Subj : DAY48SVR: Nws Storm Prediction Center Norman Ok To : wx-storm@lists.illinois.edu From : COD Weather Processor Date : Fri Aug 15 2025 08:47:23 ACUS48 KWNS 150845 SWOD48 SPC AC 150844 Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0344 AM CDT Fri Aug 15 2025 Valid 181200Z - 231200Z ....DISCUSSION... ....Monday/Day 4 to Wednesday/Day 6... At mid-levels, heights are forecast to rise across the north-central states on Monday and Tuesday, as west-northwesterly flow remains from parts of the northern Plains to the Eastern Seaboard. Thunderstorm development will be possible each day along parts of a front, which is forecast to be slow-moving and situated from the northern Plains east-southeastward into the southern Great Lakes. An isolated severe threat will be possible in the vicinity of the front within a moderately unstable airmass on Monday from parts of South Dakota eastward into the western Great Lakes. Storms with an isolated severe threat will again be possible on Tuesday. The greatest convective coverage is forecast to be further to the east from the southern Great Lakes into the central Appalachians. On Wednesday, isolated to scattered thunderstorms are expected over parts of the mid Mississippi and lower Ohio Valleys. In this area, large-scale ascent and deep-layer shear are forecast to be weak suggesting the potential for severe storms will remain low. ....Thursday/Day 7 and Friday/Day 8... On Thursday, a cold front is forecast to move into the northern Plains. Thunderstorm development will be possible ahead of the front along an axis of instability from parts of South Dakota into northwestern Minnesota. An isolated severe threat may develop with this activity during the afternoon and evening. The potential for isolated severe is forecast to shift southeastward into the mid Missouri upper Mississippi Valleys on Friday. However, uncertainty is low at this range in the forecast period. ...Broyles.. 08/15/2025 = = = 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) .