Dense Fog Advisories are scattered around South Dakota for tonight and into Christmas as reduce visibilities have been reported from dense fog.
At 11:00pm CST, the city of Rapid City was reporting a visibility of a half of mile from freezing fog. Out towards the east, Watertown had a reduce visibility of a quarter mile and in Brookings it was down to less than two miles.
Conditions were a little better in Aberdeen with a visibility of four miles and in Huron it was at five miles. These places are not sitting on a dense fog advisory.