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Milwaukee's 10-day forecast calls for extreme heat, humidity – Milwaukee Journal Sentinel

Historic heat waves in the Southwest are heading toward Wisconsin in what will surely bring the hottest week of the year so far. According to experts, highs are expected to hover in the mid-90s, and dew points are expected to spike, resulting in a “hot and muggy” wave of weather.
With the heat quickly approaching here’s what you need to know about how hot it will be, how humidity will come into play, how long this heat wave will last and how to prepare and react when it arrives.
Marcia Cronce, a National Weather Service Meteorologist, said that the heat wave’s current path means that western Wisconsin will bear the brunt of this system, but that doesn’t mean the rest of the state is off the hook.
“The high-pressure ridge that’s over the Southwest is going to inch eastward and that will nudge those hot temperatures into Wisconsin,” said Cronce, “We’re also going to have some southerly winds throughout the week and that will ensure that the heat is brought into our area.”
While temperatures won’t reach the scalding highs seen in the southwest, most of the state will be at or around 90 degrees by Tuesday and temperatures are only expected to rise throughout the week. 
Cronce said Wednesday and Thursday are expected to be the hottest days with temperatures in west Wisconsin potentially reaching the upper 90s.
Breezes from Lake Michigan will mean that Milwaukee and other places near the lake will see slightly lower temperatures — though highs are still expected to creep into the mid-90s on Wednesday and Thursday.
Friday in the Milwaukee area could still see highs in the 90s but as the weekend goes on the weather service predicts that temperatures will drop into the low 80s where they have been for most of the summer.
Cronce said that a “comfortable” dew point, a measurement that indicates humidity, is around 50. As temperatures start to rise this week that number could get as high as 70, potentially causing an excessive heat warning to be issued.
“We issue excessive heat warnings any time it is above a 100-degree heat index value, and right now Thursday is the most likely day that we would have to do that,” said Cronce.
Spikes in dew points are a common occurrence in Wisconsin, but Cronce warned that the higher values expected on Wednesday and Thursday will make it noticeably hotter.
Ahead of this week’s temperature spikes, the weather service has advised Wisconsinites to check on family members, especially elderly individuals, to make sure they have running air conditioning.
Other recommendations include: limiting time outdoors, avoiding exposure to the sun, staying hydrated, protecting pets and under no circumstances leaving babies or pets in a car — even if the windows are cracked.
Heat and humidity are food for storm systems and Cronce said that an influx of both this week could spur much-needed rain across Wisconsin.
“It’s very difficult to time when these storms are going to occur,” said Cronce. “It’s just like the kind of storms that develop small but then feed off each other and develop into something bigger and that can happen anywhere in the Midwest.”
After historically low rain numbers this spring and summer, Wisconsin has seen more rain in recent weeks, but the state is still comfortably behind where it would usually be this time of year.

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