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

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.

On Tuesday, the heat turns up even more with high temperatures across the region likely in the mid-upper 90s. The forecast for Tuesday and Wednesday in Philadelphia is for a high of 98 degrees, which would tie the record for both days.

The National Weather Service has issued a heat advisory for Rhode Island and other parts of Southern New England.

By Thursday, July 31, it will be cooler as a cold front moves in, keeping temperatures in the mid-80s. The NWS is also forecasting scattered showers and the potential for flash flooding again, as up to 2 inches of rain could fall within the span of an hour.

Blazing heat and humidity will send temperatures soaring into the mid to upper 90s. Feels like temperatures at 100°+

Heat stroke differs from heat exhaustion in two major ways, Smurawa said. Heat stroke involves a dangerously high core body temperature — typically 104 F or more — and can impair the central nervous system. This means a person may become disoriented, confused or, in severe cases, experience seizures or even coma.