Exercising outside in high temps can be a health hazard. Here's how to read your local index, according to a doctor, so you can stay safe.

As Pittsburgh's temperatures climb toward triple digits, these are the key heat-related weather terms you should know.

The metric of how hot the air actually feels has roots in a 1979 journal paper called “The Assessment of Sultriness.” By Andy Newman In recent days, you may have seen or heard many mentions of a ...

The U.S. is looking at an unwelcome birthday gift: a dangerous heat wave arriving ahead of the holiday weekend. Limited time: ...

Temperatures are hitting the mid- to upper 90s in many places across the Northeast.

Track extreme heat alerts with this interactive map.