Alert archive / Utah / San Juan County
Weather alerts in San Juan County, Utah, 2025
161 weather alerts in 2025, 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 2025. Tap one for its archive.
- Alerts
- 161
- Warnings
- 72
- Watches
- 32
- Advisories
- 30
- Busiest month
- September42 alerts
- Busiest day
- September 12, 202524 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 5 tornado warnings covering San Juan County in 2025 had a tornado report inside them; 1 of 3 tornado reports fell inside a warning, on average 19 minutes after it went out.
San Juan County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 1 | 80% | 3 | 33% | 19 min |
| Severe thunderstorm warnings | 25 | 2 | 92% | 0 | ||
| Flash flood warnings | 11 | 1 | 91% | 0 |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: tornado warnings | 5 | 1 | 80% | 3 | 33% | 19 min |
| NWS Grand Junction, CO: severe thunderstorm warnings | 72 | 12 | 83% | 35 | 49% | 16 min |
| NWS Grand Junction, CO: flash flood warnings | 44 | 10 | 77% | 31 | 48% | 73 min |
| NWS Salt Lake City, UT: severe thunderstorm warnings | 57 | 22 | 61% | 155 | 25% | 22 min |
| NWS Salt Lake City, UT: flash flood warnings | 45 | 18 | 60% | 49 | 47% | 68 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 8, 1:44 PM MST | Wind Advisory | SLC | 34 hr |
| Jan 20, 1:28 PM MST | Extreme Cold Warning | SLC | 21 hr |
| Feb 12, 2:48 AM MST | Winter Storm Watch | GJT | 24 hr |
| Feb 13, 2:52 AM MST | Winter Storm Warning | GJT | 63 hr |
| Mar 5, 1:48 AM MST | Winter Storm Watch | GJT | 12 hr |
| Mar 5, 1:50 PM MST | Wind Advisory | GJT | 30 hr |
| Mar 5, 1:54 PM MST | Winter Storm Warning | GJT | 49 hr |
| Mar 5, 1:54 PM MST | Winter Weather Advisory | GJT | 45 hr |
| Mar 6, 2:28 AM MST | Wind Advisory | SLC | 18 hr |
| Mar 12, 2:39 AM MDT | Winter Weather Advisory | GJT | 63 hr |
| Mar 12, 2:47 PM MDT | Wind Advisory | GJT | 28 hr |
| Mar 30, 3:00 AM MDT | Wind Advisory | SLC | 45 hr |
| Mar 30, 3:03 AM MDT | Wind Advisory | GJT | 50 hr |
| Mar 31, 3:45 AM MDT | Freeze Watch | GJT | 10 hr |
| Mar 31, 1:42 PM MDT | Freeze Warning | GJT | 42 hr |
| Mar 31, 1:42 PM MDT | Wind Advisory | GJT | 28 hr |
| Apr 1, 1:09 PM MDT | Freeze Watch | GJT | 25 hr |
| Apr 2, 2:08 PM MDT | Winter Weather Advisory | GJT | 34 hr |
| Apr 2, 2:09 PM MDT | Freeze Warning | GJT | 19 hr |
| Apr 3, 1:29 PM MDT | Freeze Warning | GJT | 20 hr |
| Apr 5, 4:10 AM MDT | Freeze Watch | GJT | 9 hr |
| Apr 5, 1:20 PM MDT | Freeze Warning | GJT | 20 hr |
| Apr 16, 2:01 PM MDT | Wind Advisory | GJT | 30 hr |
| Apr 16, 2:44 PM MDT | Winter Weather Advisory | GJT | 3 days |
| Apr 17, 1:53 PM MDT | Freeze Watch | GJT | 37 hr |
| Apr 19, 3:21 AM MDT | Freeze Warning | GJT | 30 hr |
| May 12, 7:32 AM MDT | Wind Advisory | GJT | 37 hr |
| May 12, 2:00 PM MDT | Wind Advisory | SLC | 31 hr |
| May 16, 1:57 AM MDT | Fire Weather Watch | GJT | 11 hr |
| May 16, 1:15 PM MDT | Red Flag Warning | GJT | 31 hr |
