Alert archive / Colorado / Broomfield County
Weather alerts in Broomfield County, Colorado, 2012
70 weather alerts in 2012, 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 2012. Tap one for its archive.
- Alerts
- 70
- Warnings
- 22
- Watches
- 18
- Advisories
- 7
- Busiest month
- May15 alerts
- Busiest day
- May 2, 201211 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, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 0 | 100% | 2 | 0% | |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 24 | 7 | 71% | 17 | 47% | 23 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 95 | 39 | 59% | 128 | 58% | 20 min |
| NWS Denver/Boulder, CO: flash flood warnings | 26 | 7 | 73% | 12 | 50% | 62 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 16, 2:36 PM MST | High Wind Watch | BOU | 36 hr |
| Jan 17, 9:57 AM MST | High Wind Warning | BOU | 50 hr |
| Feb 1, 4:09 AM MST | Winter Storm Watch | BOU | 25 hr |
| Feb 2, 5:07 AM MST | Winter Storm Warning | BOU | 47 hr |
| Feb 2, 5:08 PM MST | Mesoscale Discussion | SPC | 4 hr |
| Feb 21, 4:17 AM MST | High Wind Warning | BOU | 48 hr |
| Feb 23, 4:37 AM MST | Winter Weather Advisory | BOU | 6 hr |
| Feb 27, 2:16 PM MST | High Wind Watch | BOU | 19 hr |
| Feb 29, 3:12 PM MST | Winter Weather Advisory | BOU | 38 hr |
| Mar 5, 11:39 PM MST | Red Flag Warning | BOU | 18 hr |
| Mar 16, 4:10 AM MDT | Fire Weather Watch | BOU | 11 hr |
| Mar 16, 3:07 PM MDT | Red Flag Warning | BOU | 29 hr |
| Mar 17, 7:38 PM MDT | Red Flag Warning | BOU | 26 hr |
| Mar 24, 2:09 PM MDT | Fire Weather Watch | BOU | 22 hr |
| Mar 25, 12:15 PM MDT | Red Flag Warning | BOU | 33 hr |
| Apr 5, 4:05 AM MDT | Fire Weather Watch | BOU | 12 hr |
| Apr 5, 3:38 PM MDT | Red Flag Warning | BOU | 28 hr |
| Apr 26, 8:41 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 2, 2:03 PM MDT | Special Weather Statement | BOU | 27 min |
| May 2, 2:06 PM MDT | Special Weather Statement | BOU | 24 min |
| May 2, 2:09 PM MDT | Special Weather Statement | BOU | 21 min |
| May 2, 2:28 PM MDT | Special Weather Statement | BOU | 7 min |
| May 2, 2:30 PM MDT | Special Weather Statement | BOU | 5 min |
| May 2, 3:00 PM MDT | Special Weather Statement | BOU | 2 hr |
| May 2, 3:02 PM MDT | Special Weather Statement | BOU | 2 hr |
| May 2, 3:53 PM MDT | Special Weather Statement | BOU | 77 min |
| May 2, 3:59 PM MDT | Special Weather Statement | BOU | 11 min |
| May 2, 4:05 PM MDT | Special Weather Statement | BOU | 5 min |
| May 2, 5:35 PM MDT | Special Weather Statement | BOU | 5 min |
| May 17, 2:36 PM MDT | Fire Weather Watch | BOU | 13 hr |
| May 18, 4:05 AM MDT | Red Flag Warning | BOU | 16 hr |
| May 25, 4:01 AM MDT | High Wind Watch | BOU | 23 hr |
| May 26, 2:39 AM MDT | High Wind Warning | BOU | 17 hr |
| Jun 3, 1:03 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 6, 12:54 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 6, 3:01 PM MDT | Tornado Watch | SPC | 8 hr |
| Jun 6, 6:47 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Jun 6, 8:37 PM MDT | Mesoscale Discussion | SPC | 23 min |
| Jun 7, 10:47 AM MDT | Flash Flood Watch | BOU | 13 hr |
| Jun 7, 11:46 AM MDT | Tornado Watch | SPC | 10 hr |
| Jun 7, 1:59 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jun 7, 5:52 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jun 16, 3:58 AM MDT | Fire Weather Watch | BOU | 10 hr |
| Jun 16, 2:02 PM MDT | Red Flag Warning | BOU | 30 hr |
| Jun 17, 4:37 AM MDT | Red Flag Warning | BOU | 40 hr |
| Jun 21, 3:16 PM MDT | Red Flag Warning | BOU | 54 hr |
| Jun 24, 2:54 PM MDT | Red Flag Warning | BOU | 30 hr |
| Jun 27, 1:25 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 6, 8:41 PM MDT | Flash Flood Watch | BOU | 32 hr |
| Jul 8, 5:05 AM MDT | Flash Flood Watch | BOU | 18 hr |
| Jul 31, 1:03 PM MDT | Special Weather Statement | BOU | 27 min |
| Jul 31, 2:05 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Aug 11, 6:50 PM MDT | Severe Thunderstorm Warning | BOU | 26 min |
| Aug 11, 7:11 PM MDT | Severe Thunderstorm Warning | BOU | 19 min |
| Aug 31, 9:15 AM MDT | Red Flag Warning | BOU | 11 hr |
| Sep 3, 5:42 PM MDT | Special Weather Statement | BOU | 63 min |
| Sep 8, 2:44 PM MDT | Fire Weather Watch | BOU | 13 hr |
| Oct 3, 11:26 AM MDT | Red Flag Warning | BOU | 7 hr |
| Oct 3, 8:26 PM MDT | Freeze Warning | BOU | 13 hr |
| Oct 4, 4:21 PM MDT | Frost Advisory | BOU | 17 hr |
| Oct 4, 4:21 PM MDT | Freeze Watch | BOU | 13 hr |
| Oct 5, 5:03 AM MDT | Freeze Warning | BOU | 29 hr |
| Oct 5, 2:59 PM MDT | Hard Freeze Warning | BOU | 42 hr |
| Oct 16, 3:52 AM MDT | Fire Weather Watch | BOU | 12 hr |
| Oct 16, 3:49 PM MDT | Red Flag Warning | BOU | 26 hr |
| Nov 9, 4:02 AM MST | Winter Weather Advisory | BOU | 49 hr |
| Dec 16, 4:32 AM MST | Dense Fog Advisory | BOU | 4 hr |
| Dec 17, 3:36 PM MST | Winter Storm Watch | BOU | 22 hr |
| Dec 18, 1:56 PM MST | Winter Weather Advisory | BOU | 25 hr |
| Dec 19, 3:13 AM MST | Winter Weather Advisory | BOU | 12 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 | 2 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 10 |
| Special Weather Statement | 13 |
| Flooding | |
| Flash Flood Watch | 3 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 5 |
| Cold | |
| Freeze Warning | 2 |
| Hard Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 3 |
| Fire | |
| Red Flag Warning | 13 |
| Fire Weather Watch | 7 |
| 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 archive20112013
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.