SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1111 AM CST Sat Nov 21 2020 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Organized severe thunderstorms appear unlikely across the contiguous United States on Sunday. ...Synopsis... Shortwave trough currently moving into the northern Rockies is forecast to continue southeastward across the Plains today and tonight. By early Sunday, this shortwave will likely extend from the Upper MS Valley into central KS. This shortwave is expected to remain progressive on Sunday, ending the period extending from the Upper OH Valley southward into the western Carolinas. Surface low associated with this system will be centered the near confluence of the MS and OH Rivers early Sunday, before continuing quickly northeastward throughout the day while occluding. An attendant cold front will extend southwestward from this low and is forecast to progress through the southern Plains, mid/low MS Valley, and OH/TN Valley throughout the period. Limited low-level moisture will be in place ahead of the front early in the period from the southern Plains into the Lower OH and TN Valley, with some isolated lightning flashes possible along and behind the front within this corridor. Some isolated flashes are also possible early Monday morning over the eastern Carolinas amid modest low-level moisture advection ahead of the approaching front. Elsewhere, isolated thunderstorms may occur Sunday across parts of the FL Peninsula and the Keys as weak low-level easterly flow continues, and the Four Corners vicinity into western CO as upper troughing amplifies over the western CONUS late in the period. ..Mosier.. 11/21/2020
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