Alert archive / Colorado / Grand County
Weather alerts in Grand County, Colorado, 2013
59 weather alerts in 2013, 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 2013. Tap one for its archive.
- Alerts
- 59
- Warnings
- 18
- Watches
- 10
- Advisories
- 29
- Busiest month
- April16 alerts
- Busiest day
- March 8, 20132 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, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 0 | 100% | 0 | ||
| Flash flood warnings | 0 | 0 |
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 10, 5:02 AM MST | Winter Weather Advisory | BOU | 35 hr |
| Jan 27, 2:47 PM MST | Winter Weather Advisory | BOU | 27 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 20, 4:17 AM MST | Winter Weather Advisory | BOU | 30 hr |
| Feb 23, 3:41 PM MST | Winter Weather Advisory | BOU | 25 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 8, 4:14 AM MST | Winter Weather Advisory | BOU | 43 hr |
| Mar 16, 3:38 PM MDT | Winter Weather Advisory | BOU | 26 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, 5:44 AM MDT | Winter Storm Warning | BOU | 38 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 |
| Apr 30, 12:12 PM MDT | Winter Weather Advisory | BOU | 39 hr |
| May 8, 3:55 AM MDT | Winter Weather Advisory | BOU | 36 hr |
| May 19, 3:42 PM MDT | Winter Weather Advisory | BOU | 18 hr |
| Jun 12, 1:52 PM MDT | Red Flag Warning | BOU | 31 hr |
| Jun 16, 5:21 PM MDT | Special Weather Statement | BOU | 24 min |
| Jun 19, 3:55 AM MDT | Red Flag Warning | BOU | 16 hr |
| Jun 19, 2:12 PM MDT | Red Flag Warning | BOU | 30 hr |
| Jun 21, 5:04 AM MDT | Red Flag Warning | BOU | 15 hr |
| Jun 21, 3:35 PM MDT | Red Flag Warning | BOU | 28 hr |
| Jun 23, 3:05 PM MDT | Fire Weather Watch | BOU | 14 hr |
| Jun 24, 5:01 AM MDT | Red Flag Warning | BOU | 15 hr |
| Jun 30, 3:52 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Jul 17, 2:50 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Aug 23, 4:11 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 28, 3:20 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Sep 14, 4:30 AM MDT | Flash Flood Watch | BOU | 40 hr |
| Oct 2, 4:01 AM MDT | Winter Storm Watch | BOU | 35 hr |
| Oct 3, 3:54 AM MDT | Winter Storm Warning | BOU | 38 hr |
| Oct 3, 3:14 PM MDT | Winter Weather Advisory | BOU | 27 hr |
| Oct 10, 3:42 AM MDT | Winter Weather Advisory | BOU | 32 hr |
| Oct 13, 4:56 AM MDT | Winter Weather Advisory | BOU | 37 hr |
| Oct 16, 3:42 PM MDT | Winter Weather Advisory | BOU | 41 hr |
| Nov 4, 3:50 AM MST | Winter Weather Advisory | BOU | 31 hr |
| Nov 15, 3:46 PM MST | Winter Storm Warning | BOU | 43 hr |
| Nov 15, 3:46 PM MST | Winter Weather Advisory | BOU | 43 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 4, 11:49 AM MST | Winter Weather Advisory | BOU | 3 hr |
| Dec 21, 3:26 AM MST | Winter Weather Advisory | BOU | 12 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 | 1 |
| Mesoscale Discussion | 1 |
| Special Weather Statement | 1 |
| Flooding | |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 10 |
| Winter Storm Watch | 8 |
| Winter Weather Advisory | 27 |
| Wind and dust | |
| High Wind Warning | 1 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 1 |
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.