As a heat wave hits multiple U.S. states, some areas are have been placed under extreme heat watches and warnings.

The National Weather Service issued an extreme heat warning for a second day as the heat index surpasses 100. See how hot it ...

Most of Long Island is under an extreme heat warning Tuesday as temperatures are expected to reach dangerous heat index ...

Tuesday could bring a higher heat index, with real-feel temperatures up to 111 degrees. Here's when the region could see ...

An extreme heat warning was issued by the National Weather Service in Mount Holly at 11:03 a.m. on Monday, June 23.

An Extreme Heat Warning is in effect for most of Southern New England except the Berkshires. Heat impacts are expected Sunday ...

The NWS has issued an extreme heat warning for central North Carolina, with heat index values possibly reaching 112 degrees, ...

The National Weather Service has issued an extreme heat warning for most of Southern New England with the temperature ...

A strong upper-level ridge parked over the eastern half of the country will continue to generate an extremely dangerous heat ...

CHICAGO (WLS) -- The Chicago area will be undergoing another day of extreme heat Monday. A National Weather Service Extreme ...

The thermometer at Boston Logan International Airport showed 100 degrees as of 2 p.m. Tuesday, according to the National ...

The National Weather Service has issued an extreme heat warning for the second consecutive day, with the temperature expected ...