Thornton weather alerts
There are no active weather alerts for Thornton, CO right now.
The National Weather Service issues alerts for Thornton as part of Adams County.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
Map data: NWS, OpenFreeMap, OpenStreetMap
Tornado history within 25 miles of Thornton
238 tornadoes have been recorded within 25 miles of Thornton since 1950, killing 1 people and injuring 143. The most recent was on July 14, 2025 (rated unknown).
Strongest tornadoes within 25 miles of Thornton
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 22, 2008 | EF3 | Weld County | 38.7 mi | 1,760 yd | 1 | 78 |
| June 4, 2015 | EF3 | Boulder County | 6.7 mi | 440 yd | 0 | 0 |
| May 18, 1975 | F3 | Adams County | 4.1 mi | 440 yd | 0 | 0 |
| June 12, 1982 | F3 | Adams County | 3 mi | 400 yd | 0 | 0 |
| June 15, 1988 | F3 | Denver County | 2.5 mi | 200 yd | 0 | 7 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| July 14, 2025 | ? | Weld County | 0.2 mi | 10 yd | 0 | 0 |
| June 13, 2025 | ? | Adams County | 0.2 mi | 10 yd | 0 | 0 |
| June 20, 2024 | ? | Weld County | 0.1 mi | 20 yd | 0 | 0 |
| July 6, 2023 | ? | Adams County | 0 mi | 25 yd | 0 | 0 |
| July 6, 2023 | ? | Arapahoe County | 0 mi | 25 yd | 0 | 0 |
How often alerts are issued for Adams County
| Alert type | 2016–2025 | Last issued |
|---|---|---|
| Severe Thunderstorm Warning | 338 | September 25, 2026 |
| Flood Advisory | 93 | September 25, 2026 |
| Severe Thunderstorm Watch | 67 | September 21, 2026 |
| Tornado Warning | 34 | June 8, 2026 |
| Flash Flood Warning | 18 | August 27, 2026 |
| Tornado Watch | 13 | June 24, 2026 |
| Flood Warning | 9 | June 25, 2023 |
| Snow Squall Warning | 3 | February 27, 2024 |
| Dust Storm Warning | 1 | May 5, 2023 |
About Thornton
- Population: 146,689 (2024 estimate)
- County: Adams County
- State: Colorado