Subj : DAY48SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Sat May 27 2023 08:39:57

ACUS48 KWNS 270839
SWOD48
SPC AC 270838

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0338 AM CDT Sat May 27 2023

Valid 301200Z - 041200Z

....DISCUSSION...
A generally weak deep-layer flow and low amplitude upper pattern
will persist for much of the Day 4-8 period. The blocking regime
over the Southeast should diminish on Day 4/Tue or Day 5/Wed as an
upper low near the coastal Carolinas weakens. At the same time, an
upper trough will develop over the West.  This trough is forecast to
persist across the West through around Day 7/Fri. Some enhanced
southwesterly flow and subtle shortwave impulses ejecting through
the southern stream of the western trough will impact portions of
the southern Plains through the weekend. This could provide support
for periods of strong to severe thunderstorms starting around Day
5/Wed. However, vertical shear is expected to remain modest in the
low amplitude regime. Furthermore confidence/predictability is low
given a lack of stronger synoptic support, precluding severe
probabilities at this time.

...Leitman.. 05/27/2023

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