A cold front is sweeping through western Oregon, bringing the potential for snow from the coast to the Cascades.
A winter weather advisory is in effect Monday night through Tuesday morning along much of the coast and the Willamette Valley, including the Portland metro area.
Multnomah County has declared a state of emergency and officials said the county will open three severe weather shelters. Officials said no one will be turned away from the shelters and pets are welcome. Information about the shelters, as well as details about transportation to reach them, is available by calling 211.
The National Weather Service said a dusting of snow up to an inch deep could accumulate in areas below 500 feet overnight, with heavier snow showers in some spots at higher elevations.
Winter storm warnings are in effect for the Coast Range, the Cascades and much of Southwest Oregon, where more than a foot of snow could fall in areas over 1,500 feet.
Drivers should expect difficult travel conditions at higher elevations late Monday night and Tuesday morning.