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A long-running heat wave that has already shattered previous records across the U.S. persisted on Sunday, baking parts of the West with dangerous temperatures that caused the death of a motorcyclist in Death Valley and held the East in its hot and humid grip.
An excessive heat warning — the National Weather Service’s highest alert — was in effect for about 36 million people, or about 10% of the population, said NWS meteorologist Bryan Jackson. Dozens of locations in the West and Pacific Northwest tied or broke previous heat records.
Many areas in Northern California surpassed 110 degrees (43.3 C), with the city of Redding topping out at a record 119 (48.3 C). Phoenix set a new daily record Sunday for the warmest low temperature: it never got below 92 F (33.3 C).
A high temperature of 128 F (53.3 C) was recorded Saturday and Sunday at Death Valley National Park in eastern California, where a visitor died Saturday from heat exposure and another person was hospitalized, officials said.
The two visitors were part of a group of six motorcyclists riding through the Badwater Basin area amid scorching weather, the park said in a statement.
The person who died was not identified.
The other motorcyclist was transported to a Las Vegas hospital for “severe heat illness,” the statement said. Due to the high temperatures, emergency medical helicopters were unable to respond, as the aircraft cannot generally fly safely over 120 F (48.8 F), officials said.
The other four members of the party were treated at the scene.
“While this is a very exciting time to experience potential world record setting temperatures in Death Valley, we encourage visitors to choose their activities carefully, avoiding prolonged periods of time outside of an air-conditioned vehicle or building when temperatures are this high,” said park Superintendent Mike Reynolds.
Officials warned that heat illness and injury are cumulative and can build over the course of a day or days.
“Besides not being able to cool down while riding due to high ambient air temperatures, experiencing Death Valley by motorcycle when it is this hot is further challenged by the necessary heavy safety gear worn to reduce injuries during an accident,” the park statement said.
