Alert archive / Colorado / Arapahoe County
Weather alerts in Arapahoe County, Colorado, 2025
201 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Arapahoe County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 201
- Warnings
- 57
- Watches
- 28
- Advisories
- 35
- Busiest month
- June46 alerts
- Busiest day
- June 17, 20258 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 4 tornado warnings covering Arapahoe County in 2025 had a tornado report inside them; 3 of 7 tornado reports fell inside a warning, on average 16 minutes after it went out.
Arapahoe County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 2 | 50% | 7 | 43% | 16 min |
| Severe thunderstorm warnings | 30 | 8 | 73% | 13 | 69% | 10 min |
| Flash flood warnings | 3 | 0 | 100% | 0 |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 32 | 10 | 69% | 25 | 56% | 13 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 363 | 126 | 65% | 369 | 75% | 20 min |
| NWS Denver/Boulder, CO: flash flood warnings | 22 | 2 | 91% | 5 | 60% | 42 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 3, 1:36 PM MST | Dense Fog Advisory | BOU | 20 hr |
| Jan 3, 1:49 PM MST | Winter Weather Advisory | BOU | 49 hr |
| Jan 6, 1:50 AM MST | Winter Weather Advisory | BOU | 34 hr |
| Jan 8, 2:32 PM MST | Winter Weather Advisory | BOU | 26 hr |
| Jan 16, 1:51 PM MST | Winter Weather Advisory | BOU | 51 hr |
| Jan 17, 2:02 PM MST | Cold Weather Advisory | BOU | 4 days |
| Jan 29, 10:41 AM MST | Winter Weather Advisory | BOU | 27 hr |
| Feb 10, 2:11 PM MST | Winter Weather Advisory | BOU | 43 hr |
| Feb 12, 2:21 AM MST | Cold Weather Advisory | BOU | 30 hr |
| Feb 15, 2:00 AM MST | Dense Fog Advisory | BOU | 9 hr |
| Feb 20, 3:12 AM MST | Winter Weather Advisory | BOU | 29 hr |
| Mar 2, 2:34 AM MST | Winter Storm Watch | BOU | 33 hr |
| Mar 2, 2:38 PM MST | Winter Weather Advisory | BOU | 50 hr |
| Mar 3, 2:16 AM MST | Blizzard Warning | BOU | 25 hr |
| Mar 3, 2:16 AM MST | Winter Storm Warning | BOU | 25 hr |
| Mar 3, 2:20 AM MST | High Wind Watch | BOU | 10 hr |
| Mar 3, 2:20 AM MST | High Wind Warning | BOU | 39 hr |
| Mar 16, 2:48 AM MDT | Fire Weather Watch | BOU | 11 hr |
| Mar 16, 1:54 PM MDT | Red Flag Warning | BOU | 29 hr |
| Mar 17, 12:38 PM MDT | Winter Weather Advisory | BOU | 44 hr |
| Mar 17, 7:00 PM MDT | Red Flag Warning | BOU | 24 hr |
| Mar 18, 2:12 PM MDT | Blizzard Warning | BOU | 15 hr |
| Mar 21, 2:28 AM MDT | Fire Weather Watch | BOU | 13 hr |
| Mar 21, 3:09 PM MDT | Red Flag Warning | BOU | 29 hr |
| Apr 1, 4:16 PM MDT | Special Weather Statement | BOU | 29 min |
| Apr 3, 4:46 PM MDT | Special Weather Statement | BOU | 44 min |
| Apr 8, 2:01 PM MDT | Red Flag Warning | BOU | 29 hr |
| Apr 10, 2:31 AM MDT | Fire Weather Watch | BOU | 36 hr |
| Apr 11, 2:45 PM MDT | Red Flag Warning | BOU | 29 hr |
| Apr 15, 2:50 PM MDT | Fire Weather Watch | BOU | 36 hr |
| Apr 16, 2:13 PM MDT | Red Flag Warning | BOU | 29 hr |
| Apr 16, 2:33 PM MDT | Winter Weather Advisory | BOU | 63 hr |
| Apr 24, 2:35 PM MDT | Special Weather Statement | BOU | 40 min |
| Apr 24, 2:42 PM MDT | Severe Thunderstorm Warning | BOU | 33 min |
| Apr 24, 2:45 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 25, 2:15 PM MDT | Fire Weather Watch | BOU | 24 hr |
| Apr 26, 1:58 PM MDT | Red Flag Warning | BOU | 30 hr |
| May 11, 5:38 PM MDT | Special Weather Statement | BOU | 37 min |
| May 14, 3:56 PM MDT | Mesoscale Discussion | SPC | 94 min |
| May 14, 4:28 PM MDT | Special Weather Statement | BOU | 47 min |
| May 17, 7:26 PM MDT | Special Weather Statement | BOU | 49 min |
| May 18, 1:09 PM MDT | Severe Thunderstorm Warning | BOU | 36 min |
