Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0326 AM CDT Sat Sep 18 2021 Valid 211200Z - 261200Z ...DISCUSSION... Medium-range model output is quite varied concerning mid/upper flow developments from the middle of the coming work week into next weekend. It appears that large-scale ridging may generally prevail across much of the West into the Great Plains, with troughing across and east of the Mississippi Valley. However, short wave developments remain much more unclear, starting with the evolution of one significant short wave trough forecast to dig into the central Great Plains at the outset of the period. It may be that this contributes to the evolution of a broad mid-level low over the lower Ohio Valley vicinity by mid to late week. However, it is not certain that this will be accompanied by anything more than weak cyclogenesis, and potential for substantive destabilization with an appreciable risk of severe weather appears relatively low. However, given the apparent low pattern predictability, it is possible that this could still change in later outlooks for this period. Read more LIVE: spc.noaa.gov
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