On Thursday, 117 national parks are under heat alerts in 24 states and territories. Since May, 77% of the country’s 423 national parks have experienced at least one alert about extreme heat.
As high temperatures continue to engulf much of the country, researchers with the Union of Concerned Scientists say more national parks across the country are experiencing heat alerts.
Organ Pipe Cactus National Monument in Arizona and Chamizal National Memorial in Texas have seen more than 32 heat alerts so far this summer. The months between May and October are already considered “danger season,” when extreme heat isn’t only worse than other times of year but more common. Some of the country’s most prized national parks are already located in some of the hottest places in the United States, including Death Valley, which recently hit 128 degrees and claimed the life of a 71-year-old hiker last week. Five people are suspected to have died from extreme heat in national parks since June, including a man and his stepson who died while hiking in 119-degree heat in Big Bend National Park in Texas last month.
Heat exhaustion manifests in elevated body temperature, dizziness, headache, heavy sweating, decreased urination, nausea, thirst, irritability and fatigue, but heat stroke can happen suddenly and is more deadly. Heat stroke happens when a body gets so hot it is unable to control temperature by sweating. Symptoms include a high temperature of 103 degrees or more, confusion, slurred speech, seizures, fainting and skin that is hot, red, and dry, according to the U.S.
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