Wisconsin, 2020
The year's recorded storm events, federal disaster declarations and flood insurance claims.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders.
Events by hazard
Includes events recorded by forecast zone. The state's yearly total for 2020 was 966 against 1,571 in 2019.
Counties with the most recorded events
Notable events
| Date | County | Event type | Magnitude | Property damage | Deaths | Injuries |
|---|---|---|---|---|---|---|
| 24 Jan 2020 | Jefferson | Winter Weather | — | — | 2 | 1 |
| 9 Feb 2020 | Racine | Winter Weather | — | — | 1 | 9 |
| 9 Feb 2020 | Outagamie | Heavy Snow | — | $30,000 | 1 | 1 |
| 29 Jun 2020 | St. Croix | Flash Flood | — | $8,000,000 | 1 | — |
| 17 May 2020 | Ozaukee | Flood | — | $30,000 | 1 | — |
| 8 Apr 2020 | Grant | Dense Fog | — | $20,000 | 1 | — |
| 26 Jul 2020 | Vernon | Heavy Rain | — | $20,000 | 1 | — |
| 5 Mar 2020 | Clark | Winter Weather | — | $10,000 | 1 | — |
| 6 May 2020 | Adams | Wildfire | — | $3,000 | 1 | — |
| 20 Apr 2020 | Trempealeau | Wildfire | — | — | 1 | — |
| 11 Feb 2020 | Milwaukee | Cold/Wind Chill | — | — | 1 | — |
| 14 Feb 2020 | Milwaukee | Cold/Wind Chill | — | — | 1 | — |
| 17 Feb 2020 | Milwaukee | Cold/Wind Chill | — | — | 1 | — |
| 24 Nov 2020 | Jefferson | Winter Weather | — | — | 1 | — |
| 2 Jun 2020 | Winnebago | Thunderstorm Wind | 58 mph | — | 1 | — |
| 11 Dec 2020 | Dodge | Winter Weather | — | — | 1 | — |
| 24 Dec 2020 | Adams | Cold/Wind Chill | — | — | 1 | — |
| 2 Jun 2020 | La Crosse | Hail | 2.50 in | $45,500,000 | — | — |
| 17 May 2020 | Ozaukee | Lakeshore Flood | — | — | — | 2 |
| 11 Jan 2020 | Milwaukee | Lakeshore Flood | — | $10,700,000 | — | — |
| 11 Jan 2020 | Racine | Lakeshore Flood | — | $4,000,000 | — | — |
| 11 Jan 2020 | Kenosha | Lakeshore Flood | — | $3,300,000 | — | — |
| 2 Jun 2020 | La Crosse | Hail | 2.50 in | $2,100,000 | — | — |
| 28 Aug 2020 | Juneau | Flash Flood | — | $330,000 | — | — |
| 28 Apr 2020 | Brown | Lakeshore Flood | — | $450,000 | — | — |
| 7 Jul 2020 | Manitowoc | Lightning | — | $400,000 | — | — |
| 26 Jul 2020 | Langlade | Flash Flood | — | $318,500 | — | — |
| 25 Jul 2020 | Oneida | Lightning | — | $306,000 | — | — |
| 3 May 2020 | Portage | Dust Storm | — | $300,000 | — | — |
| 10 Aug 2020 | Kenosha | Tornado | EF1 | $250,000 | — | — |
| 28 Aug 2020 | Monroe | Flash Flood | — | $160,000 | — | — |
| 28 Mar 2020 | Grant | Tornado | EF1 | $180,000 | — | — |
| 18 Jul 2020 | Trempealeau | Tornado | EF1 | $120,000 | — | — |
| 2 Jun 2020 | Buffalo | Hail | 1.75 in | $115,000 | — | — |
| 2 Jun 2020 | Jackson | Hail | 1.75 in | $105,000 | — | — |
| 28 Apr 2020 | Forecast zone | Lakeshore Flood | — | $100,000 | — | — |
| 27 Aug 2020 | Columbia | Flash Flood | — | $100,000 | — | — |
| 10 Nov 2020 | Walworth | Thunderstorm Wind | 75 mph | $100,000 | — | — |
| 1 Jan 2020 | Oconto | Flood | — | $96,000 | — | — |
| 9 Jan 2020 | Monroe | Winter Weather | — | $75,000 | — | — |
Up to 40 events with deaths, injuries, damage of $50,000 or more, or a tornado rating, ranked by deaths, injuries and damage.
Federal disaster declarations in 2020
| Declared | Number | Type | Incident | Title | Counties |
|---|---|---|---|---|---|
| 4 Apr 2020 | DR-4520 | Major disaster | Biological | Covid-19 Pandemic | 73 |
| 13 Mar 2020 | EM-3454 | Emergency | Biological | Covid-19 | 72 |
| 11 Mar 2020 | DR-4477 | Major disaster | Flood | Severe Winter Storm And Flooding | 3 |
Flood insurance claims with a 2020 date of loss
174 NFIP claims, 127 of them paid, for $3,269,748.
Sources: NOAA NCEI Storm Events through 30 Jun 2026; OpenFEMA DisasterDeclarationsSummaries v2 (29 Sep 2026); OpenFEMA NfipClaims v3 (8 Sep 2026). Built 30 Sep 2026.