Alert archive / Colorado / Washington County
Weather alerts in Washington County, Colorado, 2008
144 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Washington County and its neighbors
Each county as a circle sized by its count in 2008. Tap one for its archive.
- Alerts
- 144
- Warnings
- 62
- Watches
- 26
- Advisories
- 21
- Busiest month
- June43 alerts
- Busiest day
- June 4, 200811 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
4 of 15 tornado warnings covering Washington County in 2008 had a tornado report inside them; 3 of 7 tornado reports fell inside a warning, on average 12 minutes after it went out.
Washington County, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 15 | 4 | 73% | 7 | 43% | 12 min |
| Severe thunderstorm warnings | 28 | 8 | 71% | 14 | 50% | 20 min |
| Flash flood warnings | 3 | 0 | 100% | 0 |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 58 | 16 | 72% | 44 | 64% | 13 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 147 | 52 | 65% | 140 | 54% | 20 min |
| NWS Denver/Boulder, CO: flash flood warnings | 14 | 3 | 79% | 7 | 86% | 40 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 |
|---|---|---|---|
| Mar 1, 3:56 PM MST | Snow and Blowing Snow Advisory | BOU | 28 hr |
| Mar 15, 12:14 PM MDT | Winter Storm Watch | BOU | 26 hr |
| Mar 16, 1:47 PM MDT | Snow Advisory | BOU | 5 hr |
| Mar 16, 6:37 PM MDT | Winter Storm Warning | BOU | 14 hr |
| Apr 8, 3:06 PM MDT | Winter Storm Watch | BOU | 22 hr |
| Apr 9, 12:40 PM MDT | Winter Storm Warning | BOU | 33 hr |
| Apr 14, 4:05 AM MDT | Fire Weather Watch | BOU | 11 hr |
| Apr 14, 2:59 PM MDT | Red Flag Warning | BOU | 28 hr |
| Apr 19, 10:17 AM MDT | Red Flag Warning | BOU | 10 hr |
| Apr 19, 8:00 PM MDT | Red Flag Warning | BOU | 24 hr |
| Apr 23, 12:16 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 23, 1:25 PM MDT | Tornado Watch | SPC | 8 hr |
| Apr 28, 3:53 PM MDT | Fire Weather Watch | BOU | 12 hr |
| Apr 29, 4:01 AM MDT | Red Flag Warning | BOU | 16 hr |
| May 1, 3:50 PM MDT | High Wind Watch | BOU | 12 hr |
| May 2, 3:29 AM MDT | High Wind Warning | BOU | 15 hr |
| May 2, 7:42 AM MDT | Blizzard Warning | BOU | 13 hr |
| May 2, 8:36 PM MDT | Freeze Warning | BOU | 12 hr |
| May 9, 12:00 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| May 9, 1:18 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 9, 2:47 PM MDT | Mesoscale Discussion | SPC | 118 min |
| May 10, 2:22 PM MDT | Freeze Warning | BOU | 18 hr |
| May 21, 2:46 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 21, 4:18 PM MDT | Severe Thunderstorm Warning | BOU | 42 min |
| May 21, 5:13 PM MDT | Severe Thunderstorm Warning | BOU | 30 min |
| May 21, 5:33 PM MDT | Mesoscale Discussion | SPC | 57 min |
| May 21, 6:21 PM MDT | Severe Thunderstorm Warning | BOU | 24 min |
| May 21, 7:08 PM MDT | Severe Thunderstorm Warning | BOU | 52 min |
| May 21, 7:40 PM MDT | Mesoscale Discussion | SPC | 65 min |
| May 21, 8:04 PM MDT | Severe Thunderstorm Warning | BOU | 56 min |
| May 22, 11:06 AM MDT | Mesoscale Discussion | SPC | 24 min |
| May 22, 11:25 AM MDT | Tornado Watch | SPC | 9 hr |
| May 22, 12:34 PM MDT | Mesoscale Discussion | SPC | 86 min |
| May 22, 1:00 PM MDT | Tornado Warning | BOU | 30 min |
| May 22, 1:14 PM MDT | Severe Thunderstorm Warning | BOU | 31 min |
| May 22, 4:50 PM MDT | Mesoscale Discussion | SPC | 85 min |
| May 23, 12:41 PM MDT | Tornado Watch | SPC | 6 hr |
| May 23, 5:02 PM MDT | Mesoscale Discussion | SPC | 58 min |
| May 23, 5:37 PM MDT | Mesoscale Discussion | SPC | 23 min |
| May 23, 6:07 PM MDT | Tornado Watch | SPC | 5 hr |
