Subj : DAY3SVR: Nws Storm Prediction Center Norman Ok To : wx-storm@lists.illinois.edu From : COD Weather Processor Date : Sat Sep 13 2025 07:01:57 ACUS03 KWNS 130701 SWODY3 SPC AC 130700 Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0200 AM CDT Sat Sep 13 2025 Valid 151200Z - 161200Z ....NO SEVERE THUNDERSTORM AREAS FORECAST... ....SUMMARY... Organized severe thunderstorm potential appears generally low on Monday. ....Synopsis and Discussion... A pair of upper troughs/lows should be in place over the northern Rockies and northern Plains Monday morning. The lead wave is forecast to advance northward from the Dakotas and MN into central Canada through the day, while the trailing low gradually opens and weakens as it moves slowly eastward over the northern Rockies/High Plains. A weak surface low should develop northward from ND into Manitoba by Monday evening, with a weak front extending southward from this low across parts of the northern/central Plains. Organized severe thunderstorm potential is currently expected to remain fairly limited, with modestly enhanced but meridional/southerly mid/upper-level flow across MN limiting deep-layer shear over the moderately unstable warm sector. Better large-scale ascent is also forecast to gradually shift northward into central Canada through the day as well. Given these potential limiting factors, low severe probabilities have not been included across northern MN and vicinity at this time. Elsewhere, general thunderstorms should occur beneath the upper low across the northern Rockies/High Plains, but both instability and deep-layer shear are forecast to remain weak across these regions. Isolated convection may also develop Monday afternoon and evening with southward extent along a surface lee trough across the southern/central Plains, but weak forcing aloft should tend to limit overall coverage. Other convection may also occur along a low-level moist axis extending from parts of the Ozarks/Mid-South northward into the Upper Midwest. ...Gleason.. 09/13/2025 $$ = = = 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) .