Millions on alert as heat dome intensifies in the East

Roughly 160 million Americans are in the grip of a life-threatening heat wave impacting almost the entire eastern half of the country. READ more from ABC News: Dangerous temps to continue into July 4 holiday: https://tinyurl.com/2247xbmx SUBSCRIBE to GMA:    / @gma   SIGN UP to get the daily GMA Wake-Up Newsletter: https://tinyurl.com/yc34mz6t To read the full story and others, visit http://www.goodmorningamerica.com FOLLOW: TikTok:   / gma   Instagram:   / goodmorningamerica   Facebook:   / goodmorningamerica   Threads: https://www.threads.net/@goodmorninga... X:   / gma   Watch full episodes of GMA: https://abcnews.link/8SAXtIX Watch full episodes of GMA3: https://abcnews.link/8aZfnmd Watch full episodes of GMA First Look: https://abcnews.link/LxV2S7H