Dense Fog Advisory

Locations Affected

Portland, OR ∙ Vancouver, WA ∙ Salem, OR ∙ Gresham, OR ∙ Beaverton, OR ∙ Hillsboro, OR ∙ Brush Prairie, WA ∙ Deer Island, OR ∙ Sunnyside, OR ∙ Sauvie Island, OR

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Portland OR 1039 PM PDT Sat Oct 31 2026 ...DENSE FOG ADVISORY REMAINS IN EFFECT FROM 1 AM TO 10 AM PST SUNDAY... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Oregon, East Central Willamette Valley, East Portland Metro, Inner Portland Metro, Lower Columbia River, Tualatin Valley, and West Central Willamette Valley. In Washington, Cowlitz County Lowlands, East Clark County Lowlands, Inner Vancouver Metro, and North Clark County Lowlands. * WHEN...From 1 AM to 10 AM PST Sunday. * IMPACTS...Low visibility could make driving conditions hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down and leave plenty of distance ahead of you. Pedestrians and cyclists should wear bright or reflective clothing to increase the chances of being seen by others in poor visibility conditions.

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