An Overview of the December 3rd-4th Snowfall Event
A swath of 3-6 inches of wet snow fell across the Central Plains and Upper Midwest Saturday December 3rd through the early hours of Sunday December 4th. A low pressure system was responsible for this snowfall. The event began with some freezing rain and rain, but by early afternoon, enough cold air had filtered in to change the rain to snow. This occurred first across southeast Minnesota and west central Wisconsin. The widespread precipitation continued throughout the evening, with the rain/snow line moving at a crawl to the southeast. For example, in La Crosse county, snow was observed in Holmen WI at 2:45 pm, but didn't change over to snow until 4:45 pm at the La Crosse airport and 6:45 pm at the NWS La Crosse office. That computes to a speed around 2.5 mph. Much of the heaviest precipitation occurred in the evening, with snowfall totals by midnight of up to 5 inches, greatest in St. Ansgar, IA, Winona, MN and the northwest side of Holmen, WI. Where precipitation stayed as rain, some of the totals were high too where across eastern Iowa and southwest Wisconsin, rainfall amounts over 1 inch were reported.