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Severe Thunderstorm Watch Number 532 NWS Storm Prediction Center Norman OK 245 PM CDT Sat Jul 20 2019 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northern Illinois Lake Michigan * Effective this Saturday afternoon and evening from 245 PM until 900 PM CDT. * Including the following counties ...Winnebago, Boone, Cook, DeKalb, DuPage, Kane, Lake, McHenry, Lee and Ogle * Primary threats include... Isolated damaging wind gusts to 70 mph possible A tornado or two possible SUMMARY...Bands of strong-to-severe thunderstorms across far southern Wisconsin may develop east-southeastward into northern Illinois near a southward-sagging outflow boundary. The air mass across northern Illinois is very hot and unstable. Thus, any storm development into/across northern Illinois could pose a damaging wind risk through the afternoon/early evening. The severe thunderstorm watch area is approximately along and 25 statute miles north and south of a line from 65 miles west of Rockford IL to 100 miles east of Rockford IL.