Northeast and North-Central Wisconsin Weather Events of 2011
National Weather Service Green Bay


(Events listed in order of occurrence)

February 20-21 Winter Storm.  A potent storm system and a strong upper level system moved out of the Rockies and across Iowa and Illinois. Thunder snow was reported at many locations.  This storm system brought two-day snow totals of 10 to 15 inches across central and northeast Wisconsin.  Snow amounts included 13 inches in Appleton, 13.9 inches in Green Bay and 15.8 inches in Stevens Point.
March 22-23 Winter Storm.  A severe winter storm moved from the central plains to northern Illinois and produced a large swath of heavy snow. This storm system received plenty of moisture from the Gulf of Mexico.  In turn, heavy, wet snow and thunder was reported across much of north-central and northeast Wisconsin.  Snowfall totals exceeded a foot in many locations.  Some of the highest snowfall totals included 12.1 inches in Mosinee, 14.8 inches in Rhinelander, 17.8 in Green Bay and 18.8 inches in Shawano.  The 17.8 inches of snow that fell in Green Bay was the most from a single storm in more than 120 years.  Click here for more information on this event.

April 10 Tornado Outbreak.  An outbreak of severe thunderstorms and tornadoes, including a strong EF3 twister near Merrill, tore across central and northeast Wisconsin during the evening of April 10.  Fifteen tornadoes were confirmed in Wisconsin, most across the central and northeast part of the state.  (Ten of the fifteen twisters touched down across the NWS Green Bay service area.)  The hardest hit areas included Waushara, Winnebago and southeast Outagamie counties in east central Wisconsin, southern Lincoln County in north-central Wisconsin and Forest County across northern Wisconsin.  The ten tornadoes on April 10 is the largest outbreak ever recorded in the NWS Green Bay service area.  Click here for more information on this event.

April 19 Heavy Snow.  Just a week and a half after the record tornado outbreak, a late season winter storm brought heavy snow and thunder snow to much of central and northeast Wisconsin.  Snowfall totals ranged from 6 to 10 inches, with much of the snow falling in a six-hour period.  Green Bay recorded 10.1 inches, the highest amount ever recorded so late in the season.

Snowy 2010-11 Winter in Green Bay.  The winter of  2010-11 will go down in the record books in many ways for Green Bay.  It brought for the first time, four 10-inch plus snowfall events along with four separate thunder snow events.  The total snowfall for the season was 92.6 inches, which is the third highest since record keeping began in Green Bay in the 1880s and the most in modern history (post 1900).

July 19 Severe Storm and Flooding.  A nearly stationary front across central Wisconsin produced thunderstorms with high winds and torrential rainfall.  Three to five inches of rain fell in only a couple hours.  The heavy rain in the Stevens Point area caused flooding on the UW Stevens Point campus and at St. Michael's Hospital.  The thunderstorms produced 1.22 inches of rainfall in just 20 minutes in Plover and 3.09 inches at the Marshfield airport in a 1 hour period.  In addition to the flooding, thunderstorm winds near 75 mph caused significant damage in Stevens Point.

August 19 Killer Tornado.  A severe thunderstorm produced an EF1 tornado in Marinette County near Wausaukee late in the afternoon of August 19.  The twister flattened a mobile home, killing the occupant.  Hundreds of trees were snapped or uprooted along the nearly eight mile long storm path.  (This was the first death from a tornado in the NWS Green Bay service area since August 29, 1992 when a tornado demolished a mobile home just south of Wautoma, killing the occupant.)  Click here for more information on this event.

September 2 Severe Storms.  A small cluster of intense thunderstorms produced wind gusts over 70 mph and widespread damage across central and east-central Wisconsin during the morning of September 2.  Thousands of trees and power lines were blow down by the thunderstorm winds.  Power was knocked out to over 60,000 people at the height of the storm.  Peak wind gusts from the storms reached 72 mph in Appleton, 74 mph in Oshkosh and 81 mph in Sherwood.  Click here for more information on this event.

September 29 High Winds.  High winds developed across northeast Wisconsin during the evening hours as an area of low pressure intensified and moved rapidly northeast across the state.  Door County was the hardest hit with more than 12,000 customers left without power and many trees snapped and uprooted.  Several boats were damaged or destroyed by the wind and wave action on the waters of Green Bay.  The Department of Natural Resources closed state parks in the county for several days during the cleanup.  The highest wind gusts from the storm included 60 mph at the Algoma marina, 64 mph at North Port Pier and 69 mph at Sister Bay.

One of the Wettest Years Ever in Green Bay.  Green Bay is moving in on the all-time precipitation record for a single year.  As of December 25, 37.84 inches of precipitation had fallen.  This is the third wettest year in weather history.  The all-time record for a single year is 38.36 inches back in 1985.


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