Hamilton County weather alerts
There are no active weather alerts for Hamilton County, IL right now.
Since 2016 the National Weather Service has issued about 772 alerts that included Hamilton County, roughly 77 a year. The most common is the severe thunderstorm warning (121 from 2016 to 2025). The last tornado warning was issued on June 22, 2026. 12 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 Hamilton County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Saline County, Jefferson County, Wayne County, Franklin County.
Hamilton County alert history
Alert events that included Hamilton County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 121 | 16 | August 22, 2026 |
| Dense Fog Advisory | 83 | 3 | October 15, 2026 |
| Severe Thunderstorm Watch | 65 | 8 | July 26, 2026 |
| Wind Advisory | 63 | 5 | June 17, 2026 |
| Flood Watch | 57 | 5 | July 9, 2026 |
| Flood Advisory | 51 | 5 | August 17, 2026 |
| Winter Weather Advisory | 49 | 0 | December 2, 2025 |
| Tornado Watch | 47 | 9 | June 22, 2026 |
| Freeze Warning | 35 | 3 | November 8, 2026 |
| Heat Advisory | 35 | 9 | September 15, 2026 |
| Flash Flood Warning | 34 | 0 | August 4, 2025 |
| Frost Advisory | 29 | 1 | October 18, 2026 |
| Freeze Watch | 16 | 1 | November 8, 2026 |
| Flood Warning | 14 | 0 | April 6, 2025 |
| Cold Weather Advisory | 14 | 2 | January 31, 2026 |
| Extreme Heat Warning | 12 | 5 | September 1, 2026 |
| Tornado Warning | 12 | 2 | June 22, 2026 |
| Winter Storm Warning | 11 | 1 | January 24, 2026 |
| Winter Storm Watch | 10 | 1 | January 24, 2026 |
| Red Flag Warning | 7 | 1 | March 29, 2026 |
| Extreme Heat Watch | 3 | 2 | September 1, 2026 |
| Fire Weather Watch | 1 | 0 | October 14, 2022 |
| Extreme Cold Watch | 1 | 0 | December 23, 2022 |
| Extreme Cold Warning | 1 | 1 | January 26, 2026 |
| High Wind Warning | 1 | 1 | March 15, 2026 |
Tornado history in Hamilton County
12 tornadoes have been recorded in Hamilton County since 1950, injuring 16 people. That ranks 94 of 102 counties in Illinois. The most recent was on March 19, 2020 (rated EF1).
Strongest tornadoes in Hamilton County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| December 18, 1957 | F3 | Hamilton County | 19.8 mi | 10 yd | 0 | 4 |
| April 19, 1996 | F3 | Jefferson County | 17 mi | 400 yd | 0 | 0 |
| December 18, 1957 | F3 | Hamilton County | 2.5 mi | 150 yd | 0 | 3 |
| January 7, 1989 | F2 | Hamilton County | 27 mi | 100 yd | 0 | 6 |
| February 9, 1960 | F2 | Franklin County | 24 mi | 77 yd | 0 | 1 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| March 19, 2020 | EF1 | Jefferson County | 2.9 mi | 300 yd | 0 | 0 |
| June 19, 2015 | EF0 | Hamilton County | 0.5 mi | 50 yd | 0 | 0 |
| April 19, 2011 | EF1 | Hamilton County | 3.4 mi | 150 yd | 0 | 0 |
| April 19, 1996 | F3 | Jefferson County | 17 mi | 400 yd | 0 | 0 |
| October 3, 1990 | F1 | Saline County | 3 mi | 50 yd | 0 | 0 |
About Hamilton County
- Population: 7,818 (2024 estimate)
- State: Illinois
- NOAA Weather Radio SAME code: 017065 (how to use it)