The National Weather Service in Portland issued a dense fog advisory early this morning, which is in effect until 9 a.m. But the fog should begin to gradually dissipate after sunrise.
Cities affected include Vancouver, Battle Ground, Ridgefield, Washougal, Yacolt, Longview, Kelso, Castle Rock, Portland, Wilsonville, Ore., Oregon City, Ore., Gresham, Ore., and a number of cities in the Central Willamette Valley and South Willamette Valley in Oregon.
Visibility is about a quarter of a mile or less, the National Weather Service says, and the fog is especially dense around Vancouver and downtown Portland.
Areas affected include portions of the Interstate 5 corridor and Oregon Highway 99W and Highway 99E, as well as other river valleys, which could make driving difficult. And it may be particularly difficult to see bicyclists and pedestrians, according to the National Weather Service.
