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 ...

According the the National Hurricane Center, Tropical Storm Flossie could strengthen into a hurricane as early as Monday.

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.

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

A massive heat dome – a stationary high‑pressure system trapping soaring heat and humidity – has parked over DC. This "lid" on the atmosphere allows relentless sunshine to bake the region day after ...

A new study says climate change has tripled the frequency of atmospheric wave events linked to extreme summer weather in the ...

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