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Tornado in Brown County, Wisconsin
30 tornadoes events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Tornado.
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. Storm records through 30 Jun 2026.
NCEI records 30 tornado events in Brown County, Wisconsin, between 1950 and 2026, spread over 18 years.
August is the busiest month, with 10 of the recorded events. The last 20 years account for 10 events against 5 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.6% of the 1,820 tornado events recorded in Wisconsin; its 5.7 per 100 square miles compares with 3.4 statewide.
By rating: 11 at (E)F0, 12 at (E)F1, 4 at (E)F2, 0 at (E)F3, 0 at (E)F4, 0 at (E)F5 and 3 unrated. Tornadoes before 2007 carry the original Fujita rating.
Compared with Wisconsin
| Measure | Brown County | Wisconsin | US |
|---|---|---|---|
| Tornado events since 1950 | 30 | 1,820 | 81,281 |
| Per 100 square miles | 5.7 | 3.4 | 2.3 |
| Per 10,000 residents | 1.1 | 3.1 | 2.4 |
| Deaths recorded | 0 | 98 | 6,410 |
| Busiest month | August | June | May |
By year
Seasonality
0Feb
0Mar
0Apr
4May
6Jun
6Jul
3Aug
10Sep
1Oct
0Nov
0Dec
0
Magnitude distribution
Enhanced Fujita scale wind estimates
- EF0/F0
- 65–85 mph (EF0)
- EF1/F1
- 86–110 mph (EF1)
- EF2/F2
- 111–135 mph (EF2)
- EF3/F3
- 136–165 mph (EF3)
- EF4/F4
- 166–200 mph (EF4)
- EF5/F5
- over 200 mph (EF5)
- Unrated
- no rating recorded
Tornado rating as recorded (Fujita scale before February 2007, Enhanced Fujita after).
Recorded events
All 30 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 11 Aug 2021 | Tornado | EF0 | — | — | — | — | County |
| 7 Aug 2019 | Tornado | EF0 | $50K | — | — | — | County |
| 14 Jun 2017 | Tornado | EF0 | — | — | — | — | County |
| 15 Jun 2015 | Tornado | EF0 | $100 | — | — | — | County |
| 6 Aug 2013 | Tornado | EF1 | — | — | — | — | County |
| 6 Aug 2013 | Tornado | EF1 | — | — | — | — | County |
| 6 Aug 2013 | Tornado | EF0 | $2.0M | — | — | — | County |
| 6 Aug 2013 | Tornado | EF1 | $500K | — | — | — | County |
| 10 Apr 2011 | Tornado | EF1 | $15K | — | — | — | County |
| 20 Aug 2010 | Tornado | EF1 | $100K | — | — | — | County |
| 13 Sep 2005 | Tornado | F0 | $5K | — | — | — | County |
| 18 Aug 2005 | Tornado | F1 | $10K | — | — | — | County |
| 23 Jun 2004 | Tornado | F0 | — | — | — | — | County |
| 17 Jun 1992 | Tornado | F0 | — | — | — | — | County |
| 16 May 1992 | Tornado | F1 | $250K | — | — | — | County |
| 9 Aug 1979 | Tornado | F1 | $250K | — | — | — | County |
| 30 Jul 1977 | Tornado | F1 | $250K | — | — | — | County |
| 30 Jul 1970 | Tornado | — | — | — | — | — | County |
| 21 May 1970 | Tornado | F0 | — | — | — | — | County |
| 22 Apr 1970 | Tornado | F1 | $250K | — | — | — | County |
| 22 Apr 1970 | Tornado | F2 | $250K | — | — | 2 | County |
| 22 Apr 1970 | Tornado | F2 | $250K | — | — | 1 | County |
| 16 Aug 1968 | Tornado | F2 | $25K | — | — | 1 | County |
| 30 May 1964 | Tornado | F0 | — | — | — | — | County |
| 23 Jun 1962 | Tornado | — | — | — | — | — | County |
| 11 Jun 1959 | Tornado | F1 | — | — | — | — | County |
| 28 May 1959 | Tornado | F0 | — | — | — | — | County |
| 28 May 1959 | Tornado | — | — | — | — | — | County |
| 10 May 1959 | Tornado | F2 | $2.5M | — | — | 3 | County |
| 11 Jul 1957 | Tornado | F1 | $3K | — | — | — | County |
Questions and answers
How many tornado events has Brown County had?
30 events in the NCEI Storm Events record between 1950 and 2026. Reporting of tornadoes became far more complete after 1996, so early decades undercount.
When was the last recorded tornado event in Brown County?
11 Aug 2021 (Tornado, EF0). Records reach NCEI about 120 days after the month ends.
What was the most damaging tornado event recorded in Brown County?
The tornado of 10 May 1959, with property damage estimated by NCEI at $2.5M.
How does Brown County compare with Wisconsin for tornado?
5.7 events per 100 square miles against 3.4 statewide; the county holds 30 of the state's 1,820 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Tornado hub and the county page.