Alert archive / Colorado / Denver County
Weather alerts in Denver County, Colorado, 2024
118 weather alerts in 2024, 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 2024. Tap one for its archive.
- Alerts
- 118
- Warnings
- 32
- Watches
- 19
- Advisories
- 25
- Busiest month
- June29 alerts
- Busiest day
- May 31, 20246 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, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 15 | 8 | 47% | 34 | 97% | 24 min |
| Flash flood warnings | 0 | 1 | 0% |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 27 | 2 | 93% | 15 | 20% | 11 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 295 | 119 | 60% | 339 | 79% | 20 min |
| NWS Denver/Boulder, CO: flash flood warnings | 32 | 9 | 72% | 14 | 79% | 40 min |
An office's figures cover every county it serves, including across state lines.
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 7, 3:35 AM MST | Winter Weather Advisory | BOU | 31 hr |
| Jan 11, 3:10 AM MST | Wind Chill Watch | BOU | 23 hr |
| Jan 12, 2:10 AM MST | Wind Chill Warning | BOU | 4 days |
| Feb 1, 2:09 PM MST | Winter Weather Advisory | BOU | 54 hr |
| Feb 2, 2:23 PM MST | Winter Storm Watch | BOU | 18 hr |
| Feb 3, 5:53 PM MST | Dense Fog Advisory | BOU | 16 hr |
| Feb 4, 5:15 PM MST | Dense Fog Advisory | BOU | 18 hr |
| Feb 8, 2:30 PM MST | Winter Storm Watch | BOU | 22 hr |
| Feb 9, 12:47 PM MST | Winter Weather Advisory | BOU | 40 hr |
| Feb 14, 2:18 PM MST | Winter Weather Advisory | BOU | 63 hr |
| Feb 15, 2:22 AM MST | Dense Fog Advisory | BOU | 8 hr |
| Feb 24, 1:49 AM MST | Fire Weather Watch | BOU | 12 hr |
| Feb 24, 1:43 PM MST | Red Flag Warning | BOU | 34 hr |
| Feb 25, 2:13 AM MST | Fire Weather Watch | BOU | 11 hr |
| Feb 25, 1:32 PM MST | Red Flag Warning | BOU | 28 hr |
| Feb 27, 8:39 AM MST | Snow Squall Warning | BOU | 36 min |
| Feb 27, 9:09 AM MST | Snow Squall Warning | BOU | 51 min |
| Feb 29, 12:10 PM MST | Fire Weather Watch | BOU | 19 hr |
| Mar 1, 6:46 AM MST | Red Flag Warning | BOU | 36 hr |
| Mar 11, 2:29 PM MDT | Winter Storm Watch | BOU | 47 hr |
| Mar 12, 2:12 PM MDT | Winter Storm Warning | BOU | 64 hr |
| Mar 23, 3:22 AM MDT | Winter Weather Advisory | BOU | 57 hr |
| Apr 4, 4:25 AM MDT | Red Flag Warning | BOU | 41 hr |
| Apr 4, 2:58 PM MDT | High Wind Watch | BOU | 36 hr |
| Apr 5, 11:50 AM MDT | High Wind Warning | BOU | 54 hr |
| Apr 19, 3:22 AM MDT | Winter Weather Advisory | BOU | 30 hr |
| Apr 20, 2:00 PM MDT | Dense Fog Advisory | BOU | 19 hr |
| Apr 26, 6:14 PM MDT | Special Weather Statement | BOU | 31 min |
| Apr 26, 6:22 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Apr 26, 7:41 PM MDT | Special Weather Statement | BOU | 34 min |
| Apr 27, 8:53 AM MDT | Areal Flood Advisory | BOU | 5 hr |
| Apr 27, 10:55 AM MDT | Areal Flood Advisory | BOU | 5 hr |
| May 6, 1:24 PM MDT | Freeze Watch | BOU | 23 hr |
| May 7, 4:07 PM MDT | Frost Advisory | BOU | 16 hr |
| May 22, 6:39 AM MDT | Areal Flood Advisory | BOU | 9 hr |
| May 29, 12:18 PM MDT | Mesoscale Discussion | SPC | 117 min |
| May 30, 9:30 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| May 30, 9:43 PM MDT | Severe Thunderstorm Warning | BOU | 47 min |
| May 30, 10:12 PM MDT | Severe Thunderstorm Warning | BOU | 48 min |
| May 30, 10:35 PM MDT | Severe Thunderstorm Warning | BOU | 40 min |
| May 30, 11:11 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| May 31, 2:00 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jun 1, 1:08 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 7, 2:15 PM MDT | Special Weather Statement | BOU | 45 min |
| Jun 7, 2:23 PM MDT | Severe Thunderstorm Warning | BOU | 40 min |
| Jun 7, 7:41 PM MDT | Special Weather Statement | BOU | 49 min |
| Jun 7, 7:54 PM MDT | Severe Thunderstorm Warning | BOU | 36 min |
| Jun 8, 11:51 AM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 8, 12:26 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 8, 3:19 PM MDT | Special Weather Statement | BOU | 41 min |
| Jun 9, 3:42 PM MDT | Severe Thunderstorm Warning | BOU | 33 min |
| Jun 9, 4:14 PM MDT | Special Weather Statement | BOU | 31 min |
| Jun 9, 4:22 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Jun 12, 3:41 PM MDT | Special Weather Statement | BOU | 49 min |
| Jun 13, 12:53 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 14, 1:44 PM MDT | Mesoscale Discussion | SPC | 61 min |
