Tucson, Arizona — An Extreme Heat Watch could bring unusually hot conditions across southern Arizona valleys later this week.
According to the National Weather Service in Tucson, temperatures may reach 95 to 100 degrees from Thursday morning through Sunday evening across several lower-elevation areas of southeastern Arizona.
The watch covers the Upper Santa Cruz River Valley and Altar Valley, Upper San Pedro River Valley, Upper Gila River Valley, and eastern Cochise County below 5,000 feet. Cities included in the alert area include Nogales, Sierra Vista, Douglas, Willcox, Benson, Safford, and Clifton.
Forecasters say the hottest period is currently expected Friday, March 20, and Saturday, March 21, when temperatures could approach or exceed the upper end of the forecast range.
Heat-related illnesses become significantly more likely during prolonged high temperatures, particularly for people spending extended time outdoors. The weather service noted that visitors, seasonal residents, and those not acclimated to extreme desert heat may face elevated risk, especially during the hottest hours of the afternoon.
Residents are urged to take precautions such as limiting strenuous outdoor activity, wearing lightweight clothing, and staying hydrated. Officials also warn that children and pets should never be left inside parked vehicles, where temperatures can rise to lethal levels within minutes.
Workplaces with outdoor labor should consider frequent shaded or air-conditioned breaks, following guidance from the Occupational Safety and Health Administration.
Anyone experiencing symptoms of heat exhaustion or heat stroke should seek immediate cooling and medical attention. Heat stroke is considered a medical emergency, and officials advise calling 911.
Commuters, outdoor workers, and students participating in late-week activities may face the greatest exposure during afternoon hours.
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