SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1144 PM CST Sun Nov 21 2021 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected across the contiguous United States on Monday. ...Discussion... An amplified upper flow field will continue across the U.S. today, as a trough shifts across the eastern U.S. and ridging spreads out of the western and into central portions of the country. Later in the day and into the second half of the period, a second trough will approach -- and eventually reach -- the northwestern states. At the surface, a cold front will be in the process of moving off the Atlantic and Gulf Coasts early in the period. By midday, the front will have cleared all but the Florida Peninsula; by the end of the period, the front will have progressed south of the Peninsula and through most of the Gulf of Mexico. Showers accompanying the frontal advance will extend from New England to southern Louisiana and South Texas at the start of the period. A few lightning flashes may occur within this band, but coverage should remain below 10% inland. The one exception will be across Florida, where a few thunderstorms will remain possible into the evening, until the cold front clears the state overnight. A few flashes may also occur within an area of showery precipitation that will spread into the Pacific Northwest in the wake of a cold front that will advance inland through the evening. However, sparse coverage is anticipated, precluding the need for a thunder area. ..Goss/Jirak.. 11/22/2021 Read more LIVE: spc.noaa.gov
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