More than 70 million people in US are under heat alerts

PHOENIX - More than 70 million people in the United States were under extreme heat alerts Monday as a heat wave moved eastward, and the mid-Atlantic and New England were likely to see highs in the 90s as the week progresses. Excessive humidity will make it feel even more oppressive.

The U.S. last year saw the most heat waves, consisting of abnormally hot weather lasting more than two days, since 1936. Officials a