About 200 million people are under some sort of heat alert Monday, including 24 million under the highest alert — extreme heat warning — for scorching conditions.

Severe thunderstorms could continue into July 29, bringing havoc to morning commutes in Chicago, Milwaukee and Indianapolis.

Besides the extreme heat, parts of the Midwest, including South Dakota and western Minnesota, are expecting potentially destructive winds of more than 75 mph on Monday evening. A few severe storms are also expected to roll through North Dakota on Monday evening and spread into Minnesota and Iowa on Monday night.

About half the country is under active heat advisories on Monday, affecting more than 198 million Americans, according to the National Weather Service . The extreme heat is expected in the Midwest, the Southeast and some parts of the Northeast. The heat alerts will remain in effect through Wednesday night in some places.

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On Monday at 2:25 p.m. an updated heat advisory was released by the National Weather Service in effect until Wednesday at 8 p.m. for Western Montgomery, Eastern Montgomery, Upper Bucks and Lower Bucks as well as Delaware and Philadelphia counties.

On Monday at 5:57 p.m. EDT an updated heat advisory was released by the National Weather Service in effect until 10 p.m. EDT for Midland, Bay, Huron, Saginaw, Tuscola, Sanilac, Shiawassee, Genesee and Lapeer counties.

Most of Massachusetts is under a heat advisory through Wednesday, and forecasters are urging residents to look out for the high temperatures.

The Treasure Coast is under a heat advisory with the 'feels like' temperature expected to reach 110 degrees, according to the National Weather Service.