Severe Storm Outlook Narrative (AC)
Issued by NWS
Issued by NWS
497 ACUS03 KWNS 091921 SWODY3 SPC AC 091920 Day 3 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0120 PM CST Sat Nov 09 2024 Valid 111200Z - 121200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... CORRECTED FOR THUNDER LINE GROUPING ...SUMMARY... Severe storms are unlikely Monday or Monday night. ...Synopsis... Largely zonal mid-level flow, with several embedded perturbations, is expected across the CONUS Monday. Pacific troughing and onshore flow behind a cold front will support scattered showers and a few thunderstorms over the Pacific Northwest. A surface anticyclone should move into the Upper Midwest, as shortwave ridging builds south across the MS Valley. Broad mid-level troughing will continue over the East as a slow-moving cold front makes its way toward the coast. Scattered showers and isolated, non-severe thunderstorms are likely over parts of the Southeast. ...Carolinas and the Southeast.... Broad troughing over the eastern CONUS will encourage zonal flow aloft atop a slow-moving cold front across the Southeast. Widespread clouds and ongoing precipitation are expected east of the front given relatively abundant surface moisture and weak ascent. This will tend to limit buoyancy and lapse rates across much of the region. Isolated thunderstorms are possible, focused early in the convective cycle, primarily across the eastern Carolinas and parts of the Gulf Coast/FL. However, with weak buoyancy and limited vertical shear, severe storms appear unlikely. ...Pacific Northwest... As the shortwave trough and the trailing cold front move onshore, steepening low-level lapse rates beneath the cold core aloft may result in enough buoyancy for a few thunderstorms across coastal WA/OR and far northern CA. While not overly favorable, some model guidance shows MUCAPE on the order of 200-400 J/kg sufficient for stronger, low-topped convection. Any lightning that does develop should remain isolated and become increasingly infrequent farther inland where cool surface temperatures will promote strong stability. ..Lyons.. 11/09/2024 $$