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Avalanches wallop Mammoth, Squaw Valley

Mikaela Shiffrin competes in the first run of the Audi FIS World Cup Ladies' Giant Slalom on March 10, 2017 in Squaw Valley, California.
Mikaela Shiffrin competes in the first run of the Audi FIS World Cup Ladies' Giant Slalom on March 10, 2017 in Squaw Valley, California.
Ezra Shaw/Getty Images

An avalanche has prompted the closure of a second major California ski resort in as many days.

The Mono County Sheriff's department says three people were partially buried but unhurt by an avalanche Saturday at Southern California's Mammoth Mountain ski resort.

Resort officials said the avalanche occurred at about 10:15 a.m. while resort workers were in an area closed to the public attempting so-called avalanche mitigation, which includes purposely creating smaller slides.

Madison Taylor Barrett falls on a practice run during the 2016 U.S. Snowboarding Grand Prix at Mammoth Mountain Resort on January 20, 2016 in Mammoth, California.
Madison Taylor Barrett falls on a practice run during the 2016 U.S. Snowboarding Grand Prix at Mammoth Mountain Resort on January 20, 2016 in Mammoth, California.
Sean M. Haffey/Getty Images

The avalanche poured down the mountain and into an open run crowded with skiers and boarders. The resort then closed for the day.

On Friday, an avalanche in Northern California injured two people and closed Squaw Valley ski resort.

Heavy storms have drenched coastal areas and dumped more than 6 feet of snow in some higher elevations.

McRae Williams competes in the final round of the  Men's Freeski Slopestyle during the Toyota U.S. Grand Prix on on January 21, 2018 in Mammoth, California.
McRae Williams competes in the final round of the Men's Freeski Slopestyle during the Toyota U.S. Grand Prix on on January 21, 2018 in Mammoth, California.
Sean M. Haffey/Getty Images

Avalanches kill approximately 30 people each year in the United States. Twenty-five percent of people caught in an avalanche are killed by the trauma, the rest die from asphyxiation, according to NPR. Most avalanches occur right after a fresh snowfall.