Subj : DAY3SVR: Nws Storm Prediction Center Norman Ok To : wx-storm@lists.illinois.edu From : COD Weather Processor Date : Fri Apr 25 2025 19:33:41 ACUS03 KWNS 251932 SWODY3 SPC AC 251931 Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0231 PM CDT Fri Apr 25 2025 Valid 271200Z - 281200Z ....THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF NEBRASKA AND VICINITY... ....SUMMARY... Isolated severe storms are possible across the southern High Plains and central Plains Sunday afternoon/evening. Scattered severe storms are possible across the northern Plains and Upper Midwest Sunday evening/night. ....Synopsis... Continued eastward progression of the western U.S. upper low/trough will occur Sunday. Eventually, this trough will begin to displace persistent central U.S. upper ridging, with the first effects -- in the form height falls -- spreading gradually across the Plains Sunday afternoon through Sunday night. Ahead of the trough, a cold front crossing the western U.S. will begin to emerge into the Plains, trailing southwestward from a low shifting gradually into/across the Nebraska vicinity. By the end of the period, this front should extend from the Mid Missouri Valley south-southwestward to West Texas. ....The Plains... Low-level moistening spreading northward across the Plains in advance of the approaching front will combine with daytime heating to result in moderate pre-frontal destabilization. The effects of ridging-induced subsidence -- in the form of boundary-layer capping -- will persist through much of the day, hindering more widespread development of diurnal storms. By late afternoon/early evening however, isolated storm development is expected, likely most widespread across the Nebraska vicinity just ahead of the surface low shifting into the region. Here, increasing mid-level flow atop low-level southerlies will provide sufficient shear for a few severe/rotating storms, likely accompanied by an all-hazards severe risk. Farther south along the advancing front, storms should remain much more isolated, but would likely pose local severe risk given a thermodynamic and kinematic environment that would support organized/rotating storms. Overnight, an increasing southerly low-level jet -- and associated warm advection across the Dakotas atop the warm front -- should sustain late-period storms, and at least some severe risk. ...Goss.. 04/25/2025 $$ = = = 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 3.20-Linux * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (1:2320/105) .