Subj : DAY3SVR: Nws Storm Prediction Center Norman Ok To : wx-storm@lists.illinois.edu From : COD Weather Processor Date : Wed Aug 13 2025 07:32:30 ACUS03 KWNS 130731 SWODY3 SPC AC 130730 Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0230 AM CDT Wed Aug 13 2025 Valid 151200Z - 161200Z ....THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER A SMALL PART OF THE NORTHERN PLAINS... ....SUMMARY... At least isolated severe storms might occur over parts of the northern Plains on Friday. ....Discussion... An upper trough will move eastward toward Ontario and Hudson Bay on Friday, with an upper high building over the central Plains. Moderate westerlies aloft over the northern Plains will persist well south of the upper trough, though gradual warming is forecast. Meanwhile, a weak midlevel trough should remain over pats of the Great Basin, providing cool temperatures aloft. At the surface, a cold front will push eastward across northern MN and into SD, and will likely decelerate as the upper wave moves farther away. A surface low/trough will extend from southeast MT across western SD and NE during the afternoon, with backed surface winds maintaining low-level moisture across the mid MO Valley and toward the Black Hills. Although large-scale ascent will be minimal given the upper ridging, strong heating over the high Plains will yield isolated high-based storms initially. Some storms may pose a wind and hail risk from the Black Hills region eastward near the stalled frontal zone. Predictability is fairly low for potential farther east toward MN/IA, however, the air mass will remain unstable, and persistent low-level warm advection could fuel an MCS with gusty winds. ...Jewell.. 08/13/2025 $$ = = = 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) .