BBS: TELESC.NET.BR Assunto: DAY2SVR: Nws Storm Prediction Center Norman Ok De: COD Weather Processor Data: Sat, 21 Mar 2026 06:02:48 +0000 ----------------------------------------------------------- ACUS02 KWNS 210602 SWODY2 SPC AC 210601 Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0101 AM CDT Sat Mar 21 2026 Valid 221200Z - 231200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE OHIO VALLEY... ...SUMMARY... Severe thunderstorms with large hail and severe wind gusts are expected on Sunday afternoon and evening across parts of the Ohio Valley. ...Ohio Valley/Mid Mississippi Valley... At mid-levels on Sunday, an amplifying trough will move quickly east-southeastward across the north-central U.S, as an associated jet streak translates eastward into the southern Great Lakes. At the surface, a cold front will advance southward into the Ohio Valley. South of the front, moderate instability will develop across a moist airmass by early afternoon, with surface dewpoints in the lower to mid 60s F. Warming surface temperatures and increasing low-level convergence will result in convective initiation along parts of the front during the mid to late afternoon. Storm coverage is forecast to gradually increase as several clusters or line segments with a severe threat move southeastward across the Ohio Valley during the late afternoon and early evening. During the afternoon from Cincinnati to Pittsburgh, forecast soundings gradually increase MLCAPE in the 1500 to 2000 J/kg range. Forecasts just ahead of the front suggest that winds will be veered to the southwest near the surface, but that strong speed shear will exist in the lower to mid-levels. 0-6 km shear is forecast to range from 40 to 50 knots, which should be favorable for severe thunderstorm development. 700-500 mb lapse rates in the 7.0 to 7.5 C/km range should support supercells with large hail. The supercell threat is expected to be greatest early in the event, when cells are more likely to be discrete. A threat for severe wind gusts is also expected. The wind-damage threat should be concentrated along short line segments that form in the late afternoon and early evening. A marginal tornado threat will also be possible. Further west-southwest into the lower Ohio Valley and mid Mississippi Valley, the models are forecasting a stout capping inversion to the south of the front over much of the warm sector. Near the front in the early evening, the cap is forecast to weaken. This combined with increasing low-level convergence near the front should be enough for isolated convective initiation. A marginal threat for hail and severe wind gusts would be possible with the stronger cells that can initiate and persist. ..Broyles.. 03/21/2026 $$ = = = 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]