BBS: TELESC.NET.BR Assunto: DAY3SVR: Nws Storm Prediction Center Norman Ok De: COD Weather Processor Data: Sun, 26 Apr 2026 19:21:01 +0000 ----------------------------------------------------------- ACUS03 KWNS 261920 SWODY3 SPC AC 261919 Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0219 PM CDT Sun Apr 26 2026 Valid 281200Z - 291200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TUESDAY AFTERNOON AND EVENING IN A CORRIDOR ACROSS THE SOUTHEASTERN GREAT PLAINS INTO LOWER OHIO VALLEY... ...SUMMARY... Scattered strong to severe thunderstorm development is possible Tuesday afternoon and evening in a corridor from the southeastern Great Plains into lower Ohio Valley. More isolated severe storm development may extend into central/western Texas. ...Synopsis... A broad cyclone will continue to deepen while migrating northeast of the upper Great Lakes region through the southeastern Hudson Bay vicinity Tuesday through Tuesday night. As a secondary shortwave trough deepens across the central Plains, another surface low will develop near the Oklahoma/Texas Panhandle region. An elongated cold frontal zone will extend from the Panhandles across eastern Oklahoma into the Mississippi and Ohio Valley. Widely scattered shower and thunderstorm development is likely along this boundary as it sags slowly south and east. The evolution of features from D2 Monday into D3 Tuesday, including any remnant outflow boundaries and ongoing storms ect remain uncertain and thusly leads to some uncertainty in the D3 forecast. It does appear that the parameter space along and south of the cold front from eastern Oklahoma/northeastern Texas northward into the Mississippi River Valley would be supportive of supercells, given strong mid-level flow and sufficient deep layer shear. These would likely pose some risk for large to very large hail, damaging wind, and perhaps tornadoes. Supercells will also be possible near/north of the boundary across northern Missouri into western Kentucky, with a risk for elevated storms and large hail. It is likely give the orientation of shear parallel to the boundary that clustering/upscale growth will be favored through time, with perhaps several clusters/bowing segments and some increase of the damaging wind threat into the Mississippi Valley/Middle Tennessee/Ohio Valley through the evening. A broad 15% area was maintained, in alignment with D3 ML CSU/NSSL guidance given uncertainty. A corridor of higher probabilities may be warranted as details become more clear. Further south and west along the dryline in central Texas, there is some low chances that an isolated storm or two could develop in the afternoon. Forcing for ascent will be weaker across this region, with MLCIN in place through the morning. Nonetheless, CIN does weaken through the early afternoon amid deeply mixed profiles and steep lapse rates. A supercell or two could pose a risk for large hail in this region. ..Thornton.. 04/26/2026 $$ = = = 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]