Scorching heat or damaging winds have struck the nation, killing at least one and canceling hundreds of flights.
Storms in Michigan killed a 38-year-old father of six, who after putting his family out of harm's way was killed when a tree fell on him.
In Chicago, high winds flipped over planes destroyed an airport hangar and toppled trees. Power was knocked out to more than half a million people on a very hot day and cancelled more than 200 flights at O'Hare.
In North Dakota, tornado sirens wailed as severe weather raced through the state. In Iowa, storms tore into buildings, trees and powerlines, leaving a huge mess.
"We literally lost hundreds and hundreds of trees," said John Watson, mayor of Vinton. "We've got trees on top of houses, a lot of electrical interconnects are ripped off poles. And it will be days fixing all that."
The temperature reached a record-breaking 111 in Witchita, Kan., and in Witchita Falls, Texas, it's been above 100 virtually since the beginning of June.
Parts of 18 states have heat advisories warning that the heat is unhealthy. And the heat wave is rolling east. The high temperatures are being blamed for the death of a 51-year-old man found dead inside a mobile home in Illinois that didn't have air conditioning.
In Milwaukee, runners in a half marathon were so dehydrated that they couldn't cross the finish line.