Alert archive / Colorado / Denver County
Weather alerts in Denver County, Colorado, 2026
167 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Denver County and its neighbors
Each county as a circle sized by its count in 2026. Tap one for its archive.
- Alerts
- 167
- Warnings
- 44
- Watches
- 28
- Advisories
- 24
- Busiest month
- August47 alerts
- Busiest day
- August 15, 202611 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Denver County, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 9 | 44% | 16 | 88% | 12 min |
| Flash flood warnings | 4 | 3 | 25% | 3 | 100% | 26 min |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 32 | 5 | 84% | 14 | 64% | 13 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 416 | 146 | 65% | 392 | 79% | 17 min |
| NWS Denver/Boulder, CO: flash flood warnings | 38 | 9 | 76% | 15 | 93% | 41 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 2, 12:07 PM MST | Fire Weather Watch | BOU | 39 hr |
| Jan 14, 1:47 PM MST | Red Flag Warning | BOU | 28 hr |
| Jan 15, 10:01 AM MST | Red Flag Warning | BOU | 32 hr |
| Jan 22, 1:58 AM MST | Cold Weather Advisory | BOU | 4 days |
| Jan 25, 1:02 PM MST | Winter Weather Advisory | BOU | 6 hr |
| Feb 13, 12:30 PM MST | Fire Weather Watch | BOU | 59 hr |
| Feb 13, 12:30 PM MST | Fire Weather Watch | BOU | 72 hr |
| Feb 16, 12:13 PM MST | Red Flag Warning | BOU | 31 hr |
| Feb 23, 11:59 AM MST | Red Flag Warning | BOU | 29 hr |
| Feb 24, 11:57 AM MST | Red Flag Warning | BOU | 30 hr |
| Feb 25, 1:00 AM MST | Fire Weather Watch | BOU | 26 hr |
| Feb 26, 3:16 AM MST | Fire Weather Watch | BOU | 8 hr |
| Feb 26, 11:04 AM MST | Red Flag Warning | BOU | 31 hr |
| Mar 4, 12:30 PM MST | Winter Weather Advisory | BOU | 58 hr |
| Mar 10, 2:26 AM MDT | Red Flag Warning | BOU | 11 hr |
| Mar 10, 1:06 PM MDT | Fire Weather Watch | BOU | 24 hr |
| Mar 11, 1:22 PM MDT | Red Flag Warning | BOU | 32 hr |
| Mar 11, 11:23 PM MDT | Fire Weather Watch | BOU | 13 hr |
| Mar 12, 12:50 PM MDT | Fire Weather Watch | BOU | 8 hr |
| Mar 12, 12:50 PM MDT | Red Flag Warning | BOU | 31 hr |
| Mar 12, 8:58 PM MDT | Red Flag Warning | BOU | 48 hr |
| Mar 13, 11:25 AM MDT | High Wind Watch | BOU | 27 hr |
| Mar 14, 2:27 PM MDT | High Wind Warning | BOU | 25 hr |
| Mar 15, 1:57 AM MDT | Special Weather Statement | BOU | 48 min |
| Mar 17, 1:09 PM MDT | Red Flag Warning | BOU | 30 hr |
| Mar 19, 2:16 AM MDT | Fire Weather Watch | BOU | 35 hr |
| Mar 20, 12:46 PM MDT | Red Flag Warning | BOU | 33 hr |
| Mar 29, 3:00 AM MDT | Fire Weather Watch | BOU | 9 hr |
| Mar 29, 12:19 PM MDT | Red Flag Warning | BOU | 32 hr |
| Apr 2, 12:57 PM MDT | Red Flag Warning | BOU | 30 hr |
| Apr 11, 5:41 PM MDT | Special Weather Statement | BOU | 34 min |
| Apr 15, 11:58 AM MDT | Freeze Watch | BOU | 23 hr |
| Apr 16, 11:02 AM MDT | Freeze Warning | BOU | 45 hr |
| Apr 20, 11:42 AM MDT | Fire Weather Watch | BOU | 9 hr |
| Apr 20, 8:48 PM MDT | Red Flag Warning | BOU | 51 hr |
| Apr 21, 1:15 PM MDT | Fire Weather Watch | BOU | 23 hr |
| Apr 22, 12:22 PM MDT | Red Flag Warning | BOU | 31 hr |
| Apr 22, 11:51 PM MDT | Fire Weather Watch | BOU | 14 hr |
| Apr 23, 1:41 PM MDT | Red Flag Warning | BOU | 30 hr |
| Apr 27, 7:25 AM MDT | Dense Fog Advisory | BOU | 3 hr |
| May 3, 1:43 PM MDT | Winter Storm Watch | BOU | 34 hr |
| May 4, 12:51 AM MDT | Winter Storm Warning | BOU | 61 hr |
| May 4, 12:59 PM MDT | Freeze Watch | BOU | 23 hr |
| May 5, 11:31 AM MDT | Freeze Warning | BOU | 44 hr |
| May 17, 11:53 AM MDT | Freeze Watch | BOU | 24 hr |
| May 17, 1:27 PM MDT | Special Weather Statement | BOU | 33 min |
| May 17, 1:55 PM MDT | Special Weather Statement | BOU | 50 min |
| May 17, 2:08 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| May 20, 9:14 AM MDT | Areal Flood Advisory | BOU | 8 hr |
| May 25, 2:08 PM MDT | Special Weather Statement | BOU | 52 min |
| May 25, 10:05 PM MDT | Special Weather Statement | BOU | 40 min |
