Extreme Heat Warning Sweeps Arizona and Southwest US

The National Weather Service issued an Extreme Heat Warning on August 5, lasting until August 9, for the Desert Southwest. Forecasts call for afternoon temperatures of 104 °F to 116 °F, with high humidity raising heat‑index values. The warning covers Arizona’s La Paz and Yuma counties and California’s Palo Verde Valley.

Health officials warn that the conditions increase the risk of heat‑related illnesses, from cramps and exhaustion to potentially fatal heatstroke. Recommended precautions include staying hydrated, wearing lightweight clothing, limiting outdoor activity to early morning or evening, and using public cooling shelters where available. The Occupational Safety and Health Administration advises frequent rest breaks in shaded or air‑conditioned areas for outdoor workers.

A Weather Authority First Alert Action Day remains in effect through Friday, reinforcing the same heat and humidity concerns. A ridge of high pressure will keep the region hot, with isolated storms possible on the eastern side. Cooler temperatures are expected early next week.