SPC AC 270529

   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

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