A strong winter storm will impact the upper Midwest and Great Lakes Sunday into Monday, bringing the potential for some very heavy snowfall. Locally, we will see the potential for liquid rain, a mix of sleet and snow, then all snow through the course of Sunday into Monday.
Precipitation will begin Saturday evening and Saturday night in a lighter fashion as mix of mainly rain and snow. By Sunday morning, better moisture will have arrived with much milder air. This flips things over to all rain through much of Sunday.
Once the low pressure system passes by, colder air will quickly work in from the Northwest. This will flip things over to a heavy mix and eventually heavy snow. Snow will then taper off through Monday afternoon. The passing system will also come with strong winds frequently gusting to 30-40 mph. Winds will be from the Southeast through Sunday afternoon, then flip to the Northwest Sunday evening/night. Once snow begins to fall, visibility will be greatly reduced.
While far too early to discuss exact snowfall totals, it looks increasingly likely that parts of Central and Northern Wisconsin may be able to pick up 8" or more snowfall Sunday into Monday with blizzard conditions possible at times. The exact axis of the heaviest snow will be determined by the track of the low pressure itself, with a sharp gradient of little to no snow on the Southern edge of the storm dominated by wintry mix or rain.
A winter storm watch has already been issued for nearly all of Wisconsin for that potential for heavy snow Sunday into Monday. This watch extends all the way to the Illinois/Wisconsin state line, but confidence on winter storm conditions is not quite high enough yet for a watch locally.
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