| May 18, 1:12 PM MDT | Tornado Warning | BOU | 33 min |
| May 18, 1:33 PM MDT | Tornado Warning | BOU | 27 min |
| May 19, 1:59 PM MDT | Frost Advisory | BOU | 18 hr |
| May 24, 12:24 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 24, 1:14 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 24, 5:46 PM MDT | Mesoscale Discussion | SPC | 89 min |
| May 24, 7:13 PM MDT | Dense Fog Advisory | BOU | 10 hr |
| May 25, 4:59 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| May 26, 3:28 PM MDT | Areal Flood Advisory | BOU | 109 min |
| May 27, 1:43 AM MDT | Dense Fog Advisory | BOU | 7 hr |
| May 27, 4:37 PM MDT | Mesoscale Discussion | SPC | 53 min |
| May 28, 11:53 AM MDT | Mesoscale Discussion | SPC | 3 hr |
| May 28, 3:39 PM MDT | Special Weather Statement | BOU | 36 min |
| May 30, 5:42 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Jun 1, 4:38 PM MDT | Severe Thunderstorm Warning | BOU | 37 min |
| Jun 1, 5:01 PM MDT | Severe Thunderstorm Warning | BOU | 29 min |
| Jun 4, 6:09 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Jun 5, 12:30 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 1:39 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 5, 2:49 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Jun 5, 5:49 PM MDT | Areal Flood Advisory | BOU | 56 min |
| Jun 6, 12:39 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jun 6, 1:46 PM MDT | Special Weather Statement | BOU | 44 min |
| Jun 6, 1:49 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 6, 2:06 PM MDT | Special Weather Statement | BOU | 24 min |
| Jun 6, 2:26 PM MDT | Severe Thunderstorm Warning | BOU | 43 min |
| Jun 8, 2:50 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jun 11, 4:42 PM MDT | Special Weather Statement | BOU | 33 min |
| Jun 12, 2:04 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jun 13, 12:41 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 3:39 PM MDT | Special Weather Statement | BOU | 51 min |
| Jun 13, 4:42 PM MDT | Severe Thunderstorm Warning | BOU | 33 min |
| Jun 15, 2:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jun 15, 4:02 PM MDT | Severe Thunderstorm Warning | BOU | 25 min |
| Jun 16, 5:12 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jun 17, 3:45 AM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 17, 4:56 AM MDT | Mesoscale Discussion | SPC | 64 min |
| Jun 17, 5:21 AM MDT | Severe Thunderstorm Warning | BOU | 39 min |
| Jun 17, 5:31 AM MDT | Severe Thunderstorm Warning | BOU | 44 min |
| Jun 17, 5:56 AM MDT | Severe Thunderstorm Warning | BOU | 34 min |
| Jun 17, 10:08 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 10:48 AM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 17, 12:55 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 1:51 PM MDT | Heat Advisory | BOU | 3 days |
| Jun 24, 12:35 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jun 24, 1:09 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 24, 1:58 PM MDT | Tornado Warning | BOU | 18 min |
| Jun 24, 2:07 PM MDT | Severe Thunderstorm Warning | BOU | 30 min |
| Jun 24, 2:15 PM MDT | Tornado Warning | BOU | 30 min |
| Jun 24, 2:34 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Jun 25, 3:42 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jun 25, 8:21 PM MDT | Severe Thunderstorm Warning | BOU | 24 min |
| Jun 27, 3:08 PM MDT | Special Weather Statement | BOU | 37 min |
| Jun 27, 3:42 PM MDT | Special Weather Statement | BOU | 33 min |
| Jun 27, 4:15 PM MDT | Special Weather Statement | BOU | 45 min |
