Weather woes forecast to continue as flooding in the Midwest turns deadly and extreme heat heads south [Video]

Millions of Americans sweated through a scorching weekend as temperatures soared across the U.S., while residents were rescued from floodwaters that forced evacuations across the Midwest. One person was killed during flooding in South Dakota, the governor said.

The National Weather Service said the worst of the heat wave would shift from the mid-Atlantic to portions of the southeast and southern Plains by Monday, brining welcome relief for major cities from Washington D.C. to Boston — but it may be short-lived.

Plenty of Americans were still sweating it out Monday, with more than 60 million people under heat advisories in 21 states. High temperatures were expected from South Dakota to Florida, and the heat is expected to start climbing again in the mid-Atlantic as the week goes on, even rising back toward triple digits by Wednesday.    

Parts of the Midwest already inundated by floodwater, meanwhile, could see more significant rainfall in the days ahead.

Here is what we know:

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