At least 100 million Americans are on alert for dangerous heat and ... In Boston, the heat index -- how hot it feels with ...

Sauna-like conditions on Friday are threatening to break records in major Northeast cities during summer’s hottest month after dangerous heat peaked Thursday in the central United States.

What are heat streaks? The extreme weather phenomenon on the rise - Feel like the heat never ends? That’s because heat streaks, or the number of consecutive hot days, are also on the rise across U.S.

Be sure to download the KOAT App to receive customized weather alerts. You can watch the latest forecast on the app, too.

A sunny, hot, and humid weekend is ahead for Jacksonville, with heat index values soaring in triple digits. When will ...