Alert archive / Utah / Grand County
Weather alerts in Grand County, Utah, 2019
121 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 121
- Warnings
- 39
- Watches
- 28
- Advisories
- 33
- Busiest month
- July16 alerts
- Busiest day
- April 9, 20194 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, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 0 | 100% | 4 | 0% | |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: severe thunderstorm warnings | 15 | 2 | 87% | 42 | 7% | 12 min |
| NWS Grand Junction, CO: flash flood warnings | 7 | 2 | 71% | 7 | 29% | 40 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, 3:41 AM MST | Winter Weather Advisory | GJT | 68 hr |
| Jan 8, 7:45 AM MST | Dense Fog Advisory | GJT | 4 hr |
| Jan 10, 2:10 AM MST | Dense Fog Advisory | GJT | 8 hr |
| Jan 11, 4:29 AM MST | Dense Fog Advisory | GJT | 71 min |
| Jan 14, 2:15 PM MST | Winter Weather Advisory | GJT | 55 hr |
| Jan 16, 2:38 PM MST | Winter Weather Advisory | GJT | 57 hr |
| Jan 16, 8:28 PM MST | Dense Fog Advisory | GJT | 14 hr |
| Jan 17, 10:05 AM MST | Dense Fog Advisory | GJT | 3 hr |
| Jan 20, 3:08 AM MST | Winter Weather Advisory | GJT | 53 hr |
| Feb 2, 3:48 AM MST | Winter Storm Warning | GJT | 38 hr |
| Feb 2, 3:48 AM MST | Winter Weather Advisory | GJT | 38 hr |
| Feb 4, 3:35 PM MST | Winter Storm Warning | GJT | 61 hr |
| Feb 12, 3:34 PM MST | Winter Storm Watch | GJT | 12 hr |
| Feb 13, 3:14 AM MST | Winter Weather Advisory | GJT | 54 hr |
| Feb 14, 11:52 PM MST | Dense Fog Advisory | GJT | 11 hr |
| Feb 15, 1:53 PM MST | Winter Weather Advisory | GJT | 22 hr |
| Feb 17, 4:43 AM MST | Winter Storm Warning | GJT | 61 hr |
| Feb 19, 6:19 PM MST | Winter Storm Warning | GJT | 3 days |
| Feb 20, 3:42 AM MST | Winter Storm Watch | GJT | 11 hr |
| Feb 20, 2:33 PM MST | Winter Weather Advisory | GJT | 60 hr |
| Feb 28, 4:50 AM MST | Winter Storm Warning | GJT | 4 days |
| Feb 28, 3:21 PM MST | Winter Storm Watch | GJT | 13 hr |
| Mar 5, 3:38 PM MST | Winter Weather Advisory | GJT | 50 hr |
| Mar 10, 3:15 PM MDT | Winter Storm Warning | GJT | 4 days |
| Mar 11, 3:12 PM MDT | Winter Weather Advisory | GJT | 63 hr |
| Mar 19, 3:30 PM MDT | Winter Storm Watch | GJT | 12 hr |
| Mar 20, 3:19 AM MDT | Winter Storm Warning | GJT | 69 hr |
| Apr 8, 2:10 PM MDT | Wind Advisory | GJT | 32 hr |
| Apr 8, 11:47 PM MDT | Winter Storm Watch | GJT | 4 hr |
| Apr 9, 3:52 AM MDT | Winter Weather Advisory | GJT | 53 hr |
| Apr 9, 3:57 AM MDT | Freeze Watch | GJT | 35 hr |
| Apr 9, 12:11 PM MDT | Wind Advisory | GJT | 33 hr |
| Apr 10, 3:29 AM MDT | Freeze Warning | GJT | 31 hr |
| Apr 10, 3:01 PM MDT | Freeze Watch | GJT | 12 hr |
| Apr 11, 3:26 AM MDT | Freeze Warning | GJT | 31 hr |
| Apr 12, 2:57 AM MDT | Freeze Warning | GJT | 30 hr |
