#NOAA / #NWS issues excessive heat watch for #Barstow, #Yucca_Valley, #Needles, #Baker, #29_Palms in !SoCal Mojave desert. Also Las Vegas, Pahrump, Laughlin, Primm #NV and Kingman, Lake Havasu City, Bullhead City #AZ Temperatures in excess of 100°F capable of causing heat illnesses.