SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1100 PM CST Thu Nov 18 2021 Valid 191200Z - 201200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk for thunderstorms appears negligible across most of the U.S. today through tonight. ...Discussion... Models indicate renewed amplification within the westerlies across the eastern Pacific during this period, including building mid-level ridging to the west of the Pacific coast. However, flow across much of interior North America may continue to trend more zonal, in the wake of a significant mid-level trough now approaching the northern through middle Atlantic Seaboard. The mid-level trough is forecast to progress into the Canadian Maritimes and off the U.S. coast today through tonight, with the center of an associated broad, occluded surface cyclone migrating from northern Quebec into the Labrador Sea. While the trailing cold front will advance away from much of the Atlantic Seaboard, it appears that it will gradually stall and weaken beneath the zonal regime across the Florida Peninsula. Generally dry and/or stable conditions will prevail across much of the U.S., but scattered thunderstorm activity is possible within a moist easterly pre-frontal low-level flow regime across parts of southern Florida, mainly the offshore Atlantic into the vicinity of eastern coastal areas. ..Kerr/Weinman/Dean.. 11/19/2021 Read more LIVE: spc.noaa.gov
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