Severe Storms

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0155 PM CST Tue Dec 19 2023 Valid 192000Z - 201200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms remain possible today across parts of central and northern California. ...20Z Update... No changes have been made to the prior forecast. ..Gleason.. 12/19/2023 .PREV DISCUSSION... /ISSUED 1023 AM CST Tue Dec 19 2023/ ...Discussion... Broad/low-amplitude ridging aloft will prevail across most of the U.S. today, in the wake of a trough shifting eastward across the Mid-Atlantic Region and New England. In the West, an eastern Pacific low will continue shifting southeastward, with only a glancing influence across the West Coast states. However, this glancing influence will be enough to keep mid-levels relatively cool, and thus maintain very weak instability across this region. As such, sporadic lightning strikes will remain possible -- mainly across portions of northern and central California through tonight. Elsewhere, with the eastern U.S. surface cold front already offshore, and cool/stable high pressure prevailing east of the Rockies, thunderstorms are not expected. Read more

WW 0999 Status Updates
STATUS FOR WATCH 0999 HAS NOT BEEN ISSUED YET Read more

WW 0999 Status Updates
STATUS FOR WATCH 0999 HAS NOT BEEN ISSUED YET Read more

WW 999 TEST SEVERE TSTM OK 191935Z - 192000Z
URGENT - IMMEDIATE BROADCAST REQUESTED TEST...Severe Thunderstorm Watch Number 999...TEST NWS Storm Prediction Center Norman OK 135 PM CST Tue Dec 19 2023 The NWS Storm Prediction Center has issued a...TEST... * Severe Thunderstorm Watch for portions of Oklahoma * Effective this Tuesday afternoon from 135 PM until 200 PM CST. * Primary threats include... SUMMARY...This is a TEST WATCH. THE TEST SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG and 30 STATUTE MILES EAST and WEST OF A LINE from 10 MILES SOUTH OF CLINTON OKLAHOMA TO 25 MILES NORTH OF CLINTON OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && AVIATION...A few severe thunderstorms with hail surface and aloft to 0.5 inches. Extreme turbulence and surface wind gusts to 50 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 24010. ...Spctest Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1238 PM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO CRITICAL AREAS... Minimal fire-weather concerns are expected over the CONUS D2/Wednesday. Locally dry conditions are possible over parts of the Southeast beneath strong high pressure. While RH may fall below 30% at times, relatively cool temperatures and weak winds will not favor widespread fire-weather concerns. Elsewhere over the CONUS, abundant precipitation and cooler temperatures are expected, and fire-weather potential is low. ..Lyons.. 12/19/2023 .PREV DISCUSSION... /ISSUED 1216 AM CST Tue Dec 19 2023/ ...Synopsis... Upper ridging will persist from the Plains states eastward to the Atlantic coastline as a mid-level trough meanders off of the coast of California tomorrow/Wednesday. Surface high pressure and cooler air will continue to dominate west of the Rockies and east of the Mississippi River, as on Day 1. Low-level moisture return across the Plains states, driven by surface lee troughing, will also dampen significant wildfire-spread potential as well. ...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 1238 PM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO CRITICAL AREAS... Minimal fire-weather concerns are expected over the CONUS D2/Wednesday. Locally dry conditions are possible over parts of the Southeast beneath strong high pressure. While RH may fall below 30% at times, relatively cool temperatures and weak winds will not favor widespread fire-weather concerns. Elsewhere over the CONUS, abundant precipitation and cooler temperatures are expected, and fire-weather potential is low. ..Lyons.. 12/19/2023 .PREV DISCUSSION... /ISSUED 1216 AM CST Tue Dec 19 2023/ ...Synopsis... Upper ridging will persist from the Plains states eastward to the Atlantic coastline as a mid-level trough meanders off of the coast of California tomorrow/Wednesday. Surface high pressure and cooler air will continue to dominate west of the Rockies and east of the Mississippi River, as on Day 1. Low-level moisture return across the Plains states, driven by surface lee troughing, will also dampen significant wildfire-spread potential as well. ...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 1238 PM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO CRITICAL AREAS... Minimal fire-weather concerns are expected over the CONUS D2/Wednesday. Locally dry conditions are possible over parts of the Southeast beneath strong high pressure. While RH may fall below 30% at times, relatively cool temperatures and weak winds will not favor widespread fire-weather concerns. Elsewhere over the CONUS, abundant precipitation and cooler temperatures are expected, and fire-weather potential is low. ..Lyons.. 12/19/2023 .PREV DISCUSSION... /ISSUED 1216 AM CST Tue Dec 19 2023/ ...Synopsis... Upper ridging will persist from the Plains states eastward to the Atlantic coastline as a mid-level trough meanders off of the coast of California tomorrow/Wednesday. Surface high pressure and cooler air will continue to dominate west of the Rockies and east of the Mississippi River, as on Day 1. Low-level moisture return across the Plains states, driven by surface lee troughing, will also dampen significant wildfire-spread potential as well. ...