Alert archive / Colorado / Denver County
Weather alerts in Denver County, Colorado, 2013
110 weather alerts in 2013, 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 2013. Tap one for its archive.
- Alerts
- 110
- Warnings
- 32
- Watches
- 12
- Advisories
- 27
- Busiest month
- September33 alerts
- Busiest day
- September 12, 201311 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 1 tornado warnings covering Denver County in 2013 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 13 minutes after it went out.
Denver County, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 1 | 100% | 13 min |
| Severe thunderstorm warnings | 7 | 2 | 71% | 3 | 67% | 11 min |
| Flash flood warnings | 12 | 1 | 92% | 0 |
Each office's whole area, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 61 | 9 | 85% | 16 | 75% | 18 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 227 | 65 | 71% | 173 | 61% | 18 min |
| NWS Denver/Boulder, CO: flash flood warnings | 85 | 19 | 78% | 50 | 82% | 148 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 |
|---|---|---|---|
| Feb 17, 1:05 PM MST | Red Flag Warning | BOU | 5 hr |
| Feb 19, 4:19 AM MST | Winter Storm Watch | BOU | 30 hr |
| Feb 20, 4:17 AM MST | Winter Weather Advisory | BOU | 30 hr |
| Feb 22, 3:27 PM MST | Winter Storm Watch | BOU | 24 hr |
| Feb 23, 3:41 PM MST | Winter Storm Warning | BOU | 29 hr |
| Feb 24, 5:44 AM MST | Mesoscale Discussion | SPC | 4 hr |
| Mar 7, 4:21 AM MST | Winter Storm Watch | BOU | 24 hr |
| Mar 8, 4:14 AM MST | Winter Storm Warning | BOU | 37 hr |
| Mar 9, 6:33 AM MST | Mesoscale Discussion | SPC | 4 hr |
| Mar 22, 6:20 AM MDT | Winter Storm Warning | BOU | 36 hr |
| Mar 22, 4:28 PM MDT | Winter Weather Advisory | BOU | 26 hr |
| Apr 7, 4:15 AM MDT | Winter Storm Watch | BOU | 36 hr |
| Apr 8, 11:19 AM MDT | Winter Storm Warning | BOU | 27 hr |
| Apr 8, 4:26 PM MDT | Winter Weather Advisory | BOU | 35 hr |
| Apr 15, 4:51 AM MDT | Winter Storm Warning | BOU | 23 hr |
| Apr 15, 4:51 AM MDT | Winter Weather Advisory | BOU | 23 hr |
| Apr 16, 3:52 PM MDT | Winter Weather Advisory | BOU | 35 hr |
| Apr 22, 5:46 AM MDT | Winter Weather Advisory | BOU | 27 hr |
| Apr 30, 12:12 PM MDT | Winter Weather Advisory | BOU | 39 hr |
| May 26, 2:49 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Jun 10, 2:58 PM MDT | Special Weather Statement | BOU | 47 min |
| Jun 10, 7:06 PM MDT | Special Weather Statement | BOU | 39 min |
| Jun 13, 1:14 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jun 15, 1:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 15, 5:57 PM MDT | Mesoscale Discussion | SPC | 63 min |
| Jun 17, 2:21 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 18, 1:07 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jun 18, 2:09 PM MDT | Tornado Warning | BOU | 36 min |
| Jun 18, 5:11 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jun 18, 7:52 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jun 23, 3:48 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jun 23, 4:29 PM MDT | Special Weather Statement | BOU | 31 min |
| Jun 23, 4:40 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 23, 7:19 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Jun 23, 9:07 PM MDT | Special Weather Statement | BOU | 23 min |
| Jun 28, 1:54 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 28, 8:10 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jun 29, 12:44 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 10, 1:09 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Jul 10, 1:29 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 13, 4:28 PM MDT | Special Weather Statement | BOU | 47 min |
| Jul 13, 5:20 PM MDT | Areal Flood Advisory | BOU | 115 min |
| Jul 15, 12:25 PM MDT | Special Weather Statement | BOU | 50 min |
| Jul 15, 12:31 PM MDT | Areal Flood Advisory | BOU | 119 min |
| Jul 15, 1:34 PM MDT | Areal Flood Advisory | BOU | 116 min |
| Jul 20, 4:43 PM MDT | Special Weather Statement | BOU | 32 min |
| Jul 20, 7:06 PM MDT | Severe Thunderstorm Warning | BOU | 24 min |
