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Dense Fog Advisory Issued for San Juan, Skagit, Snohomish, and Island Counties

A Dense Fog Advisory is in effect for San Juan, Island, Skagit, and Snohomish Counties until 12:00 PM PDT today, urging drivers to slow down and use headlights due to low visibility.

Staff Writer
10/05/2026 · Mount Vernon edition

Drivers in San Juan County, Island County, the Lowlands of Western Skagit and Northwestern Snohomish Counties, and the Downtown Everett/Marysville Area are advised to slow down, use their headlights, and leave extra distance due to a Dense Fog Advisory issued by the National Weather Service (NWS) Seattle WA. The advisory is effective immediately, October 5, 2026, at 5:07 AM PDT, and will remain in effect until 12:00 PM PDT today.

Visibility in affected areas is reported to be one-half mile or less due to dense fog. These conditions could make driving hazardous. The NWS emphasizes the importance of caution while operating a vehicle during this period of reduced visibility.

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