Cass County weather alerts
There are no active weather alerts for Cass County, IL right now.
Since 2016 the National Weather Service has issued about 766 alerts that included Cass County, roughly 77 a year. The most common is the severe thunderstorm warning (118 from 2016 to 2025). The last tornado warning was issued on June 11, 2026. 20 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 Cass County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Mason County, Morgan County, Schuyler County, Brown County.
Cass County alert history
Alert events that included Cass County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 118 | 25 | August 15, 2026 |
| Dense Fog Advisory | 97 | 5 | September 11, 2026 |
| Flood Warning | 81 | 7 | August 18, 2026 |
| Winter Weather Advisory | 64 | 1 | March 16, 2026 |
| Wind Advisory | 63 | 6 | June 17, 2026 |
| Severe Thunderstorm Watch | 59 | 5 | July 20, 2026 |
| Heat Advisory | 36 | 9 | August 31, 2026 |
| Flood Watch | 35 | 5 | June 21, 2026 |
| Tornado Watch | 34 | 10 | June 17, 2026 |
| Cold Weather Advisory | 25 | 3 | January 26, 2026 |
| Freeze Warning | 24 | 0 | October 24, 2025 |
| Tornado Warning | 19 | 2 | June 11, 2026 |
| Frost Advisory | 17 | 3 | October 17, 2026 |
| Flash Flood Warning | 13 | 3 | August 14, 2026 |
| Freeze Watch | 12 | 0 | October 24, 2025 |
| Winter Storm Watch | 12 | 0 | November 29, 2025 |
| Flood Advisory | 11 | 2 | June 13, 2026 |
| Extreme Heat Warning | 8 | 3 | September 2, 2026 |
| Winter Storm Warning | 8 | 1 | January 24, 2026 |
| Red Flag Warning | 7 | 1 | February 27, 2026 |
| Extreme Heat Watch | 6 | 0 | July 23, 2025 |
| Extreme Cold Warning | 5 | 0 | January 14, 2024 |
| Fire Weather Watch | 4 | 1 | February 27, 2026 |
| High Wind Watch | 2 | 0 | November 27, 2019 |
| High Wind Warning | 2 | 0 | December 16, 2021 |
| Extreme Cold Watch | 2 | 0 | January 14, 2024 |
| Blizzard Warning | 1 | 0 | November 26, 2018 |
| Ice Storm Warning | 1 | 0 | January 1, 2021 |
Tornado history in Cass County
20 tornadoes have been recorded in Cass County since 1950, killing 1 people and injuring 7. That ranks 73 of 102 counties in Illinois. The most recent was on June 18, 2025 (rated unknown).
Strongest tornadoes in Cass County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 10, 1957 | F2 | Pike County | 42.3 mi | 10 yd | 0 | 0 |
| June 23, 1960 | F2 | Cass County | 34.9 mi | 100 yd | 0 | 1 |
| December 10, 2021 | EF2 | Cass County | 12.8 mi | 200 yd | 0 | 0 |
| July 27, 1973 | F2 | Cass County | 0.1 mi | 10 yd | 0 | 0 |
| April 8, 1999 | F1 | Morgan County | 9.3 mi | 333 yd | 1 | 6 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 18, 2025 | ? | Cass County | 3 mi | 10 yd | 0 | 0 |
| June 18, 2025 | ? | Cass County | 1.5 mi | 10 yd | 0 | 0 |
| December 10, 2021 | EF2 | Cass County | 12.8 mi | 200 yd | 0 | 0 |
| July 10, 2021 | ? | Cass County | 0.1 mi | 10 yd | 0 | 0 |
| July 10, 2021 | EF1 | Cass County | 2.4 mi | 75 yd | 0 | 0 |
About Cass County
- Population: 12,713 (2024 estimate)
- State: Illinois
- NOAA Weather Radio SAME code: 017017 (how to use it)