SPC AC 091959 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0259 PM CDT Sun Aug 09 2026 Valid 092000Z - 101200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF THE MIDWEST INTO THE OHIO VALLEY... ...SUMMARY... Scattered damaging winds are possible today into this evening from southern Wisconsin eastward across parts of northern Illinois, southern Lower Michigan, northwest Ohio, and northern Indiana. The main changes made to the outlook were to remove the Slight Risk and more broadly expand Marginal Risk severe probabilities across the central/northern Plains. ...Dakotas... 12z model guidance continues to decrease the confidence in overnight severe storms, with some CAM solutions showing no thunderstorms. The strength of the steering flow, instability, and mid-level moisture all appear favorable for a severe risk.