BBS: TELESC.NET.BR Assunto: DAY48SVR: Nws Storm Prediction Center Norman Ok De: COD Weather Processor Data: Sat, 18 Apr 2026 07:42:54 +0000 ----------------------------------------------------------- ACUS48 KWNS 180742 SWOD48 SPC AC 180740 Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0240 AM CDT Sat Apr 18 2026 Valid 211200Z - 261200Z ...DISCUSSION... Initially dry conditions will keep the severe weather threat low on D4/Tuesday. As a mid-level trough traverses the Rockies on Monday, lee troughing will strengthen on D5/Wednesday. This will bring substantial moisture return across the Plains. Given the early stage moisture return, more than an isolated severe weather threat appears unlikely on D5. A more substantial severe weather threat is anticipated on Day 6/Thursday. The evolution of the mid-level trough still remains unclear, but an overall pattern featuring broad troughing across the southern/central Plains, moderate to strong instability, and a sharp dryline, could support at least isolated supercells Thursday afternoon/evening. Have added a 15% area from western/central Oklahoma into southern/eastern Kansas where the severe weather threat seems likely regardless of how exactly the mid-level pattern evolves. The uncertainties discussed for Day 6 become greater on Day 7 and beyond. Persistent troughing across the Plains and considerable instability suggest that severe weather is likely on Friday (and likely into the weekend). However, the progression of the mid-level trough and the associated surface features need to become more clear before a 15% area can be defined for these days. ..Bentley.. 04/18/2026 = = = 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]