Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0303 AM CST Sat Dec 12 2020 Valid 151200Z - 201200Z ...DISCUSSION... Medium-range model output suggests that initially northwest flow across much of Canada will transition to a more zonal regime, while a belt of westerlies emanating from the mid-latitude Pacific remains a prominent influence across much of the U.S. through the middle and latter portions of next week. As this occurs, it appears that an initially amplified trough to the lee of the southern Rockies will lose amplitude, with the most significant embedded perturbation accelerating toward the Mid Atlantic, where it may support significant surface cyclogenesis offshore Wednesday into Thursday. An additional perturbation or two may follow within this stream, inland across the Pacific coast and through the U.S. by early next weekend. However, models indicate little in the way of substantive surface cyclogenesis and inland return flow of moisture off the Gulf of Mexico, resulting in the maintenance of generally stable conditions and low convective potential.
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