 Paul Boger of Nevada Public Radio has more. According to the National Weather Service, excessive heat warnings, watches, and heat advisories are currently in effect for nearly all of Washington State, Oregon, California, Idaho, Nevada, and southwestern Arizona. In Las Vegas, temperatures climbed to 120 degrees over the weekend, shattering the previously held record high of 118. To help those who can't escape the heat, officials in southern Nevada have opened cooling centers...