Johnson County weather alerts
There are no active weather alerts for Johnson County, TN right now.
Since 2016 the National Weather Service has issued about 789 alerts that included Johnson County, roughly 79 a year. The most common is the wind advisory (162 from 2016 to 2025). The last tornado warning was issued on July 28, 2026. 3 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 Johnson County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Washington County, Watauga County, Carter County, Ashe County.
Johnson County alert history
Alert events that included Johnson County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Wind Advisory | 162 | 7 | November 3, 2026 |
| Flood Advisory | 82 | 18 | September 21, 2026 |
| Winter Weather Advisory | 77 | 6 | November 13, 2026 |
| Severe Thunderstorm Warning | 76 | 10 | August 17, 2026 |
| High Wind Warning | 52 | 2 | October 10, 2026 |
| Dense Fog Advisory | 40 | 4 | November 6, 2026 |
| High Wind Watch | 39 | 2 | October 10, 2026 |
| Flood Watch | 31 | 7 | August 12, 2026 |
| Freeze Warning | 31 | 1 | May 3, 2026 |
| Cold Weather Advisory | 25 | 4 | February 7, 2026 |
| Winter Storm Warning | 25 | 2 | January 30, 2026 |
| Frost Advisory | 22 | 0 | April 23, 2024 |
| Flood Warning | 22 | 0 | August 13, 2025 |
| Flash Flood Warning | 21 | 2 | August 17, 2026 |
| Winter Storm Watch | 21 | 2 | January 30, 2026 |
| Severe Thunderstorm Watch | 19 | 4 | August 17, 2026 |
| Freeze Watch | 18 | 0 | November 1, 2023 |
| Red Flag Warning | 10 | 0 | March 26, 2025 |
| Tornado Watch | 5 | 0 | May 17, 2025 |
| Extreme Cold Watch | 4 | 2 | January 31, 2026 |
| Tornado Warning | 3 | 1 | July 28, 2026 |
| Extreme Cold Warning | 3 | 1 | January 31, 2026 |
| Fire Weather Watch | 1 | 0 | November 20, 2023 |
| Heat Advisory | 0 | 1 | June 30, 2026 |
Tornado history in Johnson County
3 tornadoes have been recorded in Johnson County since 1950, killing 2 people and injuring 3. That ranks 85 of 95 counties in Tennessee. The most recent was on May 12, 2017 (rated EF0).
Strongest tornadoes in Johnson County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 27, 2011 | EF2 | Johnson County | 12 mi | 250 yd | 2 | 0 |
| June 3, 1998 | F1 | Carter County | 9.5 mi | 80 yd | 0 | 3 |
| May 12, 2017 | EF0 | Johnson County | 0.1 mi | 40 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 12, 2017 | EF0 | Johnson County | 0.1 mi | 40 yd | 0 | 0 |
| April 27, 2011 | EF2 | Johnson County | 12 mi | 250 yd | 2 | 0 |
| June 3, 1998 | F1 | Carter County | 9.5 mi | 80 yd | 0 | 3 |
About Johnson County
- Population: 18,506 (2024 estimate)
- State: Tennessee
- NOAA Weather Radio SAME code: 047091 (how to use it)