National Weather Service United States Department of Commerce

March 4-5, 2025 -- Rain, Snow & Wind Event Summary

Event Overview

Deep low pressure originating over the southwestern United States - sometimes termed as a “Colorado Low” - lifted into the western Great Lakes by daybreak Wednesday, March 5. The low resulted in a multi-faceted hazardous weather event across central and northeast Wisconsin including heavy rain, strong winds, and heavy snow beginning on the afternoon of Tuesday (March 4) and continuing through the early evening of Wednesday, March 5. Highlights from this storm included almost 2 inches of total liquid precipitation over northern portions of Door County, around a foot of snow leading to snow covered roads and difficult travel over north-central Wisconsin from Vilas to Florence counties, and gusty winds reaching as high as 54 mph at Wausau.

To start off, a swath of moderate to heavy rain arrived from the south early Tuesday evening and spread across the entire area. A few lightning strikes also accompanied the rain in the Wausau area. As cold air worked in from the north, the rain quickly changed to snow as early as 9 pm at Rhinelander. Heavy snow fell the rest of the evening with snowfall rates of 1”/hr observed through midnight. In areas further south and east where precipitation didn't change over to snow, the rain became heavy at times overnight, pushing many rivers in the area above bankfull. Some additional minor flooding and ponding was also reported in low-lying and poor drainage areas. The rain finally fully switched over to snow over portions of central Wisconsin shortly before daybreak early Wednesday morning.

As the low shifted over central Lake Michigan through the latter part of Wednesday morning, the remaining areas of rain changed over to rain across the rest of central and northeast Wisconsin. Despite the switch to snow relatively early in the day, little to no accumulation was observed across east-central Wisconsin due to the relatively warm ground temperatures across eas- However, warmer ground temperatures still present. Accumulations didn't really start in these areas until around midday when ground temperatures finally dropped below freezing, but were limited mainly to grassy areas and untreated roads. Northerly winds were on the increase during this time, with gusts increasing up to over 40 mph from west to east through the early afternoon. The combination of wind and snow led to considerable blowing and drifting snow and poor visibility down to 1/4 to 1/2 mile at times. The worst of the snow, blowing snow, and poor visibility for the Fox Valley and east-central Wisconsin occurred late Wednesday afternoon, resulting in a slower than normal evening commute.

As the low tracked into northern lower Michigan Wednesday afternoon, snow began to diminish over north-central and central Wisconsin. The gusty winds did lead to lingering blowing snow in open areas. The last of the snow ended by mid-evening over northeast and east-central Wisconsin. Temperatures falling into the teens and 20s Wednesday evening caused any lingering moisture from the earlier rain and snow to freeze on roads and surfaces, resulting in icy conditions on untreated roads for the next morning.

The highest snowfall totals were observed across northern Wisconsin, with widespread amounts of 8 to 12 inches. The rest of the area saw lesser snow amounts, generally from 1 to 5 inches, due to a slower than expected change from rain to snow and the warmer ground temperatures at the start of the change over to snow. All areas saw moderate to heavy precipitation totals (rain and melted snow combined) of 0.75 to 1.50 inches, and isolated amounts from 1.50 inches to nearly 2 inches. The gusty winds affected most of the area as well, reducing visibility due to the falling snow and causing tree limbs to break under the weight of the wet, sticky snow, which led to sporadic power outages.

Please see tabs below for more information.

Radar Loop from 3pm Tue, March 4, 2025 - 11pm Wed, March 5, 2025

 

 

 

 

Mean Sea Level Pressure Analysis with station plots showing the track of the surface low pressure system from 12am-11pm Wed, March 5, 2025.

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