| May 21, 2:29 PM MDT | Fire Weather Watch | GJT | 13 hr |
| Jun 3, 1:39 PM MDT | Special Weather Statement | SLC | 51 min |
| Jun 3, 1:42 PM MDT | Severe Thunderstorm Warning | GJT | 48 min |
| Jun 3, 2:23 PM MDT | Special Weather Statement | GJT | 52 min |
| Jun 3, 3:01 PM MDT | Severe Thunderstorm Warning | GJT | 29 min |
| Jun 3, 3:24 PM MDT | Severe Thunderstorm Warning | GJT | 36 min |
| Jun 4, 10:49 AM MDT | Flood Watch | GJT | 13 hr |
| Jun 4, 2:26 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jun 4, 4:23 PM MDT | Flash Flood Warning | GJT | 2 hr |
| Jun 13, 1:51 PM MDT | Fire Weather Watch | SLC | 37 hr |
| Jun 15, 2:15 AM MDT | Fire Weather Watch | GJT | 11 hr |
| Jun 15, 2:27 AM MDT | Red Flag Warning | SLC | 46 hr |
| Jun 15, 1:44 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 17, 2:38 PM MDT | Red Flag Warning | SLC | 4 days |
| Jun 18, 1:48 AM MDT | Fire Weather Watch | GJT | 13 hr |
| Jun 18, 2:17 PM MDT | Heat Advisory | GJT | 34 hr |
| Jun 18, 2:26 PM MDT | Fire Weather Watch | GJT | 11 hr |
| Jun 18, 2:26 PM MDT | Fire Weather Watch | GJT | 23 hr |
| Jun 18, 2:26 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 19, 1:36 AM MDT | Red Flag Warning | GJT | 45 hr |
| Jun 19, 1:34 PM MDT | Wind Advisory | GJT | 32 hr |
| Jun 19, 1:40 PM MDT | Red Flag Warning | GJT | 56 hr |
| Jun 20, 1:41 AM MDT | Fire Weather Watch | GJT | 24 hr |
| Jun 20, 1:29 PM MDT | Wind Advisory | GJT | 33 hr |
| Jun 20, 2:05 PM MDT | Wind Advisory | SLC | 34 hr |
| Jun 21, 1:24 AM MDT | Red Flag Warning | GJT | 44 hr |
| Jul 1, 3:53 PM MDT | Special Weather Statement | GJT | 22 min |
| Jul 2, 2:02 PM MDT | Fire Weather Watch | SLC | 24 hr |
| Jul 3, 1:46 AM MDT | Red Flag Warning | SLC | 43 hr |
| Jul 7, 2:18 PM MDT | Fire Weather Watch | SLC | 23 hr |
| Jul 8, 1:08 PM MDT | Red Flag Warning | SLC | 32 hr |
| Jul 8, 1:37 PM MDT | Fire Weather Watch | GJT | 13 hr |
| Jul 9, 2:11 AM MDT | Red Flag Warning | GJT | 42 hr |
| Jul 13, 2:03 PM MDT | Fire Weather Watch | SLC | 24 hr |
| Jul 14, 2:00 PM MDT | Special Weather Statement | GJT | 15 min |
| Jul 14, 2:28 PM MDT | Red Flag Warning | SLC | 33 hr |
| Jul 24, 2:42 PM MDT | Fire Weather Watch | SLC | 15 hr |
| Jul 25, 2:05 AM MDT | Fire Weather Watch | GJT | 11 hr |
| Jul 25, 5:17 AM MDT | Red Flag Warning | SLC | 9 days |
| Jul 25, 1:04 PM MDT | Red Flag Warning | GJT | 31 hr |
| Aug 1, 1:22 PM MDT | Red Flag Warning | GJT | 30 hr |
| Aug 1, 2:29 PM MDT | Fire Weather Watch | SLC | 23 hr |
| Aug 2, 1:42 PM MDT | Red Flag Warning | SLC | 7 days |
| Aug 5, 2:15 AM MDT | Fire Weather Watch | GJT | 12 hr |
| Aug 5, 2:25 PM MDT | Red Flag Warning | GJT | 54 hr |
| Aug 5, 2:25 PM MDT | Red Flag Warning | GJT | 3 days |
| Aug 7, 1:21 PM MDT | Red Flag Warning | GJT | 55 hr |
| Aug 12, 12:36 PM MDT | Fire Weather Watch | SLC | 25 hr |
| Aug 12, 2:12 PM MDT | Fire Weather Watch | GJT | 23 hr |
| Aug 12, 2:12 PM MDT | Fire Weather Watch | GJT | 48 hr |
