Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0325 AM CDT Sun Sep 28 2025 Valid 011200Z - 061200Z ...DISCUSSION... Strong cyclogenesis within the westerlies near the Aleutians late this week into next weekend may lead to the development of an increasingly prominent blocking pattern over the eastern mid-latitude Pacific into western North America. This may include an evolving low near the California coast, to the southeast of building mid/upper high over the northeastern Pacific by the end of the period. In general, though, stronger westerlies are forecast to remain confined to the northern mid-latitudes, with little potential for substantive cyclogenesis to the lee of the Rockies, and moist return flow off the Gulf Basin. This likely will maintain generally low convective potential across the nation.
