SPC AC 210034

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0634 PM CST Wed Nov 20 2019

   Valid 210100Z - 211200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Isolated thunderstorms will be possible this evening into the
   overnight from parts of the Desert Southwest into the southern
   Plains.

   ...DISCUSSION...
   The latest water vapor imagery shows a shortwave trough moving
   northeastward trough the southern and central Plains with an
   upper-level low over the Desert Southwest. Isolated thunderstorms
   are ongoing from southwest Texas into western Oklahoma along a
   corridor of instability located from near and to the west of the
   shortwave trough. This activity will continue to move eastward into
   weaker instability this evening into the overnight period.
   Thunderstorms will also be possible from near the upper-level low in
   southern California eastward across much of Arizona tonight.
   Instability is not expected to be sufficient for a severe threat
   across the CONUS. For this reason, the marginal risk area has been
   dropped.

   ..Broyles.. 11/21/2019

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