The weekend is off to a sizzling start as more than one-third of US residents are under heat advisories, and additional cities are expected to experience record temperatures in the coming days.

Iran Press/ West Asia: The list includes customarily hot Las Vegas, where temperatures are expected to be near 114 degrees Saturday and even hotter Sunday, when it could break the daily record of 116.

Nearly 130 million people in both the West and East are under heat alerts across 18 states and the District of Columbia, CNN reported.

“These conditions will be extremely dangerous and potentially deadly if not taken seriously,” meteorologists with the National Weather Service’s Weather Prediction Center said in a forecast discussion. “The multi-day nature of the heat and record warm overnight temperatures will cause heat stress to build in people without adequate cooling and hydration.”

The dangerous heat will expand into the Intermountain West and northern High Plains by next week, forecasters say.

Extreme heat is one of the leading weather-related killers in the United States, leaving hundreds of people dead each year, according to the weather service.

In San Jose, California, a homeless man died Tuesday due to the extreme heat, Mayor Matt Mahan said. The man was 69, according to the mayor’s spokesperson, Tasha Dean, citing information from the Santa Clara Medical Examiner’s Office.

The same day, a 10-year-old died in Arizona after experiencing a heat-related emergency while hiking with family in South Mountain Park and Preserve, the Phoenix Police Department said.

Also in Arizona, a 69-year-old hiker from Austin, Texas, died last week after hiking at the Grand Canyon, according to the National Park Service. Heat was a contributing factor, officials said.

Major to extreme heat risk, the highest 2 levels, are expected for much of California and the Southwest on Saturday and Sunday, meaning health impacts from heat become more likely in anyone without adequate hydration or cooling.

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