SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0625 AM CST Wed Dec 31 2025 Valid 311300Z - 011200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible along coastal southern California very late in the period. ...Southern CA... A southern-stream upper-level trough will approach the southern CA coast late tonight. Latest model guidance suggests increasing large-scale ascent will approach the coast, contributing to isolated convection along/ahead of a weak front as it surges inland, primarily after 09z. Forecast soundings along the coast suggest thunderstorms should be elevated in nature, with initial convection likely rooted at or above 850mb. Weak buoyancy and shear suggests minimal potential for severe storms prior to 12z Thursday. ..Bunting/Weinman.. 12/31/2025
