Subj : DAY48SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Tue Aug 29 2023 08:52:00

ACUS48 KWNS 290851
SWOD48
SPC AC 290850

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0350 AM CDT Tue Aug 29 2023

Valid 011200Z - 061200Z

....DISCUSSION...
An upper trough/low is forecast to continue digging southward along
and near the West Coast on Day 4/Friday. Greater low-level moisture
emanating from the Gulf of California and southern AZ may attempt to
advance northward across parts of the lower CO River Valley and into
southern NV/UT by Friday afternoon. Even with this potential, it
still appears that instability will remain too weak to support any
more than an isolated/marginal severe threat at best Friday across
southern portions of the Great Basin. This upper trough/low should
advance slowly eastward across the Great Basin and towards the
central Rockies through the upcoming weekend. Although details
remain somewhat unclear, there is a signal in guidance that the
upper trough/low may eventually eject east-northeastward across the
northern/central Plains by early next week. While low-level moisture
should initially remain too limited for a meaningful severe threat,
enough instability may develop by Day 8/Tuesday to support some
severe risk from parts of the central Plains into the Upper Midwest.

...Gleason.. 08/29/2023

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