Alert archive / Colorado / San Juan County
Weather alerts in San Juan County, Colorado, 2012
46 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
San Juan County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 46
- Warnings
- 11
- Watches
- 13
- Advisories
- 22
- Busiest month
- February11 alerts
- Busiest day
- February 29, 20123 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
San Juan County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 2 | 0% | |||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: severe thunderstorm warnings | 12 | 2 | 83% | 18 | 11% | 9 min |
| NWS Grand Junction, CO: flash flood warnings | 24 | 4 | 83% | 23 | 26% | 25 min |
| NWS Pueblo, CO: tornado warnings | 24 | 5 | 79% | 9 | 56% | 14 min |
| NWS Pueblo, CO: severe thunderstorm warnings | 121 | 45 | 63% | 127 | 80% | 19 min |
| NWS Pueblo, CO: flash flood warnings | 16 | 2 | 88% | 9 | 67% | 39 min |
| NWS Goodland, KS: tornado warnings | 11 | 1 | 91% | 4 | 25% | 8 min |
| NWS Goodland, KS: severe thunderstorm warnings | 166 | 54 | 67% | 111 | 79% | 21 min |
| NWS Goodland, KS: flash flood warnings | 6 | 1 | 83% | 2 | 50% | 15 min |
| NWS Denver/Boulder, CO: tornado warnings | 24 | 7 | 71% | 17 | 47% | 23 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 95 | 39 | 59% | 128 | 58% | 20 min |
| NWS Denver/Boulder, CO: flash flood warnings | 26 | 7 | 73% | 12 | 50% | 62 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 14, 3:33 PM MST | Winter Weather Advisory | GJT | 56 hr |
| Jan 15, 1:49 PM MST | Winter Storm Warning | GJT | 34 hr |
| Jan 17, 11:49 AM MST | Wind Advisory | GJT | 39 hr |
| Jan 20, 3:48 PM MST | Winter Storm Warning | GJT | 44 hr |
| Jan 23, 4:23 AM MST | Winter Weather Advisory | GJT | 32 hr |
| Feb 1, 4:26 AM MST | Winter Weather Advisory | GJT | 50 hr |
| Feb 6, 1:52 AM MST | Winter Weather Advisory | GJT | 16 hr |
| Feb 10, 3:10 PM MST | Winter Storm Watch | GJT | 23 hr |
| Feb 11, 3:33 AM MST | Winter Storm Warning | GJT | 56 hr |
| Feb 13, 2:43 PM MST | Winter Weather Advisory | GJT | 39 hr |
| Feb 18, 4:21 AM MST | Winter Weather Advisory | GJT | 50 hr |
| Feb 26, 4:16 AM MST | Winter Storm Watch | GJT | 11 hr |
| Feb 26, 3:19 PM MST | Winter Storm Warning | GJT | 57 hr |
| Feb 29, 3:41 AM MST | Winter Storm Watch | GJT | 11 hr |
| Feb 29, 3:41 AM MST | Winter Storm Warning | GJT | 62 hr |
| Feb 29, 3:41 AM MST | Winter Weather Advisory | GJT | 53 hr |
| Mar 6, 3:45 PM MST | Winter Weather Advisory | GJT | 31 hr |
| Mar 16, 4:25 PM MDT | Winter Storm Watch | GJT | 23 hr |
| Mar 17, 3:35 PM MDT | Winter Storm Warning | GJT | 56 hr |
| Mar 25, 3:04 PM MDT | Wind Advisory | GJT | 29 hr |
| Apr 2, 3:32 PM MDT | Winter Weather Advisory | GJT | 21 hr |
| Apr 12, 3:29 PM MDT | Winter Storm Watch | GJT | 11 hr |
| Apr 13, 2:58 AM MDT | Winter Storm Warning | GJT | 3 days |
| May 7, 7:47 PM MDT | Winter Weather Advisory | GJT | 4 hr |
| May 22, 2:26 PM MDT | Wind Advisory | GJT | 32 hr |
| May 24, 9:40 PM MDT | High Wind Watch | GJT | 7 hr |
| May 25, 4:16 AM MDT | High Wind Warning | GJT | 41 hr |
| Jul 7, 3:56 AM MDT | Flash Flood Watch | GJT | 17 hr |
| Aug 9, 2:37 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 22, 8:55 PM MDT | Flash Flood Watch | GJT | 45 hr |
| Aug 23, 3:17 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 23, 5:55 PM MDT | Areal Flood Advisory | GJT | 6 hr |
| Sep 11, 7:57 PM MDT | Flash Flood Watch | GJT | 23 hr |
| Oct 10, 10:54 PM MDT | Winter Storm Watch | GJT | 22 hr |
| Oct 11, 2:45 PM MDT | Winter Weather Advisory | GJT | 45 hr |
| Nov 7, 3:00 PM MST | Winter Storm Watch | GJT | 12 hr |
| Nov 8, 3:23 AM MST | Winter Storm Warning | GJT | 4 days |
| Dec 8, 2:03 PM MST | Winter Weather Advisory | GJT | 25 hr |
| Dec 12, 1:56 PM MST | Winter Storm Watch | GJT | 13 hr |
| Dec 13, 3:24 AM MST | Winter Storm Warning | GJT | 50 hr |
| Dec 13, 3:24 AM MST | Winter Weather Advisory | GJT | 72 hr |
| Dec 15, 2:31 PM MST | Winter Storm Warning | GJT | 4 days |
| Dec 16, 5:15 AM MST | Winter Storm Watch | GJT | 35 hr |
| Dec 22, 6:55 PM MST | Winter Weather Advisory | GJT | 59 hr |
| Dec 25, 2:55 PM MST | Winter Weather Advisory | GJT | 61 hr |
| Dec 29, 3:26 PM MST | Winter Weather Advisory | GJT | 54 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Flooding | |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 10 |
| Winter Storm Watch | 9 |
| Winter Weather Advisory | 16 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20112013
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.