Temperatures to climb to extreme levels even for hottest part of USMore than 50 million Americans in the southwestern U.S. are under heat advisories or warnings as temperatures will take a run at records that have stood for nearly 50 years in some locations. Temperatures will climb to levels unusual even for the notoriously hot region of the U.S., putting long-standing records in jeopardy. High temperatures are forecast to remain above 100 in El Paso through at least this coming weekend. Residents face risk of heat-related illnesses"Aside from daytime temperatures, heat may stick around at night. In Death Valley, California, high temperatures are set to reach the 120s beginning Wednesday and may even climb close to 130 degrees over the weekend.