Alert archive / Colorado / Broomfield County
Weather alerts in Broomfield County, Colorado, 2013
89 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Broomfield County and its neighbors
Each county as a circle sized by its count in 2013. Tap one for its archive.
- Alerts
- 89
- Warnings
- 29
- Watches
- 16
- Advisories
- 19
- Busiest month
- September19 alerts
- Busiest day
- September 12, 20135 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Broomfield County, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 2 | 33% | 1 | 100% | 35 min |
| Flash flood warnings | 4 | 2 | 50% | 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 19, 3:49 AM MDT | Red Flag Warning | BOU | 14 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 14, 5:15 AM MDT | Winter Storm Watch | BOU | 26 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 22, 9:20 AM MDT | Winter Storm Warning | BOU | 20 hr |
| Apr 29, 3:05 PM MDT | Winter Storm Watch | BOU | 21 hr |
| Apr 30, 4:05 AM MDT | Winter Storm Warning | BOU | 40 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, 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, 2:34 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| 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 23, 7:19 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Jun 28, 1:54 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 28, 8:10 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jun 28, 8:12 PM MDT | Severe Thunderstorm Warning | BOU | 33 min |
| Jun 28, 9:32 PM MDT | Severe Thunderstorm Warning | BOU | 28 min |
| Jun 29, 12:44 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 8, 2:33 PM MDT | Special Weather Statement | BOU | 27 min |
| Jul 8, 3:04 PM MDT | Special Weather Statement | BOU | 41 min |
| Jul 15, 1:34 PM MDT | Areal Flood Advisory | BOU | 116 min |
| Jul 20, 4:18 PM MDT | Special Weather Statement | BOU | 27 min |
| Jul 27, 2:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 3, 1:50 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Aug 3, 2:35 PM MDT | Tornado Watch | SPC | 6 hr |
| Aug 3, 5:21 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Aug 3, 5:34 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Aug 3, 6:29 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Aug 10, 5:56 PM MDT | Special Weather Statement | BOU | 19 min |
| Aug 12, 2:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 13, 2:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 23, 5:05 PM MDT | Special Weather Statement | BOU | 40 min |
| Aug 23, 5:31 PM MDT | Special Weather Statement | BOU | 44 min |
| Aug 23, 6:42 PM MDT | Special Weather Statement | BOU | 33 min |
| Sep 9, 3:53 PM MDT | Areal Flood Advisory | BOU | 67 min |
| Sep 11, 4:06 PM MDT | Areal Flood Advisory | BOU | 114 min |
| Sep 11, 6:36 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 11, 7:58 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 11, 11:42 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 12, 5:00 AM MDT | Flash Flood Watch | BOU | 40 hr |
| Sep 12, 8:28 AM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 12, 7:35 PM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 13, 7:34 AM MDT | Areal Flood Warning | BOU | 24 hr |
| Sep 14, 4:30 AM MDT | Flash Flood Watch | BOU | 40 hr |
| Sep 14, 7:50 AM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 15, 9:10 AM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 15, 11:50 AM MDT | Flash Flood Warning | BOU | 4 hr |
| Sep 15, 9:22 PM MDT | Areal Flood Advisory | BOU | 12 hr |
| Sep 16, 3:55 AM MDT | Flash Flood Watch | BOU | 15 hr |
| Sep 16, 10:18 AM MDT | Areal Flood Advisory | BOU | 23 hr |
| Sep 17, 10:06 AM MDT | Areal Flood Advisory | BOU | 24 hr |
| Sep 18, 4:16 PM MDT | Special Weather Statement | BOU | 29 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 10, 3:49 AM MDT | High Wind Watch | BOU | 11 hr |
| Oct 10, 2:55 PM MDT | High Wind Warning | BOU | 18 hr |
| Oct 14, 3:44 PM MDT | Freeze Warning | BOU | 17 hr |
| Oct 15, 9:05 AM MDT | Freeze Warning | BOU | 24 hr |
| Oct 21, 2:05 AM MDT | Dense Fog Advisory | BOU | 7 hr |
| Oct 31, 8:57 PM MDT | High Wind Warning | BOU | 5 hr |
| Nov 15, 4:43 AM MST | High Wind Watch | BOU | 31 hr |
| Nov 20, 3:07 PM MST | Winter Weather Advisory | BOU | 25 hr |
| Dec 1, 2:26 PM MST | High Wind Warning | BOU | 28 hr |
| Dec 2, 4:16 AM MST | Winter Storm Warning | BOU | 59 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 10, 5:20 PM MST | High Wind Warning | BOU | 4 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.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 3 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 16 |
| Special Weather Statement | 9 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flash Flood Warning | 4 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 7 |
| Winter | |
| Winter Storm Warning | 8 |
| Winter Storm Watch | 7 |
| Winter Weather Advisory | 9 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 4 |
| High Wind Watch | 2 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
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.