Tag: convective

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0656 PM CST Sun Dec 22 2024 Valid 230100Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast across the contiguous United States through tonight. ...Synopsis... An upper trough currently exists along the coastal Pacific Northwest this evening, and height rises will occur tonight as the wave moves northeastward across OR and WA. In the near term, a few thunderstorms will remain possible over coastal northern CA, and farther north across western WA beneath the cooler air aloft. Most of the

SPC 1300Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0700 AM CST Sun Dec 22 2024 Valid 221300Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast across the contiguous United States through tonight. ...Synopsis... Water-vapor imagery this morning shows an upper trough over the eastern Pacific to the west of the Pacific Northwest coast. This upper feature will move east-northeast into British Columbia and WA/OR tonight. Cooling midlevel temperatures will result in weak buoyancy (100-200 J/kg MUCAPE) late today into tonight from portions of northern CA northward along the

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0653 PM CST Sat Dec 21 2024 Valid 220100Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the USA through tomorrow morning. The minimal thunderstorm threat has ended over parts of the Pacific Northwest as rapid warming aloft is underway behind a compact shortwave trough. Instability is not expected to materialize downstream into ID and MT, and as such all thunderstorm probabilities have been removed. Elsewhere, high pressure over the East and a dry air mass over land will maintain stable

SPC 1300Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0650 AM CST Sat Dec 21 2024 Valid 211300Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible this morning into early afternoon across parts of coastal Oregon and northern California. ...Coastal OR/northern CA... A potent mid to upper-level shortwave trough will move ashore the northern CA/OR coast and continue northeastward into the southern Canadian Rockies/northern Rockies vicinity through late tonight. Weak thunderstorm activity embedded within a warm-air advection rain shield will continue moving into the coastal range mountains this morning before

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0644 PM CST Fri Dec 20 2024 Valid 210100Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible along the northern California coast early morning Saturday. ...Northern CA coast... An amplified upper trough will move northeast and approach the Pacific Northwest coast through 12Z Saturday. This will yield a pronounced low-level warm conveyor to overspread the adjacent offshore waters. This forcing for ascent in conjunction with an ample buoyancy plume has supported scattered to widespread thunderstorms around 500-600 miles offshore. This buoyancy

SPC 1300Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0644 AM CST Fri Dec 20 2024 Valid 201300Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe weather is not forecast across the contiguous United States through tonight. ...Synopsis... Water-vapor imagery this morning shows an upper trough centered over the Great Lakes, with this feature forecast to move east into the Northeast and east of the Mid-Atlantic states by late tonight. Farther west, a mid-level ridge will reside over the Rockies with an upper trough over the eastern Pacific approaching the northern CA/Pacific Northwest

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0650 PM CST Thu Dec 19 2024 Valid 200100Z - 201200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected tonight. ..Grams.. 12/20/2024 Read more

SPC 1300Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0636 AM CST Thu Dec 19 2024 Valid 191300Z - 201200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected through tonight. ...Synopsis/Discussion... The upper-tropospheric pattern is evolving back to an eastern mean trough and western ridge for a few days, as a series of shortwave troughs dig southeastward from the northern/central Plains and upstream parts of western/central Canada. Low-level cold frontal passage related to the eastern troughing will render the airmass east of the Rockies too dry and/or stable for thunderstorms over land for

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0646 PM CST Wed Dec 18 2024 Valid 190100Z - 191200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms will largely diminish across the Southeast tonight. ...Southeast... Isolated thunderstorms persist across parts of the Carolinas into the FL Panhandle, and separately over the south FL Peninsula. Within a weakly buoyant warm-moist sector ahead of this activity, overall convective potential will generally diminish. This will occur more rapidly overnight as large-scale ascent weakens/shifts off the South Atlantic Coast. Thunderstorms will be relegated to the Gulf Stream during

SPC 1300Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0651 AM CST Wed Dec 18 2024 Valid 181300Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE TENNESSEE VALLEY REGION... ...SUMMARY... Isolated damaging wind gusts and a brief tornado are possible into early afternoon across parts of the Tennessee Valley region. ...Synopsis... A continuing progressive pattern aloft will be dominated by two main shortwave troughs: a trailing perturbation now over the coastal Pacific Northwest, and a positively tilted one apparent in moisture- channel imagery near a DBQ-STJ-P28-DHT axis. The