Jefferson County weather alerts
There are no active weather alerts for Jefferson County, CO right now.
Since 2016 the National Weather Service has issued about 238 alerts that included Jefferson County, roughly 24 a year. The most common is the severe thunderstorm warning (105 from 2016 to 2025). The last tornado warning was issued on May 10, 2023. 13 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 Arapahoe County, Douglas County, Broomfield County, Denver 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 | 105 | 12 | August 30, 2026 |
| Flood Advisory | 77 | 21 | September 25, 2026 |
| Severe Thunderstorm Watch | 31 | 3 | August 26, 2026 |
| Flash Flood Warning | 15 | 3 | August 14, 2026 |
| Tornado Warning | 4 | 0 | May 10, 2023 |
| Tornado Watch | 3 | 0 | June 29, 2023 |
| Snow Squall Warning | 3 | 0 | February 27, 2024 |
| Flood Warning | 0 | 1 | June 25, 2026 |
Tornado history in Jefferson County
13 tornadoes have been recorded in Jefferson County since 1950. That ranks 27 of 64 counties in Colorado. The most recent was on July 28, 1996 (rated F0).
Strongest tornadoes in Jefferson County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 3, 1981 | F2 | Jefferson County | 0.1 mi | 50 yd | 0 | 0 |
| June 30, 1982 | F1 | Jefferson County | 0.5 mi | 77 yd | 0 | 0 |
| July 9, 1982 | F1 | Jefferson County | 0.3 mi | 50 yd | 0 | 0 |
| July 9, 1982 | F1 | Jefferson County | 0.3 mi | 50 yd | 0 | 0 |
| June 20, 1987 | F1 | Jefferson County | 0.2 mi | 20 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| July 28, 1996 | F0 | Jefferson County | 0.1 mi | 50 yd | 0 | 0 |
| June 6, 1995 | F0 | Jefferson County | 0.1 mi | 10 yd | 0 | 0 |
| July 11, 1990 | F0 | Jefferson County | 0.1 mi | 10 yd | 0 | 0 |
| June 20, 1987 | F1 | Jefferson County | 0.2 mi | 20 yd | 0 | 0 |
| June 9, 1987 | F1 | Jefferson County | 0.1 mi | 20 yd | 0 | 0 |
About Jefferson County
- Population: 578,533 (2024 estimate)
- State: Colorado
- NOAA Weather Radio SAME code: 008059 (how to use it)
- Cities: Lakewood, Arvada, Westminster