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

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

"Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors," an extreme heat warning issued by the Mount Holly, New Jersey, NWS office said.

"Dangerous heat will intensify across much of the Northeast and Mid-Atlantic early this week," meteorologist Jacob Hinson said.

Stay safe in this sweltering heat, New Jersey. Here's the latest today, from heat maps, advisories and warnings, to when we'll see relief.

A heat wave is blanketing Delaware today and will last several days. When is relief on the way? Here's the latest forecast.

A heat dome is about to bring extreme heat and humidity to more than 200 million Maps show where extreme humidity and 90- or 100-degree temperatures will affect around 255 million people across ...

Soaring temperatures this week has cut power for thousands around Ohio. These maps can tell you how widespread an outage is and when power will return.

Much of New York is currently under a state of emergency because of a blistering heat wave. We are about to break a 125-year record. State and local authorities have clear recommendations for stayi… ...