Alert archive / Utah / San Juan County
Weather alerts in San Juan County, Utah, 2014
92 weather alerts in 2014, 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 2014. Tap one for its archive.
- Alerts
- 92
- Warnings
- 31
- Watches
- 22
- Advisories
- 35
- Busiest month
- August15 alerts
- Busiest day
- August 5, 20145 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, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 1 | 80% | 0 | ||
| Flash flood warnings | 5 | 1 | 80% | 6 | 17% | 23 min |
Each office's whole area, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: tornado warnings | 0 | 1 | 0% | |||
| NWS Grand Junction, CO: severe thunderstorm warnings | 2 | 1 | 50% | 28 | 4% | 1 min |
| NWS Grand Junction, CO: flash flood warnings | 21 | 5 | 76% | 44 | 14% | 82 min |
| NWS Salt Lake City, UT: severe thunderstorm warnings | 43 | 13 | 70% | 89 | 24% | 24 min |
| NWS Salt Lake City, UT: flash flood warnings | 53 | 21 | 60% | 59 | 42% | 70 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 27, 3:42 PM MST | Winter Storm Watch | GJT | 35 hr |
| Jan 28, 3:04 PM MST | Winter Storm Warning | GJT | 4 days |
| Feb 2, 1:15 PM MST | Winter Storm Watch | GJT | 5 hr |
| Feb 2, 5:49 PM MST | Winter Storm Warning | GJT | 53 hr |
| Feb 3, 3:40 AM MST | Winter Weather Advisory | GJT | 43 hr |
| Feb 4, 8:51 PM MST | Winter Storm Watch | GJT | 19 hr |
| Feb 10, 3:25 PM MST | Dense Fog Advisory | GJT | 13 hr |
| Feb 26, 2:13 PM MST | Winter Weather Advisory | GJT | 43 hr |
| Feb 27, 3:37 AM MST | Winter Storm Watch | GJT | 34 hr |
| Feb 28, 5:00 AM MST | Winter Storm Warning | GJT | 59 hr |
| Mar 14, 3:15 PM MDT | Wind Advisory | GJT | 29 hr |
| Mar 16, 3:05 PM MDT | Wind Advisory | GJT | 30 hr |
| Mar 17, 3:31 AM MDT | High Wind Warning | GJT | 17 hr |
| Mar 26, 4:01 AM MDT | Wind Advisory | GJT | 16 hr |
| Mar 29, 10:41 AM MDT | Wind Advisory | GJT | 34 hr |
| Mar 30, 4:08 AM MDT | Blowing Dust Advisory | GJT | 17 hr |
| Mar 31, 2:45 PM MDT | Wind Advisory | GJT | 30 hr |
| Apr 13, 12:33 PM MDT | Special Weather Statement | GJT | 42 min |
| Apr 13, 12:56 PM MDT | Areal Flood Advisory | GJT | 6 hr |
| Apr 21, 3:46 PM MDT | Wind Advisory | GJT | 34 hr |
| Apr 24, 3:31 PM MDT | Winter Storm Watch | GJT | 23 hr |
| Apr 25, 3:00 PM MDT | Winter Weather Advisory | GJT | 54 hr |
| May 6, 10:21 AM MDT | Wind Advisory | GJT | 11 hr |
| May 9, 3:04 AM MDT | Winter Storm Watch | GJT | 19 hr |
| May 9, 9:59 PM MDT | Winter Weather Advisory | GJT | 59 hr |
| May 11, 1:14 PM MDT | Areal Flood Warning | GJT | 9 hr |
| May 23, 1:26 PM MDT | Severe Thunderstorm Warning | SLC | 19 min |
| May 23, 1:47 PM MDT | Severe Thunderstorm Warning | SLC | 28 min |
| May 23, 2:14 PM MDT | Severe Thunderstorm Warning | SLC | 46 min |
| May 23, 2:58 PM MDT | Severe Thunderstorm Warning | SLC | 47 min |
| Jun 11, 1:46 PM MDT | Red Flag Warning | SLC | 56 hr |
| Jun 13, 2:19 PM MDT | Fire Weather Watch | SLC | 24 hr |
| Jun 14, 3:10 AM MDT | Red Flag Warning | SLC | 4 days |
| Jun 16, 3:42 AM MDT | Wind Advisory | GJT | 19 hr |
| Jun 16, 3:18 PM MDT | Wind Advisory | GJT | 30 hr |
| Jun 21, 2:39 AM MDT | Red Flag Warning | SLC | 18 hr |
| Jun 23, 2:40 PM MDT | Fire Weather Watch | SLC | 23 hr |
| Jun 24, 1:36 PM MDT | Red Flag Warning | SLC | 57 hr |
| Jun 26, 10:59 AM MDT | Wind Advisory | GJT | 10 hr |
| Jun 28, 2:51 AM MDT | Fire Weather Watch | SLC | 11 hr |
| Jun 28, 2:51 AM MDT | Red Flag Warning | SLC | 67 hr |
| Jul 2, 3:10 AM MDT | Red Flag Warning | SLC | 21 hr |
| Jul 2, 2:55 PM MDT | Red Flag Warning | SLC | 31 hr |
