Interstate 15 could be affected by winter storms beginning late Friday. Photo courtesy OnScene.TV

The weekend forecast includes rain and snow, with warnings of wintry travel conditions beginning late Friday in parts of San Diego, according to the National Weather Service.

Precipitation amounts through Saturday night will total one-tenth of an inch to a half-inch west of the mountains, from one-quarter to three-quarters of an inch in the East County highlands, and from a hundredth to a tenth of an inch in the deserts, forecasters said

Meanwhile, light snow falling along busy freeway mountain passes could trigger hazardous conditions along Interstates 8 and 15, forecasters said.

The winter weather advisory will be in effect for 24 hours beginning at 10 p.m. Friday above elevations of 4,000 feet.

The warnings are for San Diego County mountain areas, including Julian and Pine Valley.

The conditions also are expected to affect San Bernardino County and Riverside County mountain communities, including Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood and Idyllwild-Pine Cove.

The weather service expects from 1 to 3 inches of snow around 4000 feet, and 3 to 8 inches above 5000 feet.

Motorists should be aware of slippery roads, reduced visibility at times and other hazardous winter conditions.

Though San Diego experienced summery, dry conditions last week, expect more snow should arrive next week. A more intense and colder winter storm is expected to arrive late Sunday and continue through Monday night.

Snow levels then will fall below 3,000 feet, and perhaps down to 1,500 feet in the high deserts. Accumulations in the mountains will be from 6 to 18 inches, the NWS advised.

Rain amounts during the follow-up storm will range from 0.5 to 1.5 inches west of the mountains, meteorologists said.

 – Staff and wire reports

Updated at 7:10 p.m. Jan. 21, 2021

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