Alert archive / Colorado / Jefferson County
Weather alerts in Jefferson County, Colorado, 2014
160 weather alerts in 2014, 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 2014. Tap one for its archive.
- Alerts
- 160
- Warnings
- 47
- Watches
- 32
- Advisories
- 55
- Busiest month
- May32 alerts
- Busiest day
- May 25, 20147 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 2 tornado warnings covering Jefferson County in 2014 had a tornado report inside them.
Jefferson County, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 15 | 9 | 40% | 25 | 64% | 17 min |
| Flash flood warnings | 0 | 1 | 0% |
Each office's whole area, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 83 | 23 | 72% | 56 | 63% | 13 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 277 | 94 | 66% | 293 | 63% | 16 min |
| NWS Denver/Boulder, CO: flash flood warnings | 41 | 9 | 78% | 22 | 59% | 33 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 3, 4:10 AM MST | Winter Weather Advisory | BOU | 48 hr |
| Jan 8, 3:21 PM MST | Winter Storm Watch | BOU | 13 hr |
| Jan 9, 4:31 AM MST | Winter Weather Advisory | BOU | 61 hr |
| Jan 9, 9:04 PM MST | High Wind Warning | BOU | 50 hr |
| Jan 11, 4:08 AM MST | Winter Storm Watch | BOU | 9 hr |
| Jan 11, 12:41 PM MST | Winter Storm Warning | BOU | 51 hr |
| Jan 11, 11:13 PM MST | High Wind Warning | BOU | 21 hr |
| Jan 12, 8:09 PM MST | High Wind Warning | BOU | 20 hr |
| Jan 13, 4:06 PM MST | Winter Weather Advisory | BOU | 29 hr |
| Jan 13, 8:06 PM MST | High Wind Warning | BOU | 8 hr |
| Jan 28, 3:14 AM MST | Winter Storm Watch | BOU | 12 hr |
| Jan 28, 3:36 PM MST | Winter Storm Warning | BOU | 61 hr |
| Jan 29, 3:45 AM MST | High Wind Watch | BOU | 9 hr |
| Jan 29, 12:31 PM MST | High Wind Warning | BOU | 16 hr |
| Jan 29, 3:22 PM MST | Winter Storm Watch | BOU | 14 hr |
| Jan 31, 11:08 AM MST | Winter Weather Advisory | BOU | 18 hr |
| Feb 2, 7:17 AM MST | Dense Fog Advisory | BOU | 103 min |
| Feb 5, 12:22 AM MST | Wind Chill Advisory | BOU | 11 hr |
| Feb 5, 2:44 PM MST | Wind Chill Advisory | BOU | 20 hr |
| Feb 6, 3:24 PM MST | Winter Storm Watch | BOU | 15 hr |
| Feb 7, 6:31 AM MST | Winter Storm Warning | BOU | 70 hr |
| Feb 10, 4:24 AM MST | Dense Fog Advisory | BOU | 5 hr |
| Feb 10, 4:34 AM MST | Winter Weather Advisory | BOU | 7 hr |
| Feb 11, 4:02 AM MST | Winter Storm Watch | BOU | 24 hr |
| Feb 11, 7:20 PM MST | High Wind Watch | BOU | 14 hr |
| Feb 12, 3:51 AM MST | Winter Weather Advisory | BOU | 43 hr |
| Feb 12, 9:00 AM MST | High Wind Warning | BOU | 18 hr |
| Feb 13, 4:29 AM MST | High Wind Watch | BOU | 27 hr |
| Feb 14, 7:14 AM MST | High Wind Warning | BOU | 29 hr |
| Feb 14, 4:05 PM MST | Winter Weather Advisory | BOU | 16 hr |
| Feb 16, 4:56 AM MST | Winter Weather Advisory | BOU | 19 hr |
| Feb 16, 4:47 PM MST | High Wind Warning | BOU | 4 hr |
| Feb 16, 8:37 PM MST | High Wind Warning | BOU | 7 hr |
| Feb 17, 4:23 AM MST | High Wind Watch | BOU | 8 hr |
| Feb 17, 12:08 PM MST | High Wind Warning | BOU | 22 hr |
| Feb 18, 2:07 PM MST | Winter Weather Advisory | BOU | 39 hr |
| Feb 20, 6:23 AM MST | High Wind Watch | BOU | 5 hr |
| Feb 20, 6:23 AM MST | High Wind Warning | BOU | 23 hr |
| Feb 23, 11:26 PM MST | Dense Fog Advisory | BOU | 10 hr |
| Feb 27, 3:49 AM MST | Winter Weather Advisory | BOU | 24 hr |
| Feb 28, 4:01 PM MST | Winter Weather Advisory | BOU | 26 hr |
| Mar 4, 2:44 PM MST | Winter Weather Advisory | BOU | 11 hr |
| Mar 6, 4:58 AM MST | Winter Weather Advisory | BOU | 45 hr |
| Mar 7, 5:06 AM MST | Winter Storm Warning | BOU | 21 hr |
| Mar 17, 4:32 AM MDT | Winter Weather Advisory | BOU | 34 hr |
| Mar 26, 4:37 AM MDT | Winter Weather Advisory | BOU | 25 hr |
| Mar 30, 4:25 AM MDT | Winter Weather Advisory | BOU | 30 hr |
| Mar 30, 4:38 AM MDT | High Wind Watch | BOU | 7 hr |
