Blistering heatwave scorching much of the U.S.

Over 170 million people were left sweltering by a nationwide heat wave, sparking fears of power outages, transit delays, and health hazards. #million #sweltering #nationwide #heatwave #sparking #fears #power #outages #transit #health #hazards #ABCNews #WorldNewsTonight WATCH THE FULL EPISODE OF 'WORLD NEWS TONIGHT': https://bit.ly/2MrPN0Z WATCH OTHER FULL EPISODES OF WORLD NEWS TONIGHT: http://abc.go.com/shows/world-news-tonight SUBSCRIBE to ABC NEWS: https://www.youtube.com/ABCNews/ Watch More on http://abcnews.go.com/ LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews FOLLOW ABC News on TWITTER: https://twitter.com/abc GOOD MORNING AMERICA'S HOMEPAGE: https://www.goodmorningamerica.com/