SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0628 AM CST Sat Dec 27 2025 Valid 271300Z - 281200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight across the contiguous United States. ...Synopsis... Water-vapor imagery this morning shows an upper trough over the West. This upper feature will move east and reach the Dakotas and central Rockies by early Sunday morning. Ahead of this trough, upper ridging will occur over the MS/OH Valleys with a warm conveyor focused over the lower MO Valley. Low 60s F dewpoints will stream north out of the southern Plains and lower MS Valley toward the lower MO/Mid MS Valley late and ahead of an approaching cold front pushing southeast into the KS/IA vicinity. Weak instability is forecast to gradually develop tonight over the lower MO/mid MS Valley with an increase in showers and isolated thunderstorms evolving primarily after midnight. Despite strong effective shear, current thinking is storm intensity will be limited with the elevated storm activity and hail potential will remain sub severe. ..Smith/Weinman.. 12/27/2025
