SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0200 AM CST Thu Nov 18 2021 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast across the contiguous United States on Saturday. ...Synopsis and Discussion... Surface high pressure initially centered over the East Coast should gradually shift into the western Atlantic on Saturday as an area of weak low pressure develops southeastward across south-central Canada near the international border. An upper trough is forecast to gradually amplify as it moves eastward across central Canada and into the northern/central Plains and Upper Midwest by the end of the period. Modest low-level moisture return should occur across parts of the southern Plains ahead of a cold front attendant to the weak surface low. Regardless, this moisture is expected to remain too shallow/limited to support thunderstorms. More substantial low-level moisture will likely remain confined to parts of the FL Peninsula through the day along/south of a remnant front. Large-scale ascent across this region will remain nebulous at best. Still, weak low-level convergence along sea breeze boundaries may be sufficient for isolated thunderstorms Saturday afternoon, mainly across parts of the eastern and southern FL Peninsula. Severe thunderstorms are not expected. ..Gleason.. 11/18/2021 Read more LIVE: spc.noaa.gov
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