248 
ACUS03 KWNS 220829
SWODY3
SPC AC 220828

Day 3 Convective Outlook  
NWS Storm Prediction Center Norman OK
0228 AM CST Mon Dec 22 2025

Valid 241200Z - 251200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF
CENTRAL AND SOUTHERN COASTAL CALIFORNIA AND PARTS OF THE CALIFORNIA
CENTRAL VALLEY...

...SUMMARY...
Isolated strong to locally severe thunderstorms are possible on
Wednesday and Wednesday night across portions of California.

...California...
An upper trough over the eastern Pacific and upper ridge over the
Great Plains will maintain a belt of strong to intense cyclonic flow
across CA north-northeastward into the Interior West.  A lead
shortwave trough will move from the OR/CA border northward into WA
during the day, while an upstream disturbance moves from the eastern
Pacific northeastward into central and northern CA after dark.  A
prolonged period of scattered showers and episodic periods of
isolated thunderstorms are forecast across CA on Wednesday into
Wednesday night.  Relatively cold mid-level temperatures (-20 to -24
deg C at 500 mb) will aid in the development of weak instability
during the afternoon across portions of the central valley. 
Elongated hodographs coupled with the potential for a short-duration
period of modest surface-based destabilization could yield an
isolated risk for a couple of weakly rotating storms.  A risk for
localized squalls moving inland near the immediate coast from parts
of southern into central CA may focus primarily late Wednesday into
Wednesday night ahead of the approaching disturbance.  

Elsewhere, tranquil conditions will prevail across much of the
CONUS.

..Smith.. 12/22/2025

$$