Wisconsin Weather

Snow Developing New Years Eve

A developing storm system will impact Wisconsin tomorrow (New Years Eve). Snow will begin early Monday morning in the north. Towards the mid day hours rain or freezing rain will move into southern Wisconsin from Illinois. A transition to snow will occur with several inches of snow accumulation expected overnight Monday into early Tuesday morning.

Wisconsin Weather
Snow begins around midnight tonight in the north. Freezing rain or rain transitions to snow in the south Monday afternoon and evening.

The National Weather Service has issued a Winter Storm Warning for Douglass, Bayfield, Ashland, and Iron counties. A Winter Weather Advisory for southern and eastern Wisconsin starting tomorrow until 3am Tuesday, i.e New Years Eve.

Wisconsin Weather
Current watch and warning situation.

Northern Wisconsin

Snow begins around midnight tonight and lasting through Monday night, ending as light snow or flurries. Minor lake enhancement is expected and may continue will into Tuesday morning. 4-8" in far northern counties; Bayfield Peninsula and Gogebic Range of Douglas, Bayfield, Ashland, and Iron counties extending into upper Michigan. A sharp gradient in snow accumulation from Ashland to Park Falls. Trace to 1" amounts from Eau Claire to Iron Mountain. A hint of freezing drizzle is possible across Minnesota. See the map below for snowfall predictions.

Southern Wisconsin

Wisconsin Weather
Snow accumulation prediction map for Monday night into early Tues AM.

Monday will start quiet in southern Wisconsin. After 9am rain will move in from the south and begin to transition. Freezing rain (or freezing sleet) is possible during the mid-day hours as surface temperatures remain at or below freezing. This may cause slippery travel conditions on untreated surfaces. A change to snow will occur Monday afternoon and early evening with deteriorating travel conditions. Snow could be briefly heavy Monday night. Early Tuesday morning snow diminishes to light snow or flurries ending gradually.

  • SNOW ACCUMULATION - 4-8" along a narrow axis across eastern Wisconsin. This includes Green Lake, Oshkosh, Fond Du Lac, Appleton, and Chilton. This is based on the expectation that a narrow band of snow will setup specifically across this region. I think one or two spots go up to 7 or 8" but not everyone. 2-4" for the rest of southern Wisconsin with lower amounts along the WI/IL border and the Milwaukee lake shore. Visit our facebook page for the latest information.

  • FREEZING RAIN - A light glaze of freezing rain is possible in southern Wisconsin, up to 0.10" of ice accumulation. Will be watching this threat closely. I'm not too concerned for Wisconsin given timing during peak daylight. Seems like lower Michigan will be most at risk.

Wisconsin Weather
Wisconsin Weather

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Simulated Reflectivity

This is the NAM 3km simulated reflectivity loop for Monday AM through 3AM Tuesday.

Wisconsin Weather
NAM simulated reflectivity for Monday AM through 3AM Tuesday.

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