Grundy County weather alerts
There are no active weather alerts for Grundy County, IA right now.
Since 2016 the National Weather Service has issued about 845 alerts that included Grundy County, roughly 85 a year. The most common is the severe thunderstorm warning (145 from 2016 to 2025). The last tornado warning was issued on July 20, 2026. 40 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 Grundy County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Black Hawk County, Marshall County, Hardin County, Butler County.
Grundy County alert history
Alert events that included Grundy County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 145 | 25 | September 4, 2026 |
| Winter Weather Advisory | 110 | 6 | March 16, 2026 |
| Dense Fog Advisory | 92 | 8 | September 17, 2026 |
| Wind Advisory | 82 | 3 | April 8, 2026 |
| Severe Thunderstorm Watch | 79 | 10 | August 18, 2026 |
| Cold Weather Advisory | 55 | 3 | January 26, 2026 |
| Flood Watch | 29 | 6 | September 30, 2026 |
| Heat Advisory | 29 | 2 | August 31, 2026 |
| Winter Storm Warning | 27 | 1 | February 19, 2026 |
| Tornado Watch | 26 | 5 | July 20, 2026 |
| Winter Storm Watch | 26 | 1 | March 15, 2026 |
| Freeze Warning | 22 | 2 | October 17, 2026 |
| Tornado Warning | 16 | 2 | July 20, 2026 |
| Frost Advisory | 14 | 1 | May 2, 2026 |
| Red Flag Warning | 14 | 2 | March 28, 2026 |
| Extreme Cold Warning | 12 | 1 | January 23, 2026 |
| High Wind Warning | 9 | 2 | March 15, 2026 |
| Flood Warning | 9 | 1 | October 1, 2026 |
| Flash Flood Warning | 8 | 2 | October 1, 2026 |
| Blizzard Warning | 7 | 2 | March 15, 2026 |
| Extreme Heat Watch | 6 | 2 | July 27, 2026 |
| Extreme Heat Warning | 5 | 2 | July 26, 2026 |
| Freeze Watch | 5 | 1 | October 17, 2026 |
| Extreme Cold Watch | 5 | 1 | January 23, 2026 |
| High Wind Watch | 4 | 2 | March 15, 2026 |
| Fire Weather Watch | 3 | 2 | March 28, 2026 |
| Ice Storm Warning | 3 | 0 | December 14, 2024 |
| Snow Squall Warning | 3 | 0 | December 28, 2025 |
Tornado history in Grundy County
40 tornadoes have been recorded in Grundy County since 1950, killing 10 people and injuring 78. That ranks 32 of 99 counties in Iowa. The most recent was on August 18, 2025 (rated unknown).
Strongest tornadoes in Grundy County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 25, 2008 | EF5 | Grundy County | 41 mi | 2,100 yd | 9 | 70 |
| May 30, 1989 | F4 | Hardin County | 11 mi | 200 yd | 0 | 3 |
| April 16, 1960 | F3 | Grundy County | 29.8 mi | 800 yd | 1 | 5 |
| March 22, 1991 | F2 | Hardin County | 20 mi | 50 yd | 0 | 0 |
| July 2, 1999 | F2 | Butler County | 8.5 mi | 50 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| August 18, 2025 | ? | Grundy County | 4.5 mi | 50 yd | 0 | 0 |
| August 18, 2025 | ? | Grundy County | 0.6 mi | 35 yd | 0 | 0 |
| August 18, 2025 | ? | Grundy County | 1.4 mi | 50 yd | 0 | 0 |
| March 31, 2023 | EF1 | Grundy County | 4.1 mi | 80 yd | 0 | 0 |
| March 31, 2023 | EF1 | Grundy County | 3.5 mi | 80 yd | 0 | 0 |
About Grundy County
- Population: 12,405 (2024 estimate)
- State: Iowa
- NOAA Weather Radio SAME code: 019075 (how to use it)