As record high average temps keep rolling month to month, many states in the southwestern United States are bracing for a Heat wave this weekend.  The record-setting heat is headed for Southern California, Arizona, parts of Nevada and other areas of the Southwest. temperatures are expected to hover around 120 degrees with some areas exceeding the mark. National Weather Service warned the heat is 'rare, dangerous and deadly,' heat exhaustion and heat stroke can result if caution is not applied.