(AP) – More than 70 million people in the United States are under extreme heat alerts as a heat wave moves eastward. The mid-Atlantic and New England are 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 again are warning residents to take precautions. Much of the Midwest and Northeast are under heat warnings or watches. While much of the U.S. swelters, late-season snow was forecast for the northern Rockies.