Alert archive / Colorado / Adams County
Weather alerts in Adams County, Colorado, 2017
108 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Adams County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 108
- Warnings
- 36
- Watches
- 18
- Advisories
- 18
- Busiest month
- May27 alerts
- Busiest day
- May 8, 20179 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 1 tornado warnings covering Adams County in 2017 had a tornado report inside them.
Adams County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 12 | 5 | 58% | 6 | 100% | 15 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 18 | 3 | 83% | 15 | 33% | 8 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 145 | 51 | 65% | 143 | 65% | 17 min |
| NWS Denver/Boulder, CO: flash flood warnings | 9 | 2 | 78% | 4 | 50% | 22 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, 5:08 AM MST | Winter Storm Warning | BOU | 54 hr |
| Jan 4, 4:48 PM MST | Winter Weather Advisory | BOU | 18 hr |
| Jan 12, 3:26 PM MST | Winter Weather Advisory | BOU | 3 hr |
| Jan 24, 11:45 AM MST | Freezing Fog Advisory | BOU | 2 hr |
| Feb 1, 1:44 PM MST | Winter Weather Advisory | BOU | 19 hr |
| Feb 20, 3:49 AM MST | Fire Weather Watch | BOU | 11 hr |
| Feb 20, 2:28 PM MST | Red Flag Warning | BOU | 28 hr |
| Mar 3, 3:14 PM MST | Fire Weather Watch | BOU | 24 hr |
| Mar 4, 3:26 PM MST | Fire Weather Watch | BOU | 13 hr |
| Mar 4, 3:26 PM MST | Red Flag Warning | BOU | 28 hr |
| Mar 5, 4:02 AM MST | Red Flag Warning | BOU | 38 hr |
| Mar 5, 4:02 AM MST | High Wind Watch | BOU | 10 hr |
| Mar 5, 2:28 PM MST | High Wind Warning | BOU | 29 hr |
| Mar 6, 5:44 AM MST | Fire Weather Watch | BOU | 10 hr |
| Mar 6, 3:35 PM MST | Red Flag Warning | BOU | 25 hr |
| Mar 9, 3:12 AM MST | Red Flag Warning | BOU | 15 hr |
| Mar 11, 4:29 AM MST | Fire Weather Watch | BOU | 8 hr |
| Mar 11, 12:56 PM MST | Red Flag Warning | BOU | 28 hr |
| Mar 15, 12:41 PM MDT | Red Flag Warning | BOU | 6 hr |
| Mar 15, 2:15 PM MDT | Fire Weather Watch | BOU | 17 hr |
| Mar 15, 9:29 PM MDT | Red Flag Warning | BOU | 22 hr |
| Mar 17, 4:49 PM MDT | Fire Weather Watch | BOU | 35 hr |
| Mar 18, 3:49 AM MDT | Red Flag Warning | BOU | 39 hr |
| Mar 22, 3:57 AM MDT | Fire Weather Watch | BOU | 7 hr |
| Mar 22, 10:47 AM MDT | Red Flag Warning | BOU | 31 hr |
| Mar 23, 5:00 AM MDT | Blizzard Watch | BOU | 10 hr |
| Mar 23, 5:00 AM MDT | Winter Weather Advisory | BOU | 29 hr |
| Mar 23, 3:28 PM MDT | Blizzard Warning | BOU | 21 hr |
| Apr 15, 3:00 PM MDT | Fire Weather Watch | BOU | 24 hr |
| Apr 28, 4:49 AM MDT | Winter Storm Warning | BOU | 37 hr |
| Apr 28, 4:49 AM MDT | Winter Weather Advisory | BOU | 24 hr |
| Apr 29, 3:25 PM MDT | Freeze Warning | BOU | 17 hr |
| May 3, 4:17 AM MDT | Frost Advisory | BOU | 27 hr |
| May 7, 3:41 PM MDT | Severe Thunderstorm Warning | BOU | 34 min |
| May 7, 4:15 PM MDT | Special Weather Statement | BOU | 45 min |
| May 8, 12:01 PM MDT | Mesoscale Discussion | SPC | 89 min |
| May 8, 12:35 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 8, 2:45 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| May 8, 2:59 PM MDT | Mesoscale Discussion | SPC | 91 min |
| May 8, 3:21 PM MDT | Severe Thunderstorm Warning | BOU | 39 min |
| May 8, 3:25 PM MDT | Severe Thunderstorm Warning | BOU | 50 min |
| May 8, 3:33 PM MDT | Areal Flood Advisory | BOU | 57 min |
| May 8, 4:18 PM MDT | Special Weather Statement | BOU | 42 min |
| May 8, 4:46 PM MDT | Areal Flood Advisory | BOU | 89 min |
| May 8, 6:18 PM MDT | Mesoscale Discussion | SPC | 87 min |
| May 16, 1:16 PM MDT | Mesoscale Discussion | SPC | 119 min |
| May 17, 4:41 AM MDT | Winter Storm Warning | BOU | 53 hr |
| May 17, 11:40 AM MDT | Winter Storm Watch | BOU | 23 hr |
| May 19, 4:01 AM MDT | Freeze Warning | BOU | 28 hr |
| May 25, 7:13 PM MDT | Special Weather Statement | BOU | 47 min |
| May 25, 7:17 PM MDT | Special Weather Statement | BOU | 43 min |
| May 26, 11:43 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 26, 1:00 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 26, 2:01 PM MDT | Special Weather Statement | BOU | 59 min |
