Day 4-8 Outlook

Day 4-8 Outlook Image

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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