Overview
- Issued at 9:56 p.m. Friday, the advisory covers West Central and East Central Willamette Valley until 11 a.m. Saturday.
- Forecasters warn visibility can fall to one-quarter mile or less in widespread dense fog.
- Drivers should slow down, use low-beam headlights or fog lights, and avoid high beams to reduce glare.
- In near-zero visibility, officials advise pulling into a safe location, keeping only hazard flashers on, setting the emergency brake, and releasing the brake pedal.
- An additional advisory issued at 11:56 p.m. covers the Lower Columbia River area, Tualatin Valley, West Hills and Chehalem Mountains, and the inner Portland metro through late morning.