| May 26, 2:32 PM MDT | Special Weather Statement | BOU | 43 min |
| May 26, 2:38 PM MDT | Mesoscale Discussion | SPC | 97 min |
| May 26, 3:14 PM MDT | Severe Thunderstorm Warning | BOU | 46 min |
| May 26, 5:14 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 26, 7:15 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jun 5, 2:51 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jun 5, 3:00 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| Jun 7, 2:12 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 7, 5:04 PM MDT | Special Weather Statement | BOU | 41 min |
| Jun 11, 2:49 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 12:12 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 3:07 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jun 29, 6:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 2, 2:56 PM MDT | Special Weather Statement | BOU | 19 min |
| Jul 2, 3:19 PM MDT | Special Weather Statement | BOU | 41 min |
| Jul 2, 3:48 PM MDT | Special Weather Statement | BOU | 42 min |
| Jul 3, 2:01 PM MDT | Special Weather Statement | BOU | 44 min |
| Jul 3, 2:30 PM MDT | Special Weather Statement | BOU | 45 min |
| Jul 3, 3:31 PM MDT | Special Weather Statement | BOU | 44 min |
| Jul 4, 4:45 PM MDT | Severe Thunderstorm Warning | BOU | 37 min |
| Jul 15, 4:09 PM MDT | Special Weather Statement | BOU | 36 min |
| Jul 20, 2:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 30, 5:28 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Jul 30, 5:46 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Jul 30, 5:56 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Aug 4, 2:48 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Aug 4, 8:17 PM MDT | Special Weather Statement | BOU | 43 min |
| Aug 8, 6:18 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 10, 3:18 PM MDT | Severe Thunderstorm Warning | BOU | 42 min |
| Aug 10, 3:52 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 10, 4:13 PM MDT | Severe Thunderstorm Warning | BOU | 47 min |
| Aug 10, 4:48 PM MDT | Tornado Warning | BOU | 27 min |
| Aug 12, 4:59 PM MDT | Severe Thunderstorm Warning | BOU | 31 min |
| Aug 12, 5:04 PM MDT | Areal Flood Advisory | BOU | 116 min |
| Aug 13, 3:12 PM MDT | Severe Thunderstorm Warning | BOU | 22 min |
| Aug 15, 7:41 PM MDT | Special Weather Statement | BOU | 49 min |
| Sep 14, 5:20 PM MDT | Special Weather Statement | BOU | 40 min |
| Sep 17, 4:36 PM MDT | Severe Thunderstorm Warning | BOU | 26 min |
| Sep 17, 5:11 PM MDT | Special Weather Statement | BOU | 49 min |
| Sep 18, 10:47 AM MDT | Fire Weather Watch | BOU | 16 hr |
| Sep 18, 10:47 AM MDT | Red Flag Warning | BOU | 33 hr |
| Sep 20, 5:07 AM MDT | Fire Weather Watch | BOU | 8 hr |
| Sep 20, 1:20 PM MDT | Red Flag Warning | BOU | 30 hr |
| Sep 22, 4:58 AM MDT | Red Flag Warning | BOU | 14 hr |
| Oct 2, 8:14 PM MDT | Frost Advisory | BOU | 13 hr |
| Oct 5, 2:19 AM MDT | Dense Fog Advisory | BOU | 7 hr |
| Oct 6, 4:03 PM MDT | Special Weather Statement | BOU | 57 min |
| Oct 6, 4:32 PM MDT | Special Weather Statement | BOU | 58 min |
| Oct 7, 4:53 AM MDT | Winter Storm Watch | BOU | 23 hr |
| Oct 8, 4:14 AM MDT | Winter Storm Warning | BOU | 35 hr |
| Oct 8, 4:14 AM MDT | Winter Weather Advisory | BOU | 35 hr |
| Oct 8, 4:18 AM MDT | Freeze Warning | BOU | 54 hr |
| Nov 6, 6:37 AM MST | Dense Fog Advisory | BOU | 3 hr |
| Dec 7, 2:31 PM MST | Red Flag Warning | BOU | 26 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 | 12 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 16 |
| Special Weather Statement | 20 |
| Flooding | |
| Areal Flood Advisory | 7 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 4 |
| Blizzard Watch | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 6 |
| Cold | |
| Freeze Warning | 3 |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Fire | |
| Red Flag Warning | 14 |
| Fire Weather Watch | 11 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.