After days of heavy rain and rapid snow melt, Yellowstone National Park may be closed for the season and neighboring towns have been forced to evacuate as helicopters have rescued dozens. WATCH FULL EPISODES OF WORLD NEWS TONIGHT: https://abc.com/shows/world-news-tonight WATCH WORLD NEWS TONIGHT ON HULU: https://bit.ly/3iQLwPp #WorldNewsTonight #flooding #yellowstonenationalpark