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.

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

The heat wave is coming, Delaware! Here's the latest forecast, from when the 'dangerous' heat is heading in to how hot it'll feel.

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

More than half the country, including Illinois, is currently in a heat dome. Here's what that means and how to stay safe during excessive heat.

Recent cool days may make it hard to believe, but a heat wave is coming to NJ soon. Here's the latest temps, heat index. How hot will it get?

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.

Blazing temperatures scorched several states on Tuesday, as about 80,000 residents faced power outages.

Many states will experience temperatures that feel in the triple digits on Thursday, forecasters say.