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

A Dense Fog Advisory has been issued for San Juan, Western Skagit, Northwestern Snohomish, and Island Counties until 12:00 PM PDT today, October 5th. Drivers should slow down, use headlights, and increase following distance due to hazardous low visibility.

Staff Writer
10/05/2026 · Mount Vernon edition

A Dense Fog Advisory has been issued by the National Weather Service (NWS) Seattle, WA, effective immediately until 12:00 PM PDT today, October 5th. This advisory impacts San Juan County, the Lowlands of Western Skagit and Northwestern Snohomish Counties, the Downtown Everett/Marysville Area, and Island County.

Drivers in these areas should be aware of significantly reduced visibility, with some locations experiencing one-half mile or less in dense fog. The NWS warns that these conditions could make driving hazardous.

If you are driving within the affected areas, the NWS advises slowing down, using your headlights, and maintaining plenty of distance between your vehicle and others. The advisory is set to expire at noon today, October 5th, 2026.

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