| Apr 26, 2:17 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Apr 26, 5:32 PM MDT | Special Weather Statement | GJT | 43 min |
| Apr 26, 6:01 PM MDT | Special Weather Statement | GJT | 44 min |
| Apr 27, 8:40 PM MDT | Special Weather Statement | GJT | 50 min |
| Apr 28, 1:11 PM MDT | Special Weather Statement | GJT | 49 min |
| Apr 28, 2:04 PM MDT | Wind Advisory | GJT | 6 hr |
| May 15, 7:08 PM MDT | Wind Advisory | GJT | 27 hr |
| May 22, 3:29 AM MDT | Winter Storm Watch | GJT | 11 hr |
| May 22, 2:55 PM MDT | Winter Weather Advisory | GJT | 32 hr |
| May 23, 1:49 PM MDT | Special Weather Statement | GJT | 41 min |
| May 23, 3:22 PM MDT | Special Weather Statement | GJT | 53 min |
| May 23, 3:43 PM MDT | Special Weather Statement | GJT | 47 min |
| May 27, 2:51 PM MDT | Special Weather Statement | GJT | 39 min |
| Jun 8, 4:21 PM MDT | River Flood Advisory | GJT | 10 days |
| Jun 14, 1:20 PM MDT | Special Weather Statement | GJT | 40 min |
| Jun 14, 10:09 PM MDT | River Flood Advisory | GJT | 4 days |
| Jun 18, 2:37 PM MDT | Fire Weather Watch | GJT | 24 hr |
| Jun 19, 2:51 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 21, 4:32 PM MDT | Special Weather Statement | GJT | 43 min |
| Jun 21, 5:18 PM MDT | Special Weather Statement | GJT | 42 min |
| Jun 25, 3:14 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 26, 3:10 PM MDT | Red Flag Warning | GJT | 29 hr |
| Jun 27, 2:40 PM MDT | Red Flag Warning | GJT | 29 hr |
| Jul 1, 2:01 PM MDT | Fire Weather Watch | GJT | 25 hr |
| Jul 1, 2:01 PM MDT | Fire Weather Watch | GJT | 36 hr |
| Jul 2, 2:53 PM MDT | Red Flag Warning | GJT | 29 hr |
| Jul 3, 2:22 AM MDT | Red Flag Warning | GJT | 42 hr |
| Jul 7, 1:32 PM MDT | Red Flag Warning | GJT | 31 hr |
| Jul 13, 5:59 PM MDT | Special Weather Statement | GJT | 31 min |
| Jul 14, 2:21 PM MDT | Fire Weather Watch | GJT | 24 hr |
| Jul 15, 2:24 PM MDT | Fire Weather Watch | GJT | 25 hr |
| Jul 15, 2:24 PM MDT | Red Flag Warning | GJT | 54 hr |
| Jul 15, 2:24 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jul 25, 3:26 PM MDT | Special Weather Statement | GJT | 34 min |
| Jul 25, 3:58 PM MDT | Special Weather Statement | GJT | 32 min |
| Jul 25, 4:27 PM MDT | Special Weather Statement | GJT | 33 min |
| Jul 26, 5:13 PM MDT | Special Weather Statement | GJT | 32 min |
| Jul 27, 3:57 AM MDT | Flash Flood Watch | GJT | 17 hr |
| Jul 27, 6:57 PM MDT | Special Weather Statement | GJT | 33 min |
| Aug 6, 6:04 PM MDT | Special Weather Statement | GJT | 41 min |
| Aug 14, 1:56 PM MDT | Fire Weather Watch | GJT | 21 hr |
| Aug 15, 11:15 AM MDT | Fire Weather Watch | GJT | 27 hr |
| Aug 15, 11:15 AM MDT | Red Flag Warning | GJT | 33 hr |
| Aug 16, 2:01 PM MDT | Red Flag Warning | GJT | 30 hr |
| Aug 23, 2:44 PM MDT | Fire Weather Watch | GJT | 13 hr |
| Aug 24, 3:52 AM MDT | Red Flag Warning | GJT | 40 hr |