| Jun 29, 12:52 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jun 29, 1:45 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 29, 5:09 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 6:12 PM MDT | Severe Thunderstorm Warning | BOU | 33 min |
| Jun 29, 6:41 PM MDT | Severe Thunderstorm Warning | BOU | 34 min |
| Jul 5, 1:04 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 6, 12:38 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 6, 1:17 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 6, 6:37 PM MDT | Special Weather Statement | BOU | 38 min |
| Jul 7, 1:23 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 1:49 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 7, 2:17 PM MDT | Special Weather Statement | BOU | 43 min |
| Jul 7, 2:28 PM MDT | Heat Advisory | BOU | 55 hr |
| Jul 10, 11:59 AM MDT | Special Weather Statement | BOU | 31 min |
| Jul 10, 1:14 PM MDT | Special Weather Statement | BOU | 31 min |
| Jul 10, 1:43 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 1:51 PM MDT | Severe Thunderstorm Warning | BOU | 39 min |
| Jul 10, 2:28 PM MDT | Severe Thunderstorm Warning | BOU | 47 min |
| Jul 10, 2:29 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 10, 3:00 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| Jul 11, 2:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jul 11, 2:57 PM MDT | Special Weather Statement | BOU | 33 min |
| Jul 14, 2:51 PM MDT | Special Weather Statement | BOU | 24 min |
| Jul 14, 3:14 PM MDT | Special Weather Statement | BOU | 31 min |
| Jul 14, 3:42 PM MDT | Special Weather Statement | BOU | 48 min |
| Jul 14, 4:04 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Jul 16, 1:36 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jul 16, 2:45 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 16, 5:01 PM MDT | Mesoscale Discussion | SPC | 59 min |
| Jul 21, 5:25 PM MDT | Special Weather Statement | BOU | 50 min |
| Jul 22, 5:15 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Jul 23, 2:43 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 7:45 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Jul 23, 7:54 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Jul 24, 1:41 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 24, 6:12 PM MDT | Severe Thunderstorm Warning | BOU | 63 min |
| Jul 24, 6:48 PM MDT | Areal Flood Advisory | BOU | 117 min |
| Jul 24, 8:25 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Jul 25, 4:09 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jul 25, 6:47 PM MDT | Special Weather Statement | BOU | 28 min |
| Jul 25, 7:20 PM MDT | Special Weather Statement | BOU | 25 min |
| Jul 25, 7:56 PM MDT | Special Weather Statement | BOU | 34 min |
| Jul 26, 6:20 PM MDT | Special Weather Statement | BOU | 25 min |
| Jul 29, 10:13 AM MDT | Flood Watch | BOU | 10 hr |
| Jul 29, 6:07 PM MDT | Areal Flood Advisory | BOU | 113 min |
| Jul 30, 3:20 AM MDT | Flood Watch | BOU | 16 hr |
| Jul 31, 1:49 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Jul 31, 4:52 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 3:28 PM MDT | Special Weather Statement | BOU | 47 min |
| Aug 1, 3:50 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 2, 1:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Aug 2, 3:01 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 2, 4:10 PM MDT | Special Weather Statement | BOU | 35 min |
| Aug 2, 4:19 PM MDT | Severe Thunderstorm Warning | BOU | 31 min |
| Aug 2, 4:36 PM MDT | Severe Thunderstorm Warning | BOU | 32 min |
| Aug 2, 8:54 PM MDT | Special Weather Statement | BOU | 51 min |
| Aug 5, 1:45 PM MDT | Heat Advisory | BOU | 53 hr |
