GENESEE COUNTY, Mich. A Thunderstorm warning has been issued for Genesee County until 11 a.m. Sunday. The National Weather Service also issued a heat advisory for Oakland, Macomb and Wayne counties that will be in effect until 7 p.m. Sunday. Outside of Metro Detroit the same heat advisory is in effect for Lenawee, Livingston, Monroe, St. Clair and Washtenaw counties. Sunday afternoon will be hot and sweltering in Metro Detroit. SUNDAY FORECAST: Hot and humid with showers and storms SundayFor an in-depth, interactive live weather radar map, go here: Michigan Weather Radar.