Metro Detroit weather: Heat Advisory with heat index to hit, exceed 100 degrees Thursday

It's a stormy and hot start to Thursday across Southeast Michigan with pouring rain. 

A Heat Advisory is in effect for Washtenaw, Wayne, Lenawee, and Monroe counties from 8 a.m. until 8 p.m.

Check out some 3-hour rainfall totals:

That's a tremendous amount of rain that has prompted a Flood Warning that covers Oakland, Wayne, Macomb, Livingston, and Monroe counties until 3:45 p.m.

We'll catch a break from the storms by midday as the heat builds. Our heat index will peak near and above 100° in spots. 

Areas south of Detroit are more likely to experience heat indices greater than 100. 

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Detroit cooling centers open for residents to escape the heat

Temperatures are expected to get over 90 degrees Friday and will stay hot the entire weekend.

The actual temperature readout will be closer to the low 90s by midday Thursday. It'll feel hottest during the afternoon and early evening.

Storms will return late this afternoon or this evening. 

Severe weather is again a distinct possibility with the late storms. Damaging wind and flooding rains are the greatest threats.