| Mar 30, 11:13 AM MDT | High Wind Warning | BOU | 30 hr |
| Mar 30, 9:49 PM MDT | Special Weather Statement | BOU | 41 min |
| Apr 2, 4:32 AM MDT | Winter Weather Advisory | BOU | 31 hr |
| Apr 3, 12:12 AM MDT | Winter Storm Warning | BOU | 12 hr |
| Apr 11, 2:50 PM MDT | Winter Storm Watch | BOU | 25 hr |
| Apr 12, 3:51 PM MDT | Winter Storm Warning | BOU | 32 hr |
| Apr 12, 3:51 PM MDT | Winter Weather Advisory | BOU | 32 hr |
| Apr 25, 2:20 PM MDT | Winter Storm Watch | BOU | 16 hr |
| Apr 26, 6:01 AM MDT | Winter Storm Warning | BOU | 39 hr |
| Apr 27, 12:34 PM MDT | Winter Weather Advisory | BOU | 8 hr |
| May 7, 12:37 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 7, 7:21 PM MDT | Severe Thunderstorm Warning | BOU | 24 min |
| May 7, 7:44 PM MDT | Severe Thunderstorm Warning | BOU | 31 min |
| May 8, 3:05 PM MDT | Special Weather Statement | BOU | 40 min |
| May 9, 4:30 AM MDT | Winter Storm Watch | BOU | 49 hr |
| May 9, 5:28 AM MDT | Dense Fog Advisory | BOU | 4 hr |
| May 10, 6:00 AM MDT | Winter Storm Warning | BOU | 54 hr |
| May 12, 4:32 AM MDT | Freeze Warning | BOU | 27 hr |
| May 13, 3:14 PM MDT | Freeze Warning | BOU | 16 hr |
| May 20, 2:31 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 20, 2:33 PM MDT | Severe Thunderstorm Warning | BOU | 42 min |
| May 20, 3:15 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| May 20, 4:50 PM MDT | Mesoscale Discussion | SPC | 85 min |
| May 21, 12:34 PM MDT | Tornado Watch | SPC | 8 hr |
| May 21, 1:00 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| May 21, 1:58 PM MDT | Mesoscale Discussion | SPC | 62 min |
| May 22, 12:07 PM MDT | Mesoscale Discussion | SPC | 83 min |
| May 22, 12:34 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 22, 4:43 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| May 22, 5:18 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| May 24, 5:50 AM MDT | Flash Flood Watch | BOU | 17 hr |
| May 24, 5:37 PM MDT | Special Weather Statement | BOU | 23 min |
| May 24, 6:18 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| May 24, 6:25 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| May 24, 6:38 PM MDT | Tornado Warning | BOU | 37 min |
| May 24, 6:57 PM MDT | Tornado Warning | BOU | 33 min |
| May 24, 7:39 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| May 25, 12:38 PM MDT | Special Weather Statement | BOU | 37 min |
| May 25, 3:07 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| May 30, 5:17 AM MDT | Flash Flood Watch | BOU | 15 hr |
| May 31, 6:21 AM MDT | Dense Fog Advisory | BOU | 3 hr |
| May 31, 1:34 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jun 5, 5:00 PM MDT | Severe Thunderstorm Warning | BOU | 30 min |
| Jun 5, 6:37 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jun 12, 1:44 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jun 18, 5:56 PM MDT | Special Weather Statement | BOU | 34 min |
| Jun 23, 1:39 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 23, 4:06 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 23, 4:46 PM MDT | Severe Thunderstorm Warning | BOU | 29 min |
| Jun 24, 1:06 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 25, 1:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 2:07 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jul 3, 5:44 PM MDT | Severe Thunderstorm Warning | BOU | 21 min |
| Jul 3, 6:00 PM MDT | Special Weather Statement | BOU | 45 min |
| Jul 3, 6:23 PM MDT | Severe Thunderstorm Warning | BOU | 21 min |
| Jul 4, 4:54 PM MDT | Special Weather Statement | BOU | 21 min |
| Jul 7, 8:05 PM MDT | Severe Thunderstorm Warning | BOU | 25 min |
| Jul 7, 8:28 PM MDT | Severe Thunderstorm Warning | BOU | 32 min |
| Jul 7, 10:58 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Jul 7, 11:40 PM MDT | Areal Flood Advisory | BOU | 95 min |
