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