| Jun 14, 1:52 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Jun 14, 2:10 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 14, 2:26 PM MDT | Severe Thunderstorm Warning | BOU | 15 min |
| Jun 15, 2:35 PM MDT | Heat Advisory | BOU | 28 hr |
| Jun 16, 2:42 PM MDT | Fire Weather Watch | BOU | 12 hr |
| Jun 16, 2:42 PM MDT | Red Flag Warning | BOU | 30 hr |
| Jun 22, 2:15 PM MDT | Heat Advisory | BOU | 3 days |
| Jun 25, 4:42 PM MDT | Special Weather Statement | BOU | 33 min |
| Jun 26, 2:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 5:16 PM MDT | Special Weather Statement | BOU | 29 min |
| Jun 27, 6:56 PM MDT | Special Weather Statement | BOU | 34 min |
| Jun 27, 7:52 PM MDT | Special Weather Statement | BOU | 23 min |
| Jun 27, 8:48 PM MDT | Special Weather Statement | BOU | 57 min |
| Jun 29, 6:18 PM MDT | Severe Thunderstorm Warning | BOU | 27 min |
| Jun 30, 3:54 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jul 7, 2:12 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 10, 12:24 PM MDT | Heat Advisory | BOU | 56 hr |
| Jul 10, 12:24 PM MDT | Heat Advisory | BOU | 3 days |
| Jul 10, 12:24 PM MDT | Heat Advisory | BOU | 4 days |
| Jul 13, 9:38 PM MDT | Special Weather Statement | BOU | 52 min |
| Jul 15, 2:49 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jul 17, 12:20 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 18, 4:01 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jul 20, 8:19 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Jul 20, 8:32 PM MDT | Severe Thunderstorm Warning | BOU | 28 min |
| Jul 20, 9:00 PM MDT | Special Weather Statement | BOU | 30 min |
| Jul 20, 9:14 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Jul 29, 2:41 AM MDT | Heat Advisory | BOU | 41 hr |
| Aug 2, 1:42 PM MDT | Heat Advisory | BOU | 54 hr |
| Aug 2, 2:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Aug 6, 4:43 PM MDT | Special Weather Statement | BOU | 47 min |
| Aug 11, 5:59 PM MDT | Special Weather Statement | BOU | 46 min |
| Aug 11, 6:06 PM MDT | Severe Thunderstorm Warning | BOU | 24 min |
| Aug 11, 8:23 PM MDT | Special Weather Statement | BOU | 37 min |
| Aug 12, 9:50 AM MDT | Flood Watch | BOU | 14 hr |
| Aug 12, 1:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 13, 2:42 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 5:49 PM MDT | Special Weather Statement | BOU | 26 min |
| Aug 18, 6:26 PM MDT | Special Weather Statement | BOU | 34 min |
| Aug 19, 6:07 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Aug 21, 6:22 PM MDT | Special Weather Statement | BOU | 38 min |
| Aug 23, 2:57 PM MDT | Special Weather Statement | BOU | 33 min |
| Sep 4, 3:40 PM MDT | Special Weather Statement | BOU | 35 min |
| Sep 10, 2:01 PM MDT | Fire Weather Watch | BOU | 24 hr |
| Sep 11, 2:14 PM MDT | Red Flag Warning | BOU | 30 hr |
| Sep 17, 1:08 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 17, 2:11 PM MDT | Special Weather Statement | BOU | 34 min |
| Sep 17, 2:36 PM MDT | Severe Thunderstorm Warning | BOU | 39 min |
| Oct 3, 2:18 PM MDT | Fire Weather Watch | BOU | 23 hr |
| Oct 4, 1:27 PM MDT | Red Flag Warning | BOU | 30 hr |
| Oct 24, 3:04 AM MDT | Red Flag Warning | BOU | 15 hr |
| Oct 28, 3:04 PM MDT | Freeze Watch | BOU | 23 hr |
| Oct 29, 1:59 PM MDT | Freeze Warning | BOU | 43 hr |
| Nov 5, 3:38 AM MST | Winter Weather Advisory | BOU | 61 hr |
| Nov 7, 3:51 AM MST | Winter Storm Watch | BOU | 10 hr |
| Nov 7, 1:43 PM MST | Winter Storm Warning | BOU | 46 hr |
| Nov 8, 12:51 PM MST | Mesoscale Discussion | SPC | 4 hr |
| Nov 25, 1:15 AM MST | Winter Weather Advisory | BOU | 61 hr |
| Dec 28, 2:12 PM MST | High Wind Watch | BOU | 24 hr |
| Dec 28, 2:27 PM MST | Fire Weather Watch | BOU | 13 hr |
| Dec 29, 3:35 AM MST | Red Flag Warning | BOU | 37 hr |
| Dec 29, 2:17 PM MST | High Wind Warning | BOU | 27 hr |
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 | 15 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 19 |
| Special Weather Statement | 23 |
| Flooding | |
| Flood Watch | 1 |
| Areal Flood Advisory | 5 |
| Winter | |
| Snow Squall Warning | 2 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 7 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Warning | 1 |
| Freeze Watch | 2 |
| Wind Chill Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 2 |
| Fire | |
| Red Flag Warning | 9 |
| Fire Weather Watch | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20232025
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.