A snow advisory warns of continued snowfall across Southern Oregon today.

A snow advisory warns of continued snowfall across Southern Oregon today.

The advisory issued by the National Weather Service's Medford office went into effect at 6 a.m. today and continues until 4 a.m. Friday. It predicts light snow on the floor of the Rogue Valley this morning with the snow level gradually rising to 2,500 to 3,000 feet by late this afternoon. Snow will continue through tonight with the snow level remaining steady near 2,500 feet.

The lower foothills surrounding the valley likely will collect about an inch of snow by early afternoon, while elevations above 2,500 feet can expect 1 to 3 inches, the advisory said. The chance of precipitation in Medford is 100 percent today, the forecast said.

Elevations above 3,000 feet, such as the Kalmiopsis Wilderness area of Josephine County and the higher peaks of the Umpqua Divide, may see a total of 4 to 9 inches by Friday morning, the advisory said.

An accumulation of 4 to 10 inches is expected in the Southern Oregon Cascades and 3 to 8 inches in the Siskiyous by this evening. Another 3 to 8 inches of snow could fall overnight.

Conditions reported at about 7 a.m. on the Siskiyou Pass include snow flurries and spots of ice on the roadway. Drivers must carry chains.

Chains are required for large and towing vehicles on Highways 66 and 140, which are covered with packed snow.

— Anita Burke