The heat wave that has spread from the Midwest to the Northeast continued hitting record-high temperatures on Saturday. The National Weather Service warned of “oppressive heat,” meaning temperatures above 90, in several states. In New York’s Central Park the temperature rose above 100 degrees, the highest ever. Newark, N.J., experienced temperatures of 102, the highest July 23 since 1955. In the New York metropolitan area, 22,000 customers were without power on Saturday. Chicago cooled off a bit, but the heat was replaced by rain, as the city experienced its wettest calendar day ever, with 6.86 inches of rainfall.