| Jul 8, 2:27 PM MDT | Flash Flood Watch | GJT | 69 hr |
| Jul 15, 3:56 AM MDT | Flash Flood Watch | GJT | 20 hr |
| Jul 16, 2:48 PM MDT | Areal Flood Advisory | GJT | 117 min |
| Jul 27, 2:14 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 27, 9:09 PM MDT | Flash Flood Watch | GJT | 27 hr |
| Jul 28, 3:55 PM MDT | Flash Flood Watch | GJT | 31 hr |
| Jul 29, 1:39 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Jul 29, 3:15 PM MDT | Areal Flood Advisory | GJT | 4 hr |
| Jul 29, 3:44 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 31, 3:34 PM MDT | Severe Thunderstorm Warning | SLC | 56 min |
| Aug 3, 3:45 AM MDT | Flash Flood Watch | GJT | 20 hr |
| Aug 4, 8:37 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 4, 9:16 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 5, 1:37 AM MDT | Areal Flood Advisory | GJT | 7 hr |
| Aug 5, 2:41 AM MDT | Flash Flood Watch | GJT | 10 hr |
| Aug 5, 4:48 AM MDT | Flash Flood Warning | GJT | 4 hr |
| Aug 12, 2:13 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 12, 2:46 PM MDT | Flash Flood Watch | GJT | 47 hr |
| Aug 13, 6:23 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 13, 9:15 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 14, 1:22 AM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 14, 3:19 PM MDT | Special Weather Statement | GJT | 26 min |
| Aug 25, 9:12 PM MDT | Flash Flood Watch | GJT | 23 hr |
| Aug 27, 2:52 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 27, 3:42 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Sep 7, 3:30 PM MDT | Flash Flood Watch | GJT | 53 hr |
| Sep 9, 8:11 AM MDT | Flash Flood Warning | SLC | 6 hr |
| Sep 9, 10:27 AM MDT | Areal Flood Warning | SLC | 10 hr |
| Sep 27, 2:32 PM MDT | Areal Flood Warning | SLC | 8 hr |
| Sep 27, 2:40 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 27, 3:00 PM MDT | Flash Flood Watch | GJT | 27 hr |
| Sep 27, 6:06 PM MDT | Special Weather Statement | GJT | 39 min |
| Sep 27, 11:48 PM MDT | Areal Flood Warning | SLC | 6 hr |
| Sep 29, 2:21 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Oct 11, 9:55 PM MDT | Wind Advisory | GJT | 21 hr |
| Oct 27, 12:43 PM MDT | Freeze Warning | GJT | 20 hr |
| Nov 1, 3:30 AM MDT | Winter Storm Watch | GJT | 12 hr |
| Nov 1, 3:36 PM MDT | Winter Storm Warning | GJT | 46 hr |
| Nov 2, 2:06 AM MST | Freeze Watch | GJT | 13 hr |
| Nov 2, 2:55 PM MST | Freeze Warning | GJT | 42 hr |
| Nov 12, 3:09 PM MST | Winter Storm Warning | GJT | 4 days |
| Nov 15, 2:49 PM MST | Freeze Warning | GJT | 18 hr |
| Dec 5, 2:30 AM MST | Dense Fog Advisory | GJT | 6 hr |
| Dec 10, 7:19 PM MST | Dense Fog Advisory | GJT | 13 hr |
| Dec 12, 3:36 PM MST | Winter Weather Advisory | GJT | 62 hr |
| Dec 14, 1:23 AM MST | Dense Fog Advisory | GJT | 6 hr |
| Dec 24, 3:13 PM MST | Winter Weather Advisory | GJT | 57 hr |
| Dec 30, 3:21 AM MST | Winter Storm Watch | GJT | 10 hr |
| Dec 30, 1:37 PM MST | Winter Storm Warning | GJT | 58 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 | 5 |
| Mesoscale Discussion | 1 |
| Special Weather Statement | 3 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 5 |
| Flash Flood Watch | 10 |
| Areal Flood Advisory | 13 |
| Winter | |
| Winter Storm Warning | 6 |
| Winter Storm Watch | 8 |
| Winter Weather Advisory | 6 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Blowing Dust Advisory | 1 |
| Wind Advisory | 11 |
| Fire | |
| Red Flag Warning | 7 |
| Fire Weather Watch | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
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.