Alert archive / Utah / Grand County
Weather alerts in Grand County, Utah, 2024
173 weather alerts in 2024, 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 2024. Tap one for its archive.
- Alerts
- 173
- Warnings
- 57
- Watches
- 25
- Advisories
- 29
- Busiest month
- August70 alerts
- Busiest day
- August 25, 202416 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, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 20 | 6 | 70% | 12 | 58% | 16 min |
| Flash flood warnings | 17 | 2 | 88% | 5 | 80% | 48 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: tornado warnings | 0 | 2 | 0% | |||
| NWS Grand Junction, CO: severe thunderstorm warnings | 90 | 9 | 90% | 42 | 26% | 12 min |
| NWS Grand Junction, CO: flash flood warnings | 57 | 8 | 86% | 42 | 26% | 43 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, 1:58 PM MST | Winter Storm Watch | GJT | 13 hr |
| Jan 6, 3:21 AM MST | Winter Storm Warning | GJT | 53 hr |
| Jan 6, 3:21 AM MST | Winter Weather Advisory | GJT | 56 hr |
| Jan 10, 1:12 PM MST | Winter Weather Advisory | GJT | 28 hr |
| Jan 12, 2:47 PM MST | Winter Storm Watch | GJT | 24 hr |
| Jan 13, 2:22 PM MST | Winter Weather Advisory | GJT | 40 hr |
| Jan 24, 1:10 PM MST | Winter Weather Advisory | GJT | 40 hr |
| Jan 30, 1:20 PM MST | Winter Storm Watch | GJT | 49 hr |
| Feb 1, 2:07 AM MST | Winter Storm Warning | GJT | 3 days |
| Feb 1, 2:07 AM MST | Winter Weather Advisory | GJT | 3 days |
| Feb 5, 1:56 AM MST | Winter Storm Watch | GJT | 13 hr |
| Feb 5, 3:19 PM MST | Winter Storm Warning | GJT | 71 hr |
| Feb 6, 3:04 PM MST | Winter Weather Advisory | GJT | 3 days |
| Feb 26, 2:18 AM MST | Winter Weather Advisory | GJT | 37 hr |
| Feb 29, 1:37 PM MST | Wind Advisory | GJT | 63 hr |
| Mar 1, 2:31 PM MST | High Wind Warning | GJT | 36 hr |
| Mar 1, 2:39 PM MST | Winter Weather Advisory | GJT | 56 hr |
| Mar 11, 1:42 PM MDT | Winter Weather Advisory | GJT | 64 hr |
| Mar 12, 2:37 PM MDT | Winter Storm Watch | GJT | 13 hr |
| Mar 13, 3:22 AM MDT | Winter Storm Warning | GJT | 3 days |
| Mar 15, 2:23 PM MDT | Winter Weather Advisory | GJT | 43 hr |
| Mar 23, 3:07 AM MDT | Winter Weather Advisory | GJT | 51 hr |
| Apr 3, 1:29 PM MDT | High Wind Watch | GJT | 25 hr |
| Apr 4, 2:24 PM MDT | High Wind Warning | GJT | 30 hr |
| Apr 5, 2:24 PM MDT | Freeze Watch | GJT | 24 hr |
| Apr 6, 2:28 AM MDT | Wind Advisory | GJT | 19 hr |
| Apr 6, 2:15 PM MDT | Freeze Warning | GJT | 20 hr |
| Apr 26, 6:13 PM MDT | Special Weather Statement | GJT | 32 min |
| May 3, 2:42 PM MDT | High Wind Watch | GJT | 25 hr |
| May 4, 3:23 PM MDT | High Wind Warning | GJT | 33 hr |
| May 6, 2:44 PM MDT | Freeze Watch | GJT | 24 hr |
| May 6, 2:44 PM MDT | Wind Advisory | GJT | 30 hr |
| May 7, 2:15 PM MDT | Freeze Warning | GJT | 18 hr |
| May 19, 6:09 PM MDT | Special Weather Statement | GJT | 36 min |
| May 25, 3:06 PM MDT | Special Weather Statement | GJT | 39 min |
| Jun 14, 2:25 PM MDT | Fire Weather Watch | GJT | 12 hr |
| Jun 14, 3:47 PM MDT | Special Weather Statement | GJT | 28 min |