| May 29, 12:33 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 2, 7:52 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 2, 9:31 PM MDT | Tornado Warning | BOU | 44 min |
| Jun 2, 10:18 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jun 2, 10:47 PM MDT | Tornado Warning | BOU | 29 min |
| Jun 3, 1:11 AM MDT | Severe Thunderstorm Warning | BOU | 49 min |
| Jun 3, 1:28 AM MDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 3, 12:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 3, 1:17 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 3, 3:12 PM MDT | Mesoscale Discussion | SPC | 63 min |
| Jun 3, 5:15 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jun 4, 11:54 AM MDT | Mesoscale Discussion | SPC | 96 min |
| Jun 4, 12:42 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 4, 2:11 PM MDT | Tornado Warning | BOU | 35 min |
| Jun 4, 2:26 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Jun 4, 3:26 PM MDT | Tornado Warning | BOU | 35 min |
| Jun 4, 3:59 PM MDT | Tornado Warning | BOU | 46 min |
| Jun 4, 4:36 PM MDT | Tornado Warning | BOU | 39 min |
| Jun 4, 5:08 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jun 4, 5:11 PM MDT | Tornado Warning | BOU | 34 min |
| Jun 4, 5:17 PM MDT | Flash Flood Warning | BOU | 2 hr |
| Jun 4, 5:46 PM MDT | Tornado Warning | BOU | 29 min |
| Jun 4, 6:55 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Jun 5, 4:33 AM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 5, 11:21 AM MDT | Areal Flood Advisory | BOU | 3 hr |
| Jun 5, 3:18 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Jun 17, 5:31 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jun 18, 12:02 PM MDT | Mesoscale Discussion | SPC | 28 min |
| Jun 18, 12:16 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 6:22 PM MDT | Severe Thunderstorm Watch | SPC | 27 hr |
| Jun 20, 2:31 PM MDT | Mesoscale Discussion | SPC | 59 min |
| Jun 20, 3:31 PM MDT | Severe Thunderstorm Warning | BOU | 44 min |
| Jun 20, 6:08 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jun 20, 7:03 PM MDT | Tornado Warning | BOU | 42 min |
| Jun 23, 3:40 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Jun 23, 4:52 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 23, 5:12 PM MDT | Severe Thunderstorm Warning | BOU | 48 min |
| Jun 23, 5:20 PM MDT | Areal Flood Advisory | BOU | 85 min |
| Jun 23, 5:38 PM MDT | Tornado Warning | BOU | 22 min |
| Jun 23, 5:41 PM MDT | Severe Thunderstorm Warning | BOU | 49 min |
| Jun 23, 6:01 PM MDT | Tornado Warning | BOU | 29 min |
| Jun 23, 6:29 PM MDT | Tornado Warning | BOU | 31 min |
| Jun 25, 5:54 PM MDT | Severe Thunderstorm Warning | BOU | 29 min |
| Jun 26, 3:44 PM MDT | Tornado Warning | BOU | 46 min |
| Jul 2, 6:46 PM MDT | Tornado Warning | BOU | 44 min |
| Jul 2, 7:07 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Jul 2, 7:32 PM MDT | Areal Flood Advisory | BOU | 88 min |
| Jul 2, 7:44 PM MDT | Severe Thunderstorm Warning | BOU | 46 min |
| Jul 2, 7:55 PM MDT | Areal Flood Advisory | BOU | 95 min |
| Jul 6, 2:26 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 6:01 PM MDT | Areal Flood Advisory | BOU | 89 min |
| Jul 17, 3:01 PM MDT | Severe Thunderstorm Warning | BOU | 44 min |
| Jul 17, 3:41 PM MDT | Severe Thunderstorm Warning | BOU | 49 min |
| Jul 20, 1:11 PM MDT | Red Flag Warning | BOU | 8 hr |
| Jul 24, 3:17 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Jul 25, 2:54 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 25, 6:12 PM MDT | Mesoscale Discussion | SPC | 63 min |
| Jul 28, 7:38 PM MDT | Areal Flood Advisory | BOU | 82 min |
