Authorities on Tuesday announced a round of mountain road closures amid a cold weather storm.

Authorities on Tuesday announced a round of mountain road closures amid a cold weather storm. (Times Community News / February 19, 2013)

Roads in the Angeles National Forest were closed early Tuesday because of an incoming storm expected to dump snow and rain across the Los Angeles region and bring cold weather and heavy winds.

The storm is expected to descend on the region beginning Tuesday morning and last through Wednesday, according to the National Weather Service.

"Due to the cold and unstable nature of this system, there is a possibility of thunderstorms, capable of producing brief heavy downpours, small hail and isolated waterspouts," the agency said in a statement.

Rainfall amounts are expected to range from 0.33 inches to 0.66 inches, and up to 10 inches of snow could blanket mountains above 4,500 feet, the agency said. Winds will blow up to 25 mph with gusts as high as 40 mph.

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-- Robert J. Lopez, Los Angeles Times