SPC AC 110500 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1200 AM CDT Tue Aug 11 2026 Valid 111200Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM NORTHERN ILLINOIS INTO THE OHIO VALLEY... Areas of severe wind gusts and hail will also be possible over parts of the northern Plains. ...IA to the Mid-Atlantic... A complex forecast scenario is expected today from IA into the Ohio Valley and adjacent Appalachia. Possible early day convection across IN/OH will spread east/southeast across the Ohio Valley during the morning posing risk for strong gusts. Isolated severe gusts also could occur.