A line of severe thunderstorms is working out of southern Wisconsin this evening, and likely to move into Boone and McHenry Counties on its way to Chicago. Storms building in behind this line will arrive later in the evening, but may still bring severe weather threats.
Damaging wind gusts over 60 mph and large hail are the main severe threats this evening. In addition, the very humid air may produce flash flooding. 2" to 3" of rain may fall quickly in these very moist conditions. The city of Madison, WI is experiencing flash flooding, showing the capabilities of these storms. Do not drive into any flooded roads, and stay indoors and away from windows as these storms move through!
A Severe Thunderstorm Watch is in place until midnight for all areas of the Stateline because of the threat for severe weather. Stay with the 13 Weather Authority for updates throughout the evening. You can also track the storms on our website with our Interactive Radar.
This won't affect the heat much for tomorrow. An Excessive Heat Warning will still remain in effect until Friday evening for dangerous heat in the 100's with the heat index. Take it easy tonight and tomorrow in the hot weather, and drink plenty of water.