The NWS forecasts that ground-level ozone and particulate concentrations will reach dangerous levels and even normally healthy people should exercise caution.

A severe thunderstorm warning was issued by the National Weather Service in Milwaukee-Sullivan at 5:53 a.m. on Tuesday, Aug. 12.

A severe thunderstorm warning impacts portions of Dodge, Ozaukee, Milwaukee, Waukesha and Washington counties until 6:45 a.m.