Heat wave sets in on West Coast with worst yet to come

NADINE EL-BAWAB, MAX GOLEMBO, JENNA HARRISON, MEREDITH DELISO and DANIEL AMARANTE

July 4, 2024 at 4:51 p.m.·2 min read

Some 170 million Americans are on alert for sweltering temperatures this Fourth of July as the brutal heat continues.

The prolonged heat could be one for the record books, and one of the worst heat waves in 18 years for parts of California.

PHOTO: Children play with the water features at a park as southern California faces a heatwave, in Los Angeles, on July 3, 2024. (Etienne Laurent/AFP via Getty Images)

The dangerous heat has already claimed the life of a 10-year-old boy who was hiking in Phoenix on Tuesday.

Heat alerts have been issued up and down the West Coast, with dangerously high temperatures forecast from Southern California up to Washington.

Heat alerts have been issued for Los Angeles, San Francisco, Seattle and Portland, Oregon. It is not common to get high heat this close to the coast and this far north.

PHOTO: Heat warnings are in effect Thursday along the West Coast. (ABC News)

Dozens of record highs are expected over the next week in the West. On Thursday, daily records could fall in San Angelo, Texas (projected: 104, record: 105); San Francisco (projected: 86, record: 85); and Medford, Oregon (projected: 106; record: 103).

Las Vegas also might make a run at its all-time highest temperature of 117 over the coming days; Sunday, Monday and Tuesday are all forecast to be within a degree or two of that record.

PHOTO: The heat index will soar above 100 degrees across the South on the Fourth of July. (ABC News)

MORE: Heat stroke vs. heat exhaustion: Extreme heat safety tips

In the South, heat and humidity will combine to deliver a heat index of more than 100 degrees in dozens of cities.

A heat advisory was issued for Philadelphia and Washington, D.C., where the heat index could reach 100 to 107 degrees on Thursday and Friday.

PHOTO: A temperature of 108 degrees is displayed on a bank sign in Sacramento, Calif., July 3, 2024. (Rich Pedroncelli/AP)

MORE: 10-year-old boy dies in Arizona after hiking in triple-digit temperatures

Several wildfires also exploded in the West due to dry conditions and ongoing heat.

Among the worst of those fires is the Thompson Fire in Butte County, California, north of Sacramento, which has grown to over 3,500 acres with 7% containment.

Some 28,000 people had been evacuated due to the fire, with evacuation orders still in place Thursday for parts of Butte County.

PHOTO: A helicopter flies over the Thompson Fire as it burns above Lake Oroville in Oroville, Calif., Tuesday, July 2, 2024. (Noah Berger/AP)

More than 12,000 structures are threatened, and four have been destroyed, amid the fire, officials said Thursday.

Temperatures in the region are expected to be as high as 110 degrees Thursday, which "increases the chances for fire growth," Cal Fire said.

Heat wave sets in on West Coast with worst yet to come originally appeared on abcnews.go.com

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