Phoenix, Arizona – Triple-digit heat is bearing down across the Desert Southwest, with temperatures in the mid to upper 110s likely to break daily records through Friday. According to the National Weather Service, central and southern Arizona will see the most significant impacts, where a widespread Major to Extreme HeatRisk stretches from Phoenix and Tucson west toward southern California and south into New Mexico.
Heat-related illness will be a growing threat, especially for those without reliable cooling or hydration. Major highways including I-10, I-17, and I-8 across Arizona and southern California could see increased breakdowns and emergency calls as engines overheat and travelers struggle with the intense sun. Outdoor workers, older adults, and young children are especially vulnerable; local hospitals are already on alert for spikes in heat exhaustion cases.
Officials urge everyone to avoid outdoor activities during peak afternoon hours, check on neighbors, and ensure pets have shade and water. Charge devices and prepare for possible power disruptions as grid demand soars. Some relief is expected by Saturday as temperatures ease, but high humidity may keep overnight conditions uncomfortably warm…