UNDATED (WSAU-Wheeler News) Much of Wisconsin will have its stickiest day of the summer.
Heat advisories will be in effect through this evening in parts of the northwest -- where some places could get their first 90-degree days of the year. The National Weather Service says the heat index could reach 100 in the Saint Croix River valley.
Lots of people will try to find swimming holes to cool off -- but that could be a problem on the east shore of Door County, where the Weather Service has issued a beach hazard statement for dangerous swimming conditions on the shores of Lake Michigan. Waves of 2-to-4-feet are possible along the Eastern Door through 9pm.
Things are expected to cool off tomorrow, after a low-pressure system brings thunderstorms to the northwest half of Wisconsin tonight. Highs tomorrow are expected to drop to the 70's-and-low-80's, but another round of storms is due in late tomorrow -- and the Weather Service says those storms could be severe.