The areas affected include...
Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid Lake...
At 156 PM CDT, Doppler radar indicated strong thunderstorms, capable of producing winds to around 30 knots. These thunderstorms were located along a line extending from 24 nm northwest of St. Joseph Light to 20 nm northeast of Harrison-Dever Crib, moving east at 20 knots.