SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1137 PM CST Sat Nov 20 2021 Valid 211200Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected on Sunday. ...Discussion... Amplification of the upper flow field across the U.S. is expected Sunday, as a trough crossing the central U.S. strengthens as it shifts eastward, and ridging expands across the West. At the surface, a cold front is progged to surge rapidly southeastward across the Upper Great Lakes and Plains states through the first half of the period. Overnight, the front will continue its rapid advance, shifting east of the Appalachians and into the Gulf of Mexico through Monday morning. Rain showers and sporadic/embedded thunderstorms will evolve near -- and behind -- the surface front, initially across the lower Ohio/mid Mississippi Valleys and the Ozark Plateau, and then will expand southeastward with time into the Gulf Coastal states. Other showers and occasional lightning will be possible across portions of southern Florida, and perhaps across the coastal North Carolina vicinity overnight. In all areas, severe storms are not expected. ..Goss/Dean.. 11/21/2021 Read more LIVE: spc.noaa.gov
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