It's easy to lose your appetite when it's too hot out. But eating the right foods will help you beat the heat.

Millions of Americans are under heat alerts Monday as a heat wave brings triple-digit temperatures or heat indices to nearly half the continental United States, according to the National Weather Service—with the heat expected to impact the parts of the Southeast and the Mississippi river the hardest.

Washington area residents are going to experience a sweltering first half of the week, as an extreme heat alert is in effect until Thursday morning. Feels-like temperatures will exceed 100 degrees during the daytime on Monday through Wednesday.

Heat safety is about more than just the temperature. When the heat index is high, it means that our bodies also struggle to keep us cooled off.

Forecasters warn of 100- to 105-degree heat index values through Tuesday, with potential storms offering limited relief.

More than 250 million people in the U.S.—nearly three quarters of the population—are experiencing moderate, major or extreme risk of heat effects on July 28, according to the National Oceanic and Atmospheric Administration’s National Weather Service.

Extreme heat may make people sick in North Carolina. Here's how to avoid heat illness when it feels like 105-110 degrees Fahrenheit outdoors.

A heat advisory will be in effect for all of north Alabama until 9 p.m. Tuesday. The National Weather Service in Huntsville said the heat index could go as high as 109 across north Alabama both this afternoon and Tuesday.

Tampa, Fla., recorded 100 degrees for the first time this weekend as extreme heat settles across much of the region.

An extreme heat warning and an extreme heat watch were issued by the National Weather Service in Jacksonville for July 28 and 29.