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 1238 PM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO CRITICAL AREAS... Minimal fire-weather concerns are expected over the CONUS D2/Wednesday. Locally dry conditions are possible over parts of the Southeast beneath strong high pressure. While RH may fall below 30% at times, relatively cool temperatures and weak winds will not favor widespread fire-weather concerns. Elsewhere over the CONUS, abundant precipitation and cooler temperatures are expected, and fire-weather potential is low. ..Lyons.. 12/19/2023 .PREV DISCUSSION... /ISSUED 1216 AM CST Tue Dec 19 2023/ ...Synopsis... Upper ridging will persist from the Plains states eastward to the Atlantic coastline as a mid-level trough meanders off of the coast of California tomorrow/Wednesday. Surface high pressure and cooler air will continue to dominate west of the Rockies and east of the Mississippi River, as on Day 1. Low-level moisture return across the Plains states, driven by surface lee troughing, will also dampen significant wildfire-spread potential as well. ...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 1238 PM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO CRITICAL AREAS... Minimal fire-weather concerns are expected over the CONUS D2/Wednesday. Locally dry conditions are possible over parts of the Southeast beneath strong high pressure. While RH may fall below 30% at times, relatively cool temperatures and weak winds will not favor widespread fire-weather concerns. Elsewhere over the CONUS, abundant precipitation and cooler temperatures are expected, and fire-weather potential is low. ..Lyons.. 12/19/2023 .PREV DISCUSSION... /ISSUED 1216 AM CST Tue Dec 19 2023/ ...Synopsis... Upper ridging will persist from the Plains states eastward to the Atlantic coastline as a mid-level trough meanders off of the coast of California tomorrow/Wednesday. Surface high pressure and cooler air will continue to dominate west of the Rockies and east of the Mississippi River, as on Day 1. Low-level moisture return across the Plains states, driven by surface lee troughing, will also dampen significant wildfire-spread potential as well. ...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 1238 PM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO CRITICAL AREAS... Minimal fire-weather concerns are expected over the CONUS D2/Wednesday. Locally dry conditions are possible over parts of the Southeast beneath strong high pressure. While RH may fall below 30% at times, relatively cool temperatures and weak winds will not favor widespread fire-weather concerns. Elsewhere over the CONUS, abundant precipitation and cooler temperatures are expected, and fire-weather potential is low. ..Lyons.. 12/19/2023 .PREV DISCUSSION... /ISSUED 1216 AM CST Tue Dec 19 2023/ ...Synopsis... Upper ridging will persist from the Plains states eastward to the Atlantic coastline as a mid-level trough meanders off of the coast of California tomorrow/Wednesday. Surface high pressure and cooler air will continue to dominate west of the Rockies and east of the Mississippi River, as on Day 1. Low-level moisture return across the Plains states, driven by surface lee troughing, will also dampen significant wildfire-spread potential as well. ...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 1238 PM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO CRITICAL AREAS... Minimal fire-weather concerns are expected over the CONUS D2/Wednesday. Locally dry conditions are possible over parts of the Southeast beneath strong high pressure. While RH may fall below 30% at times, relatively cool temperatures and weak winds will not favor widespread fire-weather concerns. Elsewhere over the CONUS, abundant precipitation and cooler temperatures are expected, and fire-weather potential is low. ..Lyons.. 12/19/2023 .PREV DISCUSSION... /ISSUED 1216 AM CST Tue Dec 19 2023/ ...Synopsis... Upper ridging will persist from the Plains states eastward to the Atlantic coastline as a mid-level trough meanders off of the coast of California tomorrow/Wednesday. Surface high pressure and cooler air will continue to dominate west of the Rockies and east of the Mississippi River, as on Day 1. Low-level moisture return across the Plains states, driven by surface lee troughing, will also dampen significant wildfire-spread potential as well. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1122 AM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible across parts of southern/central California and over portions of the Southwest on Wednesday. Organized severe thunderstorms appear unlikely. ...Synopsis and Discussion... An upper trough/low initially over the eastern Pacific and west of San Francisco is forecast to advance generally southward through Wednesday night. To the east of this feature, a belt of modestly enhanced mid-level southwesterly flow will overspread parts of southern/central CA through the period. A band of precipitation preceding a surface front should move slowly eastward through the day, eventually impacting coastal portions of southern/central CA. Modest diurnal heating of a moist profile through low/mid levels should support the development of weak instability across these areas. Isolated thunderstorms may occur within the larger band of precipitation as it advances eastward. Poor lapse rates should generally limit updraft intensity, and organized severe thunderstorms appear unlikely. Still, isolated strong/gusty winds may occur given somewhat favorable kinematics. Occasional lighting flashes also appear possible Wednesday across parts of AZ/NM into far west TX in association with a weak shortwave trough moving northeastward over these areas. Both moisture and buoyancy appear quite limited, which should keep the overall thunderstorm threat rather isolated. ..Gleason.. 