| Aug 6, 3:40 PM MDT | Special Weather Statement | BOU | 65 min |
| Aug 7, 5:46 PM MDT | Special Weather Statement | BOU | 44 min |
| Aug 9, 12:53 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 9, 1:31 PM MDT | Special Weather Statement | BOU | 29 min |
| Aug 9, 2:27 PM MDT | Special Weather Statement | BOU | 48 min |
| Aug 10, 11:46 AM MDT | Mesoscale Discussion | SPC | 59 min |
| Aug 10, 12:15 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Aug 10, 2:49 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Aug 10, 3:08 PM MDT | Severe Thunderstorm Warning | BOU | 52 min |
| Aug 10, 3:48 PM MDT | Severe Thunderstorm Warning | BOU | 42 min |
| Aug 10, 3:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 7:29 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 2:20 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 18, 2:21 PM MDT | Special Weather Statement | BOU | 24 min |
| Aug 18, 3:10 PM MDT | Severe Thunderstorm Warning | BOU | 24 min |
| Aug 22, 1:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Aug 23, 1:21 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Aug 26, 5:20 PM MDT | Areal Flood Advisory | BOU | 115 min |
| Aug 26, 5:52 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 26, 6:37 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Aug 27, 2:13 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 28, 1:06 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Aug 28, 5:52 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Aug 28, 6:27 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 28, 7:03 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Sep 11, 2:47 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Sep 16, 4:35 PM MDT | Severe Thunderstorm Warning | BOU | 25 min |
| Sep 16, 5:06 PM MDT | Severe Thunderstorm Warning | BOU | 39 min |
| Oct 15, 12:50 PM MDT | Frost Advisory | BOU | 43 hr |
| Oct 15, 2:02 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Oct 17, 1:34 PM MDT | Frost Advisory | BOU | 42 hr |
| Oct 17, 1:34 PM MDT | Freeze Watch | BOU | 13 hr |
| Oct 17, 1:39 PM MDT | Fire Weather Watch | BOU | 24 hr |
| Oct 18, 2:06 AM MDT | Freeze Warning | BOU | 30 hr |
| Oct 18, 1:26 PM MDT | Fire Weather Watch | BOU | 24 hr |
| Oct 19, 1:32 PM MDT | Red Flag Warning | BOU | 28 hr |
| Oct 20, 2:06 AM MDT | Freeze Warning | BOU | 30 hr |
| Oct 27, 12:27 PM MDT | Freeze Warning | BOU | 22 hr |
| Oct 27, 12:27 PM MDT | Freeze Warning | BOU | 46 hr |
| Dec 1, 1:52 PM MST | Winter Weather Advisory | BOU | 54 hr |
| Dec 11, 8:16 AM MST | Red Flag Warning | BOU | 9 hr |
| Dec 15, 1:20 PM MST | Fire Weather Watch | BOU | 14 hr |
| Dec 16, 3:06 AM MST | Red Flag Warning | BOU | 39 hr |
| Dec 17, 3:24 PM MST | Fire Weather Watch | BOU | 35 hr |
| Dec 18, 2:44 PM MST | Red Flag Warning | BOU | 33 hr |
| Dec 21, 2:31 PM MST | Fire Weather Watch | BOU | 11 hr |
| Dec 22, 1:48 AM MST | Red Flag Warning | BOU | 15 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 | 30 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 12 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 46 |
| Special Weather Statement | 35 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flood Watch | 2 |
| Areal Flood Advisory | 12 |
| Winter | |
| Blizzard Warning | 2 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 11 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 1 |
| Cold Weather Advisory | 2 |
| Frost Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Fire | |
| Red Flag Warning | 12 |
| Fire Weather Watch | 10 |
| 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 archive20242026
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.