NORTH SIOUX CITY, S.D. (AP) More storms are possible in parts of the deluged Midwest, where flooding after days of heavy rains has killed at least two people, sent a river surging around a dam and forced evacuations and rescues.

Severe storms were forecast for Tuesday afternoon and evening with large hail, damaging winds and even a brief tornado or two in parts of western Iowa and eastern Nebraska, according to the National Weather Service. Showers and storms are also possible in parts of South Dakota and Minnesota, the agency said.

Flooding in those states has also come during a vast and stubborn heat wave. Some communities hit by flooding were under an excessive heat warning Monday with temperatures approaching 100 degrees Fahrenheit (38 Celsius). Dangerous hot, muggy weather was expected again Tuesday around the Omaha area.

More than 3 million people live in areas touched by flooding, from Omaha, Nebraska, to St. Paul, Minnesota. Storms dumped huge amounts of rain from Thursday through Saturday, with as much as 18 inches (46 centimeters) falling south of Sioux Falls, South Dakota, according to the National Weather Service.

Places that didnt get as much rain had to contend with the extra water moving downstream. Many streams, especially with additional rainfall, may not crest until later this week as the floodwaters slowly drain down a web of rivers to the Missouri and Mississippi. The Missouri will crest at Omaha on Thursday, said Kevin Low, a weather service hydrologist.

On Saturday, an Illinois man died while trying to drive around a barricade in Spencer, Iowa, Sioux Citys KTIV-TV reported Monday. The Little Sioux River swept his truck away, the Clay County Sheriffs Office said. Officials recovered his body Monday.

At least one person died in South Dakota, Gov. Kristi Noem said without providing details.

Ive never had to evacuate my house, Hank Howley, a 71-year-old North Sioux City, South Dakota, resident said as she joined others on a levee of the swollen Big Sioux River, where a railroad bridge collapsed a day earlier. She did not have to evacuate in recent days either, but said: Were on the highest spot in town. But what good is that when the rest of the town is flooded? It makes me nervous.