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...
Thunderstorms will be possible across the southwestern U.S. today.
Severe weather is not expected across the continental United States
today or tonight.
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.
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NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1300Z