Alert archive / Colorado / Grand County
Weather alerts in Grand County, Colorado, 2014
71 weather alerts in 2014, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Grand County and its neighbors
Each county as a circle sized by its count in 2014. Tap one for its archive.
- Alerts
- 71
- Warnings
- 15
- Watches
- 13
- Advisories
- 40
- Busiest month
- February16 alerts
- Busiest day
- January 28, 20143 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Grand County, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 0 | ||||
| Flash flood warnings | 1 | 0 | 100% | 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 Storm Warning | BOU | 48 hr |
| 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 11, 4:08 AM MST | Winter Storm Watch | BOU | 9 hr |
| Jan 11, 12:41 PM MST | Winter Storm Warning | BOU | 51 hr |
| Jan 12, 3:22 AM MST | Winter Weather Advisory | BOU | 17 hr |
| Jan 13, 4:06 PM MST | Winter Weather Advisory | BOU | 29 hr |
| Jan 28, 3:14 AM MST | Winter Storm Watch | BOU | 12 hr |
| Jan 28, 3:36 PM MST | Winter Storm Watch | BOU | 14 hr |
| Jan 28, 3:36 PM MST | Winter Storm Warning | BOU | 61 hr |
| Jan 31, 11:08 AM MST | Winter Weather Advisory | BOU | 18 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 7, 4:00 PM MST | Winter Weather Advisory | BOU | 52 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 12, 3:51 AM MST | Winter Weather Advisory | BOU | 43 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 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 Warning | BOU | 23 hr |
| Feb 22, 9:51 AM MST | Winter Weather Advisory | BOU | 20 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 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 |
| 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 26, 6:01 AM MDT | Winter Weather Advisory | BOU | 23 hr |
| Apr 27, 4:42 AM MDT | Winter Weather Advisory | BOU | 8 hr |
| Apr 27, 12:34 PM MDT | Winter Weather Advisory | BOU | 8 hr |
| May 5, 5:42 PM MDT | Areal Flood Advisory | BOU | 48 hr |
| May 9, 4:30 AM MDT | Winter Storm Watch | BOU | 49 hr |
| May 10, 6:00 AM MDT | Winter Storm Warning | BOU | 54 hr |
| May 24, 4:42 PM MDT | Special Weather Statement | BOU | 33 min |
| May 25, 9:48 AM MDT | Areal Flood Advisory | BOU | 6 days |
| May 30, 9:16 PM MDT | Areal Flood Advisory | BOU | 60 hr |
| Jun 2, 9:29 AM MDT | Areal Flood Advisory | BOU | 60 hr |
| Jun 4, 9:33 PM MDT | Areal Flood Advisory | BOU | 4 days |
| Jun 25, 1:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 1:29 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 28, 1:22 PM MDT | Flash Flood Warning | BOU | 3 hr |
| Jul 28, 1:37 PM MDT | Flash Flood Watch | BOU | 52 hr |
| Jul 30, 1:53 AM MDT | Areal Flood Advisory | BOU | 112 min |
| Oct 1, 3:19 AM MDT | Winter Weather Advisory | BOU | 21 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 |
| Nov 2, 5:49 AM MST | Winter Weather Advisory | BOU | 31 hr |
| Nov 12, 2:35 AM MST | Winter Weather Advisory | BOU | 15 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 21, 4:06 AM MST | Winter Storm Watch | BOU | 16 hr |
| Nov 21, 7:50 PM MST | Winter Storm Warning | BOU | 69 hr |
| Nov 22, 10:25 AM MST | Winter Weather Advisory | BOU | 23 hr |
| Nov 24, 3:30 PM MST | Winter Weather Advisory | BOU | 45 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, 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 | |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 1 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Storm Warning | 11 |
| Winter Storm Watch | 11 |
| Winter Weather Advisory | 34 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
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.