12/19/2023 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1122 AM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible across parts of southern/central California and over portions of the Southwest on Wednesday. Organized severe thunderstorms appear unlikely. ...Synopsis and Discussion... An upper trough/low initially over the eastern Pacific and west of San Francisco is forecast to advance generally southward through Wednesday night. To the east of this feature, a belt of modestly enhanced mid-level southwesterly flow will overspread parts of southern/central CA through the period. A band of precipitation preceding a surface front should move slowly eastward through the day, eventually impacting coastal portions of southern/central CA. Modest diurnal heating of a moist profile through low/mid levels should support the development of weak instability across these areas. Isolated thunderstorms may occur within the larger band of precipitation as it advances eastward. Poor lapse rates should generally limit updraft intensity, and organized severe thunderstorms appear unlikely. Still, isolated strong/gusty winds may occur given somewhat favorable kinematics. Occasional lighting flashes also appear possible Wednesday across parts of AZ/NM into far west TX in association with a weak shortwave trough moving northeastward over these areas. Both moisture and buoyancy appear quite limited, which should keep the overall thunderstorm threat rather isolated. ..Gleason.. 12/19/2023 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1122 AM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible across parts of southern/central California and over portions of the Southwest on Wednesday. Organized severe thunderstorms appear unlikely. ...Synopsis and Discussion... An upper trough/low initially over the eastern Pacific and west of San Francisco is forecast to advance generally southward through Wednesday night. To the east of this feature, a belt of modestly enhanced mid-level southwesterly flow will overspread parts of southern/central CA through the period. A band of precipitation preceding a surface front should move slowly eastward through the day, eventually impacting coastal portions of southern/central CA. Modest diurnal heating of a moist profile through low/mid levels should support the development of weak instability across these areas. Isolated thunderstorms may occur within the larger band of precipitation as it advances eastward. Poor lapse rates should generally limit updraft intensity, and organized severe thunderstorms appear unlikely. Still, isolated strong/gusty winds may occur given somewhat favorable kinematics. Occasional lighting flashes also appear possible Wednesday across parts of AZ/NM into far west TX in association with a weak shortwave trough moving northeastward over these areas. Both moisture and buoyancy appear quite limited, which should keep the overall thunderstorm threat rather isolated. ..Gleason.. 12/19/2023 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1122 AM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible across parts of southern/central California and over portions of the Southwest on Wednesday. Organized severe thunderstorms appear unlikely. ...Synopsis and Discussion... An upper trough/low initially over the eastern Pacific and west of San Francisco is forecast to advance generally southward through Wednesday night. To the east of this feature, a belt of modestly enhanced mid-level southwesterly flow will overspread parts of southern/central CA through the period. A band of precipitation preceding a surface front should move slowly eastward through the day, eventually impacting coastal portions of southern/central CA. Modest diurnal heating of a moist profile through low/mid levels should support the development of weak instability across these areas. Isolated thunderstorms may occur within the larger band of precipitation as it advances eastward. Poor lapse rates should generally limit updraft intensity, and organized severe thunderstorms appear unlikely. Still, isolated strong/gusty winds may occur given somewhat favorable kinematics. Occasional lighting flashes also appear possible Wednesday across parts of AZ/NM into far west TX in association with a weak shortwave trough moving northeastward over these areas. Both moisture and buoyancy appear quite limited, which should keep the overall thunderstorm threat rather isolated. ..Gleason.. 12/19/2023 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1122 AM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible across parts of southern/central California and over portions of the Southwest on Wednesday. Organized severe thunderstorms appear unlikely. ...Synopsis and Discussion... An upper trough/low initially over the eastern Pacific and west of San Francisco is forecast to advance generally southward through Wednesday night. To the east of this feature, a belt of modestly enhanced mid-level southwesterly flow will overspread parts of southern/central CA through the period. A band of precipitation preceding a surface front should move slowly eastward through the day, eventually impacting coastal portions of southern/central CA. Modest diurnal heating of a moist profile through low/mid levels should support the development of weak instability across these areas. Isolated thunderstorms may occur within the larger band of precipitation as it advances eastward. Poor lapse rates should generally limit updraft intensity, and organized severe thunderstorms appear unlikely. Still, isolated strong/gusty winds may occur given somewhat favorable kinematics. Occasional lighting flashes also appear possible Wednesday across parts of AZ/NM into far west TX in association with a weak shortwave trough moving northeastward over these areas. Both moisture and buoyancy appear quite limited, which should keep the overall thunderstorm threat rather isolated. ..Gleason.. 