An upper level disturbance passing through in the wee hours of Saturday morning, December 17, brought a round of light snow to southern Wisconsin. Snow began late Friday evening in the far southwest, near Prairie du Chien and Platteville. By midnight snow began in Sauk, Iowa and Lafayette counties; as the disturbance moved closer, the area of snowfall pushed eastward, eventually bringing a dusting (or more) to most of the southern half of Wisconsin. The greatest totals were reported in the southwest, where as much as 4 inches was measured. The snow gradually tapered off beginning around 6:00am Saturday morning, once again starting in the west, with the back edge progressing eastward. Snow ended in the Kenosha and Racine areas around 8:30am, but a few lingering flurries continued elsewhere.
The map below shows the amount of new snow received around Wisconsin between about 7:00am Friday, December 16, and about 7:00am Saturday, December 17. General Mitchell International Airport reported 0.3 inches and Dane County Region Airport reported 1.3 inches.
Now, a map of snow amounts reported by cooperative observers to our office in Sullivan. Like the map above, these totals are only through the time of the report, which for most sites is 7:00am. Totals may actually be slightly higher where it was still snowing at 7:00am (mainly east of Madison). Totals were typically an inch or more south and west of a line from the Dells to Lake Geneva. The Milwaukee, Port Washington, Sheboygan and Fond du Lac areas generally received only a dusting.