Potentially record-setting heat wave scorches western United States

Across the West tonight, a scorching March heat wave making winter feel more like the height of summer. From California to New Mexico, 38 million people under heat alerts. Cities like Tucson and Phoenix bracing for tripledigit temps.Neither have ever before seen a 100 degree day in winter. >> Those are June. Those are July temperatures.The Phoenix Fire Department says already this week they've had to make at least two heat related rescues on their hiking trails, which the city is now closing during the day ...