The National Weather Service office in Phoenix has an Extreme Heat Warning in effect until 8 p.m. on August 2. The confirmed fact is an active Extreme Heat Warning through August 2 with forecast highs of 110 to 116. The Extreme Heat Warning runs until 8 p.m. on August 2. Parker Valley and Yuma in Arizona, and the Imperial Valley and Palo Verde Valley in California, including El Centro, Calexico, Brawley, Blythe and Yuma. Do Arizona and California have the same worker heat rules?