Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0325 AM CST Mon Dec 08 2025 Valid 111200Z - 161200Z ...DISCUSSION... Downstream of a prominent blocking high, which may be maintained near/north of the Aleutians vicinity through this period, latest medium-range output suggests that flow across the mid-latitude Pacific through North America may trend less amplified by next weekend into early next week. Relatedly, guidance is becoming more unclear how impactful cold air, initially building to the lee of the Canadian/northern U.S. Rockies by late this week, will be in terms of drying across the northern Gulf Basin, as it noses south/southeastward in one or two surges through the remainder of the period. It now appears at least a bit more of a possibility that a weak to modest elevated, if not boundary-layer based, Gulf moisture return could occur on a developing southerly return flow, across parts of the northwestern Gulf coast into southern Great Plains next weekend into early next week. This could promote destabilization supportive of a risk for thunderstorm development. However, with surface cyclogenesis appearing unlikely to the lee of the southern Rockies, the potential for severe weather appears low in the presence of limited large-scale forcing for ascent and vertical shear.
