NWS Extends Extreme Heat Warnings Across Southern California, Arizona and Nevada

Overview

• National Weather Service offices updated and expanded alerts Wednesday, extending Extreme Heat Warnings and Heat Advisories through 8 p.m. PDT/MST on Sunday, August 9, for specified counties, valleys and parks in southern California, northwest Arizona and southern Nevada.
• Forecasts show the Mojave Desert reaching 110–120°F, inland valleys and Imperial County topping the low-to-mid 100s, and coastal/interior valleys seeing 90–105°F during the heat episode.
• Warnings stress a sharply higher risk of heat cramps, heat exhaustion and heat stroke and tell people to drink fluids, stay in air-conditioned places, avoid peak sun and call 911 for suspected heat stroke.
• Notices incorporate OSHA guidance for outdoor workers to take frequent shaded or air-conditioned breaks and direct people without home cooling to public cooling centers or the 2-1-1 referral service.
• The alerts are part of a broader heat-dome pattern that began in late July, which has already driven higher cooling demand, strained local services and raised wildfire and public-health concerns as overnight warmth limits physiological recovery.