| Jul 27, 2:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 28, 4:20 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 1:50 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Aug 3, 2:35 PM MDT | Tornado Watch | SPC | 6 hr |
| Aug 3, 3:03 PM MDT | Special Weather Statement | BOU | 42 min |
| Aug 3, 5:21 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Aug 3, 6:24 PM MDT | Severe Thunderstorm Warning | BOU | 36 min |
| Aug 3, 6:29 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Aug 3, 7:31 PM MDT | Areal Flood Advisory | BOU | 89 min |
| Aug 8, 6:50 PM MDT | Special Weather Statement | BOU | 55 min |
| Aug 8, 7:13 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 8, 7:37 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Aug 10, 6:46 PM MDT | Special Weather Statement | BOU | 14 min |
| Aug 10, 6:48 PM MDT | Special Weather Statement | BOU | 27 min |
| Aug 12, 2:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 6:58 PM MDT | Special Weather Statement | BOU | 47 min |
| Aug 13, 2:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 15, 6:30 PM MDT | Special Weather Statement | BOU | 30 min |
| Aug 22, 5:45 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 22, 5:45 PM MDT | Severe Thunderstorm Warning | BOU | 30 min |
| Aug 22, 6:26 PM MDT | Severe Thunderstorm Warning | BOU | 49 min |
| Aug 22, 6:58 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Aug 23, 5:31 PM MDT | Special Weather Statement | BOU | 44 min |
| Sep 4, 4:45 PM MDT | Special Weather Statement | BOU | 45 min |
| Sep 9, 2:57 PM MDT | Special Weather Statement | BOU | 48 min |
| Sep 9, 3:53 PM MDT | Areal Flood Advisory | BOU | 67 min |
| Sep 9, 4:09 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 10, 5:04 PM MDT | Areal Flood Advisory | BOU | 56 min |
| Sep 11, 4:06 PM MDT | Areal Flood Advisory | BOU | 114 min |
| Sep 11, 9:47 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Sep 11, 10:01 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 12, 12:59 AM MDT | Areal Flood Warning | BOU | 3 hr |
| Sep 12, 5:00 AM MDT | Flash Flood Watch | BOU | 40 hr |
| Sep 12, 5:24 AM MDT | Areal Flood Advisory | BOU | 3 hr |
| Sep 12, 6:01 AM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 12, 8:28 AM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 12, 9:02 AM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 12, 9:12 AM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 12, 12:14 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 12, 5:04 PM MDT | Flash Flood Warning | BOU | 4 hr |
| Sep 12, 7:35 PM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 12, 9:35 PM MDT | Flash Flood Warning | BOU | 6 hr |
| Sep 13, 7:34 AM MDT | Areal Flood Warning | BOU | 24 hr |
| Sep 13, 5:20 PM MDT | Areal Flood Advisory | BOU | 85 min |
| Sep 14, 4:30 AM MDT | Flash Flood Watch | BOU | 40 hr |
| Sep 14, 3:38 PM MDT | Severe Thunderstorm Warning | BOU | 37 min |
| Sep 14, 3:53 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 14, 4:23 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 14, 7:00 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 15, 9:10 AM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 15, 12:32 PM MDT | Flash Flood Warning | BOU | 4 hr |
| Sep 15, 9:22 PM MDT | Areal Flood Advisory | BOU | 12 hr |
| Sep 22, 5:32 PM MDT | Special Weather Statement | BOU | 43 min |
| Sep 22, 5:42 PM MDT | Severe Thunderstorm Warning | BOU | 33 min |
| Sep 22, 6:04 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Sep 27, 4:13 AM MDT | Frost Advisory | BOU | 28 hr |
| Oct 3, 10:27 AM MDT | Freeze Watch | BOU | 20 hr |
| Oct 4, 6:06 AM MDT | Freeze Warning | BOU | 27 hr |
| Oct 21, 2:05 AM MDT | Dense Fog Advisory | BOU | 7 hr |
| Nov 20, 3:07 PM MST | Winter Weather Advisory | BOU | 25 hr |
| Dec 2, 3:42 PM MST | Winter Storm Watch | BOU | 13 hr |
| Dec 3, 4:52 AM MST | Winter Weather Advisory | BOU | 31 hr |
| Dec 21, 5:15 AM MST | Dense Fog Advisory | BOU | 5 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20122014
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.