Snow clearning in Big Bear
Snow clearing in Big Bear on Tuesday morning. Courtesy OnScene.TV

A winter storm warning indicating dreadful travel conditions will be in force Tuesday morning in the San Gabriel Mountains, forecasters said.

“An upper low southwest of California will wrap moisture back across the San Gabriel Mountains, becoming heavy at times … resulting in snowfall of 12 to 18 inches above 5,000 feet,” according to a National Weather Service statement. “Significant blowing and drifting snow will be possible due to gusty north-northeast winds in the mountains. Use extreme caution if heading into the mountains, allow extra travel time, and have a winter survival kit.”

The NWS said snow will taper to scattered snow showers by Tuesday afternoon with little additional accumulations.

In effect Tuesday in the San Gabriel Mountains is a wind advisory that will expire at 9 p.m., followed by an even more serious high wind warning from 9 p.m. until 8 a.m. Wednesday. The advisory indicates 35-mile-per-hour winds while the warning heralds winds or gusts of 58 mph. The Interstate 5 corridor will be especially windy.

A high wind warning will also be in effect from 9 Tuesday evening until 8 Wednesday morning in the Antelope Valley. Gusts of 60 mph are expected Tuesday evening both in the mountains and the Antelope Valley.

In the event of heavier snow squalls, 12 to 18 inches of snow could accumulate above 5,000 feet, warned the NWS statement. At the same time, gusty north-to-northeast winds of up to 45 miles per hour will create near-whiteout conditions at times. These conditions will be especially prevalent in the Big Pines, Wrightwood and Mt. Baldy Resort areas, according to the statement.

“Plan on difficult winter travel conditions. Main roadways to be impacted include Angeles Crest Highway, Big Pines Highway, and Mt. Baldy Road. Be prepared for significant reductions in visibility at times,” it said.

The NWS noted that a Winter Storm Warning means severe “winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency.”

The weather service forecast partly cloudy skies Tuesday morning and a 20 percent chance of measurable precipitation in the Greater Los Angeles area, followed by sunny conditions.

It said another trough moving southeast over the Great Basin will bring gusty winds and a slight chance of showers late Tuesday evening and early Wednesday.

“Otherwise, dry and warmer weather accompanied by locally gusty offshore winds will prevail Thursday through next weekend, according to the NWS.

The NWS forecast partly cloudy skies in L.A. County Tuesday, along with highs of 53 degrees on Mount Wilson; 59 in Avalon; 61 in Palmdale; 62 in Lancaster; 66 at LAX; 68 in Long Beach; 69 in Burbank and Downtown L.A.; and 70 in Pasadena, San Gabriel and Woodland Hills.

Sunny weather was forecast in Orange County, along with highs of 46 on Santiago Peak; 57 on Ortega Highway at 2,600 feet; 63 in Fremont Canyon; 64 in Trabuco Canyon; 61 in San Clemente; 62 in Laguna Beach; 64 in Newport Beach; 67 in Mission Viejo; 68 in Yorba Linda; 69 in Irvine; and 70 in Fullerton and Anaheim.

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