| Jun 15, 2:33 AM MDT | Red Flag Warning | GJT | 43 hr |
| Jun 15, 2:33 AM MDT | Red Flag Warning | GJT | 67 hr |
| Jun 20, 2:13 AM MDT | Flood Watch | GJT | 44 hr |
| Jun 20, 12:09 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 3:56 PM MDT | Special Weather Statement | GJT | 34 min |
| Jun 20, 4:21 PM MDT | Special Weather Statement | GJT | 24 min |
| Jun 21, 9:43 AM MDT | Severe Thunderstorm Warning | GJT | 32 min |
| Jun 21, 11:10 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 12:02 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 21, 12:52 PM MDT | Special Weather Statement | GJT | 23 min |
| Jun 21, 2:11 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jun 21, 4:31 PM MDT | Special Weather Statement | GJT | 29 min |
| Jun 21, 4:31 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jun 21, 4:48 PM MDT | Special Weather Statement | GJT | 27 min |
| Jun 21, 5:22 PM MDT | Special Weather Statement | GJT | 23 min |
| Jun 21, 5:48 PM MDT | Severe Thunderstorm Warning | GJT | 27 min |
| Jun 21, 6:14 PM MDT | Severe Thunderstorm Warning | GJT | 16 min |
| Jun 21, 6:27 PM MDT | Severe Thunderstorm Warning | GJT | 33 min |
| Jun 21, 7:21 PM MDT | Areal Flood Advisory | GJT | 10 min |
| Jun 21, 7:31 PM MDT | Flash Flood Warning | GJT | 2 hr |
| Jun 22, 2:32 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 2:41 PM MDT | Severe Thunderstorm Warning | GJT | 34 min |
| Jun 22, 3:13 PM MDT | Severe Thunderstorm Warning | GJT | 8 min |
| Jun 24, 3:28 PM MDT | Special Weather Statement | GJT | 47 min |
| Jun 24, 4:13 PM MDT | Special Weather Statement | GJT | 47 min |
| Jun 26, 1:31 PM MDT | Flood Watch | GJT | 30 hr |
| Jun 27, 12:43 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 27, 1:17 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 27, 2:21 PM MDT | Severe Thunderstorm Warning | GJT | 39 min |
| Jun 27, 2:46 PM MDT | Severe Thunderstorm Warning | GJT | 29 min |
| Jun 27, 2:48 PM MDT | Flash Flood Warning | GJT | 118 min |
| Jun 27, 2:59 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Jun 27, 3:07 PM MDT | Severe Thunderstorm Warning | GJT | 23 min |
| Jun 27, 3:11 PM MDT | Severe Thunderstorm Warning | GJT | 34 min |
| Jun 27, 3:36 PM MDT | Severe Thunderstorm Warning | GJT | 24 min |
| Jun 27, 4:12 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jun 29, 2:23 AM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jun 29, 2:02 PM MDT | Flood Watch | GJT | 52 hr |
| Jul 2, 2:43 AM MDT | Fire Weather Watch | GJT | 23 hr |
| Jul 5, 12:24 AM MDT | Fire Weather Watch | GJT | 14 hr |
| Jul 5, 2:20 PM MDT | Red Flag Warning | GJT | 31 hr |
| Jul 6, 3:12 PM MDT | Fire Weather Watch | GJT | 11 hr |
| Jul 7, 2:30 AM MDT | Red Flag Warning | GJT | 19 hr |
| Jul 10, 2:47 AM MDT | Heat Advisory | GJT | 5 days |
| Jul 14, 4:30 AM MDT | Red Flag Warning | GJT | 17 hr |
| Jul 25, 5:46 PM MDT | Areal Flood Advisory | GJT | 59 min |
| Jul 25, 5:59 PM MDT | Special Weather Statement | GJT | 31 min |
| Jul 25, 6:42 PM MDT | Flash Flood Warning | GJT | 63 min |
| Jul 25, 8:34 PM MDT | Special Weather Statement | GJT | 26 min |