| Aug 27, 2:53 PM MDT | Fire Weather Watch | GJT | 31 hr |
| Aug 28, 2:48 PM MDT | Red Flag Warning | GJT | 29 hr |
| Sep 6, 2:38 PM MDT | Fire Weather Watch | GJT | 24 hr |
| Sep 7, 2:12 PM MDT | Red Flag Warning | GJT | 31 hr |
| Sep 10, 11:57 AM MDT | Special Weather Statement | GJT | 48 min |
| Sep 10, 12:20 PM MDT | Severe Thunderstorm Warning | GJT | 15 min |
| Sep 10, 12:31 PM MDT | Severe Thunderstorm Warning | GJT | 29 min |
| Sep 10, 12:50 PM MDT | Severe Thunderstorm Warning | GJT | 40 min |
| Sep 11, 9:30 AM MDT | Special Weather Statement | GJT | 60 min |
| Sep 19, 3:03 AM MDT | Red Flag Warning | GJT | 18 hr |
| Sep 19, 2:58 PM MDT | Red Flag Warning | GJT | 29 hr |
| Sep 27, 3:15 PM MDT | Wind Advisory | GJT | 30 hr |
| Sep 28, 4:22 AM MDT | Wind Advisory | GJT | 41 hr |
| Sep 28, 3:03 PM MDT | Fire Weather Watch | GJT | 24 hr |
| Sep 29, 2:54 PM MDT | Red Flag Warning | GJT | 30 hr |
| Sep 30, 3:15 AM MDT | Fire Weather Watch | GJT | 11 hr |
| Sep 30, 2:24 PM MDT | Red Flag Warning | GJT | 29 hr |
| Oct 2, 2:01 PM MDT | Fire Weather Watch | GJT | 25 hr |
| Oct 3, 2:32 PM MDT | Red Flag Warning | GJT | 29 hr |
| Oct 7, 12:11 PM MDT | Fire Weather Watch | GJT | 15 hr |
| Oct 8, 2:55 AM MDT | Red Flag Warning | GJT | 42 hr |
| Oct 8, 3:52 AM MDT | Wind Advisory | GJT | 41 hr |
| Oct 9, 3:50 AM MDT | Freeze Watch | GJT | 24 hr |
| Oct 10, 3:37 AM MDT | Freeze Warning | GJT | 30 hr |
| Oct 10, 3:42 AM MDT | Red Flag Warning | GJT | 16 hr |
| Oct 15, 2:15 PM MDT | Fire Weather Watch | GJT | 25 hr |
| Oct 16, 2:57 PM MDT | Red Flag Warning | GJT | 28 hr |
| Oct 18, 2:37 PM MDT | Fire Weather Watch | GJT | 13 hr |
| Oct 19, 3:55 AM MDT | Red Flag Warning | GJT | 16 hr |
| Nov 18, 2:43 PM MST | Winter Storm Watch | GJT | 12 hr |
| Nov 18, 2:43 PM MST | Winter Storm Warning | GJT | 4 days |
| Nov 24, 2:28 PM MST | Winter Weather Advisory | GJT | 51 hr |
| Nov 26, 4:02 PM MST | Winter Storm Warning | GJT | 4 days |
| Dec 4, 3:29 AM MST | Winter Weather Advisory | GJT | 37 hr |
| Dec 7, 2:39 AM MST | Winter Weather Advisory | GJT | 56 hr |
| Dec 11, 3:02 PM MST | Winter Weather Advisory | GJT | 4 days |
| Dec 11, 9:28 PM MST | Winter Storm Watch | GJT | 41 hr |
| Dec 23, 2:58 AM MST | Winter Weather Advisory | GJT | 68 hr |
| Dec 26, 2:40 AM MST | Winter Weather Advisory | GJT | 50 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 | 3 |
| Mesoscale Discussion | 1 |
| Special Weather Statement | 20 |
| Flooding | |
| Flash Flood Watch | 1 |
| River Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 9 |
| Winter Storm Watch | 8 |
| Winter Weather Advisory | 18 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 3 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 23 |
| Fire Weather Watch | 16 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.