| Jul 31, 3:55 PM MDT | Heat Advisory | BOU | 29 hr |
| Aug 2, 10:43 AM MDT | Heat Advisory | BOU | 9 hr |
| Aug 3, 5:40 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 6:01 PM MDT | Severe Thunderstorm Warning | BOU | 44 min |
| Aug 3, 6:02 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 6, 2:42 PM MDT | Severe Thunderstorm Warning | BOU | 15 min |
| Aug 6, 7:36 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 6, 8:56 PM MDT | Areal Flood Advisory | BOU | 109 min |
| Aug 6, 9:50 PM MDT | Flash Flood Warning | BOU | 85 min |
| Aug 6, 10:30 PM MDT | Areal Flood Advisory | BOU | 90 min |
| Aug 8, 8:16 PM MDT | Areal Flood Advisory | BOU | 119 min |
| Aug 8, 9:03 PM MDT | Areal Flood Advisory | BOU | 117 min |
| Aug 8, 9:19 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Aug 8, 11:01 PM MDT | Areal Flood Advisory | BOU | 89 min |
| Aug 12, 1:30 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Aug 13, 5:35 PM MDT | Severe Thunderstorm Warning | BOU | 22 min |
| Aug 13, 5:38 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Aug 14, 11:47 AM MDT | Mesoscale Discussion | SPC | 88 min |
| Aug 14, 3:36 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 14, 6:10 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Aug 15, 2:32 PM MDT | Flood Watch | BOU | 32 hr |
| Aug 25, 1:54 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 25, 8:36 PM MDT | Severe Thunderstorm Warning | BOU | 54 min |
| Aug 25, 9:30 PM MDT | Severe Thunderstorm Warning | BOU | 60 min |
| Aug 25, 10:49 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Sep 4, 8:06 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Sep 7, 8:12 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 7, 8:46 PM MDT | Severe Thunderstorm Warning | BOU | 59 min |
| Sep 7, 8:49 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 7, 9:46 PM MDT | Severe Thunderstorm Warning | BOU | 59 min |
| Sep 7, 10:40 PM MDT | Severe Thunderstorm Warning | BOU | 50 min |
| Sep 7, 10:44 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Sep 24, 2:40 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 24, 4:43 PM MDT | Severe Thunderstorm Warning | BOU | 32 min |
| Sep 24, 5:17 PM MDT | Severe Thunderstorm Warning | BOU | 28 min |
| Oct 6, 11:13 AM MDT | Frost Advisory | BOU | 22 hr |
| Oct 13, 2:47 PM MDT | Freeze Warning | BOU | 18 hr |
| Oct 20, 3:10 PM MDT | High Wind Watch | BOU | 13 hr |
| Oct 21, 2:11 PM MDT | High Wind Warning | BOU | 28 hr |
| Oct 21, 2:34 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Nov 6, 1:24 AM MST | High Wind Warning | BOU | 18 hr |
| Nov 10, 10:39 AM MST | Winter Weather Advisory | BOU | 24 hr |
| Nov 14, 1:30 PM MST | High Wind Warning | BOU | 5 hr |
| Nov 30, 4:58 AM MST | High Wind Warning | BOU | 12 hr |
| Dec 14, 12:34 AM MST | Winter Weather Advisory | BOU | 15 hr |
| Dec 23, 11:49 PM MST | Dense Fog Advisory | BOU | 8 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 | 28 |
| Tornado Warning | 15 |
| Severe Thunderstorm Watch | 13 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 35 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flood Watch | 1 |
| Areal Flood Advisory | 13 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Snow Advisory | 1 |
| Snow and Blowing Snow Advisory | 1 |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 3 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 5 |
| High Wind Watch | 2 |
| Fire | |
| Red Flag Warning | 5 |
| Fire Weather Watch | 2 |
| 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 archive20072009
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.