| May 28, 6:15 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 29, 12:37 AM MDT | Special Weather Statement | BOU | 38 min |
| May 30, 5:20 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 1, 11:51 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 1, 12:52 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 1, 1:04 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Jun 1, 1:28 PM MDT | Severe Thunderstorm Warning | BOU | 47 min |
| Jun 1, 1:38 PM MDT | Severe Thunderstorm Warning | BOU | 52 min |
| Jun 1, 2:04 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Jun 1, 2:14 PM MDT | Flash Flood Warning | BOU | 95 min |
| Jun 1, 2:21 PM MDT | Severe Thunderstorm Warning | BOU | 39 min |
| Jun 3, 3:50 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jun 7, 12:32 PM MDT | Fire Weather Watch | BOU | 25 hr |
| Jun 7, 2:49 PM MDT | Special Weather Statement | BOU | 41 min |
| Jun 8, 1:03 PM MDT | Red Flag Warning | BOU | 32 hr |
| Jun 8, 1:29 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 8, 2:32 PM MDT | Tornado Watch | SPC | 6 hr |
| Jun 8, 3:14 PM MDT | Severe Thunderstorm Warning | BOU | 46 min |
| Jun 8, 3:37 PM MDT | Severe Thunderstorm Warning | BOU | 23 min |
| Jun 8, 3:51 PM MDT | Severe Thunderstorm Warning | BOU | 39 min |
| Jun 8, 4:19 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Jun 8, 4:20 PM MDT | Areal Flood Advisory | BOU | 115 min |
| Jun 9, 12:34 AM MDT | Fire Weather Watch | BOU | 24 hr |
| Jun 9, 12:57 PM MDT | Red Flag Warning | BOU | 31 hr |
| Jun 23, 1:57 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 23, 4:39 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 23, 10:52 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jun 24, 2:20 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jun 24, 6:47 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Jun 24, 10:01 PM MDT | Severe Thunderstorm Warning | BOU | 29 min |
| Jun 25, 2:24 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 26, 1:50 PM MDT | Special Weather Statement | BOU | 40 min |
| Jun 26, 2:37 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 2, 3:47 PM MDT | Special Weather Statement | BOU | 43 min |
| Jul 6, 3:51 PM MDT | Special Weather Statement | BOU | 39 min |
| Jul 8, 4:11 PM MDT | Special Weather Statement | BOU | 49 min |
| Jul 9, 2:59 PM MDT | Special Weather Statement | BOU | 31 min |
| Jul 9, 3:40 PM MDT | Special Weather Statement | BOU | 50 min |
| Jul 9, 3:45 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| Jul 10, 5:28 PM MDT | Special Weather Statement | BOU | 32 min |
| Jul 10, 5:45 PM MDT | Special Weather Statement | BOU | 30 min |
| Jul 12, 1:11 PM MDT | Heat Advisory | BOU | 32 hr |
| Jul 17, 12:00 PM MDT | Heat Advisory | BOU | 3 days |
| Jul 22, 2:19 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jul 22, 4:13 PM MDT | Severe Thunderstorm Warning | BOU | 32 min |
| Jul 24, 2:51 AM MDT | Heat Advisory | BOU | 42 hr |
| Jul 24, 2:51 AM MDT | Heat Advisory | BOU | 66 hr |
| Jul 28, 11:57 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 2:35 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 29, 2:48 PM MDT | Special Weather Statement | BOU | 27 min |
| Jul 29, 3:01 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Jul 30, 4:15 PM MDT | Special Weather Statement | BOU | 30 min |
| Jul 31, 2:15 AM MDT | Heat Advisory | BOU | 4 days |
| Jul 31, 6:30 PM MDT | Special Weather Statement | BOU | 30 min |
| Jul 31, 6:58 PM MDT | Special Weather Statement | BOU | 32 min |
| Aug 6, 12:07 PM MDT | Heat Advisory | BOU | 3 days |
| Aug 8, 3:20 PM MDT | Special Weather Statement | BOU | 40 min |
| Aug 8, 5:01 PM MDT | Special Weather Statement | BOU | 29 min |
| Aug 9, 6:27 AM MDT | Special Weather Statement | BOU | 33 min |
| Aug 9, 2:49 PM MDT | Special Weather Statement | BOU | 26 min |
| Aug 11, 4:59 PM MDT | Special Weather Statement | BOU | 31 min |
