The mass of hot, humid air that produced oppressive weather earlier this week in New England, the Midwest and the Rockies was flowing into Southern California on Thursday, where it will generate the first major heat wave of summer in one of the driest regions of the country. The heat wave will peak on Friday when temperatures reach117 in Ocotillo Wells, 114 in Anza Borrego State Park, 113 in Valley Center, 111 in Santee and Ramona, 109 in Campo, 105 in Escondido, 99 in Julian and 87 on Coronado, according to the National Weather Service.