Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

Difference between extreme heat watch and extreme heat warning Areas where dangerous heat is possible are placed under an extreme heat warning and are asked to prepare in case it happens.

What is clear, however, is that extreme heat is more than just an immediate health hazard – it may be silently accelerating the aging process, with long-term consequences for public health.

Toronto residents should brace for a stretch of very hot weather early next week.A "multi-day heat event" is in store for Toronto from Sunday to Wednesday with temperatures expected to exceed 30 C, ...

An extreme heat warning has been issued by the National Weather Service for Franklin, Worcester, Middlesex, Essex, Hampshire, Hampden, Norfolk, Suffolk, Bristol, and Plymouth counties through 8 p ...

Central Pennsylvania is experiencing a dangerous and record-breaking heat wave through Wednesday, with temperatures expected to reach near or above 100 degrees and heat indices creating ...

An Extreme Heat Watch is now in effect for Sunday, Monday and Tuesday with temperatures expected to approach 112 to 115 degrees in the Valley. As temperatures get dangerously hot and the risk for ...

Extreme heat warnings are in effect for the Lehigh Valley. How hot will it get and how long will the heat last?

Now that summer is here, dangerous heat and humidity will be more common over the next couple months. If you're experiencing extreme heat, it's important to recognize the signs of heat illnesses ...