Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0649 PM CST Sun Dec 21 2025

Valid 220100Z - 221200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not expected tonight.

...01z Update...

Potential for lighting is negligible across most of the CONUS
tonight. A few exceptions are along the LA and south TX coasts, and
across portions of the Pacific Northwest. Isolated thunderstorms
have recently developed along a frontal zone across southern LA.
This activity will gradually propagate off the LA coast later this
evening and focus offshore. Some risk for weak convection also
extends across south TX along this frontal zone.

A notable short-wave trough is advancing toward the WA/OR coast
early this evening. A few flashes of lightning have been observed
off Vancouver Island with this feature. Some risk for isolated
thunderstorms continues near the coast as the surface front surges
inland and profiles cool.

..Darrow.. 12/22/2025