| Jul 27, 1:30 AM MDT | Fire Weather Watch | GJT | 12 hr |
| Jul 27, 1:06 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 1:08 PM MDT | Red Flag Warning | GJT | 31 hr |
| Jul 29, 2:42 PM MDT | Red Flag Warning | GJT | 29 hr |
| Aug 3, 5:52 PM MDT | Special Weather Statement | GJT | 38 min |
| Aug 3, 6:16 PM MDT | Areal Flood Advisory | GJT | 119 min |
| Aug 3, 6:20 PM MDT | Special Weather Statement | GJT | 25 min |
| Aug 3, 6:51 PM MDT | Flash Flood Warning | GJT | 114 min |
| Aug 8, 3:27 PM MDT | Special Weather Statement | GJT | 33 min |
| Aug 8, 3:54 PM MDT | Flash Flood Warning | GJT | 88 min |
| Aug 8, 4:13 PM MDT | Areal Flood Advisory | GJT | 74 min |
| Aug 8, 4:38 PM MDT | Special Weather Statement | GJT | 37 min |
| Aug 8, 4:48 PM MDT | Areal Flood Advisory | GJT | 76 min |
| Aug 8, 4:57 PM MDT | Areal Flood Advisory | GJT | 85 min |
| Aug 8, 5:15 PM MDT | Flash Flood Warning | GJT | 72 min |
| Aug 9, 5:25 PM MDT | Special Weather Statement | GJT | 35 min |
| Aug 9, 5:30 PM MDT | Areal Flood Advisory | GJT | 56 min |
| Aug 9, 6:18 PM MDT | Special Weather Statement | GJT | 27 min |
| Aug 9, 6:25 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 10, 5:18 PM MDT | Flood Watch | GJT | 3 hr |
| Aug 10, 6:23 PM MDT | Special Weather Statement | GJT | 37 min |
| Aug 10, 6:37 PM MDT | Severe Thunderstorm Warning | GJT | 23 min |
| Aug 11, 9:21 AM MDT | Flood Watch | GJT | 12 hr |
| Aug 11, 2:46 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Aug 11, 5:34 PM MDT | Flash Flood Warning | GJT | 116 min |
| Aug 11, 5:42 PM MDT | Special Weather Statement | GJT | 33 min |
| Aug 11, 6:06 PM MDT | Special Weather Statement | GJT | 24 min |
| Aug 12, 10:37 PM MDT | Special Weather Statement | GJT | 23 min |
| Aug 13, 6:17 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 13, 7:44 PM MDT | Flash Flood Warning | GJT | 2 hr |
| Aug 20, 9:05 PM MDT | Special Weather Statement | GJT | 40 min |
| Aug 20, 10:16 PM MDT | Special Weather Statement | GJT | 29 min |
| Aug 20, 10:48 PM MDT | Special Weather Statement | GJT | 27 min |
| Aug 21, 1:56 PM MDT | Flood Watch | GJT | 34 hr |
| Aug 21, 8:30 PM MDT | Special Weather Statement | GJT | 30 min |
| Aug 23, 2:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 23, 4:06 PM MDT | Special Weather Statement | GJT | 24 min |
| Aug 23, 4:18 PM MDT | Severe Thunderstorm Warning | GJT | 27 min |
| Aug 23, 4:31 PM MDT | Severe Thunderstorm Warning | GJT | 29 min |
| Aug 23, 4:45 PM MDT | Areal Flood Advisory | GJT | 60 min |
| Aug 23, 4:56 PM MDT | Severe Thunderstorm Warning | GJT | 34 min |
| Aug 23, 5:33 PM MDT | Severe Thunderstorm Warning | GJT | 27 min |
| Aug 23, 5:53 PM MDT | Special Weather Statement | GJT | 37 min |
| Aug 23, 5:55 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 23, 5:59 PM MDT | Severe Thunderstorm Warning | GJT | 31 min |
| Aug 23, 6:09 PM MDT | Flash Flood Warning | GJT | 7 hr |
| Aug 23, 6:18 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 23, 6:30 PM MDT | Special Weather Statement | GJT | 30 min |
