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

A brutal heat wave across the eastern United States trapped millions of people in sweltering air this week with record-high ...

Maps show where extreme humidity and 90- or 100-degree temperatures will affect about 255 million people across the United ...

A heat wave is currently affecting about 160 million people, according to the National Weather Service. Here's which states ...

Several states are expecting extreme heat, with the heat index, or feels-like temperature, surging past 100 degrees.

In Caribou, Maine, the National Weather Service issued its first-ever excessive heat warning for a heat index nearing 110F on June 19. Las Vegas also grappled with extreme heat, reaching ...

Extreme weather 101: Your guide to staying prepared and informed How to pack a go-bag, ... If you’re in a rural area or somewhere that isn’t highlighted on its maps, ...

Planetary waves are connected to 2021’s deadly and unprecedented Pacific Northwest heat wave and wildfires, the 2010 Russian heatwave and Pakistan flooding and the 2003 killer European heatwave.

Unless society stops pumping more greenhouse gases in the air, “we can expect multiple factors to worsen summer extremes,” a ...