Alert archive / Colorado / Broomfield County
Weather alerts in Broomfield County, Colorado, 2016
74 weather alerts in 2016, 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 2016. Tap one for its archive.
- Alerts
- 74
- Warnings
- 21
- Watches
- 12
- Advisories
- 12
- Busiest month
- July13 alerts
- Busiest day
- May 24, 20163 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, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 4 | 2 | 50% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 30 | 6 | 80% | 20 | 60% | 12 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 259 | 94 | 64% | 230 | 72% | 19 min |
| NWS Denver/Boulder, CO: flash flood warnings | 8 | 1 | 88% | 3 | 33% | 18 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, 3:49 AM MST | Winter Weather Advisory | BOU | 34 hr |
| Jan 9, 8:13 PM MST | Dense Fog Advisory | BOU | 14 hr |
| Jan 30, 3:14 PM MST | Winter Storm Watch | BOU | 20 hr |
| Jan 31, 11:43 AM MST | Winter Storm Warning | BOU | 52 hr |
| Feb 13, 4:17 AM MST | Dense Fog Advisory | BOU | 5 hr |
| Feb 14, 3:01 PM MST | High Wind Watch | BOU | 19 hr |
| Feb 17, 8:38 PM MST | High Wind Watch | BOU | 20 hr |
| Feb 17, 8:38 PM MST | High Wind Warning | BOU | 32 hr |
| Mar 1, 3:44 AM MST | Fire Weather Watch | BOU | 11 hr |
| Mar 1, 2:41 PM MST | Red Flag Warning | BOU | 28 hr |
| Mar 14, 2:32 AM MDT | Red Flag Warning | BOU | 16 hr |
| Mar 17, 3:55 AM MDT | Winter Weather Advisory | BOU | 31 hr |
| Mar 17, 10:57 AM MDT | Winter Storm Warning | BOU | 31 hr |
| Mar 21, 3:27 PM MDT | Winter Storm Watch | BOU | 24 hr |
| Mar 22, 4:48 AM MDT | Winter Weather Advisory | BOU | 37 hr |
| Mar 22, 3:34 PM MDT | Blizzard Warning | BOU | 29 hr |
| Mar 22, 7:30 PM MDT | Winter Storm Warning | BOU | 23 hr |
| Mar 23, 4:33 AM MDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 24, 4:04 AM MDT | Dense Fog Advisory | BOU | 4 hr |
| Apr 14, 6:04 AM MDT | Winter Storm Warning | BOU | 3 days |
| Apr 14, 1:06 PM MDT | Winter Storm Watch | BOU | 16 hr |
| Apr 23, 7:00 PM MDT | Special Weather Statement | BOU | 45 min |
| May 8, 5:04 PM MDT | Special Weather Statement | BOU | 26 min |
| May 10, 3:06 PM MDT | Special Weather Statement | BOU | 24 min |
| May 16, 3:32 AM MDT | Dense Fog Advisory | BOU | 6 hr |
| May 24, 11:31 AM MDT | Mesoscale Discussion | SPC | 59 min |
| May 24, 1:59 PM MDT | Severe Thunderstorm Warning | BOU | 31 min |
| May 24, 2:30 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| Jun 6, 6:17 PM MDT | Severe Thunderstorm Warning | BOU | 28 min |
| Jun 7, 1:37 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 12, 5:44 PM MDT | Special Weather Statement | BOU | 31 min |
| Jun 12, 5:52 PM MDT | Special Weather Statement | BOU | 23 min |
| Jun 13, 11:18 AM MDT | Mesoscale Discussion | SPC | 117 min |
| Jun 13, 3:33 PM MDT | Special Weather Statement | BOU | 42 min |
| Jun 20, 2:38 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 4:00 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jun 27, 6:44 PM MDT | Mesoscale Discussion | SPC | 61 min |
| Jun 28, 5:26 PM MDT | Special Weather Statement | BOU | 49 min |
| Jun 28, 6:01 PM MDT | Severe Thunderstorm Warning | BOU | 44 min |
| Jun 30, 2:13 PM MDT | Flash Flood Watch | BOU | 10 hr |
| Jul 1, 9:57 AM MDT | Flash Flood Watch | BOU | 11 hr |
| Jul 3, 4:00 PM MDT | Special Weather Statement | BOU | 45 min |
| Jul 15, 4:22 PM MDT | Special Weather Statement | BOU | 23 min |
| Jul 17, 2:03 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Jul 23, 5:21 PM MDT | Special Weather Statement | BOU | 54 min |
| Jul 24, 1:50 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 25, 6:50 PM MDT | Special Weather Statement | BOU | 40 min |
| Jul 28, 1:58 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 12:34 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 29, 1:08 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 29, 5:27 PM MDT | Mesoscale Discussion | SPC | 108 min |
| Jul 29, 8:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jul 29, 8:39 PM MDT | Special Weather Statement | BOU | 36 min |
| Aug 7, 5:47 AM MDT | Dense Fog Advisory | BOU | 4 hr |
| Aug 16, 4:56 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Sep 4, 4:05 PM MDT | Special Weather Statement | BOU | 40 min |
| Sep 14, 12:26 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 14, 6:13 PM MDT | Special Weather Statement | BOU | 32 min |
| Sep 22, 3:46 PM MDT | Red Flag Warning | BOU | 28 hr |
| Oct 2, 3:47 PM MDT | Red Flag Warning | BOU | 27 hr |
| Oct 4, 2:56 PM MDT | Freeze Warning | BOU | 18 hr |
| Oct 6, 4:05 AM MDT | Freeze Warning | BOU | 29 hr |
| Oct 15, 2:14 PM MDT | Fire Weather Watch | BOU | 25 hr |
| Oct 15, 2:14 PM MDT | Red Flag Warning | BOU | 29 hr |
| Oct 16, 2:51 PM MDT | Red Flag Warning | BOU | 28 hr |
| Oct 19, 6:00 AM MDT | Freeze Watch | BOU | 8 hr |
| Oct 19, 2:04 PM MDT | Freeze Warning | BOU | 18 hr |
| Oct 30, 3:36 AM MDT | Dense Fog Advisory | BOU | 6 hr |
| Dec 5, 2:48 PM MST | Winter Weather Advisory | BOU | 44 hr |
| Dec 15, 10:21 AM MST | Winter Storm Warning | BOU | 47 hr |
| Dec 16, 12:58 PM MST | Wind Chill Advisory | BOU | 23 hr |
| Dec 16, 9:04 PM MST | Winter Weather Advisory | BOU | 11 hr |
| Dec 23, 2:38 PM MST | High Wind Watch | BOU | 24 hr |
| Dec 24, 2:39 PM MST | High Wind Warning | BOU | 33 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 | 4 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 15 |
| Special Weather Statement | 14 |
| Flooding | |
| Flash Flood Watch | 2 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 5 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 3 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20152017
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.