SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0212 AM CDT Mon Oct 12 2020 Valid 141200Z - 151200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not forecast across the contiguous United States on Wednesday. ...Synopsis and Discussion... Enhanced, generally westerly flow across the northern half of the CONUS should transition to an amplifying large-scale upper trough across the central states on Wednesday. At the surface, low pressure initially over the northern Plains should develop east-northeastward across the Upper Midwest, Great Lakes, and southern Ontario through the period. A trailing cold front is forecast to sweep southeastward across much of the Plains and upper/mid MS Valley. Modest low-level moisture return may occur across parts of the southern Plains and Southeast ahead of the front. However, capping across the southern Plains will likely prohibit convective development, while negligible ascent and poor mid-level lapse rates should limit thunderstorm potential across the Southeast. Thunderstorms also appear unlikely across the Upper Midwest/Great Lakes in advance of the developing upper trough, as instability is forecast to be very meager. ..Gleason.. 10/12/2020
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