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SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0642 AM CST Mon Jan 20 2025 Valid 201300Z - 211200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No thunderstorms are expected across the U.S. through tonight. Relatively dry and stable conditions will prevail across the CONUS today, with no thunderstorms expected. ..Hart/Wendt.. 01/20/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0642 AM CST Mon Jan 20 2025 Valid 201300Z - 211200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No thunderstorms are expected across the U.S. through tonight. Relatively dry and stable conditions will prevail across the CONUS today, with no thunderstorms expected. ..Hart/Wendt.. 01/20/2025 Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0342 AM CST Mon Jan 20 2025 Valid 231200Z - 281200Z ...DISCUSSION... For Thursday/D4 into Friday/D5, a large positive-tilt upper trough will move from central parts of the CONUS toward the East Coast, exiting land late Friday. Although strong winds aloft will overspread the southeastern states, northerly winds are forecast to hold over land. Behind that system, high pressure will maintain stable conditions over the eastern CONUS into Saturday/D6, although more of a zonal flow regime is forecast thereafter. As a result of this possible transition to the pattern, minimal low-level moisture return with low 60s F dewpoints may return to parts of the TX Coast as surface pressure lowers briefly. Beyond the D6 time frame, model spread is large, but the general signal is for the ongoing large trough pattern over the central and eastern CONUS to at least shift northeastward into eastern Canada and the northeastern states, allowing for gradual warming across the South. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0342 AM CST Mon Jan 20 2025 Valid 231200Z - 281200Z ...DISCUSSION... For Thursday/D4 into Friday/D5, a large positive-tilt upper trough will move from central parts of the CONUS toward the East Coast, exiting land late Friday. Although strong winds aloft will overspread the southeastern states, northerly winds are forecast to hold over land. Behind that system, high pressure will maintain stable conditions over the eastern CONUS into Saturday/D6, although more of a zonal flow regime is forecast thereafter. As a result of this possible transition to the pattern, minimal low-level moisture return with low 60s F dewpoints may return to parts of the TX Coast as surface pressure lowers briefly. Beyond the D6 time frame, model spread is large, but the general signal is for the ongoing large trough pattern over the central and eastern CONUS to at least shift northeastward into eastern Canada and the northeastern states, allowing for gradual warming across the South. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0342 AM CST Mon Jan 20 2025 Valid 231200Z - 281200Z ...DISCUSSION... For Thursday/D4 into Friday/D5, a large positive-tilt upper trough will move from central parts of the CONUS toward the East Coast, exiting land late Friday. Although strong winds aloft will overspread the southeastern states, northerly winds are forecast to hold over land. Behind that system, high pressure will maintain stable conditions over the eastern CONUS into Saturday/D6, although more of a zonal flow regime is forecast thereafter. As a result of this possible transition to the pattern, minimal low-level moisture return with low 60s F dewpoints may return to parts of the TX Coast as surface pressure lowers briefly. Beyond the D6 time frame, model spread is large, but the general signal is for the ongoing large trough pattern over the central and eastern CONUS to at least shift northeastward into eastern Canada and the northeastern states, allowing for gradual warming across the South. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0342 AM CST Mon Jan 20 2025 Valid 231200Z - 281200Z ...DISCUSSION... For Thursday/D4 into Friday/D5, a large positive-tilt upper trough will move from central parts of the CONUS toward the East Coast, exiting land late Friday. Although strong winds aloft will overspread the southeastern states, northerly winds are forecast to hold over land. Behind that system, high pressure will maintain stable conditions over the eastern CONUS into Saturday/D6, although more of a zonal flow regime is forecast thereafter. As a result of this possible transition to the pattern, minimal low-level moisture return with low 60s F dewpoints may return to parts of the TX Coast as surface pressure lowers briefly. Beyond the D6 time frame, model spread is large, but the general signal is for the ongoing large trough pattern over the central and eastern CONUS to at least shift northeastward into eastern Canada and the northeastern states, allowing for gradual warming across the South. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0342 AM CST Mon Jan 20 2025 Valid 231200Z - 281200Z ...DISCUSSION... For Thursday/D4 into Friday/D5, a large positive-tilt upper trough will move from central parts of the CONUS toward the East Coast, exiting land late Friday. Although strong winds aloft will overspread the southeastern states, northerly winds are forecast to hold over land. Behind that system, high pressure will maintain stable conditions over the eastern CONUS into Saturday/D6, although more of a zonal flow regime is forecast thereafter. As a result of this possible transition to the pattern, minimal low-level moisture return with low 60s F dewpoints may return to parts of the TX Coast as surface pressure lowers briefly. Beyond the D6 time frame, model spread is large, but the general signal is for the ongoing large trough pattern over the central and eastern CONUS to at least shift northeastward into eastern Canada and the northeastern states, allowing for gradual warming across the South. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0342 AM CST Mon Jan 20 2025 Valid 231200Z - 281200Z ...DISCUSSION... For Thursday/D4 into Friday/D5, a large positive-tilt upper trough will move from central parts of the CONUS toward the East Coast, exiting land late Friday. Although strong winds aloft will overspread the southeastern states, northerly winds are forecast to hold over land. Behind that system, high pressure will maintain stable conditions over the eastern CONUS into Saturday/D6, although more of a zonal flow regime is forecast thereafter. As a result of this possible transition to the pattern, minimal low-level moisture return with low 60s F dewpoints may return to parts of the TX Coast as surface pressure lowers briefly. Beyond the D6 time frame, model spread is large, but the general signal is for the ongoing large trough pattern over the central and eastern CONUS to at least shift northeastward into eastern Canada and the northeastern states, allowing for gradual warming across the South. Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0208 AM CST Mon Jan 20 2025 Valid 211200Z - 221200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE EASTERN SAN DIEGO FOOTHILLS INTO THE WESTERN SAN JACINTO MOUNTAINS... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... A strong Santa Ana wind event beginning Monday afternoon will persist well into Tuesday afternoon and evening, resulting in widespread Critical and Extremely Critical fire-weather conditions across much of Southern California. ...Extremely Critical fire-weather conditions for the San Gabriel, Santa Monica, and Santa Susana Mountains... Extremely Critical fire-weather conditions will persist from the Day 1 outlook period (Mon) well into Day 2 (Tues). Sustained winds of 40-45 MPH (gusting 70-100 MPH on mountains, 50-80 MPH in the valleys/coastal regions) with single-digit relative humidity values as low as 2%-5% will be ongoing at the start of the period, subsiding by late Tuesday afternoon/early Tuesday evening. For more details, see the current Day 1 fire-weather outlook. ...Extremely Critical fire-weather conditions for portions of the eastern San Diego foothills into the western San Jacinto Mountains... Confidence has increased in strong, dry offshore flow across far Southern California, particularly portions of the eastern San Diego foothills into the San Jacinto Mountains. Recent 00Z HREF guidance shows ensemble mean sustained surface winds as high as 50-55 MPH, with the ensemble maximum as high as 60 MPH and gusts as high as 80 MPH. Coupled with single-digit relative humidities, this will result in several hours of Extremely Critical fire-weather conditions supportive of rapid wildfire onset and spread, subsiding by late Tuesday evening into Wednesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 211200Z - 221200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE EASTERN SAN DIEGO FOOTHILLS INTO THE WESTERN SAN JACINTO MOUNTAINS... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... A strong Santa Ana wind event beginning Monday afternoon will persist well into Tuesday afternoon and evening, resulting in widespread Critical and Extremely Critical fire-weather conditions across much of Southern California. ...Extremely Critical fire-weather conditions for the San Gabriel, Santa Monica, and Santa Susana Mountains... Extremely Critical fire-weather conditions will persist from the Day 1 outlook period (Mon) well into Day 2 (Tues). Sustained winds of 40-45 MPH (gusting 70-100 MPH on mountains, 50-80 MPH in the valleys/coastal regions) with single-digit relative humidity values as low as 2%-5% will be ongoing at the start of the period, subsiding by late Tuesday afternoon/early Tuesday evening. For more details, see the current Day 1 fire-weather outlook. ...Extremely Critical fire-weather conditions for portions of the eastern San Diego foothills into the western San Jacinto Mountains... Confidence has increased in strong, dry offshore flow across far Southern California, particularly portions of the eastern San Diego foothills into the San Jacinto Mountains. Recent 00Z HREF guidance shows ensemble mean sustained surface winds as high as 50-55 MPH, with the ensemble maximum as high as 60 MPH and gusts as high as 80 MPH. Coupled with single-digit relative humidities, this will result in several hours of Extremely Critical fire-weather conditions supportive of rapid wildfire onset and spread, subsiding by late Tuesday evening into Wednesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 211200Z - 221200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE EASTERN SAN DIEGO FOOTHILLS INTO THE WESTERN SAN JACINTO MOUNTAINS... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... A strong Santa Ana wind event beginning Monday afternoon will persist well into Tuesday afternoon and evening, resulting in widespread Critical and Extremely Critical fire-weather conditions across much of Southern California. ...Extremely Critical fire-weather conditions for the San Gabriel, Santa Monica, and Santa Susana Mountains... Extremely Critical fire-weather conditions will persist from the Day 1 outlook period (Mon) well into Day 2 (Tues). Sustained winds of 40-45 MPH (gusting 70-100 MPH on mountains, 50-80 MPH in the valleys/coastal regions) with single-digit relative humidity values as low as 2%-5% will be ongoing at the start of the period, subsiding by late Tuesday afternoon/early Tuesday evening. For more details, see the current Day 1 fire-weather outlook. ...Extremely Critical fire-weather conditions for portions of the eastern San Diego foothills into the western San Jacinto Mountains... Confidence has increased in strong, dry offshore flow across far Southern California, particularly portions of the eastern San Diego foothills into the San Jacinto Mountains. Recent 00Z HREF guidance shows ensemble mean sustained surface winds as high as 50-55 MPH, with the ensemble maximum as high as 60 MPH and gusts as high as 80 MPH. Coupled with single-digit relative humidities, this will result in several hours of Extremely Critical fire-weather conditions supportive of rapid wildfire onset and spread, subsiding by late Tuesday evening into Wednesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 211200Z - 221200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE EASTERN SAN DIEGO FOOTHILLS INTO THE WESTERN SAN JACINTO MOUNTAINS... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... A strong Santa Ana wind event beginning Monday afternoon will persist well into Tuesday afternoon and evening, resulting in widespread Critical and Extremely Critical fire-weather conditions across much of Southern California. ...Extremely Critical fire-weather conditions for the San Gabriel, Santa Monica, and Santa Susana Mountains... Extremely Critical fire-weather conditions will persist from the Day 1 outlook period (Mon) well into Day 2 (Tues). Sustained winds of 40-45 MPH (gusting 70-100 MPH on mountains, 50-80 MPH in the valleys/coastal regions) with single-digit relative humidity values as low as 2%-5% will be ongoing at the start of the period, subsiding by late Tuesday afternoon/early Tuesday evening. For more details, see the current Day 1 fire-weather outlook. ...Extremely Critical fire-weather conditions for portions of the eastern San Diego foothills into the western San Jacinto Mountains... Confidence has increased in strong, dry offshore flow across far Southern California, particularly portions of the eastern San Diego foothills into the San Jacinto Mountains. Recent 00Z HREF guidance shows ensemble mean sustained surface winds as high as 50-55 MPH, with the ensemble maximum as high as 60 MPH and gusts as high as 80 MPH. Coupled with single-digit relative humidities, this will result in several hours of Extremely Critical fire-weather conditions supportive of rapid wildfire onset and spread, subsiding by late Tuesday evening into Wednesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 211200Z - 221200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE EASTERN SAN DIEGO FOOTHILLS INTO THE WESTERN SAN JACINTO MOUNTAINS... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... A strong Santa Ana wind event beginning Monday afternoon will persist well into Tuesday afternoon and evening, resulting in widespread Critical and Extremely Critical fire-weather conditions across much of Southern California. ...Extremely Critical fire-weather conditions for the San Gabriel, Santa Monica, and Santa Susana Mountains... Extremely Critical fire-weather conditions will persist from the Day 1 outlook period (Mon) well into Day 2 (Tues). Sustained winds of 40-45 MPH (gusting 70-100 MPH on mountains, 50-80 MPH in the valleys/coastal regions) with single-digit relative humidity values as low as 2%-5% will be ongoing at the start of the period, subsiding by late Tuesday afternoon/early Tuesday evening. For more details, see the current Day 1 fire-weather outlook. ...Extremely Critical fire-weather conditions for portions of the eastern San Diego foothills into the western San Jacinto Mountains... Confidence has increased in strong, dry offshore flow across far Southern California, particularly portions of the eastern San Diego foothills into the San Jacinto Mountains. Recent 00Z HREF guidance shows ensemble mean sustained surface winds as high as 50-55 MPH, with the ensemble maximum as high as 60 MPH and gusts as high as 80 MPH. Coupled with single-digit relative humidities, this will result in several hours of Extremely Critical fire-weather conditions supportive of rapid wildfire onset and spread, subsiding by late Tuesday evening into Wednesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 211200Z - 221200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE EASTERN SAN DIEGO FOOTHILLS INTO THE WESTERN SAN JACINTO MOUNTAINS... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... A strong Santa Ana wind event beginning Monday afternoon will persist well into Tuesday afternoon and evening, resulting in widespread Critical and Extremely Critical fire-weather conditions across much of Southern California. ...Extremely Critical fire-weather conditions for the San Gabriel, Santa Monica, and Santa Susana Mountains... Extremely Critical fire-weather conditions will persist from the Day 1 outlook period (Mon) well into Day 2 (Tues). Sustained winds of 40-45 MPH (gusting 70-100 MPH on mountains, 50-80 MPH in the valleys/coastal regions) with single-digit relative humidity values as low as 2%-5% will be ongoing at the start of the period, subsiding by late Tuesday afternoon/early Tuesday evening. For more details, see the current Day 1 fire-weather outlook. ...Extremely Critical fire-weather conditions for portions of the eastern San Diego foothills into the western San Jacinto Mountains... Confidence has increased in strong, dry offshore flow across far Southern California, particularly portions of the eastern San Diego foothills into the San Jacinto Mountains. Recent 00Z HREF guidance shows ensemble mean sustained surface winds as high as 50-55 MPH, with the ensemble maximum as high as 60 MPH and gusts as high as 80 MPH. Coupled with single-digit relative humidities, this will result in several hours of Extremely Critical fire-weather conditions supportive of rapid wildfire onset and spread, subsiding by late Tuesday evening into Wednesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 201200Z - 211200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... While most of the CONUS is dominated by cold air and high pressure, a strong, positively-tilted mid-level trough will move southward across California, with a highly amplified mid-level Pacific ridge following behind it. As the trough axis reaches southern California Monday afternoon, intensifying surface pressure gradients will result in the development of strong Santa Ana winds. The 00Z HREF guidance and global ensembles continue to forecast strong LAX->DAG pressure gradients ranging from -8 mb to -11 mb, with wind speeds trending upward to 40-45 MPH sustained (gusting 70 - 100 MPH on the mountains, 50 - 80 MPH in the valleys/coastal regions). In addition to the upward trend in wind speed and gust forecasts, relative humidity values have trended significantly drier, with values as low as 2%-5%. These Extremely Critical fire-weather conditions, supporting rapid wildfire onset and spread, will begin Monday afternoon and reach peak intensity Monday evening into Tuesday morning. The area of greatest risk lies from the San Gabriel Mountains westward into the Santa Monica Mountains, the Malibu Coast, and the Santa Susana Mountains. Elsewhere, Critical fire-weather conditions extend southward to the U.S./Mexico border, where strong (and critically dry) offshore winds will persist overnight into Tuesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 201200Z - 211200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... While most of the CONUS is dominated by cold air and high pressure, a strong, positively-tilted mid-level trough will move southward across California, with a highly amplified mid-level Pacific ridge following behind it. As the trough axis reaches southern California Monday afternoon, intensifying surface pressure gradients will result in the development of strong Santa Ana winds. The 00Z HREF guidance and global ensembles continue to forecast strong LAX->DAG pressure gradients ranging from -8 mb to -11 mb, with wind speeds trending upward to 40-45 MPH sustained (gusting 70 - 100 MPH on the mountains, 50 - 80 MPH in the valleys/coastal regions). In addition to the upward trend in wind speed and gust forecasts, relative humidity values have trended significantly drier, with values as low as 2%-5%. These Extremely Critical fire-weather conditions, supporting rapid wildfire onset and spread, will begin Monday afternoon and reach peak intensity Monday evening into Tuesday morning. The area of greatest risk lies from the San Gabriel Mountains westward into the Santa Monica Mountains, the Malibu Coast, and the Santa Susana Mountains. Elsewhere, Critical fire-weather conditions extend southward to the U.S./Mexico border, where strong (and critically dry) offshore winds will persist overnight into Tuesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 201200Z - 211200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... While most of the CONUS is dominated by cold air and high pressure, a strong, positively-tilted mid-level trough will move southward across California, with a highly amplified mid-level Pacific ridge following behind it. As the trough axis reaches southern California Monday afternoon, intensifying surface pressure gradients will result in the development of strong Santa Ana winds. The 00Z HREF guidance and global ensembles continue to forecast strong LAX->DAG pressure gradients ranging from -8 mb to -11 mb, with wind speeds trending upward to 40-45 MPH sustained (gusting 70 - 100 MPH on the mountains, 50 - 80 MPH in the valleys/coastal regions). In addition to the upward trend in wind speed and gust forecasts, relative