If you’re planning any outdoor activities this Fourth of July, be sure to hydrate regularly, wear sunscreen and watch for signs of heat stress, because it’s going to be a hot one.

A large portion of the United States — 110 million people across 21 states — will experience heat-related advisories and warnings in the West, southern Plains and Mid-Atlantic this Independence Day, reported Reuters.

“It’s really hot; I don’t know how else to put it,” said Jacob Asherman, a National Weather Service (NWS) meteorologist, as Reuters reported. “We’re having excessively hot weather across a lot of the country.”

According to the NWS, the next several days are predicted to bring an extensive heat wave with temperatures well above 100 degrees Fahrenheit in some areas.

“[W]ell above average temperatures over California and into southwest Oregon today before heat spreads further throughout the western […]