SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1129 PM CST Fri Nov 26 2021 Valid 271200Z - 281200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not forecast across the contiguous United States on Saturday. ...Discussion... Gradual amplification of the upper flow pattern over the U.S. is expected today, as short-wave troughing progressing southeastward across the Canadian Priairie provinces and northern/central Plains states eventually begins phasing with a southern-stream trough crossing the south-central states. The eventual result will be a broad trough over the East, and upstream ridging over the West. At the surface, a weak low/front will shift out of the Plains and across the mid and lower MS/OH/TN valleys with time, while high pressure prevails elsewhere. With a continental airmass largely in place over the U.S., little potential for thunderstorms is evident. The lone exception could be across the Texas vicinity, where a few sporadic lightning flashes could occur with weak/elevated convection, within an area of QG-forced precipitation associated with the aforementioned upper short-wave trough. However, coverage appears likely to remain sparse, precluding inclusion of the 10% area. ..Goss/Elliott.. 11/27/2021 Read more LIVE: spc.noaa.gov
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