LOS ANGELES (AP) — 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 holding 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. That was certainly the case over the weekend: 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 Sunday at Death Valley National Park in eastern California, where a visitor died 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 hospital in Las Vegas for “severe heat illness,” the statement said.

The other four members of the party were treated at the scene. “High heat like this can pose real threats to your health,” said park Supe.