Summary of January 29-30, 2013 Winter Storm
The January 29-30, 2013 winter storm was the first widespread storm to affect Wisconsin for the entire month of January, 2013! It was preceded by rains of 0.50 inch to 1.5 inches prior to changing over to snow. Most of the precipitation fell over the southeast half of the state.
Prior to the snowfall late January 29th into January 30th, southern Wisconsin had 3 days with at least some rain falling. In fact, at least some lightning & thunder occurred somewhere in southern Wisconsin on three consecutive days - January 27th-28th-29th. This is very rare for January!
Colder air filtering in eventually forced the rain to change to snow over southern Wisconsin Tuesday night into Wednesday morning. A band of moderate to heavy snow then moved across south-central and portions of southeast Wisconsin on Wednesday. The wind gradually changed from northeast to northwest 10 to 20 mph with gusts to around 30 mph. During the morning hours of Wednesday visibilities dropped to 1/4 to 1/2 mile at times. Some blowing and drifting snow was reported. The morning rush hour was impacted as commute times increased. The media reported a fair number of vehicle accidents. Snowfall rates tapered off during the mid to late afternoon hours.
The graphics below show the snow that fell across southern Wisconsin in 24-hour periods ending Wednesday and Thursday mornings around 7 am CST. Corresponding statewide images are also provided. Click on them for a larger image.
The heaviest snow fell to the north and northwest of Madison in a wide band stretching from the Platteville area northeast to the Green Bay and Door County area. Snowfall amounts in this band ranged from 6 to almost 12 inches. Richland Center in Richland County came in with the highest total of 11.5 inches. A few of the higher snowfall totals include 8.3 inches in Green Bay, 9 inches at Portage, Westfield and Berlin, and 10 inches at Reedsburg.
In addition, a new daily record snowfall amount of 5.8 inches was recorded at Dane County Regional Airport in Madison. This broke the previous record for January 30th of 4.2 inches, set in 1947.
The graphics below show the liquid precipitation amounts that occurred in 24-hour periods ending Wednesday and Thursday mornings around 7am CST. Corresponding statewide images are also provided. Click on them for a larger image.
Below are 2-day Southern Wisconsin and statewide graphics for liquid precipitation and snowfall. They are based on cooperative observer reports - some reports may be missing that result in the donut-hole appearance. Up to 1.75 to almost 2 inches of liquid precipitation was measured over the southeast corner from southeast Walworth County into Kenosha County. Click on them for a larger image.
A storm summary for northeast Wisconsin can be found here.
A storm summary for west-central and southwest Wisconsin can be found here.
Record High Temperature and Precipitation Amounts Set Tuesday, January 29, 2013
Very warm air ahead of a cold front allowed high temperatures to reach record values on Tuesday. The high temperature Tuesday in Milwaukee was 60 degrees, breaking the previous record of 56 degrees, set in 1914. The high in Madison was 54 degrees, breaking the previous record of 53 degrees, also set in 1914.
These temperatures came close to the all-time record high temperatures for January at both sites. The all-time record high temperature for January in Milwaukee is 63 degrees, set on January 7, 2008. The all-time record high temperature for January in Madison is 58 degrees, set on January 6, 1880.
The widespread heavy rainfall across the area lead to record precipitation vales on Tuesday as well. 1.67 inches of rainfall was recorded in Milwaukee, breaking the previous daily record of 1.27 inches, set in 1909. Over in Madison, 1.84 inches of rainfall was recorded, breaking the previous daily record of 0.98 inches, set in 1869. The 1.84 inches also broke the highest one-day precipitation amount for January in Madison. The previous one-day record was 1.80 inches, set on January 1, 1892.
NWS Milwaukee/Sullivan, WI