LOS ANGELES (CBSLA.com) — Below normal temperatures are expected all week, with the possibility of snow Tuesday and Wednesday affecting the Antelope Valley and mountain passes north of Los Angeles.

The storm system is expect to bring only a quarter inch of rain at most to urban areas of Southern California, the National Weather Service said, with the precipitation occurring Tuesday night into Wednesday afternoon.

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The biggest impact is forecast for the mountain freeway crossings north of Los Angeles as well as in the Antelope Valley cities of Lancaster and Palmdale, which are also expected to see accumulating snow, according to CBS2’s Kaj Goldberg. In those areas, the National Weather Service has issued a Winter Storm Watch for Tuesday afternoon through Wednesday afternoon.

As the system arrives Tuesday evening, the snow level in Los Angeles County is expected to drop to 2,000 feet, which could mean issues along the Grapevine on Interstate 5, where Tejon Pass reached 4,140 feet. Also potentially impacted would be the 14 Freeway at Acton, which is 2,700 feet above sea level, as well as the Cajon Pass on Interstate 15.

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Snow accumulation of 2-4 inches is possible in Palmdale and Lancaster, as well as cities in the High Desert. With winds out of the north, the highest accumulations are expected on the northern slopes of the San Gabriel Mountains, where the highest elevations at Wrightwood and Big Pine could see a foot of snow.

Highs are forecast to remain in the 50s and 60s in the valley and LA basin areas all week.

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