COSTLIEST TWISTERS IN WISCONSIN
(1844 - 2005)
DATE COUNTY(IES) DAMAGE CODE DAMAGE AMOUNT (Property/Crop) (Known) 7/18/1996 Fond Du Lac (Oakfield) $40.4 mil 6/7-8/1984 Iowa-Dane (Barneveld) 7/6 $40.0 mil 8/18/2005 Dane (Stoughton) 7/6 $34.3 mil 6/17/1992 Dane (Belleville/McFarland) 7/6 $18.0 mil 4/27/1984 Oneida-Vilas 7/0 $15.8 mil 4/04/1981 Washington (West Bend) 7/0 $12.9 mil 8/29/1992 Waushara 7/5 >$10.0 mil 8/23/1998 Door County $6.5 mil 8/12/1985 Wood 7/6 $6.2 mil 6/05/1977 Fond Du Lac-Dodge-Waukesha 7/- >$6.0 mil 7/30/1977 Chippewa 7/- $6.0 mil 6/08/1985 Price-Oneida 7/6 $6.0 mil 3/27/1991 Green-Rock-Dane-Jefferson 7/0 >$5.0 mil The following are tornadoes that had codes but no given dollar amount: 6/04/1958 St. Croix-Dunn 7/4 $5 mil-$50 mil 9/09/1884 St.Croix-Barron-Polk 6/1 $500,000-$5 mil 6/12/1899 St. Croix (New Richmond) 6/1 $500,000-$5 mil
This is a preliminary listing of the costliest twisters in Wisconsin history. The data was compiled by NWS Meteorologist Bob McMahon from the StormData publication and from the Wisconsin Tornado Database compiled by Geographic Techniques in Madison, Wi.
Prior to August 1994, the damage statistics for each event were given a numerical code that was associated with a range of monetary damages. These ranges were rather broad, ie. 6 is the code for damage that ranged from $500,000 to $4,999,999! Included in this summary are those events that rated a 7 on the damage scale, or tied or exceeded 6 million dollars.
Also, these ranges are not normalized to a particular year's value of the American dollar. Clearly this makes the Barneveld Tornado of 1984 the most expensive twister to track across Wisconsin. Additionally, the St.Croix/Polk tornado of 1884 and the New Richmond Tornado of June 12, 1899 were included based on the assumption that the extensive damage would be quite costly if they occured in the 20th century. Even though the New Richmond Tornado only rated a 6 on the scale, over 3000 buildings were damaged or destroyed. This event would obviously rank higher in the damage value standings when viewed in current dollars.