Subj : DAY48SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Sun Sep 21 2025 07:41:29

ACUS48 KWNS 210741
SWOD48
SPC AC 210740

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0240 AM CDT Sun Sep 21 2025

Valid 241200Z - 291200Z

....DISCUSSION...
A mid-level trough will amplify across the eastern CONUS on
Wednesday and Thursday with differing model solutions of the trough
evolution by next weekend and beyond. Regardless of the exact
solution, severe weather chances should be low from Saturday and
beyond as high pressure builds into the eastern CONUS and pushes
moisture offshore into the Atlantic and Gulf. Some severe weather is
possible across portions of the Southeast on Day 4/Wed to Day 6/Fri
as moisture remains onshore ahead of the mid-level trough.

....D4/Wed - Lower Mississippi River Valley...
Upper 60s to low 70s dewpoints are anticipated within the Lower
Mississippi River Valley on Wednesday. A zone of moderate
instability may develop within this moisture plume from Louisiana
into Arkansas and Mississippi. Guidance varies greatly on the
evolution of the mid-level trough as it advances east on Wednesday.
This will have a significant impact on the specific location and
intensity of any severe weather threat on Wednesday. However, even
if a less amplified, more subdued mid-level pattern evolves, some
severe weather could exist across the Lower Mississippi Valley as
moderate mid-level flow overspreads moderate instability within the
region.

...Bentley.. 09/21/2025

= = =
To unsubscribe from WX-STORM and you already have a login, go to
https://lists.illinois.edu and use the "Unsubscribe" link.  Otherwise email
Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM.

--- SBBSecho 3.28-Linux
 * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (1:2320/105)

.