SPC AC 210508

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1208 AM CDT Sun Oct 21 2018

   Valid 211200Z - 221200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Thunderstorms will be possible across the southwestern U.S. today.
   Severe weather is not expected across the continental United States
   today or tonight.

   ...DISCUSSION...
   An upper-level trough will move eastward away from the East Coast
   today as surface high pressure settles in across the eastern third
   of the nation. Another upper-level trough will approach Baja
   California. Moisture advection ahead of the trough will increase
   surface dewpoints across parts of the southwestern U.S. In response,
   enough instability should be in place by afternoon for thunderstorm
   development from Arizona northward into Utah and westward into parts
   of Nevada and California. In spite of this, instability and shear is
   not expected to be sufficient for a severe threat.

   ..Broyles/Cook.. 10/21/2018

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