Forecast: Scattered showers, thunderstorms develop by afternoon of Fourth of July

A Severe Thunderstorm Warning is in effect for DeKalb and McHenry counties until 8:45 p.m., with a Severe Thunderstorm Watch for the Chicago area until 2 a.m. on Fourth of July. The day will have mostly cloudy, warm, and muggy conditions with scattered showers and thunderstorms, with the heaviest rain expected later.