Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0341 AM CDT Tue Sep 29 2020 Valid 021200Z - 071200Z ...DISCUSSION... Medium-range model guidance is in good agreement that upper troughing will be in place across much of the central and eastern CONUS early D4/Friday. A shortwave trough is currently expected to traverse this trough, moving across the northern/central Plains on D4/Friday before continuing across the mid MS and OH Valleys on D5/Saturday. Another shortwave trough may follow quickly in the wake of the first. This series of shortwaves will help maintain a stable continental air mass across the majority of the central and eastern CONUS. Some thunderstorms do appear possible on across portions of the southern Plains on D5/Saturday and the Lower MS Valley on D6/Sunday, ahead of a cold front sweeping southward/southeastward. Marginal instability is currently expected to limit coverage of severe thunderstorms.
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