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A powerful storm that swept through Southern California during the Thanksgiving holiday turned Big Bear Mountain Resort into a winter wonderland by its opening day Friday.

Another 18 inches of snow fell on the mountain overnight, bringing the 48-hour total to 4 feet at the top and 42 inches at lower elevations, according to the resort.

Those looking to partake in opening day at Bear Mountain may run into a major snag — how to get to there.

With a winter storm warning still in effect, and snow expected through Friday night, all of the roads leading to Big Bear remain closed for non-residents.

State Route 18 was open at one point from Lucerne Valley, but was closed by mid-afternoon when a big rig and motor home became stuck on the roadway, according to Caltrans. The stretch of the 18 from Running Springs to Big Bear has also been shut down.

However, for those looking to leave, the 18 was open out of Big Bear to Lucerne Valley.

Highway 38 is closed and will remain so all day.

The 330, meanwhile, was closed to the general public, but accessible to residents with a valid ID, Caltrans tweeted shortly before 4 p.m.

Anyone heading to the mountains by car must have chains, even those in vehicles with four-wheel drive, according to Caltrans.