A cold storm has descended on the mountains of Southern Oregon this morning, and snow could fall as low as Ashland tonight.

A cold storm has descended on the mountains of Southern Oregon this morning, and snow could fall as low as Ashland tonight.

The National Weather Service has issued a winter weather advisory today that remains in effect until 1 a.m. Saturday.

It says travelers should expect snow-covered roads and limited visibility on Interstate 5 around Siskiyou Summit, on the Mount Ashland ski road and in the Highway 62 area between Union Creek and Diamond Lake.

Snow was falling at about 4,000 feet this morning, and the weather service said accumulations of 6 to 14 inches are expected, with more possible above 5,500 feet.

Temperatures at the freeway's Siskiyou Summit this morning hovered around freezing. Wet snow was falling, and drivers were encountering spots of ice, according to the Oregon Department of Transportation.

The forecast for today is for snow as low as 3,500 feet, with the snow level falling to 2,500 feet by evening and 2,000 feet — Ashland's elevation — after midnight. The weather service is forecasting accumulations of up to an inch.

The snow level should rise to 3,000 feet Saturday morning and 3,500 feet by afternoon, the weather service says, and precipitation should taper off.