SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0141 AM CST Tue Dec 01 2020 Valid 031200Z - 041200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible across portions of the Lower Mississippi Valley and Southeast on Thursday. ...Synopsis... At the beginning of the period, a pair of upper lows, one centered over northeast OK and the other over the central NM/AZ, are expected to be embedded within an elongated upper trough extending from the Mid MS Valley through the Southwest. This upper troughing will likely be maintained throughout the period as the easternmost upper low devolves into an open wave and moves across the Mid MS Valley into the Lower OH Valley. Enhanced mid-level flow attendant to this upper low/shortwave will spread northeastward from the Southern Plains through the OH Valley. The surface low associated with the eastern upper low is forecast to begin the period over eastern OK. This low is expected to fill throughout the day while a secondary low develops farther south over the Lower MS Valley. Upper 50s/low 60s dewpoints are anticipated ahead of this secondary low and attendant cold front. Daytime heating will be tempered by abundant cloud cover, but enough low-level moisture is expected to be in place to support modest instability and the development of isolated thunderstorms. This instability will likely be displaced south of the stronger low-level and mid-level flow, limiting vertical shear and keeping severe potential very low. ..Mosier.. 12/01/2020
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