| Jul 9, 5:20 PM MDT | Severe Thunderstorm Warning | BOU | 25 min |
| Jul 11, 4:20 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Jul 12, 10:41 AM MDT | Flash Flood Watch | BOU | 10 hr |
| Jul 14, 11:48 AM MDT | Mesoscale Discussion | SPC | 57 min |
| Jul 14, 12:59 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 14, 6:03 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jul 15, 1:29 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 16, 12:33 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jul 16, 2:54 PM MDT | Areal Flood Advisory | BOU | 96 min |
| Jul 23, 4:22 PM MDT | Areal Flood Advisory | BOU | 113 min |
| Jul 24, 12:06 PM MDT | Special Weather Statement | BOU | 39 min |
| Jul 24, 12:31 PM MDT | Areal Flood Advisory | BOU | 119 min |
| Jul 28, 1:37 PM MDT | Flash Flood Watch | BOU | 52 hr |
| Jul 29, 3:08 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 7, 12:11 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Aug 23, 1:07 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Aug 25, 2:37 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Aug 25, 7:43 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Aug 26, 2:11 PM MDT | Severe Thunderstorm Warning | BOU | 18 min |
| Aug 26, 2:30 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Sep 12, 10:22 AM MDT | Frost Advisory | BOU | 21 hr |
| Sep 22, 2:48 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Oct 1, 3:19 AM MDT | Winter Weather Advisory | BOU | 21 hr |
| Oct 2, 2:57 PM MDT | Frost Advisory | BOU | 17 hr |
| Oct 3, 3:27 PM MDT | Frost Advisory | BOU | 18 hr |
| Oct 9, 4:30 AM MDT | Winter Weather Advisory | BOU | 24 hr |
| Oct 11, 2:39 PM MDT | Winter Weather Advisory | BOU | 33 hr |
| Oct 12, 8:05 PM MDT | Frost Advisory | BOU | 12 hr |
| Oct 13, 10:06 AM MDT | Frost Advisory | BOU | 22 hr |
| Oct 26, 3:14 PM MDT | Freeze Watch | BOU | 23 hr |
| Oct 27, 2:21 PM MDT | Freeze Warning | BOU | 18 hr |
| Nov 12, 2:35 AM MST | Winter Weather Advisory | BOU | 15 hr |
| Nov 12, 5:12 PM MST | Wind Chill Advisory | BOU | 16 hr |
| Nov 12, 5:12 PM MST | Winter Weather Advisory | BOU | 35 hr |
| Nov 14, 4:39 AM MST | Winter Weather Advisory | BOU | 38 hr |
| Nov 15, 10:17 AM MST | Winter Storm Warning | BOU | 12 hr |
| Nov 17, 3:30 PM MST | High Wind Watch | BOU | 14 hr |
| Nov 18, 5:46 AM MST | High Wind Warning | BOU | 15 hr |
| Nov 21, 4:06 AM MST | Winter Storm Watch | BOU | 16 hr |
| Nov 21, 7:50 PM MST | Winter Storm Warning | BOU | 69 hr |
| Nov 24, 4:06 AM MST | High Wind Watch | BOU | 12 hr |
| Nov 24, 3:30 PM MST | Winter Weather Advisory | BOU | 45 hr |
| Nov 24, 3:56 PM MST | High Wind Warning | BOU | 29 hr |
| Nov 28, 2:26 PM MST | High Wind Watch | BOU | 20 hr |
| Nov 29, 10:31 AM MST | High Wind Warning | BOU | 17 hr |
| Dec 13, 2:07 PM MST | Winter Weather Advisory | BOU | 39 hr |
| Dec 19, 12:55 PM MST | Winter Storm Watch | BOU | 26 hr |
| Dec 20, 10:12 AM MST | Winter Storm Warning | BOU | 62 hr |
| Dec 24, 5:43 AM MST | Winter Storm Watch | BOU | 9 hr |
| Dec 24, 2:38 PM MST | Winter Storm Warning | BOU | 37 hr |
| Dec 24, 2:38 PM MST | Winter Weather Advisory | BOU | 37 hr |
| Dec 28, 10:36 AM MST | Winter Weather Advisory | BOU | 43 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 | 15 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 18 |
| Special Weather Statement | 8 |
| Flooding | |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 13 |
| Winter | |
| Winter Storm Warning | 12 |
| Winter Storm Watch | 12 |
| Winter Weather Advisory | 29 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 1 |
| Frost Advisory | 5 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 15 |
| High Wind Watch | 9 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20132015
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.