Mason County weather alerts
There are no active weather alerts for Mason County, IL right now.
Since 2016 the National Weather Service has issued about 845 alerts that included Mason County, roughly 85 a year. The most common is the severe thunderstorm warning (170 from 2016 to 2025). The last tornado warning was issued on June 11, 2026. 41 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 Mason County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Logan County, Tazewell County, Fulton County, Cass County.
Mason County alert history
Alert events that included Mason County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 170 | 53 | August 22, 2026 |
| Dense Fog Advisory | 100 | 9 | September 11, 2026 |
| Winter Weather Advisory | 67 | 2 | March 16, 2026 |
| Wind Advisory | 65 | 6 | June 17, 2026 |
| Severe Thunderstorm Watch | 62 | 6 | August 12, 2026 |
| Flood Warning | 60 | 5 | August 16, 2026 |
| Tornado Watch | 38 | 10 | June 17, 2026 |
| Flood Watch | 35 | 8 | August 19, 2026 |
| Heat Advisory | 31 | 8 | August 31, 2026 |
| Tornado Warning | 31 | 11 | June 11, 2026 |
| Cold Weather Advisory | 28 | 3 | January 26, 2026 |
| Freeze Warning | 27 | 1 | April 20, 2026 |
| Flash Flood Warning | 25 | 4 | August 15, 2026 |
| Flood Advisory | 17 | 1 | March 6, 2026 |
| Frost Advisory | 17 | 2 | October 17, 2026 |
| Winter Storm Watch | 13 | 0 | November 29, 2025 |
| Freeze Watch | 11 | 2 | April 20, 2026 |
| Extreme Heat Warning | 8 | 3 | September 2, 2026 |
| Winter Storm Warning | 8 | 0 | November 29, 2025 |
| Red Flag Warning | 7 | 2 | February 27, 2026 |
| Extreme Heat Watch | 6 | 0 | July 23, 2025 |
| Extreme Cold Warning | 5 | 0 | January 14, 2024 |
| High Wind Warning | 4 | 0 | November 5, 2022 |
| Fire Weather Watch | 4 | 1 | February 27, 2026 |
| High Wind Watch | 2 | 0 | November 27, 2019 |
| 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 Mason County
41 tornadoes have been recorded in Mason County since 1950, killing 1 people and injuring 60. That ranks 28 of 102 counties in Illinois. The most recent was on September 20, 2025 (rated EF0).
Strongest tornadoes in Mason County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| January 24, 1967 | F3 | Mason County | 5.1 mi | 80 yd | 1 | 3 |
| May 13, 1995 | F3 | Mason County | 25 mi | 880 yd | 0 | 25 |
| May 15, 1968 | F3 | Mason County | 12.6 mi | 600 yd | 0 | 25 |
| November 13, 1951 | F2 | Mason County | 47.4 mi | 50 yd | 0 | 0 |
| November 29, 1975 | F2 | Mason County | 18.6 mi | 10 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| September 20, 2025 | EF0 | Mason County | 2.4 mi | 40 yd | 0 | 0 |
| June 18, 2025 | EF0 | Mason County | 0.1 mi | 100 yd | 0 | 0 |
| August 1, 2022 | EF0 | Mason County | 0.4 mi | 60 yd | 0 | 0 |
| March 5, 2022 | EF0 | Mason County | 6.9 mi | 50 yd | 0 | 0 |
| March 23, 2021 | EF0 | Mason County | 2.1 mi | 30 yd | 0 | 0 |
About Mason County
- Population: 12,543 (2024 estimate)
- State: Illinois
- NOAA Weather Radio SAME code: 017125 (how to use it)