Alert archive / Colorado / Jefferson County
Weather alerts in Jefferson County, Colorado, 2013
136 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2013. Tap one for its archive.
- Alerts
- 136
- Warnings
- 51
- Watches
- 23
- Advisories
- 43
- Busiest month
- September30 alerts
- Busiest day
- September 13, 20139 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Jefferson County, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 2 | 60% | 2 | 0% | |
| Flash flood warnings | 12 | 4 | 67% | 1 | 100% | 39 min |
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 |
|---|---|---|---|
| Jan 23, 3:07 PM MST | Red Flag Warning | BOU | 25 hr |
| Jan 28, 3:37 AM MST | Winter Storm Watch | BOU | 24 hr |
| Jan 29, 3:10 AM MST | Winter Storm Warning | BOU | 60 hr |
| Feb 8, 3:18 PM MST | Winter Weather Advisory | BOU | 38 hr |
| Feb 17, 1:05 PM MST | Red Flag Warning | BOU | 5 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 23, 3:41 PM MST | Winter Weather Advisory | BOU | 25 hr |
| Feb 24, 5:44 AM MST | Mesoscale Discussion | SPC | 4 hr |
| Mar 3, 4:11 AM MST | Winter Weather Advisory | BOU | 32 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 16, 3:38 PM MDT | Winter Weather Advisory | BOU | 26 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 11, 3:32 AM MDT | Winter Weather Advisory | BOU | 14 hr |
| Apr 12, 3:55 PM MDT | Winter Weather Advisory | BOU | 43 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 21, 2:55 PM MDT | Winter Storm Watch | BOU | 15 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 |
| May 8, 3:55 AM MDT | Winter Weather Advisory | BOU | 36 hr |
| May 26, 2:49 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Jun 9, 3:13 PM MDT | Fire Weather Watch | BOU | 21 hr |
| Jun 9, 3:13 PM MDT | Fire Weather Watch | BOU | 21 hr |
| Jun 10, 12:10 PM MDT | Red Flag Warning | BOU | 9 hr |
| Jun 10, 12:10 PM MDT | Red Flag Warning | BOU | 33 hr |
| Jun 12, 1:52 PM MDT | Red Flag Warning | BOU | 31 hr |
| Jun 13, 1:14 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jun 16, 6:55 PM MDT | Special Weather Statement | BOU | 50 min |
| Jun 17, 2:21 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 21, 3:35 PM MDT | Red Flag Warning | BOU | 28 hr |
| Jun 23, 4:56 PM MDT | Special Weather Statement | BOU | 19 min |
| Jun 24, 5:01 AM MDT | Red Flag Warning | BOU | 15 hr |
| Jun 24, 2:32 PM MDT | Red Flag Warning | BOU | 27 hr |
| Jun 28, 1:54 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 28, 9:32 PM MDT | Severe Thunderstorm Warning | BOU | 28 min |
| Jun 28, 9:52 PM MDT | Severe Thunderstorm Warning | BOU | 23 min |
| Jun 29, 12:44 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 1, 6:23 PM MDT | Special Weather Statement | BOU | 37 min |
| Jul 3, 7:11 PM MDT | Special Weather Statement | BOU | 34 min |
| Jul 10, 12:21 PM MDT | Special Weather Statement | BOU | 39 min |
| Jul 10, 1:29 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 13, 4:58 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Jul 13, 5:20 PM MDT | Areal Flood Advisory | BOU | 115 min |
| Jul 13, 5:52 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Jul 14, 4:45 AM MDT | Flash Flood Watch | BOU | 19 hr |
| Jul 14, 9:38 PM MDT | Areal Flood Advisory | BOU | 112 min |
| Jul 15, 1:34 PM MDT | Areal Flood Advisory | BOU | 116 min |
| Jul 15, 2:27 PM MDT | Areal Flood Advisory | BOU | 78 min |
| Jul 19, 4:19 AM MDT | Flash Flood Watch | BOU | 12 hr |
| Jul 27, 2:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 3, 2:35 PM MDT | Tornado Watch | SPC | 6 hr |
| Aug 3, 6:29 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Aug 9, 3:36 PM MDT | Special Weather Statement | BOU | 39 min |
