 when it hits on Monday. A barrel expected to make landfall around the Texas-Mexico border. Mother Nature turning up the heat for millions of Americans as we look ahead to the weekend. Roughly 134 million people are under alerts for what the National Weather Service is calling an extremely dangerous and record-breaking heat wave. With parts of Florida, Ohio, the Southern Plains, and nearly all of the West Coast seeing surging temperatures, Phoenix, Arizona soaring above 115 degrees.