BBS: TELESC.NET.BR Assunto: DAY2SVR: Nws Storm Prediction Center Norman Ok De: COD Weather Processor Data: Tue, 28 Apr 2026 17:32:26 +0000 ----------------------------------------------------------- ACUS02 KWNS 281732 SWODY2 SPC AC 281730 Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1230 PM CDT Tue Apr 28 2026 Valid 291200Z - 301200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN A CORRIDOR FROM SOUTH-CENTRAL TEXAS INTO PARTS OF THE SOUTHEAST...AND ALSO FROM THE ALLEGHENY PLATEAU INTO THE MID ATLANTIC... ...SUMMARY... Widely scattered strong to severe storms may impact a corridor from south of the Texas Big Bend through the north central Gulf Coast vicinity Wednesday afternoon into evening, with additional strong storms posing at least some risk for severe weather across the Allegheny Plateau into the Mid Atlantic. ...Lower Rio Grande Valley into parts of the Southeast... Outflow associated with extensive D1/Tuesday convection is forecast by most guidance to weaken and become increasingly ill defined near the northwest/north-central Gulf Coast through the day, with the trailing primary cold front extending from south-central TX into the Southeast by afternoon. Details of convective evolution through the day/evening remain unclear, but with moderate midlevel flow and deep-layer shear overspreading residual moderate to strong buoyancy, the environment will again conditionally favor an organized severe threat through the day and evening. Some guidance (both regional/global and CAMs) suggests that a low-amplitude midlevel vorticity maximum may emerge from northern Mexico and initiate storm development across parts of the Hill Country and central TX, during the morning, with at least isolated development also possible into parts of the ArkLaTex/lower MS Valley and Southeast, near the cold front and any remnant outflow boundary. Initial discrete development could pose a threat of isolated large hail, with a conditional very large hail risk with any robust supercell. With relatively unidirectional deep-layer westerly flow, one or more eastward-moving clusters may evolve with time and track in the vicinity of the cold front, posing a threat of at least isolated wind damage. Parts of the region may require higher severe probabilities, once mesoscale details come into better focus with time. ...Allegheny Plateau into the Mid Atlantic... Within a broad large-scale mid/upper-level trough covering much of the eastern CONUS, a vigorous shortwave trough is forecast to move from the Midwest to the Mid Atlantic on Wednesday. A surface low will move from near the upper OH Valley toward the Delmarva region, as a trailing cold front moves through parts of the central/southern Appalachians into parts of VA/MD and the Carolinas. Potential for substantial destabilization in the wake of morning precipitation remains uncertain from parts of the Allegheny Plateau into the Mid Atlantic. Ascent related to the approaching shortwave trough and favorable wind profiles could support development of strong clusters or marginal supercells, if sufficient destabilization occurs. Some threat for damaging wind, a brief tornado or two, and perhaps isolated hail could develop, though the magnitude and coverage of these threats remain too uncertain for a categorical upgrade at this time. Higher severe probabilities may eventually be needed, if confidence increases in the development of sustained supercells and/or organized clusters. ..Dean.. 04/28/2026 $$ = = = 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: Capitol City Online (1:2320/107) ----------------------------------------------------------- [Voltar]