Record-breaking heat is expected on Tuesday, with multiple regions seeing temperatures in the triple-digits, posing a potential health threat to millions. LEARN MORE: Hot car dangers: How to keep your kids safe this summer: https://abcn.ws/334nMAM SUBSCRIBE to GMA's YouTube page: https://bit.ly/2Zq0dU5 SIGN UP to get the daily GMA Wake-Up Newsletter: https://gma.abc/2Vzcd5j VISIT GMA's homepage: https://www.goodmorningamerica.com FOLLOW GMA: TikTok: https://tiktok.com/@gma Instagram: https://instagram.com/GoodMorningAmerica Facebook: https://facebook.com/GoodMorningAmerica Twitter: https://twitter.com/gma #GMA #Heatwaves #Weather #Summer