Portland, OR – Dense fog is creating hazardous travel conditions across the Willamette Valley this morning, with visibility dropping to around one-quarter mile or less in parts of Portland, Vancouver, Salem, and Eugene.
According to the National Weather Service (NWS) Portland, the fog developed early Wednesday and is expected to linger through 10 a.m. PST, though some locations may clear earlier. The advisory includes interior lowland portions of northwestern Oregon and southwestern Washington, impacting thousands of morning commuters.
NWS meteorologists said the fog is thick enough to significantly reduce visibility on major routes including I-5, I-205, OR-99E, and OR-217, potentially causing slower travel times and abrupt visibility changes. Drivers are urged to use headlights, reduce speeds, and leave extra following distance. Pedestrians and bicyclists are advised to wear reflective or bright clothing due to limited sightlines.
The morning fog pattern is typical for the region this time of year, when cooler overnight temperatures and lingering moisture help dense fog form quickly before sunrise. Conditions are expected to gradually improve by late morning as temperatures rise and fog begins to lift.
Commuters across Portland and the surrounding metro are already reporting slower traffic and patchy areas of near-zero visibility, especially in lower-lying areas and near river crossings.
Travelers should remain alert for sudden changes in visibility and allow additional time for the morning drive. If fog persists beyond 10 a.m., the NWS may issue updated guidance.
How is visibility in your area this morning? Have delays impacted your commute?
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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