SPC AC 180521

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1121 PM CST Thu Dec 17 2020

   Valid 181200Z - 191200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Thunderstorm development will be possible late tonight from parts of
   the Texas Hill Country northeastward to the Arklatex. No severe
   thunderstorms are expected.

   ...DISCUSSION...
   An upper-level ridge will move into the Ohio and Tennessee Valleys
   today as an upper-level trough moves across the Desert Southwest.
   Ahead of the western U.S. trough, weak moisture return will take
   place across the southern Plains. A low-level jet is forecast to
   strengthen across the eastern third of Texas tonight. In response,
   lift may be sufficient for isolated thunderstorm development from
   the Texas Hill Country northeastward to the Arklatex. However,
   instability will be insufficient for a severe threat. Elsewhere
   across the continental United States, thunderstorm development is
   not expected today or tonight.

   ..Broyles.. 12/18/2020

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   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1300Z