12/19/2023 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1122 AM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible across parts of southern/central California and over portions of the Southwest on Wednesday. Organized severe thunderstorms appear unlikely. ...Synopsis and Discussion... An upper trough/low initially over the eastern Pacific and west of San Francisco is forecast to advance generally southward through Wednesday night. To the east of this feature, a belt of modestly enhanced mid-level southwesterly flow will overspread parts of southern/central CA through the period. A band of precipitation preceding a surface front should move slowly eastward through the day, eventually impacting coastal portions of southern/central CA. Modest diurnal heating of a moist profile through low/mid levels should support the development of weak instability across these areas. Isolated thunderstorms may occur within the larger band of precipitation as it advances eastward. Poor lapse rates should generally limit updraft intensity, and organized severe thunderstorms appear unlikely. Still, isolated strong/gusty winds may occur given somewhat favorable kinematics. Occasional lighting flashes also appear possible Wednesday across parts of AZ/NM into far west TX in association with a weak shortwave trough moving northeastward over these areas. Both moisture and buoyancy appear quite limited, which should keep the overall thunderstorm threat rather isolated. ..Gleason.. 12/19/2023 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1122 AM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible across parts of southern/central California and over portions of the Southwest on Wednesday. Organized severe thunderstorms appear unlikely. ...Synopsis and Discussion... An upper trough/low initially over the eastern Pacific and west of San Francisco is forecast to advance generally southward through Wednesday night. To the east of this feature, a belt of modestly enhanced mid-level southwesterly flow will overspread parts of southern/central CA through the period. A band of precipitation preceding a surface front should move slowly eastward through the day, eventually impacting coastal portions of southern/central CA. Modest diurnal heating of a moist profile through low/mid levels should support the development of weak instability across these areas. Isolated thunderstorms may occur within the larger band of precipitation as it advances eastward. Poor lapse rates should generally limit updraft intensity, and organized severe thunderstorms appear unlikely. Still, isolated strong/gusty winds may occur given somewhat favorable kinematics. Occasional lighting flashes also appear possible Wednesday across parts of AZ/NM into far west TX in association with a weak shortwave trough moving northeastward over these areas. Both moisture and buoyancy appear quite limited, which should keep the overall thunderstorm threat rather isolated. ..Gleason.. 12/19/2023 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1122 AM CST Tue Dec 19 2023 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible across parts of southern/central California and over portions of the Southwest on Wednesday. Organized severe thunderstorms appear unlikely. ...Synopsis and Discussion... An upper trough/low initially over the eastern Pacific and west of San Francisco is forecast to advance generally southward through Wednesday night. To the east of this feature, a belt of modestly enhanced mid-level southwesterly flow will overspread parts of southern/central CA through the period. A band of precipitation preceding a surface front should move slowly eastward through the day, eventually impacting coastal portions of southern/central CA. Modest diurnal heating of a moist profile through low/mid levels should support the development of weak instability across these areas. Isolated thunderstorms may occur within the larger band of precipitation as it advances eastward. Poor lapse rates should generally limit updraft intensity, and organized severe thunderstorms appear unlikely. Still, isolated strong/gusty winds may occur given somewhat favorable kinematics. Occasional lighting flashes also appear possible Wednesday across parts of AZ/NM into far west TX in association with a weak shortwave trough moving northeastward over these areas. Both moisture and buoyancy appear quite limited, which should keep the overall thunderstorm threat rather isolated. ..Gleason.. 12/19/2023 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1023 AM CST Tue Dec 19 2023 Valid 191630Z - 201200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms are possible today across parts of central and northern California. ...Discussion... Broad/low-amplitude ridging aloft will prevail across most of the U.S. today, in the wake of a trough shifting eastward across the Mid-Atlantic Region and New England. In the West, an eastern Pacific low will continue shifting southeastward, with only a glancing influence across the West Coast states. However, this glancing influence will be enough to keep mid-levels relatively cool, and thus maintain very weak instability across this region. As such, sporadic lightning strikes will remain possible -- mainly across portions of northern and central California through tonight. Elsewhere, with the eastern U.S. surface cold front already offshore, and cool/stable high pressure prevailing east of the Rockies, thunderstorms are not expected. ..Goss/Thornton.. 12/19/2023 Read more