Snow expected throughout western Ore., Wash.

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PORTLAND, Ore. (AP) -- Forecasters say cold, wet air moving into western Oregon and Washington will dump snow across the region this weekend, dusting even the lowest elevations from Medford to Portland and Seattle.

Flurries were expected by Saturday evening and could last through Monday, leaving sporadic accumulations as low as sea level. Some areas of the Willamette Valley and the Seattle metro area could get an inch of snow, even more on hilltops. Several inches were expected in the Coast and Olympic ranges and upwards of a foot in the Cascades.

The National Weather Service issued winter weather advisories for much of the region through Sunday afternoon.

Transportation officials urged drivers to be prepared for snowy roads, limited visibility and black ice.