RSS Mesoscale Discussions from Storm Prediction Center
No watches are valid as of Sun Dec 21 05:38:01 UTC 2025.
No Mesoscale Discussions are in effect as of Sun Dec 21 05:38:01 UTC 2025.
SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1114 PM CST Sat Dec 20 2025
Valid 211200Z - 221200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Severe thunderstorms are not expected today.
...Pacific Northwest...
Low-amplitude short-wave trough is forecast to approach the Pacific
Northwest coast later this evening as modest midlevel height falls
spread inland across WA/OR. Latest model guidance suggests weak
buoyancy will persist much of the period, particularly near the
coast, where onshore flow will contribute to SBCAPE generally less
than 100 J/kg. As freezing levels lower, shallow convection may
penetrate levels necessary for lightning discharge. For these
reasons will maintain 10% probability for isolated thunderstorms,
primarily near the coast.
..Darrow/Squitieri.. 12/21/2025
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