STATUS REPORT FOR WS 441 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS CTC001-003-005-007-009-013-015-192140- CT . CONNECTICUT COUNTIES INCLUDED ARE FAIRFIELD HARTFORD LITCHFIELD MIDDLESEX NEW HAVEN TOLLAND WINDHAM MAC003-011-013-015-027-192140- MA . MASSACHUSETTS COUNTIES INCLUDED ARE BERKSHIRE FRANKLIN HAMPDEN HAMPSHIRE WORCESTER NJC003-013-017-031-039-192140- NJ . NEW JERSEY COUNTIES INCLUDED ARE Read more

WW 0443 Status Updates
STATUS REPORT ON WW 443 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1370 ..WENDT..06/19/25 ATTN...WFO...GYX...CAR... STATUS REPORT FOR WS 443 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC001-003-005-007-011-017-021-023-025-031-192140- ME . MAINE COUNTIES INCLUDED ARE ANDROSCOGGIN AROOSTOOK CUMBERLAND FRANKLIN KENNEBEC OXFORD PISCATAQUIS SAGADAHOC SOMERSET YORK NHC001-003-005-007-009-011-013-015-017-019-192140- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE BELKNAP CARROLL CHESHIRE COOS GRAFTON HILLSBOROUGH MERRIMACK ROCKINGHAM STRAFFORD SULLIVAN THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL Read more

WW 0443 Status Updates
STATUS REPORT ON WW 443 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1370 ..WENDT..06/19/25 ATTN...WFO...GYX...CAR... STATUS REPORT FOR WS 443 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC001-003-005-007-011-017-021-023-025-031-192140- ME . MAINE COUNTIES INCLUDED ARE ANDROSCOGGIN AROOSTOOK CUMBERLAND FRANKLIN KENNEBEC OXFORD PISCATAQUIS SAGADAHOC SOMERSET YORK NHC001-003-005-007-009-011-013-015-017-019-192140- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE BELKNAP CARROLL CHESHIRE COOS GRAFTON HILLSBOROUGH MERRIMACK ROCKINGHAM STRAFFORD SULLIVAN THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL Read more

WW 0443 Status Updates
STATUS REPORT ON WW 443 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1370 ..WENDT..06/19/25 ATTN...WFO...GYX...CAR... STATUS REPORT FOR WS 443 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC001-003-005-007-011-017-021-023-025-031-192140- ME . MAINE COUNTIES INCLUDED ARE ANDROSCOGGIN AROOSTOOK CUMBERLAND FRANKLIN KENNEBEC OXFORD PISCATAQUIS SAGADAHOC SOMERSET YORK NHC001-003-005-007-009-011-013-015-017-019-192140- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE BELKNAP CARROLL CHESHIRE COOS GRAFTON HILLSBOROUGH MERRIMACK ROCKINGHAM STRAFFORD SULLIVAN THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL Read more

MD 1367 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR UPPER OHIO VALLEY VICINITY
Mesoscale Discussion 1367 NWS Storm Prediction Center Norman OK 0117 PM CDT Thu Jun 19 2025 Areas affected...Upper Ohio Valley Vicinity Concerning...Severe potential...Watch unlikely Valid 191817Z - 192015Z Probability of Watch Issuance...20 percent SUMMARY...Widely scattered strong to near-severe gusts may produce wind damage this afternoon. Weak thermodynamics should limit a more widespread/organized threat this afternoon. DISCUSSION...Stronger forcing from the upper trough as well as the surface cold front has promoted thunderstorm development in the upper Ohio Valley region. Recent surface observations show a 46 kt gust in Parkersburg, WV along with a few wind damage reports. Given the enhanced low-level winds near the surface low, additional strong to near-severe winds are possible through the afternoon. The greatest threat will be with linear segments moving east through West Virginia. Marginal low-level and mid-level lapse rates should keep the threat less organized and more sporadic in nature. ..Wendt/Hart.. 06/19/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...CTP...LWX...PBZ...RLX...CLE...JKL...ILN... LAT...LON 37848376 39758164 39868165 40758093 41048037 40617905 40077906 39387962 38128102 37588199 37428371 37848376 MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...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 0258 PM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Great Basin into the Southwest... A prominent low pressure system and associated 60-70 mph mid-level jet entering the northwestern U.S. will promote an expansive area of critical fire weather conditions across much of the Great Basin, northern Arizona and Four Corners area on Friday. The pronounced juxtaposition of a mid-level jet maxima, a deep and well-mixed boundary layer and surface relative humidity of 10 percent or below is expected across eastern Utah and western Colorado. The combination of sustained winds of 25-30 mph and very dry surface layer could yield locally extremely critical fire weather conditions across western portions of the Colorado Plateau Friday. ...Southern California into the San Joaquin Valley... Enhanced west-northwest flow and within a dry boundary layer will support an elevated fire weather threat mainly leeward of interior mountain ranges across Southern California Friday. Previous forecast (see below) remains on track. ..Williams.. 06/19/2025 .PREV DISCUSSION... /ISSUED 0209 AM CDT Thu Jun 19 2025/ ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ...Please see www.spc.noaa.gov/fire for graphic product... Read more