* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Airway Heights, Worley, Downtown Spokane, Post Falls, Coeur d'Alene, Spokane Valley, Rockford, Cheney, Davenport, Fairfield, and Hayden.
* WHEN...Until 10 AM PST Friday.
* IMPACTS...Low visibility could make driving conditions hazardous. Conditions may change rapidly.
* ADDITIONAL DETAILS...Localized areas of one quarter mile to one half mile visibility. Many areas with patchy fog developing.