Denver recorded 99 degrees Monday, breaking a record high for that date, and expected more of the same Tuesday while northern Texas, Kansas and Oklahoma's forecasts include 100-degree daytime temps, CNN reported.
Dangerous rip currents killed at least four people since Sunday on the Alabama Gulf Coast and prompted Florida officials to close a popular beach, CNN said.
Dawn Wood told WPMI-TV, Pensacola, Fla., she saw one man drown after being sucked away from the beach.
Despite warnings to beach-goers to take care, the sheriff's office in Bay County, Fla., said the county handled numerous water-related calls Monday, eventually prompting to authorities to post double red flag warnings on Panama City Beach, closing it to swimmers.
Meanwhile, thunderstorms spawned tornadoes in Kentucky and Maryland, destroying buildings.
Weather officials said at least two tornadoes touched down in the Baltimore area.
Heavy rains flooded streets in Baltimore Monday and more of the same was expected Tuesday, forecasters said. Flood warnings extend from Washington to Philadelphia and New Jersey.
In southern Kentucky, Steve Adair tried to beat out could have been a tornado WTVF-TV in Nashville said.
"You just see a bunch of debris in the air and wind started blowing hard," he said outside his destroyed home. "It's just amazing to me how a little bit of wind can do all of this."