Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0653 AM CST Sun Dec 21 2025
Valid 211300Z - 221200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Severe thunderstorms are not expected today.
...Discussion...
A progressive/zonal upper-flow pattern will continue over the CONUS.
A low-amplitude shortwave trough will move inland across the Pacific
Northwest by tonight. Weak buoyancy and cooling temperatures aloft
may become sufficient for isolated lightning flashes, particularly
near the Washington coast. Farther south, a moisture-rich plume and
a marginally favorable thermodynamic environment may allow for some
lighting flashes across northern California.
Elsewhere, a relatively moist airmass near/south of a
southward-moving front, along with continued weak warm/moist
advection, will probably be conducive for isolated thunderstorms
mainly across southern portions of Louisiana and Mississippi today.
..Guyer/Marsh.. 12/21/2025
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