Lyman County weather alerts
There are no active weather alerts for Lyman County, SD right now.
Since 2016 the National Weather Service has issued about 1,076 alerts that included Lyman County, roughly 108 a year. The most common is the severe thunderstorm warning (308 from 2016 to 2025). The last tornado warning was issued on June 20, 2022. 43 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 Lyman County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Hyde County, Buffalo County, Gregory County, Hughes County.
Lyman County alert history
Alert events that included Lyman County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 308 | 34 | September 4, 2026 |
| Wind Advisory | 126 | 13 | November 2, 2026 |
| Severe Thunderstorm Watch | 113 | 12 | August 24, 2026 |
| Winter Weather Advisory | 85 | 6 | April 3, 2026 |
| Heat Advisory | 64 | 5 | July 29, 2026 |
| Red Flag Warning | 55 | 13 | September 11, 2026 |
| Dense Fog Advisory | 52 | 9 | November 6, 2026 |
| Cold Weather Advisory | 36 | 4 | January 25, 2026 |
| High Wind Warning | 33 | 4 | March 12, 2026 |
| Fire Weather Watch | 30 | 6 | May 15, 2026 |
| Winter Storm Watch | 29 | 1 | March 14, 2026 |
| Winter Storm Warning | 24 | 0 | March 24, 2024 |
| Flood Warning | 22 | 3 | July 31, 2026 |
| High Wind Watch | 18 | 2 | March 12, 2026 |
| Blizzard Warning | 12 | 1 | March 15, 2026 |
| Flash Flood Warning | 11 | 1 | July 30, 2026 |
| Extreme Cold Warning | 11 | 0 | February 17, 2025 |
| Frost Advisory | 9 | 2 | October 14, 2026 |
| Freeze Warning | 9 | 0 | October 15, 2024 |
| Tornado Watch | 9 | 3 | June 27, 2026 |
| Freeze Watch | 4 | 0 | October 7, 2023 |
| Flood Watch | 4 | 0 | June 20, 2024 |
| Extreme Heat Warning | 3 | 1 | July 26, 2026 |
| Tornado Warning | 3 | 0 | June 20, 2022 |
| Extreme Heat Watch | 2 | 0 | June 20, 2025 |
| Extreme Cold Watch | 2 | 0 | December 22, 2022 |
| Flood Advisory | 1 | 0 | February 20, 2017 |
| Ice Storm Warning | 1 | 0 | November 10, 2022 |
Tornado history in Lyman County
43 tornadoes have been recorded in Lyman County since 1950, injuring 2 people. That ranks 14 of 66 counties in South Dakota. The most recent was on July 15, 2025 (rated EF0).
Strongest tornadoes in Lyman County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| July 9, 1971 | F3 | Lyman County | 0.1 mi | 10 yd | 0 | 0 |
| July 9, 1971 | F3 | Lyman County | 0.1 mi | 10 yd | 0 | 2 |
| July 25, 1960 | F2 | Lyman County | 10.4 mi | 10 yd | 0 | 0 |
| August 5, 1987 | F2 | Lyman County | 1.2 mi | 80 yd | 0 | 0 |
| June 4, 1971 | F2 | Lyman County | 0.1 mi | 10 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| July 15, 2025 | EF0 | Lyman County | 0 mi | 1 yd | 0 | 0 |
| June 12, 2022 | ? | Lyman County | 0.2 mi | 10 yd | 0 | 0 |
| August 9, 2019 | EF0 | Lyman County | 0.1 mi | 10 yd | 0 | 0 |
| May 8, 2011 | EF0 | Lyman County | 0.1 mi | 10 yd | 0 | 0 |
| July 23, 2010 | EF0 | Lyman County | 0.3 mi | 30 yd | 0 | 0 |
About Lyman County
- Population: 3,721 (2024 estimate)
- State: South Dakota
- NOAA Weather Radio SAME code: 046085 (how to use it)