Mercury Soars In Western US States A blazing heatwave has gripped the western states of America, where the mercury has risen to near-record highs in Las Vegas, Arizona, Nevada and California. Temperatures in sunbaked Las Vegas are expected to eclipse the record high of 47.2C this weekend. Phoenix is also expected to hit that mark. Large swaths of California have sweltered under extreme heat warnings, which are expected to last into Tuesday night. Forecasts have called for Death Valley to reach 53C as part of the heatwave that has caused large parts of the US to suffer. A tourist protects herself from the sun on the Hollywood Walk of Fame Death Valley's record high of 56C, set a century ago, stands as the highest temperature ever recorded on Earth. The heat was too much for some festival-goers at the 19th Annual Vans Warped Tour event in Las Vegas. Authorities say 200 people were treated for heat-related problems as temperatures soared at the outdoor concert. Lisa Hunter flew into Las Vegas for the festival from her home in Scotland. She was overcome by the scorching heat just two hours after she arrived. Lisa Hunter, of Scotland, was overcome by the heat in Las Vegas "I just felt faint, I couldn't see, I couldn't hear and next thing I know I'm here," Ms Hunter told CBS News from the festival's first aid tent. In California, National Weather Service meteorologists John Dumas said cooling ocean breezes have not been travelling far enough inland to fan Southern California's overheated valleys and deserts. Cooling stations have been set up to shelter the homeless and elderly people who can not afford to run their air conditioners. At least seven people have been found dead in the last week in Arizona after falling victim to the brutal desert heat. It is responsible for weather systems getting stuck, like the current heatwave.