Hot and Humid Friday for Wisconsin

A Hot and Humid Day Observed

Across Southern Wisconsin Friday

A low pressure system passing to the northwest during the day produced southerly to southwesterly flow over the state. This southerly flow ushered in very warm and moist air, leading to heat indices above 100 degrees over portions of south central Wisconsin. Morning cloud cover and ouflow from the convection over the lake helped keep the Lake Michigan lakeshore counties in a more bearable state, with temperatures only reaching into the upper 80s and heat indices around 90 degrees. It was the combination of temperatures in the 90s and dew point temperatures reaching into the 70s that produced the hot heat indices in the counties away from the lake, especially in portions of south central Wisconsin. Listed below are some of the sites in southern Wisconsin that reached a heat index of at least 100 degrees.

City County Temperature Heat Index TIme of Occurrence
Lone Rock Sauk 96 107 3/4 PM
Monroe Green 92 107 4 PM
Portage Columbia 94 106 3 PM
Westfield Marquette 93 105 4 PM
Madison Dane 91 104 5 PM
Middleton Dane 93 104 5 PM
Darlington Lafayette 90 102 5 PM
Baraboo Sauk 93 102 4 PM
Mineral Point Iowa 93 102 4 PM
Watertown Jefferson 91 102 3 PM
Fond du Lac Fond du Lac 91 101 5 PM
Milton Rock 92 99 3 PM

A cold front is expected to pass through the area by Saturday morning, bringing a slight relief to the hot and humid conditions. Winds will turn more westerly in the wake of the front on Saturday, leading to temperatures reaching the mid to upper 80s. However dew point temperatures should remain in the upper 60s to lower 70s, thus allowing for a less humid day than today. Temperatures are forecasted to drop back to the lower 80s by Sunday.

Click here to use the heat index calculator. 

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