Alert archive / Utah / San Juan County
Weather alerts in San Juan County, Utah, 2016
79 weather alerts in 2016, 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 2016. Tap one for its archive.
- Alerts
- 79
- Warnings
- 25
- Watches
- 20
- Advisories
- 30
- Busiest month
- July16 alerts
- Busiest day
- July 15, 20164 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, 2016
| 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 | 3 | 0% |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: severe thunderstorm warnings | 13 | 3 | 77% | 19 | 26% | 7 min |
| NWS Grand Junction, CO: flash flood warnings | 14 | 1 | 93% | 17 | 6% | 95 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 5, 12:50 AM MST | Winter Weather Advisory | GJT | 8 hr |
| Jan 5, 10:58 AM MST | Winter Storm Watch | GJT | 5 hr |
| Jan 5, 3:30 PM MST | Winter Weather Advisory | GJT | 46 hr |
| Jan 7, 4:51 AM MST | Dense Fog Advisory | GJT | 5 hr |
| Jan 7, 1:31 PM MST | Winter Weather Advisory | GJT | 27 hr |
| Jan 7, 11:15 PM MST | Winter Storm Warning | GJT | 18 hr |
| Jan 13, 4:48 AM MST | Dense Fog Advisory | GJT | 5 hr |
| Jan 28, 10:03 PM MST | Winter Storm Warning | GJT | 5 days |
| Jan 28, 10:03 PM MST | Winter Weather Advisory | GJT | 59 hr |
| Jan 29, 3:07 PM MST | Winter Storm Watch | GJT | 50 hr |
| Jan 30, 4:27 PM MST | Winter Storm Warning | GJT | 68 hr |
| Feb 17, 12:34 PM MST | Wind Advisory | GJT | 32 hr |
| Mar 13, 11:40 PM MDT | Wind Advisory | GJT | 23 hr |
| Mar 22, 3:12 AM MDT | Wind Advisory | GJT | 18 hr |
| Mar 27, 8:48 PM MDT | Winter Weather Advisory | GJT | 60 hr |
| Apr 14, 3:55 AM MDT | Winter Storm Watch | GJT | 9 hr |
| Apr 14, 3:55 AM MDT | Winter Storm Warning | GJT | 3 days |
| Apr 16, 4:30 AM MDT | Wind Advisory | GJT | 8 hr |
| Apr 23, 3:06 AM MDT | Wind Advisory | GJT | 17 hr |
| Apr 25, 2:38 AM MDT | Wind Advisory | GJT | 17 hr |
| Apr 27, 2:27 PM MDT | Winter Weather Advisory | GJT | 55 hr |
| May 19, 2:50 PM MDT | Wind Advisory | GJT | 29 hr |
| May 20, 2:00 PM MDT | Wind Advisory | GJT | 30 hr |
| Jun 26, 2:42 PM MDT | Fire Weather Watch | SLC | 23 hr |
| Jun 27, 1:45 PM MDT | Red Flag Warning | SLC | 32 hr |
| Jun 27, 1:57 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 28, 2:17 PM MDT | Red Flag Warning | SLC | 32 hr |
| Jun 30, 3:16 PM MDT | Flash Flood Watch | GJT | 30 hr |
| Jul 1, 6:20 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 2, 8:48 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 8, 2:27 AM MDT | Red Flag Warning | SLC | 68 hr |
| Jul 8, 9:48 PM MDT | Red Flag Warning | GJT | 50 hr |
| Jul 14, 3:35 PM MDT | Fire Weather Watch | SLC | 11 hr |
| Jul 15, 2:55 AM MDT | Red Flag Warning | SLC | 4 days |
| Jul 15, 3:45 AM MDT | Fire Weather Watch | GJT | 11 hr |
| Jul 15, 2:58 PM MDT | Fire Weather Watch | GJT | 24 hr |
| Jul 15, 2:58 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jul 16, 6:17 PM MDT | Red Flag Warning | GJT | 27 hr |
| Jul 17, 12:12 PM MDT | Fire Weather Watch | GJT | 10 hr |
