(CBS SF) — California ski resorts are opening up the slopes early thanks to a hefty snowfall and cold weather.

Boreal near Lake Tahoe plans to open on Friday in addition to Mountain High in Southern California.

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Skiers and snowboarders flocked to Mammoth Mountain Thursday, the earliest opening since the drought began five years ago. The resort reported it was 16 degrees at the main lodge at 6 a.m. Friday.

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A storm earlier in the week brought widespread rain and more than a foot of snow to the Sierra.

Combined with a cold, dry air mass, ski resorts were able to crank up their snow-making machines.

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