humidity values have trended significantly drier, with values as low as 2%-5%. These Extremely Critical fire-weather conditions, supporting rapid wildfire onset and spread, will begin Monday afternoon and reach peak intensity Monday evening into Tuesday morning. The area of greatest risk lies from the San Gabriel Mountains westward into the Santa Monica Mountains, the Malibu Coast, and the Santa Susana Mountains. Elsewhere, Critical fire-weather conditions extend southward to the U.S./Mexico border, where strong (and critically dry) offshore winds will persist overnight into Tuesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 201200Z - 211200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... While most of the CONUS is dominated by cold air and high pressure, a strong, positively-tilted mid-level trough will move southward across California, with a highly amplified mid-level Pacific ridge following behind it. As the trough axis reaches southern California Monday afternoon, intensifying surface pressure gradients will result in the development of strong Santa Ana winds. The 00Z HREF guidance and global ensembles continue to forecast strong LAX->DAG pressure gradients ranging from -8 mb to -11 mb, with wind speeds trending upward to 40-45 MPH sustained (gusting 70 - 100 MPH on the mountains, 50 - 80 MPH in the valleys/coastal regions). In addition to the upward trend in wind speed and gust forecasts, relative humidity values have trended significantly drier, with values as low as 2%-5%. These Extremely Critical fire-weather conditions, supporting rapid wildfire onset and spread, will begin Monday afternoon and reach peak intensity Monday evening into Tuesday morning. The area of greatest risk lies from the San Gabriel Mountains westward into the Santa Monica Mountains, the Malibu Coast, and the Santa Susana Mountains. Elsewhere, Critical fire-weather conditions extend southward to the U.S./Mexico border, where strong (and critically dry) offshore winds will persist overnight into Tuesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 201200Z - 211200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... While most of the CONUS is dominated by cold air and high pressure, a strong, positively-tilted mid-level trough will move southward across California, with a highly amplified mid-level Pacific ridge following behind it. As the trough axis reaches southern California Monday afternoon, intensifying surface pressure gradients will result in the development of strong Santa Ana winds. The 00Z HREF guidance and global ensembles continue to forecast strong LAX->DAG pressure gradients ranging from -8 mb to -11 mb, with wind speeds trending upward to 40-45 MPH sustained (gusting 70 - 100 MPH on the mountains, 50 - 80 MPH in the valleys/coastal regions). In addition to the upward trend in wind speed and gust forecasts, relative humidity values have trended significantly drier, with values as low as 2%-5%. These Extremely Critical fire-weather conditions, supporting rapid wildfire onset and spread, will begin Monday afternoon and reach peak intensity Monday evening into Tuesday morning. The area of greatest risk lies from the San Gabriel Mountains westward into the Santa Monica Mountains, the Malibu Coast, and the Santa Susana Mountains. Elsewhere, Critical fire-weather conditions extend southward to the U.S./Mexico border, where strong (and critically dry) offshore winds will persist overnight into Tuesday morning. ..Halbert.. 01/20/2025 ...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 0208 AM CST Mon Jan 20 2025 Valid 201200Z - 211200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE SAN GABRIEL MOUNTAINS WEST TOWARDS THE SANTA MONICA MOUNTAINS AND SANTA SUSANA MOUNTAINS... INCLUDING THE MALIBU COAST... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... ...Synopsis... While most of the CONUS is dominated by cold air and high pressure, a strong, positively-tilted mid-level trough will move southward across California, with a highly amplified mid-level Pacific ridge following behind it. As the trough axis reaches southern California Monday afternoon, intensifying surface pressure gradients will result in the development of strong Santa Ana winds. The 00Z HREF guidance and global ensembles continue to forecast strong LAX->DAG pressure gradients ranging from -8 mb to -11 mb, with wind speeds trending upward to 40-45 MPH sustained (gusting 70 - 100 MPH on the mountains, 50 - 80 MPH in the valleys/coastal regions). In addition to the upward trend in wind speed and gust forecasts, relative humidity values have trended significantly drier, with values as low as 2%-5%. These Extremely Critical fire-weather conditions, supporting rapid wildfire onset and spread, will begin Monday afternoon and reach peak intensity Monday evening into Tuesday morning. The area of greatest risk lies from the San Gabriel Mountains westward into the Santa Monica Mountains, the Malibu Coast, and the Santa Susana Mountains. Elsewhere, Critical fire-weather conditions extend southward to the U.S./Mexico border, where strong (and critically dry) offshore winds will persist overnight into Tuesday morning. ..Halbert.. 01/20/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more