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74% of US has longer, more intense heat waves than 50 years ago

03:49

Extreme heat continues to plague Texas and much of the U.S. as the heat index is in the triple digits. NBC’s Kristen Dahlgren reports for TODAY on how 74% of the U.S. is experiencing longer and more intense heat waves compared to 50 years ago and Al Roker has the latest forecast. 

Heat kills more in U.S. each year than any other extreme weather event