| Jul 17, 2:48 PM MDT | Red Flag Warning | SLC | 30 hr |
| Jul 17, 9:42 PM MDT | Red Flag Warning | GJT | 24 hr |
| Jul 21, 9:14 PM MDT | Areal Flood Advisory | GJT | 2 hr |
| Jul 22, 5:14 PM MDT | Special Weather Statement | GJT | 46 min |
| Jul 28, 2:49 PM MDT | Red Flag Warning | SLC | 6 days |
| Aug 3, 3:40 AM MDT | Flash Flood Watch | GJT | 20 hr |
| Aug 3, 2:56 PM MDT | Flash Flood Watch | GJT | 29 hr |
| Aug 4, 2:25 PM MDT | Flash Flood Watch | GJT | 34 hr |
| Aug 4, 2:57 PM MDT | Areal Flood Advisory | GJT | 8 hr |
| Aug 4, 7:49 PM MDT | Special Weather Statement | GJT | 41 min |
| Aug 4, 8:33 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 5, 2:23 PM MDT | Flash Flood Watch | GJT | 32 hr |
| Aug 5, 10:00 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 8, 3:31 PM MDT | Areal Flood Advisory | GJT | 5 hr |
| Aug 17, 1:23 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Aug 23, 3:07 AM MDT | Flash Flood Watch | GJT | 19 hr |
| Aug 24, 3:44 PM MDT | Special Weather Statement | GJT | 46 min |
| Sep 3, 1:51 PM MDT | Special Weather Statement | GJT | 39 min |
| Sep 13, 1:41 PM MDT | Severe Thunderstorm Warning | GJT | 34 min |
| Sep 22, 3:19 AM MDT | High Wind Warning | GJT | 20 hr |
| Sep 22, 3:19 AM MDT | Wind Advisory | GJT | 20 hr |
| Sep 22, 10:24 AM MDT | Areal Flood Warning | SLC | 12 hr |
| Sep 22, 5:50 PM MDT | Flash Flood Watch | GJT | 8 hr |
| Sep 29, 9:49 AM MDT | Flash Flood Watch | GJT | 12 hr |
| Oct 16, 2:24 AM MDT | Wind Advisory | GJT | 31 hr |
| Oct 19, 11:51 AM MDT | Freeze Warning | GJT | 21 hr |
| Nov 16, 4:30 AM MST | Winter Weather Advisory | GJT | 44 hr |
| Nov 16, 9:18 PM MST | Freeze Warning | GJT | 36 hr |
| Nov 19, 3:30 PM MST | Winter Storm Watch | GJT | 23 hr |
| Nov 20, 3:55 AM MST | Winter Storm Warning | GJT | 62 hr |
| Nov 25, 2:15 PM MST | Winter Storm Watch | GJT | 14 hr |
| Nov 26, 4:29 AM MST | Winter Storm Warning | GJT | 3 days |
| Nov 26, 4:29 AM MST | Winter Weather Advisory | GJT | 3 days |
| Dec 14, 4:02 PM MST | Winter Storm Watch | GJT | 12 hr |
| Dec 15, 3:45 AM MST | Winter Storm Warning | GJT | 55 hr |
| Dec 21, 3:13 PM MST | Winter Storm Warning | GJT | 41 hr |
| Dec 23, 2:53 AM MST | Winter Storm Watch | GJT | 21 hr |
| Dec 23, 9:00 AM MST | Dense Fog Advisory | GJT | 3 hr |
| Dec 23, 2:26 PM MST | Winter Storm Warning | GJT | 50 hr |
| Dec 31, 10:51 AM MST | Winter Weather Advisory | GJT | 7 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 |
| Special Weather Statement | 4 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Watch | 8 |
| Areal Flood Advisory | 8 |
| Winter | |
| Winter Storm Warning | 9 |
| Winter Storm Watch | 7 |
| Winter Weather Advisory | 9 |
| Cold | |
| Freeze Warning | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 10 |
| Fire | |
| Red Flag Warning | 11 |
| Fire Weather Watch | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20152017
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.