The National Weather Service released a dense fog advisory at 5:19 a.m. on Tuesday in effect until 11 a.m. for Clatsop County Coast, Tillamook County Coast, Central Coast of Oregon, North Oregon Coast Range Lowlands, Lower Columbia River, Tualatin Valley, West Hills and Chehalem Mountains, Inner Portland Metro, East Portland Metro, West Central Willamette Valley, East Central Willamette Valley, Benton County Lowlands, Linn County Lowlands and Lane County Lowlands.

The weather service states to be ready for, "Visibility one quarter mile or less in dense fog."

News Source : https://www.oregonlive.com/weather-alerts/2025/10/dense-fog-advisory-issued-for-oregon-until-tuesday-midday-quarter-mile-visibility.html