| Aug 12, 2:45 PM MDT | Extreme Heat Warning | SLC | 29 hr |
| Aug 13, 1:05 PM MDT | Red Flag Warning | GJT | 31 hr |
| Aug 13, 1:16 PM MDT | Red Flag Warning | SLC | 32 hr |
| Aug 22, 5:26 PM MDT | Flash Flood Warning | GJT | 2 hr |
| Aug 23, 2:44 PM MDT | Flash Flood Warning | GJT | 2 hr |
| Aug 24, 1:41 PM MDT | Areal Flood Advisory | GJT | 89 min |
| Aug 25, 12:58 PM MDT | Areal Flood Advisory | GJT | 2 hr |
| Aug 25, 2:42 PM MDT | Flood Watch | GJT | 35 hr |
| Aug 26, 9:42 AM MDT | Flood Watch | SLC | 13 hr |
| Aug 26, 2:05 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 26, 2:45 PM MDT | Special Weather Statement | GJT | 30 min |
| Aug 26, 3:07 PM MDT | Severe Thunderstorm Warning | GJT | 23 min |
| Aug 26, 3:17 PM MDT | Severe Thunderstorm Warning | GJT | 28 min |
| Aug 26, 3:23 PM MDT | Severe Thunderstorm Warning | GJT | 11 min |
| Aug 26, 3:42 PM MDT | Areal Flood Advisory | GJT | 2 hr |
| Aug 26, 3:53 PM MDT | Special Weather Statement | GJT | 37 min |
| Aug 26, 4:27 PM MDT | Special Weather Statement | GJT | 33 min |
| Aug 26, 4:53 PM MDT | Flash Flood Warning | SLC | 4 hr |
| Aug 26, 5:03 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 26, 5:04 PM MDT | Special Weather Statement | GJT | 26 min |
| Aug 26, 5:39 PM MDT | Areal Flood Warning | GJT | 3 hr |
| Aug 26, 5:52 PM MDT | Special Weather Statement | GJT | 23 min |
| Sep 10, 12:50 PM MDT | Flood Watch | GJT | 59 hr |
| Sep 12, 9:02 AM MDT | Severe Thunderstorm Warning | GJT | 43 min |
| Sep 12, 9:16 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 12, 11:09 AM MDT | Severe Thunderstorm Warning | GJT | 36 min |
| Sep 12, 11:21 AM MDT | Severe Thunderstorm Warning | GJT | 24 min |
| Sep 12, 11:51 AM MDT | Special Weather Statement | GJT | 24 min |
| Sep 12, 12:11 PM MDT | Special Weather Statement | GJT | 34 min |
| Sep 12, 12:18 PM MDT | Severe Thunderstorm Warning | GJT | 27 min |
| Sep 12, 12:25 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Sep 12, 12:33 PM MDT | Special Weather Statement | GJT | 27 min |
| Sep 12, 12:43 PM MDT | Special Weather Statement | GJT | 32 min |
| Sep 12, 12:45 PM MDT | Special Weather Statement | GJT | 30 min |
| Sep 12, 12:51 PM MDT | Severe Thunderstorm Warning | GJT | 24 min |
| Sep 12, 1:02 PM MDT | Severe Thunderstorm Warning | GJT | 28 min |
| Sep 12, 1:08 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Sep 12, 1:20 PM MDT | Severe Thunderstorm Warning | GJT | 11 min |
| Sep 12, 1:24 PM MDT | Areal Flood Advisory | GJT | 2 hr |
| Sep 12, 1:24 PM MDT | Flash Flood Warning | GJT | 2 hr |
| Sep 12, 1:24 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 12, 1:32 PM MDT | Special Weather Statement | GJT | 28 min |
| Sep 12, 1:52 PM MDT | Special Weather Statement | GJT | 23 min |
| Sep 12, 2:05 PM MDT | Severe Thunderstorm Warning | GJT | 15 min |
| Sep 12, 2:14 PM MDT | Special Weather Statement | GJT | 31 min |
