The coldest winter storm of the season is forecast to bring sleet and ice to mountains in Los Angeles County, the National Meteorological Service announced Monday.

Snow, ice, and winds of up to 40 mph are making driving conditions dangerous on Interstate 5 from Grapevine to Castaic, on Interstate 14 through Soledad Canyon, and on Interstate 33 through the Ventura County mountains.

Amongst the areas affected are mountainous areas of San Luis Obispo County, Santa Barbara County, Ventura County and Los Angeles County with the exception of the Santa Monica Mountains.

The National Weather Administration says chain control is in place on high areas of the Sierra, including Interstate 80.

The National Weather Service expects the cold weather to spread around to Antelope Valley and Cuyama Valley as the storm approaches.

Officers are warning drivers to bring extra food, warm clothing and chains to keep tires on.

Now, the winter storm, which pushes down into the Sierra from the north-east but does not affect California, the coast, is already making it difficult to cross the passes of the Sierra Nevada.

The cool temperatures will be followed by a month and a half of rainfall across the region and much of the state near zero, and some record-breaking winter temperatures.


National Weather Service

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Agency of the United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, (wikipedia)


Weather

Weather is the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloudy. On Earth, (wikipedia)