Important Takeaways:

• … 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.
• At the borders of South Dakota, Iowa, and Minnesota, floodwaters rose over several days.
• In South Dakota, Gov. Kristi Noem declared an emergency after severe flooding in the southeastern part. Several highways were closed. Areas south of Sioux Falls, the state’s largest city, had an estimated 10 to 15 inches of rain over three days, National Weather Service hydrologist Kevin Low said.
• At least one person died in the floods, Noem said Sunday, without providing details.
• In northwest Iowa, 13 rivers flooded the area, said Eric Tigges of Clay County emergency management. Entire neighborhoods — and at least one entire town — were evacuated, and the Iowa town of Spencer imposed a curfew Sunday for the second night in a row after flooding that surpassed the record set in 1953.
• “When the flood gauge is underwater, it’s really high,” Tigges said at a news conference organized by Spencer officials.
• National Weather Service meteorologist Donna Dubberke said parts of northern Nebraska, southeastern South Dakota, southern Minnesota and northwest Iowa received eight times the typical average rainfall. And more heavy rain is expected in the week ahead

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