Millions in US brace for more heat as floods inundate parts of Midwest

Millions of Americans prepared to sweat through yet another scorching day, with the potential for rolling storms later Sunday to bring relief from the sweltering heat for at least some. Floodwaters inundated parts of the Midwest, including a town in Iowa evacuated after being submerged up to the rooftops.

Across the country in California, daily highs in the state's Central Valley were expected to stay in the triple digits (over 37 Celsius) into Monday.

From the mid-Atlantic to Maine, across much of the Midwest and throughout inland California, public officials cautioned residents sweating through the heat and humidity. In Oklahoma, the heat index what the temperature feels like to the human body was expected to reach 107 degrees (41 degrees Celsius) on Sunday.

It's more important for people who are going to be outside to stay hydrated, because heat, humidity and low winds, even if you're in good shape and not really acclimated to it, it could be a danger, said Bruce Thoren, a ...