Subj : DAY48SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Tue Aug 26 2025 07:49:10

ACUS48 KWNS 260749
SWOD48
SPC AC 260747

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0247 AM CDT Tue Aug 26 2025

Valid 291200Z - 031200Z

....DISCUSSION...
An upper trough will eject into the Atlantic this weekend as weak
upper ridging builds into the central U.S. and an upper-low meanders
over the Pacific Northwest. An upper trough will then develop and
gradually amplify over the Upper MS Valley through early next week.
A surface cold front will sag southward through the day on Day
4/Friday across portions of the southern Plains into the Lower MS
Valley, where rich moisture and appreciable instability will be in
place to support a threat for at least scattered strong
thunderstorms. By the weekend into early next week, surface lee
troughing across the Plains will encourage the northwestward
advection of low-level moisture beneath modest lapse rates,
resulting in marginal to moderate instability across the High Plains
Days 5-8/Saturday-Tuesday. Southeasterly 850 mb winds, overspread by
northwesterly flow at 500 mb, may encourage enough wind shear to
support isolated severe storms along the central High Plains
Saturday-Tuesday.

...Squitieri.. 08/26/2025

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