Cold air clinging stubbornly in Southern Oregon valleys could freeze light rains expected in the region tonight and leave the ground glazed with ice, the National Weather Service warned.

Cold air clinging stubbornly in Southern Oregon valleys could freeze light rains expected in the region tonight and leave the ground glazed with ice, the National Weather Service warned.

The weather service's Medford office issued a winter weather advisory on the risk of freezing rain in Jackson, Josephine and eastern Curry counties tonight into early Sunday.

Between 6 p.m. today and 4 a.m. Sunday, light freezing rain could fall at elevations lower than 1,500 feet, the advisory said.

Modest amounts of rainfall and winds concentrated in the upper levels of the atmosphere might not be enough to whisk out the cold air that has been trapped in inland valleys in recent days.

"There's cold, stubborn air stuck in the valleys, so it could stay around freezing overnight," said meteorologist Mike Stavish.

That would turn the rain to ice, potentially making travel difficult.

"A little freezing rain can go a long way in creating dangerous driving conditions," Stavish wrote in the advisory, noting that even minor ice accumulations can turn roads treacherous.

Travelers should monitor road conditions and be prepared for winter driving, the advisory said.