Weeks of heat above 100F will be the norm in much of US by 2053, study finds

As many as 100 million Americans will be living in extreme' zones that will see heat index exceed 125F, according to new study

Vast swaths of the continental US will be experiencing prolonged and dangerous heatwaves by the middle of the century, with the heat index in some areas above 100F (38C) for weeks on end, according to an alarming new study published on Monday.

Almost two-thirds of Americans, who live in mostly southern and central states, will be at risk from the critical temperature increases, according to a Washington Post analysis of data from the non-profit First Street Foundation, which used current trends to predict the number of extreme heat days 30 years into the future.