| Sep 12, 3:32 PM MDT | Special Weather Statement | GJT | 28 min |
| Sep 12, 5:53 PM MDT | Special Weather Statement | GJT | 37 min |
| Sep 12, 6:28 PM MDT | Special Weather Statement | GJT | 32 min |
| Sep 12, 6:36 PM MDT | Severe Thunderstorm Warning | GJT | 24 min |
| Sep 13, 3:25 AM MDT | Flood Watch | GJT | 21 hr |
| Sep 13, 12:04 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Sep 13, 12:42 PM MDT | Severe Thunderstorm Warning | GJT | 33 min |
| Sep 13, 12:46 PM MDT | Tornado Warning | GJT | 29 min |
| Sep 13, 12:52 PM MDT | Severe Thunderstorm Warning | GJT | 38 min |
| Sep 13, 1:02 PM MDT | Severe Thunderstorm Warning | GJT | 28 min |
| Sep 13, 1:12 PM MDT | Tornado Warning | GJT | 33 min |
| Sep 13, 1:41 PM MDT | Tornado Warning | GJT | 34 min |
| Sep 13, 1:43 PM MDT | Tornado Warning | GJT | 32 min |
| Sep 13, 1:45 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Sep 13, 1:54 PM MDT | Severe Thunderstorm Warning | GJT | 18 min |
| Sep 13, 2:09 PM MDT | Tornado Warning | GJT | 36 min |
| Sep 13, 2:34 PM MDT | Areal Flood Advisory | GJT | 116 min |
| Sep 13, 2:36 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Sep 13, 3:25 PM MDT | Areal Flood Advisory | GJT | 2 hr |
| Oct 8, 1:05 PM MDT | Flood Watch | SLC | 3 days |
| Oct 8, 1:27 PM MDT | Flood Watch | GJT | 4 days |
| Oct 11, 5:13 PM MDT | Severe Thunderstorm Warning | SLC | 62 min |
| Oct 11, 6:05 PM MDT | Severe Thunderstorm Warning | SLC | 25 min |
| Oct 11, 6:28 PM MDT | Severe Thunderstorm Warning | SLC | 17 min |
| Oct 11, 6:34 PM MDT | Severe Thunderstorm Warning | GJT | 41 min |
| Oct 11, 7:37 PM MDT | Special Weather Statement | GJT | 38 min |
| Oct 11, 7:59 PM MDT | Severe Thunderstorm Warning | GJT | 46 min |
| Oct 13, 1:27 PM MDT | Severe Thunderstorm Warning | GJT | 33 min |
| Oct 23, 1:03 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Oct 23, 2:09 PM MDT | Special Weather Statement | GJT | 36 min |
| Oct 23, 2:27 PM MDT | Areal Flood Advisory | GJT | 2 hr |
| Oct 23, 2:51 PM MDT | Special Weather Statement | GJT | 24 min |
| Nov 19, 12:37 AM MST | Winter Weather Advisory | GJT | 46 hr |
| Nov 20, 3:37 AM MST | Dense Fog Advisory | GJT | 4 min |
| Nov 29, 12:23 PM MST | Winter Weather Advisory | GJT | 42 hr |
| Dec 26, 2:04 AM MST | Winter Weather Advisory | GJT | 56 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 | 25 |
| Tornado Warning | 5 |
| Mesoscale Discussion | 4 |
| Special Weather Statement | 23 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 11 |
| Flood Watch | 7 |
| Areal Flood Advisory | 8 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 7 |
| Heat | |
| Extreme Heat Warning | 1 |
| Heat Advisory | 1 |
| Cold | |
| Extreme Cold Warning | 1 |
| Freeze Warning | 5 |
| Freeze Watch | 4 |
| Wind and dust | |
| Wind Advisory | 13 |
| Fire | |
| Red Flag Warning | 21 |
| Fire Weather Watch | 19 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
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.