Subj : DAY3SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Mon Jul 21 2025 19:28:49

ACUS03 KWNS 211927
SWODY3
SPC AC 211926

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0226 PM CDT Mon Jul 21 2025

Valid 231200Z - 241200Z

....THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE
UPPER MISSISSIPPI VALLEY TO UPPER GREAT LAKES REGION...

....SUMMARY...
A few organizing clusters of storms posing a risk for severe wind
and perhaps some hail are possible across parts of the Upper Midwest
into adjacent Great Lakes region Wednesday through Wednesday night.

....Discussion...
An upper ridge will exist over the eastern CONUS, with a belt of
moderate winds aloft from the upper MS Valley and Great Lakes. A
surface trough will extend roughly from Lake Superior southwestward
into NE, with rich moisture to the south and east.

Storms are likely to be ongoing over the upper Great Lakes region
early on Wednesday, supported by southwest winds at 850 mb within a
theta-e plume. Some of this early activity could product strong wind
gusts.

Behind this activity, destabilization will occur near the surface
trough, and new development is likely during the late afternoon from
MN into SD and NE. With only subtle features aloft, this activity
will likely develop into clusters of storms with east/southeastward
propagation and attendant outflow/severe gust threat.

Otherwise, isolated severe cells with hail will be possible over the
High Plains over southeast MT, eastern WY and CO, as moisture backs
westward into the steeper lapse rate environment. Longer hodographs
over MT/WY could support a supercell or two, and this area will be
monitored for higher probabilities in later outlooks.

...Jewell.. 07/21/2025

$$

= = =
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)

.