The heat index could get as high as 120 degrees in some states. ABC News Chief Meteorologist Ginger Zee breaks it all down. WATCH the ABC News Livestream: bit.ly/3rzBHum SUBSCRIBE to ABC News: bit.ly/2vZb6yP WATCH MORE on abcnews.go.com LIKE ABC News on FACEBOOK: facebook.com/abcnews FOLLOW ABC News on TWITTER: twitter.com/abc #news #heatwave #heatindex #abcnews