Subj : DAY3SVR: Nws Storm Prediction Center Norman Ok To : wx-storm@lists.illinois.edu From : COD Weather Processor Date : Thu Sep 18 2025 19:21:37 ACUS03 KWNS 181921 SWODY3 SPC AC 181920 Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0220 PM CDT Thu Sep 18 2025 Valid 201200Z - 211200Z ....NO SEVERE THUNDERSTORM AREAS FORECAST... ....SUMMARY... Organized severe thunderstorms are not currently expected on Saturday. ....Synopsis... A broad mid/upper-level trough will remain across parts of the central CONUS on Saturday, as multiple embedded shortwaves traverse parts of the northern Plains and Upper Midwest. Farther west, a mid/upper-level trough offshore of southern CA is forecast to move slowly eastward, while a stronger mid/upper-level shortwave trough will approach the Pacific Northwest later in the period. The broadly cyclonic flow regime will support thunderstorm potential across a large part of the CONUS, though generally weak deep-layer shear should tend to limit the organized severe threat. Scattered storms will again be possible across the Upper Midwest/Great Lakes, where relatively cool temperatures aloft could support a few strong storms. Morning convection is expected across parts of KS, with redevelopment possible during the afternoon from parts of OK/KS into the mid MS Valley. Depending on the extent of heating/destabilization, strong storms will be possible during the afternoon/evening across this region, though potential for a corridor of more organized severe threat is quite uncertain at this time. Isolated strong storms will also be possible in the CO Front Range vicinity, where somewhat more favorable deep-layer shear may be in place, but it remains uncertain if destabilization will be sufficient to support a severe-hail threat. ...Dean.. 09/18/2025 $$ = = = 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) .