Flood in Wisconsin
Every flood event the National Weather Service has filed in Wisconsin, year by year, with the most significant episodes. Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
The most significant on the map
The most significant flood episodes in Wisconsin.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The record
- Events
- 1,464
- Deaths
- 16
- Injuries
- 7
- Damage
- $713 million
Every year
The most significant
Ranked by deaths, injuries, damage and size together.
- Flood and Hail in Wisconsin, June 13, 2022A supercell thunderstorm formed north of a warm front and tracked east across much of southern WI. A swath of destructive hail and sporadic wind damage occurred. More specifically, vehicle, shingle, siding, gutter, and window screen damage.
- Flash Flooding and Flooding in Wisconsin, August 9 to 13, 2025A historic flash flood and record rainfall occurred over portions of the Milwaukee Metropolitan Area and Southeast WI resulting in damages in the $100s Millions.
- Tornado and Flash Flooding in Wisconsin, July 11 to 14, 2016Thunderstorms brought heavy rain to northwest Wisconsin early Monday, July 11th which helped to saturate the soil. During the day a strong low level jet pumped very moist air into the region.
- Flash Flooding and Flooding in Wisconsin, September 21 to 29, 2016One person was killed near Victory (Vernon County) when a house was swept down a hillside by a mudslide during the early morning hours of the 22nd.
- Flood and Damaging Wind in Wisconsin, June 20, 2012Three people were killed in two separate accidents when they unknowingly drove their vehicles into a 12 to 15 foot deep washout area. The washout occurred southwest of Willard (Clark County) on County Highway M where it crossed Scott Creek.
- Flash Flooding and Flooding in Wisconsin, June 16 to 18, 2018Multiple rounds of thunderstorms along a stationary boundary starting Friday, June 15th, and persisting through the day June 16th, acted to saturate soils across northwest Wisconsin. Another round of training storms developed the night of the 16th, fed by a moist low-level jet.
- Flash Flooding and Flooding in Wisconsin, August 18 to 31, 2007A warm front lifting northward into Iowa triggered round after round of thunderstorms leading to excessive rainfall across southwest Wisconsin during the evening and overnight hours of August 18-19. Total rainfall amounts of 10 to 15 inches were common.
- Tornado and Flash Flooding in Wisconsin, August 20 to 31, 2018An organized and slow moving low pressure area within a very moist airmass resulted in 9 to 15 inches of rain and historic flash flooding from the west side of Madison to Mazomanie, and south to Belleville.
- Tornadoes and Flash Flooding in Wisconsin, April 14, 2026Numerous severe thunderstorms developed across southern Wisconsin during the afternoon and evening hours as a wave of low pressure moved across a stationary front over the region.
- Tornadoes and Flash Flood in Wisconsin, July 20, 2019For the second consecutive day, a line of powerful thunderstorms moved across portions of central and east-central Wisconsin. The worst damage occurred from Wood/Portage counties eastward into the Fox Valley and lakeshore.
- Tornado and Flash Flooding in Wisconsin, August 7 to 11, 2021Several rounds of storms moved across western Wisconsin during the afternoon of August 7th. One of these storms produced an EF3 tornado that started in Boscobel (Grant County) and traveled east/southeast before dissipating south of Blue River (Grant County).
- Tornadoes and Flash Flooding in Wisconsin, June 1, 2000One would be hard pressed to find another day like June 1, 2000 in terms of depth and range of severe, convective weather events across south-central and southeast Wisconsin.
- Tornadoes and Flooding in Wisconsin, June 16, 2014A line of severe thunderstorms developed during the late afternoon of June 16th across Minnesota and Iowa. As the storms rolled across western Wisconsin they produced sporadic wind damage and at least 2 tornadoes in Platteville (Grant County) where 5 injuries occurred.
- Tornadoes and Flooding in Wisconsin, April 10 to 14, 2011A cold front pushed east into Wisconsin during the late afternoon and evening hours of April 10th. Severe thunderstorms developed along the cold front and produced very large hail and three tornadoes over portions of western and central Wisconsin.
- Tornadoes and Flash Flooding in Wisconsin, June 22, 2024Severe thunderstorms developed across western Wisconsin and moved eastward across southern Wisconsin through the afternoon and evening hours on June 22nd due to passing low pressure and its approaching cold front.
- Tornadoes and Flash Flooding in Wisconsin, August 28 to 31, 2018A line of severe thunderstorms produced widespread wind damage and 18 brief tornadoes across mainly Marquette, Green Lake, Fond du Lac, northern Dodge, and Sheboygan Counties.
- Tornado and Flash Flood in Wisconsin, July 18 to 24, 2019Several rounds of thunderstorms moved across western Wisconsin during the late evening of July 18th into the early morning hours of July 19th. As the initial round of storms moved through, a brief tornado touched down northeast of Westby (Vernon County).
- Tornado and Flash Flooding in Wisconsin, August 27 to 31, 2018A line of severe thunderstorms moved across western Wisconsin during the evening of August 27th. A brief tornado touched down and had an intermittent damage path between Tomah and Wyeville (Monroe County). The damage was limited to trees and power poles.
- Tornado and Flash Flooding in Wisconsin, April 15 to 16, 2026An organized area of low pressure tracked along a stationary over the region and brought lines and clusters of strong thunderstorms and heavy rainfall to southern WI. Flash flooding occurred in spots from Rock County to the Milwaukee area.
- Flooding and Lakeshore Flood in Wisconsin, May 17 to 26, 2020A slow moving low pressure area brought a 18-24 hour period of moderate to sometimes heavy rainfall. 3 to 6 inches of rain fell over far eastern WI, which resulted in river, creek, and lowland flooding. Numerous roads were flooded and closed.
- Flooding in Wisconsin, June 1 to 30, 2004Scattered to widespread heavy rains across south-central and southeast Wisconsin during the period of June 9-12, 2004 kept many rivers and streams at or above flood stage for a good part, or most of the month.
- Tornadoes and Flash Flooding in Wisconsin, April 17, 2026A round of severe thunderstorms and flash flooding occurred as a strong cold front approached and tracked across southern WI. More specifically, supercell thunderstorms developed from northeast IA into southwest WI and far southern WI during the late afternoon and evening hours.
- Flash Flooding and Flooding in Wisconsin, June 7 to 17, 2008A warm front extended west to east across the Upper Mississippi River Valley on June 7, which provided the focus for thunderstorms producing excessive rainfall and other severe weather.
- Flash Flooding and Flooding in Wisconsin, September 22 to 30, 2010A stationary front set up across central Wisconsin on the evening of September 22nd. As an unusually moist air mass flowed over this boundary, heavy rain developed and fell repeatedly across the area during the evening and overnight hours.
- Flash Flooding and Flooding in Wisconsin, July 19 to 27, 2017After a round of severe thunderstorms moved across western Wisconsin, a second round of thunderstorms developed over much of the same area during the late evening of July 19th into the early morning of the 20th.
More
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.