Tornadoes in Walworth County
The Storm Prediction Center records 30 tornadoes whose paths touched Walworth County, South Dakota between 1955 and 2025. None of them is recorded as having killed anyone. The busiest month is June, with 14 tornadoes. The strongest was an EF4 on 22 May 2010. The most recent was on 14 September 2025.
- 30tornadoes
- 0deaths
- 2injuries
- 423per 10,000 sq mi of land
A tornado that crossed several counties counts in each one, so county counts add up to more than the state's.
How strong were the tornadoes in Walworth County?
| Rating | Tornadoes | Share |
|---|---|---|
| F0 / EF0 | 15 | 50% |
| F1 / EF1 | 8 | 27% |
| F2 / EF2 | 4 | 13% |
| F3 / EF3 | 2 | 7% |
| F4 / EF4 | 1 | 3% |
| F5 / EF5 | 0 | 0% |
| Unknown rating | 0 | 0% |
Walworth County tornadoes over time
The 2020s only run to 2025, so that bar is for a shorter period. The record starts in 1950.
Show the numbers
| Period | Count |
|---|---|
| 1950s | 3 |
| 1960s | 4 |
| 1970s | 5 |
| 1980s | 2 |
| 1990s | 4 |
| 2000s | 6 |
| 2010s | 5 |
| 2020s | 1 |
Show the numbers
| Period | Count |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 0 |
| Apr | 2 |
| May | 3 |
| Jun | 14 |
| Jul | 6 |
| Aug | 4 |
| Sep | 1 |
| Oct | 0 |
| Nov | 0 |
| Dec | 0 |
Records for Walworth County
- Strongest: Bowdle, South Dakota tornado22 May 2010, EF4, 5.7 miles long
- Longest path: South Dakota tornado18 June 1964, F2, 2 injuries, 24.6 miles long
- Most recent: South Dakota tornado14 September 2025, EF1, 4 miles long
Notable tornadoes in Walworth County
- Bowdle, South Dakota tornado22 May 2010, EF4, 5.7 miles long
Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.