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A winter storm that will impact the Southland Thursday and Friday is expected to dump several more inches of snow on local mountains.

Forecasters are calling for accumulations of 6 to 10 inches above 5,000 feet, 10 to 15 inches above 6,000 feet and up to 30 inches above 7,000 feet.

A winter storm warning for the San Bernardino County mountains is in place from 3 p.m. Thursday through 3 p.m. Friday for areas above 5,000 feet, including the cities of Lake Arrowhead, Big Bear, Running Springs and Wrightwood. 

The Big Bear area already received about 2 feet of snow from this week’s earlier storm.

Los Angeles County mountains, excluding the Santa Monica range, are also under a winter storm warning from 3 p.m. Thursday through 3 p.m. Friday, according to the National Weather Service.

Travelers headed to the local mountains were warned to bring chains and be prepared for traffic delays.

Forecasters are calling for the storm to move out of the region Friday evening, leaving mostly sunny conditions for the weekend.

Further north, Mammoth Mountain was off to a slow start to its winter season but has already been buried under 5 to 6 feet of snow earlier this week, the resort’s Communications Director Lauren Burke said. Thursday’s storm is expected to bring another 3 feet of snow.

Burke warned that several roads are closed due to the recent storms and suggested conditions will be safer for motorists when sunny skies return next week.