* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Ritzville, Moses Lake, Harrington, Wilbur, Grand Coulee, Odessa, Ephrata, Creston, Othello, Quincy, and Coulee City.
* WHEN...Until 9 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...Localized areas of one quarter mile to one half mile visibility. Many areas with patchy fog developing.