Stories

Dangerous heat wave won't let up across U.S.

Eduardo Velev cools off in the spray of a fire hydrant during a heatwave on July 1, 2018 in Philadelphia.
Eduardo Velev cools off in the spray of a fire hydrant during a heatwave on July 1, 2018 in Philadelphia, Pennsylvania. Credit: Jessica Kourkounis/Getty Images

Extreme heat and humidity will continue through the end of the holiday week across the eastern U.S., before it shifts westward, roasting the Midwest and Great Plains, potentially setting records and intensifying ongoing wildfires all the way to California.

Why it matters: Heat is the top weather killer in the U.S. during most years. According to the Centers for Disease Control and Prevention, more than 600 people are killed every year due to heat-related illnesses in the U.S.