Jefferson County weather alerts
There are no active weather alerts for Jefferson County, MO right now.
Since 2016 the National Weather Service has issued about 986 alerts that included Jefferson County, roughly 99 a year. The most common is the severe thunderstorm warning (215 from 2016 to 2025). The last tornado warning was issued on April 27, 2026. 44 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 Jefferson County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Washington County, Franklin County, Monroe County, St. Louis County.
Jefferson County alert history
Alert events that included Jefferson County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 215 | 10 | September 21, 2026 |
| Flood Warning | 159 | 12 | July 12, 2026 |
| Severe Thunderstorm Watch | 74 | 8 | July 10, 2026 |
| Dense Fog Advisory | 63 | 4 | May 9, 2026 |
| Winter Weather Advisory | 62 | 0 | December 1, 2025 |
| Flood Advisory | 51 | 6 | September 10, 2026 |
| Flood Watch | 46 | 7 | August 6, 2026 |
| Wind Advisory | 39 | 3 | June 17, 2026 |
| Tornado Watch | 39 | 5 | June 17, 2026 |
| Heat Advisory | 38 | 5 | September 15, 2026 |
| Flash Flood Warning | 37 | 2 | June 8, 2026 |
| Tornado Warning | 30 | 1 | April 27, 2026 |
| Freeze Warning | 29 | 2 | November 7, 2026 |
| Frost Advisory | 19 | 1 | October 18, 2026 |
| Red Flag Warning | 16 | 0 | March 21, 2025 |
| Extreme Heat Warning | 13 | 4 | September 3, 2026 |
| Winter Storm Warning | 11 | 1 | January 24, 2026 |
| Winter Storm Watch | 11 | 1 | January 24, 2026 |
| Freeze Watch | 9 | 0 | November 2, 2025 |
| Cold Weather Advisory | 9 | 2 | January 26, 2026 |
| Extreme Heat Watch | 5 | 3 | August 9, 2026 |
| High Wind Warning | 3 | 0 | March 5, 2025 |
| Extreme Cold Watch | 2 | 0 | December 22, 2022 |
| Fire Weather Watch | 2 | 0 | October 17, 2020 |
| Extreme Cold Warning | 2 | 1 | January 26, 2026 |
| Ice Storm Warning | 1 | 0 | January 13, 2017 |
| High Wind Watch | 1 | 0 | March 14, 2019 |
Tornado history in Jefferson County
44 tornadoes have been recorded in Jefferson County since 1950, killing 2 people and injuring 10. That ranks 12 of 115 counties in Missouri. The most recent was on June 7, 2025 (rated EF1).
Strongest tornadoes in Jefferson County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 22, 1981 | F3 | Jefferson County | 7.1 mi | 100 yd | 1 | 0 |
| December 31, 2010 | EF3 | Jefferson County | 6.7 mi | 440 yd | 1 | 6 |
| March 14, 2025 | EF2 | Jefferson County | 25.3 mi | 850 yd | 0 | 0 |
| December 31, 2010 | EF2 | Franklin County | 12.2 mi | 370 yd | 0 | 0 |
| May 18, 1995 | F2 | Jefferson County | 7.2 mi | 150 yd | 0 | 3 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 7, 2025 | EF1 | Jefferson County | 4.9 mi | 300 yd | 0 | 0 |
| May 19, 2025 | ? | Jefferson County | 2.4 mi | 1 yd | 0 | 0 |
| March 14, 2025 | EF2 | Jefferson County | 25.3 mi | 850 yd | 0 | 0 |
| July 16, 2024 | EF0 | Jefferson County | 2 mi | 25 yd | 0 | 0 |
| May 26, 2024 | EF0 | Jefferson County | 0.2 mi | 100 yd | 0 | 0 |
About Jefferson County
- Population: 231,888 (2024 estimate)
- State: Missouri
- NOAA Weather Radio SAME code: 029099 (how to use it)