749 
ACUS03 KWNS 180828
SWODY3
SPC AC 180827

Day 3 Convective Outlook  
NWS Storm Prediction Center Norman OK
0227 AM CST Thu Dec 18 2025

Valid 201200Z - 211200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Isolated thunderstorms are possible across western Washington and
far northwest Oregon on Saturday.

...Synopsis...
A strong mid-level jet streak over the northern Plains Saturday
morning will move east as a mid-level trough amplifies across the
Great Lakes. As this occurs, a surface cold front will move from the
Plains Saturday morning to near the Appalachians and extending back
into East Texas by early Sunday morning. 

...East Texas into Louisiana...
Low-level moisture return will bring low to mid 60s dewpoints
northward across East Texas and Louisiana on Saturday and Saturday
evening. Weak to potentially moderate instability is forecast to
develop. However forcing will be minimal with rising heights aloft
and a weakening low-level jet. In addition, forecast soundings show
warm mid-level temperatures which will likely keep the airmass
capped. Therefore, thunderstorms are not expected across East Texas
and Louisiana on Saturday night/early Sunday.

...Pacific Northwest..
Persistent onshore flow with cool temperatures aloft will result in
persistent convective activity across western Washington and
northwest Oregon on Saturday. Forecast soundings show weak
instability and equilibrium levels near or slightly above -20C which
may support some isolated thunderstorms.

..Bentley.. 12/18/2025

$$