| Aug 9, 3:43 PM MDT | Severe Thunderstorm Warning | BOU | 47 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 22, 5:45 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| 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, 6:06 PM MDT | Flash Flood Warning | BOU | 114 min |
| Aug 23, 3:19 PM MDT | Special Weather Statement | BOU | 56 min |
| Aug 23, 3:41 PM MDT | Special Weather Statement | BOU | 34 min |
| Aug 23, 6:22 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Aug 27, 2:50 PM MDT | Special Weather Statement | BOU | 40 min |
| Sep 4, 4:09 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Sep 9, 3:11 PM MDT | Areal Flood Advisory | BOU | 94 min |
| Sep 11, 3:10 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Sep 11, 4:06 PM MDT | Areal Flood Advisory | BOU | 114 min |
| Sep 11, 9:46 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 11, 11:16 PM MDT | Flash Flood Warning | BOU | 5 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, 3:29 PM MDT | Flash Flood Warning | BOU | 8 hr |
| Sep 12, 7:23 PM MDT | Flash Flood Warning | BOU | 6 hr |
| Sep 12, 7:35 PM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 12, 10:52 PM MDT | Flash Flood Warning | BOU | 5 hr |
| Sep 12, 11:38 PM MDT | River Flood Warning | BOU | 8 hr |
| Sep 12, 11:58 PM MDT | Flash Flood Warning | BOU | 6 hr |
| Sep 13, 12:07 AM MDT | River Flood Warning | BOU | 24 hr |
| Sep 13, 12:09 AM 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, 7:50 AM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 14, 12:50 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 14, 4:39 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 14, 5:57 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 15, 9:10 AM MDT | Areal Flood Warning | BOU | 12 hr |
| Sep 15, 12:08 PM MDT | Areal Flood Warning | BOU | 9 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 27, 4:13 AM MDT | Frost Advisory | BOU | 28 hr |
| Oct 3, 10:27 AM MDT | Freeze Watch | BOU | 20 hr |
| Oct 3, 3:14 PM MDT | Winter Weather Advisory | BOU | 27 hr |
| Oct 4, 6:06 AM MDT | Freeze Warning | BOU | 27 hr |
| Oct 10, 3:42 AM MDT | Winter Weather Advisory | BOU | 32 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 16, 3:42 PM MDT | Winter Weather Advisory | BOU | 41 hr |
| Oct 21, 2:05 AM MDT | Dense Fog Advisory | BOU | 7 hr |
| Oct 28, 4:52 PM MDT | Winter Weather Advisory | BOU | 16 hr |
| Oct 31, 8:57 PM MDT | High Wind Warning | BOU | 5 hr |
| Nov 4, 3:50 AM MST | Winter Weather Advisory | BOU | 31 hr |
| Nov 15, 4:43 AM MST | High Wind Watch | BOU | 31 hr |
| Nov 15, 3:46 PM MST | Winter Weather Advisory | BOU | 43 hr |
| Nov 16, 11:16 AM MST | High Wind Warning | BOU | 28 hr |
| Nov 20, 3:07 PM MST | Winter Weather Advisory | BOU | 25 hr |
| Dec 1, 3:56 AM MST | High Wind Watch | BOU | 11 hr |
| Dec 1, 2:26 PM MST | High Wind Warning | BOU | 28 hr |
| Dec 2, 4:16 AM MST | Winter Storm Watch | BOU | 11 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 4, 11:49 AM MST | Winter Weather Advisory | BOU | 3 hr |
| Dec 10, 5:20 PM MST | High Wind Warning | BOU | 4 hr |
| Dec 10, 8:03 PM MST | Areal Flood Advisory | BOU | 12 hr |
| Dec 21, 3:26 AM MST | Winter Weather Advisory | BOU | 12 hr |
| Dec 21, 5:15 AM MST | Dense Fog Advisory | BOU | 5 hr |
| Dec 22, 2:37 PM MST | Winter Weather Advisory | BOU | 20 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 | 5 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 9 |
| Special Weather Statement | 10 |
| Flooding | |
| Areal Flood Warning | 6 |
| Flash Flood Warning | 12 |
| River Flood Warning | 2 |
| Flash Flood Watch | 5 |
| Areal Flood Advisory | 17 |
| Winter | |
| Winter Storm Warning | 9 |
| Winter Storm Watch | 9 |
| Winter Weather Advisory | 23 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 5 |
| High Wind Watch | 3 |
| Fire | |
| Red Flag Warning | 9 |
| Fire Weather Watch | 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.