SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0957 AM CST Sun Dec 21 2025 Valid 211630Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected today. Thunderstorm potential will be limited across the CONUS. Strong onshore flow and cold temperatures aloft will pose a risk of a few lightning flashes today and tonight over portions of the WA/OR coast and parts of northern CA. Low-level warm advection and an approaching cold front could result in isolated thunderstorms this afternoon over parts of southern LA/MS, and late tonight over south TX. No severe storms are anticipated today. ..Hart/Karstens.. 12/21/2025
