The National Weather Service in Sioux Falls has issued a Dense Fog Advisory until 9am this morning for the following counties, Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon, O Brien, Osceola, Sioux, Rock MN, Nobles, MN, Jackson MN, Minnehaha SD and Lincoln SD. There is also a Dense Fog Advisory for Martin MN until 8am issued by the National Weather Service office in Minneapolis.

Visibilities of a quarter mile or less will be possible in these areas through mid-morning. The fog will begin to burn off at that time. Until then make sure to use low beams if you will be driving in these areas.

UPDATE: The National Weather Service in Des Moines has issued a Dense Fog Advisory until 9am for the following counties, Calhoun, Carroll, Crawford, Emmet, Humboldt, Kossuth, Palo Alto, Pocahontas, Sac and Winnebago