SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1107 PM CST Sun Dec 27 2020 Valid 281200Z - 291200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible along the coast of southern California. ...Southern California... Strong mid-level height falls are forecast to spread across southern CA early in the day1 period as a strong 500mb speed max translates toward the lower CO River Valley. Along and north of this jet, cooling profiles and steepening lapse rates will become increasingly favorable for weak convection. Forecast soundings along the southern CA coast suggest surface-based convection is possible within an environment characterized by a few hundred J/kg CAPE. Lightning probabilities will gradually sag south during the day, ultimately waning during the late evening hours near the international border. ..Darrow.. 12/28/2020
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