| Aug 23, 6:33 PM MDT | Flash Flood Warning | GJT | 7 hr |
| Aug 23, 6:58 PM MDT | Special Weather Statement | GJT | 32 min |
| Aug 23, 9:52 PM MDT | Severe Thunderstorm Warning | GJT | 23 min |
| Aug 23, 10:17 PM MDT | Special Weather Statement | GJT | 28 min |
| Aug 23, 10:49 PM MDT | Special Weather Statement | GJT | 26 min |
| Aug 23, 11:17 PM MDT | Special Weather Statement | GJT | 28 min |
| Aug 23, 11:47 PM MDT | Special Weather Statement | GJT | 28 min |
| Aug 24, 12:16 AM MDT | Special Weather Statement | GJT | 29 min |
| Aug 24, 1:07 AM MDT | Special Weather Statement | GJT | 23 min |
| Aug 24, 1:36 AM MDT | Special Weather Statement | GJT | 24 min |
| Aug 25, 6:29 AM MDT | Flood Watch | GJT | 18 hr |
| Aug 25, 8:29 AM MDT | Special Weather Statement | GJT | 31 min |
| Aug 25, 10:27 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 25, 1:22 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 25, 1:24 PM MDT | Special Weather Statement | GJT | 36 min |
| Aug 25, 1:55 PM MDT | Severe Thunderstorm Warning | GJT | 35 min |
| Aug 25, 1:58 PM MDT | Special Weather Statement | GJT | 32 min |
| Aug 25, 2:10 PM MDT | Special Weather Statement | GJT | 35 min |
| Aug 25, 2:35 PM MDT | Special Weather Statement | GJT | 25 min |
| Aug 25, 3:56 PM MDT | Special Weather Statement | GJT | 34 min |
| Aug 25, 3:57 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Aug 25, 4:20 PM MDT | Severe Thunderstorm Warning | GJT | 25 min |
| Aug 25, 4:29 PM MDT | Special Weather Statement | GJT | 46 min |
| Aug 25, 5:26 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 25, 5:29 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 25, 5:43 PM MDT | Special Weather Statement | GJT | 32 min |
| Sep 10, 1:48 PM MDT | Fire Weather Watch | GJT | 13 hr |
| Sep 11, 2:23 AM MDT | Red Flag Warning | GJT | 42 hr |
| Sep 16, 12:34 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Oct 17, 2:14 PM MDT | Winter Weather Advisory | GJT | 42 hr |
| Oct 18, 5:35 AM MDT | Special Weather Statement | GJT | 25 min |
| Oct 20, 2:30 PM MDT | Special Weather Statement | GJT | 30 min |
| Oct 27, 3:03 PM MDT | Winter Weather Advisory | GJT | 3 days |
| Oct 29, 1:01 PM MDT | Freeze Warning | GJT | 45 hr |
| Oct 31, 2:09 PM MDT | Freeze Warning | GJT | 20 hr |
| Nov 2, 3:00 PM MDT | Winter Weather Advisory | GJT | 45 hr |
| Nov 15, 12:38 AM MST | Wind Advisory | GJT | 16 hr |
| Nov 25, 1:52 AM MST | Winter Storm Warning | GJT | 60 hr |
| Dec 29, 2:38 AM MST | Dense Fog Advisory | GJT | 10 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 | 20 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 49 |
| Flooding | |
| Flash Flood Warning | 17 |
| Flood Watch | 7 |
| Areal Flood Advisory | 9 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 14 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 2 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 2 |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 8 |
| Fire Weather Watch | 6 |
| 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 archive20232025
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.