Lyon County weather alerts
There are no active weather alerts for Lyon County, IA right now.
Since 2016 the National Weather Service has issued about 1,042 alerts that included Lyon County, roughly 104 a year. The most common is the severe thunderstorm warning (165 from 2016 to 2025). The last tornado warning was issued on September 2, 2026. 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 Lyon County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Minnehaha County, Rock County, Nobles County, Osceola County.
Lyon County alert history
Alert events that included Lyon County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 165 | 30 | September 12, 2026 |
| Dense Fog Advisory | 119 | 7 | September 30, 2026 |
| Winter Weather Advisory | 107 | 4 | March 7, 2026 |
| Wind Advisory | 95 | 3 | June 17, 2026 |
| Flood Warning | 90 | 0 | June 24, 2024 |
| Severe Thunderstorm Watch | 70 | 13 | September 2, 2026 |
| Cold Weather Advisory | 53 | 3 | March 16, 2026 |
| Heat Advisory | 44 | 6 | July 27, 2026 |
| Red Flag Warning | 42 | 9 | May 14, 2026 |
| Winter Storm Watch | 37 | 1 | March 15, 2026 |
| Fire Weather Watch | 30 | 4 | April 16, 2026 |
| Flash Flood Warning | 29 | 1 | September 6, 2026 |
| Winter Storm Warning | 20 | 0 | December 6, 2025 |
| Frost Advisory | 16 | 4 | May 20, 2026 |
| Tornado Warning | 16 | 2 | September 2, 2026 |
| Flood Watch | 15 | 2 | September 6, 2026 |
| Freeze Warning | 15 | 2 | October 17, 2026 |
| Tornado Watch | 14 | 2 | June 10, 2026 |
| Blizzard Warning | 13 | 1 | March 15, 2026 |
| Extreme Heat Warning | 11 | 1 | July 25, 2026 |
| High Wind Warning | 11 | 3 | March 15, 2026 |
| Extreme Cold Warning | 11 | 1 | January 23, 2026 |
| Extreme Heat Watch | 8 | 0 | July 27, 2025 |
| Extreme Cold Watch | 4 | 1 | January 23, 2026 |
| Freeze Watch | 3 | 1 | October 17, 2026 |
| High Wind Watch | 2 | 1 | March 13, 2026 |
| Ice Storm Warning | 2 | 0 | December 13, 2022 |
Tornado history in Lyon County
43 tornadoes have been recorded in Lyon County since 1950, injuring 18 people. That ranks 27 of 99 counties in Iowa. The most recent was on July 28, 2025 (rated unknown).
Strongest tornadoes in Lyon County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 25, 2010 | EF4 | Lyon County | 13.7 mi | 800 yd | 0 | 13 |
| July 6, 1978 | F2 | Lyon County | 14.2 mi | 200 yd | 0 | 0 |
| May 1, 2008 | EF2 | Sioux County | 13 mi | 400 yd | 0 | 0 |
| June 7, 1993 | F2 | Lyon County | 10 mi | 127 yd | 0 | 5 |
| April 26, 1986 | F2 | Lyon County | 9.5 mi | 70 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| July 28, 2025 | ? | Lyon County | 0.2 mi | 50 yd | 0 | 0 |
| July 28, 2025 | EF1 | Lyon County | 2.1 mi | 250 yd | 0 | 0 |
| April 16, 2024 | EF1 | Lyon County | 1 mi | 75 yd | 0 | 0 |
| May 30, 2022 | EF0 | Lyon County | 0.5 mi | 60 yd | 0 | 0 |
| May 30, 2022 | EF1 | Lyon County | 1.9 mi | 100 yd | 0 | 0 |
About Lyon County
- Population: 12,378 (2024 estimate)
- State: Iowa
- NOAA Weather Radio SAME code: 019119 (how to use it)