Get ready for more humid and stormy weather, Wisconsin.
Starting Sunday afternoon, July 27, heat indexes will ramp up, reaching the mid-90s across southeast, southern, northeast and central Wisconsin. The heat index combines air temperature and relative humidity to measure what the heat feels like to the human body.
Monday, July 28, will be even warmer, with feels-like temperatures hitting 100 degrees or higher in parts of southern Wisconsin.
It will be slightly cooler along Lake Michigan, though Milwaukee could still see a heat index of at least 97 degrees on Monday, July 28.
The National Weather Service is leaning toward issuing a heat advisory for July 28, according to meteorologist Cameron Miller.
That depends on whether a cluster of thunderstorms moves south into Wisconsin overnight, or whether it falls apart before reaching the state. If it stays together, rain and cloud cover could provide some relief from the heat.
"There's a lot of questions around that," Miller said. "There is that major caveat with the storms."
What's causing the heat? A warm front is parked just south of the state that's shifting north. But you can also blame the "corn sweat" in the band from Iowa to Indiana, he said.
More: 'Corn sweat' is contributing to Wisconsin's extreme heat this week. What is it?
More: Where to find cooling centers, splash pads in Milwaukee during extreme heat
Thunderstorms possible through Wednesday, July 30, in Wisconsin
Aside from the heat, there's a chance for rain and thunderstorms essentially every night this week through Wednesday morning, July 30.
The timing of those storms and where they'll land remain uncertain. None are expected to be severe.
"Each successive round of thunderstorms is going to affect where that front ends up," Miller said.
The rest of the week will dry out and cool down gradually. Tuesday, July 29, will reach a high of 84 degrees. Wednesday afternoon, July 30, through Friday, Aug. 1, should be sunny, with pleasant highs near 75.
"Relief is on the way," Miller said.
This article originally appeared on Milwaukee Journal Sentinel: More 100-degree heat indexes, storms in Wisconsin early this week
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