NWS Heat Briefing (July 30th – August 5th)NWS Heat Briefing (July 30th – August 5th)​KEY POINTS​Extreme Heat Warnings in effect for the Mojave Desert and southern Great Basin through Sunday night. ​Heat Advisories in effect for the Spring Mountains, Sheep Range, Eastern Sierra, and White Mountains through Sunday night. ​WEATHER RISK OUTLOOK​Risk levels incorporate potential impacts from weather hazards and likelihood of occurrence.