BBS: TELESC.NET.BR Assunto: DAY3SVR: Nws Storm Prediction Center Norman Ok De: COD Weather Processor Data: Wed, 27 May 2026 19:31:56 +0000 ----------------------------------------------------------- ACUS03 KWNS 271931 SWODY3 SPC AC 271930 Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0230 PM CDT Wed May 27 2026 Valid 291200Z - 301200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS WESTERN MONTANA...THE CENTRAL HIGH PLAINS...AND THE SOUTHERN HIGH PLAINS INTO SOUTHERN ARKANSAS AND NORTHERN LOUISIANA.... ...SUMMARY... Isolated to scattered storms may produce large hail from eastern New Mexico and western Texas into southern Arkansas and northern Louisiana on Friday. Strong to severe storms may also occur across western Montana with gusty winds and marginal hail. Damaging thunderstorm wind gusts are also possible across portions of the central High Plains. ...Synopsis... A closed low across the Great Basin will become an open wave and start to advance northeast toward the central Rockies. As this occurs, lee troughing will begin across the southern and central High Plains and into eastern Montana. A strong mid-level trough will move southward across eastern Canada into the Northeast. ...Western Montana... Weak to moderate instability will build across western Montana on Friday as dewpoints increase into the mid 50s and mid-level temperatures cool. Mid-level flow is forecast to increase to 30 to 40 knots across western Montana which will provide sufficient shear for storm organization. The Marginal Risk was expanded slightly to account for the likely extent of the threat given the 12Z guidance. ...Central Plains... Surface moisture is forecast to back up near the terrain across northern Colorado and southeast Wyoming. This will lead to weak to moderate instability across the region. In addition to typical terrain circulations, guidance suggests a weak mid-level shortwave trough may emerge across the region and provide additional support for storm development. Shear is forecast to remain relatively weak, but weak to moderate instability, and steep lapse rates will support some threat for severe wind gusts. ...Southern Plains into southern Arkansas and northern Louisiana... A southern stream mid-level jet streak is forecast to emerge from northern Mexico into the southern High Plains. This ~40 knot jet streak will overspread portions of the southern High Plains and the dryline. This should provide ample shear for storm organization during the afternoon/evening. Greater storm coverage and severe potential may exist between Midland and Lubbock at the nose of this stronger mid-level flow. However, there is still some uncertainty with the timing/location of this jet streak, so will not add higher probabilities at this time. Added 5% probabilities farther east across Oklahoma and into southern Arkansas and northern Louisiana. Moderate instability is expected south of a frontal zone in this general area. This may be a focus for storm development Friday afternoon/evening. Shear may be somewhat weak, but the instability and frontal focus could support a few strong to severe storms. ..Bentley.. 05/27/2026 $$ = = = 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]