Walworth County weather alerts
There are no active weather alerts for Walworth County, SD right now.
Since 2016 the National Weather Service has issued about 948 alerts that included Walworth County, roughly 95 a year. The most common is the severe thunderstorm warning (192 from 2016 to 2025). The last tornado warning was issued on September 14, 2025. 30 tornadoes have touched down in the county since 1950.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
No warnings, watches or advisories include Walworth County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Edmunds County, Potter County, Dewey County, Corson County.
Walworth County alert history
Alert events that included Walworth County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 192 | 25 | September 5, 2026 |
| Wind Advisory | 132 | 12 | October 24, 2026 |
| Severe Thunderstorm Watch | 94 | 10 | August 30, 2026 |
| Winter Weather Advisory | 94 | 10 | April 1, 2026 |
| Dense Fog Advisory | 86 | 16 | November 7, 2026 |
| Cold Weather Advisory | 71 | 4 | January 25, 2026 |
| Red Flag Warning | 41 | 7 | September 8, 2026 |
| High Wind Warning | 26 | 3 | March 12, 2026 |
| Winter Storm Watch | 26 | 2 | April 3, 2026 |
| Fire Weather Watch | 26 | 4 | May 15, 2026 |
| Extreme Cold Warning | 24 | 1 | January 23, 2026 |
| Heat Advisory | 23 | 5 | July 29, 2026 |
| Winter Storm Warning | 20 | 2 | April 3, 2026 |
| Blizzard Warning | 17 | 2 | March 15, 2026 |
| High Wind Watch | 17 | 2 | March 12, 2026 |
| Frost Advisory | 16 | 2 | May 19, 2026 |
| Freeze Warning | 13 | 2 | October 14, 2026 |
| Tornado Watch | 6 | 2 | June 27, 2026 |
| Freeze Watch | 5 | 0 | October 7, 2023 |
| Flood Warning | 5 | 1 | August 29, 2026 |
| Tornado Warning | 4 | 0 | September 14, 2025 |
| Extreme Cold Watch | 3 | 1 | January 23, 2026 |
| Extreme Heat Warning | 2 | 2 | July 26, 2026 |
| Flood Watch | 2 | 1 | July 8, 2026 |
| Extreme Heat Watch | 1 | 0 | July 19, 2016 |
| Ice Storm Warning | 1 | 0 | December 25, 2023 |
| Flash Flood Warning | 1 | 0 | July 22, 2025 |
Tornado history in Walworth County
30 tornadoes have been recorded in Walworth County since 1950, injuring 2 people. That ranks 29 of 66 counties in South Dakota. The most recent was on September 14, 2025 (rated EF1).
Strongest tornadoes in Walworth County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 22, 2010 | EF4 | Walworth County | 5.7 mi | 1,200 yd | 0 | 0 |
| June 20, 1968 | F3 | Walworth County | 8.8 mi | 200 yd | 0 | 0 |
| June 20, 1968 | F3 | Walworth County | 0.1 mi | 10 yd | 0 | 0 |
| June 18, 1964 | F2 | Potter County | 24.6 mi | 200 yd | 0 | 2 |
| April 19, 1955 | F2 | Potter County | 18.2 mi | 27 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| September 14, 2025 | EF1 | Walworth County | 4 mi | 200 yd | 0 | 0 |
| June 1, 2018 | EF0 | Walworth County | 0.1 mi | 10 yd | 0 | 0 |
| July 26, 2011 | EF0 | Walworth County | 0.4 mi | 10 yd | 0 | 0 |
| May 22, 2010 | EF4 | Walworth County | 5.7 mi | 1,200 yd | 0 | 0 |
| May 22, 2010 | EF1 | Walworth County | 0.5 mi | 100 yd | 0 | 0 |
About Walworth County
- Population: 5,270 (2024 estimate)
- State: South Dakota
- NOAA Weather Radio SAME code: 046129 (how to use it)