The West's record-breaking heat wave, which has affected much of the western United States, continues to build and spread east into the central U.S. Temperatures that are 20 to 40 degrees Fahrenheit above average for this time of year are expected to be common from the Southwest into the Great Plains. Over 150 daily temperature records and around 50 monthly all-time records have already been broken, with more expected to fall this weekend and in the coming days. Parts of California were well above seasonal averages, with Death Valley reaching a new monthly record of 105 degrees. Meanwhile, Las Vegas hit 96 degrees on Saturday and is forecast to reach 93 degrees on Sunday. The National Weather Service has urged people to take proper precautions to avoid heat-related illness. An extreme heat warning remains in effect in the region until Sunday. Global warming is known to make heat waves more frequent, more intense and longer-lasting, according to a report from the World Weather Attribution group.