| Aug 13, 2:41 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 13, 2:53 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 13, 3:49 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 13, 4:21 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Aug 14, 2:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 14, 2:59 PM MDT | Special Weather Statement | BOU | 31 min |
| Aug 14, 3:09 PM MDT | Severe Thunderstorm Warning | BOU | 36 min |
| Aug 14, 3:30 PM MDT | Flash Flood Warning | BOU | 99 min |
| Aug 14, 3:43 PM MDT | Special Weather Statement | BOU | 32 min |
| Aug 14, 4:07 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 15, 1:06 AM MDT | Flood Watch | BOU | 19 hr |
| Aug 15, 1:26 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Aug 15, 1:26 PM MDT | Severe Thunderstorm Warning | BOU | 34 min |
| Aug 15, 1:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 2:08 PM MDT | Special Weather Statement | BOU | 37 min |
| Aug 15, 2:27 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Aug 15, 2:34 PM MDT | Severe Thunderstorm Warning | BOU | 24 min |
| Aug 15, 2:44 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Aug 15, 4:02 PM MDT | Areal Flood Advisory | BOU | 37 min |
| Aug 15, 4:39 PM MDT | Areal Flood Warning | BOU | 111 min |
| Aug 15, 5:08 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 16, 12:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Aug 16, 2:06 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 4:40 PM MDT | Special Weather Statement | BOU | 50 min |
| Aug 21, 5:08 PM MDT | Special Weather Statement | BOU | 52 min |
| Aug 22, 1:15 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 23, 4:28 PM MDT | Special Weather Statement | BOU | 47 min |
| Aug 24, 1:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Aug 26, 1:43 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 26, 3:53 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 26, 6:11 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Aug 26, 6:23 PM MDT | Special Weather Statement | BOU | 37 min |
| Aug 26, 6:37 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Aug 26, 6:40 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Aug 26, 7:16 PM MDT | Areal Flood Advisory | BOU | 119 min |
| Aug 27, 3:02 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Aug 28, 2:51 PM MDT | Special Weather Statement | BOU | 24 min |
| Aug 29, 3:07 PM MDT | Special Weather Statement | BOU | 23 min |
| Aug 30, 2:32 PM MDT | Special Weather Statement | BOU | 43 min |
| Sep 6, 4:50 PM MDT | Special Weather Statement | BOU | 40 min |
| Sep 6, 5:42 PM MDT | Special Weather Statement | BOU | 48 min |
| Sep 18, 4:31 PM MDT | Special Weather Statement | BOU | 44 min |
| Sep 19, 5:55 PM MDT | Severe Thunderstorm Warning | BOU | 29 min |
| Sep 20, 8:01 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Sep 20, 9:01 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 20, 10:52 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Sep 22, 6:12 PM MDT | Special Weather Statement | BOU | 33 min |
| Sep 22, 6:24 PM MDT | Special Weather Statement | BOU | 36 min |
| Sep 22, 7:00 PM MDT | Special Weather Statement | BOU | 45 min |
| Sep 22, 8:33 PM MDT | Special Weather Statement | BOU | 42 min |
| Sep 25, 3:33 PM MDT | Special Weather Statement | BOU | 42 min |
| Sep 25, 4:14 PM MDT | Special Weather Statement | BOU | 31 min |
| Sep 25, 4:29 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Sep 25, 5:07 PM MDT | Areal Flood Advisory | BOU | 113 min |
| Sep 27, 6:43 PM MDT | Special Weather Statement | BOU | 47 min |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 16 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 26 |
| Special Weather Statement | 45 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 4 |
| Flood Watch | 1 |
| Areal Flood Advisory | 14 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 3 |
| Cold Weather Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Fire | |
| Red Flag Warning | 19 |
| Fire Weather Watch | 15 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive2025
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.