Dewey County weather alerts
There are no active weather alerts for Dewey County, SD right now.
Since 2016 the National Weather Service has issued about 1,090 alerts that included Dewey County, roughly 109 a year. The most common is the severe thunderstorm warning (313 from 2016 to 2025). The last tornado warning was issued on June 28, 2025. 28 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 Dewey County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Potter County, Walworth County, Corson County, Sully County.
Dewey County alert history
Alert events that included Dewey County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 313 | 34 | September 28, 2026 |
| Wind Advisory | 148 | 14 | November 2, 2026 |
| Severe Thunderstorm Watch | 91 | 11 | August 30, 2026 |
| Winter Weather Advisory | 82 | 7 | April 1, 2026 |
| Dense Fog Advisory | 68 | 10 | November 6, 2026 |
| Cold Weather Advisory | 60 | 2 | January 23, 2026 |
| Red Flag Warning | 53 | 9 | September 8, 2026 |
| Fire Weather Watch | 35 | 5 | July 13, 2026 |
| High Wind Warning | 34 | 4 | March 12, 2026 |
| Heat Advisory | 30 | 6 | August 2, 2026 |
| Winter Storm Watch | 25 | 2 | April 3, 2026 |
| High Wind Watch | 23 | 2 | March 12, 2026 |
| Extreme Cold Warning | 20 | 1 | January 23, 2026 |
| Winter Storm Warning | 19 | 2 | April 3, 2026 |
| Blizzard Warning | 13 | 0 | December 25, 2023 |
| Frost Advisory | 13 | 3 | May 20, 2026 |
| Freeze Warning | 12 | 1 | October 14, 2026 |
| Flood Warning | 12 | 1 | September 28, 2026 |
| Flash Flood Warning | 11 | 0 | July 22, 2025 |
| Tornado Watch | 7 | 2 | June 27, 2026 |
| Freeze Watch | 5 | 0 | October 7, 2023 |
| Tornado Warning | 5 | 0 | June 28, 2025 |
| Flood Watch | 4 | 1 | September 28, 2026 |
| Extreme Cold Watch | 3 | 1 | January 23, 2026 |
| Extreme Heat Warning | 2 | 2 | July 26, 2026 |
| Extreme Heat Watch | 1 | 0 | July 19, 2016 |
| Ice Storm Warning | 1 | 0 | December 25, 2023 |
Tornado history in Dewey County
28 tornadoes have been recorded in Dewey County since 1950, injuring 1 people. That ranks 33 of 66 counties in South Dakota. The most recent was on June 21, 2014 (rated EF0).
Strongest tornadoes in Dewey County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 2, 1953 | F2 | Dewey County | 5.9 mi | 10 yd | 0 | 0 |
| June 8, 1964 | F2 | Dewey County | 3.8 mi | 10 yd | 0 | 1 |
| June 16, 2010 | EF2 | Dewey County | 0.4 mi | 50 yd | 0 | 0 |
| April 19, 1955 | F2 | Dewey County | 0.1 mi | 30 yd | 0 | 0 |
| September 24, 1986 | F1 | Dewey County | 0.3 mi | 40 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 21, 2014 | EF0 | Dewey County | 0.3 mi | 20 yd | 0 | 0 |
| June 16, 2010 | EF2 | Dewey County | 0.4 mi | 50 yd | 0 | 0 |
| June 26, 2008 | EF0 | Dewey County | 0.2 mi | 50 yd | 0 | 0 |
| June 26, 2008 | EF0 | Dewey County | 0.3 mi | 50 yd | 0 | 0 |
| June 26, 2008 | EF0 | Dewey County | 1.2 mi | 100 yd | 0 | 0 |
About Dewey County
- Population: 5,322 (2024 estimate)
- State: South Dakota
- NOAA Weather Radio SAME code: 046041 (how to use it)