SPC AC 111226 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0726 AM CDT Tue Aug 11 2026 Valid 111300Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS NORTHERN ILLINOIS INTO THE OHIO VALLEY... Areas of severe wind gusts and hail will also be possible over parts of the northern Plains. Considered higher wind probabilities to be delineated this outlook update, but it remains unclear regarding sequential details that would lead to a high-confidence mesoscale corridor of severe wind and associated wind damage. Scattered severe gusts (60-85 mph) will be likely in the favored mesoscale corridors with swaths of concentrated wind damage. Isolated severe gusts are possible with the more intense downdrafts.