Knox County weather alerts
There are no active weather alerts for Knox County, IL right now.
Since 2016 the National Weather Service has issued about 781 alerts that included Knox County, roughly 78 a year. The most common is the severe thunderstorm warning (145 from 2016 to 2025). The last tornado warning was issued on August 10, 2026. 33 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 Knox County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Henry County, Fulton County, Mercer County, Warren County.
Knox County alert history
Alert events that included Knox County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 145 | 26 | August 12, 2026 |
| Dense Fog Advisory | 97 | 6 | September 11, 2026 |
| Winter Weather Advisory | 76 | 2 | March 16, 2026 |
| Severe Thunderstorm Watch | 66 | 7 | August 21, 2026 |
| Wind Advisory | 66 | 5 | April 2, 2026 |
| Cold Weather Advisory | 38 | 3 | January 26, 2026 |
| Tornado Watch | 32 | 8 | June 17, 2026 |
| Flood Watch | 29 | 12 | September 17, 2026 |
| Flood Warning | 28 | 6 | October 2, 2026 |
| Heat Advisory | 27 | 5 | August 31, 2026 |
| Freeze Warning | 24 | 1 | April 20, 2026 |
| Flash Flood Warning | 19 | 6 | August 19, 2026 |
| Frost Advisory | 19 | 2 | October 17, 2026 |
| Tornado Warning | 19 | 7 | August 10, 2026 |
| Winter Storm Watch | 17 | 0 | November 29, 2025 |
| Winter Storm Warning | 14 | 0 | November 29, 2025 |
| Flood Advisory | 12 | 4 | August 12, 2026 |
| Freeze Watch | 10 | 1 | April 20, 2026 |
| Extreme Heat Warning | 9 | 3 | September 2, 2026 |
| Red Flag Warning | 9 | 2 | February 27, 2026 |
| Extreme Heat Watch | 6 | 0 | July 23, 2025 |
| Extreme Cold Warning | 6 | 1 | January 23, 2026 |
| High Wind Warning | 3 | 0 | December 16, 2021 |
| Fire Weather Watch | 3 | 2 | February 27, 2026 |
| High Wind Watch | 2 | 0 | November 27, 2019 |
| Ice Storm Warning | 2 | 0 | January 1, 2021 |
| Extreme Cold Watch | 2 | 1 | January 23, 2026 |
| Blizzard Warning | 1 | 1 | March 16, 2026 |
Tornado history in Knox County
33 tornadoes have been recorded in Knox County since 1950, injuring 7 people. That ranks 44 of 102 counties in Illinois. The most recent was on April 20, 2025 (rated EF1).
Strongest tornadoes in Knox County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 14, 1974 | F3 | Rock Island County | 48.6 mi | 440 yd | 0 | 2 |
| May 13, 1995 | F2 | Knox County | 14 mi | 880 yd | 0 | 2 |
| June 5, 2010 | EF2 | Knox County | 5.7 mi | 50 yd | 0 | 0 |
| March 23, 1975 | F2 | Knox County | 1 mi | 80 yd | 0 | 2 |
| March 4, 1976 | F2 | Knox County | 0.1 mi | 440 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 20, 2025 | EF1 | Knox County | 4.4 mi | 120 yd | 0 | 0 |
| April 20, 2025 | EF1 | Knox County | 16.5 mi | 150 yd | 0 | 0 |
| July 15, 2024 | EF1 | Knox County | 1.3 mi | 150 yd | 0 | 0 |
| June 18, 2021 | EF1 | Knox County | 10.3 mi | 250 yd | 0 | 0 |
| March 28, 2020 | ? | Knox County | 0.1 mi | 10 yd | 0 | 0 |
About Knox County
- Population: 48,716 (2024 estimate)
- State: Illinois
- NOAA Weather Radio SAME code: 017095 (how to use it)