The tailings of Monday night's storm will hang around Ashland through today and tomorrow morning, with another storm expected to deliver up to three and a half inches Wednesday evening through Friday morning.
During that window, most likely Thursday night, the snowline is expected to dip near 1,000 feet, low enough to blanket most of the Rogue Valley, said Brett Lutz, a meteorologist for the National Weather Service in Medford.
"The specific timing is hard to pin down ... as one storm leaves and another moves in," he said.
The snowline is expected to climb above 2,000 feet before the end of today, and up to 3,000 feet by Wednesday morning, before creeping back to the valley floor, he said.
Lutz expects an inch or less of snow above 2,000 feet between today and Wednesday afternoon.
"For people in Ashland, it should be pretty minimal below the boulevard. People living on the hillside, above the boulevard, are going to see accumulating snow at times," Lutz said.
Ashland received between one and two inches of snow overnight, he said.
There was minimal snowfall overnight on Interstate 5 over Siskiyou Summit, but the Oregon Department of Transportation is requiring motorist carry chains or traction tires to traverse the icy road.
Up to three inches are anticipated for the Siskiyou Summit area before a winter weather advisory issued until 4 p.m. today ends, Lutz said.
Between Wednesday night and Thursday night, 6-10 inches of snow are expected to fall on Siskiyou Summit, Lutz said. Another 4-8 inches is expected to fall there on Friday into Saturday morning.
Today, more than 40 spinouts have been reported on state highways throughout Southern Oregon, but no injuries were reported, said Gary Leaming, an ODOT spokesperson.
Leaming said that because Monday night's storm dropped less than an inch of snow below 1,500 feet, most roads were sanded instead of plowed. Many of those roads became slick during the morning, after travelling motorists compacted the fresh snow into ice.
"Motorists should just keep in mind that conditions can change from minute to minute, from hour to hour," he said. "Leave with plenty of time to get to your destination and slow down."
— Sam Wheeler