Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0320 AM CST Sun Dec 21 2025 Valid 241200Z - 291200Z ...DISCUSSION... Medium-range model guidance initially shows a pattern featuring an upper ridge over the central CONUS and trough along the West Coast, transitioning to a more progressive flow regime and lowering heights across the Great Plains during the Thursday-Saturday (D5-D7) period. The inland-moving West Coast trough will potentially yield isolated to scattered thunderstorms on Wednesday into early Thursday over portions of southern and central CA and perhaps a localized risk for a couple of stronger thunderstorms. Details concerning this convective scenario and overall magnitude of severe risk preclude severe highlights. Farther east, some moisture return northward into the southern Great Plains and MS Valley through Friday will likely be modulated by frontal advancements during the latter part of extended period.
