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
