Alert archive / Utah / Summit County
Weather alerts in Summit County, Utah, 2022
81 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Summit County and its neighbors
Each county as a circle sized by its count in 2022. Tap one for its archive.
- Alerts
- 81
- Warnings
- 22
- Watches
- 13
- Advisories
- 27
- Busiest month
- July13 alerts
- Busiest day
- June 29, 20226 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Summit County, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 4 | 20% | 2 | 0% | |
| Flash flood warnings | 0 | 1 | 0% |
Each office's whole area, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Salt Lake City, UT: tornado warnings | 0 | 4 | 0% | |||
| NWS Salt Lake City, UT: severe thunderstorm warnings | 108 | 28 | 74% | 176 | 27% | 22 min |
| NWS Salt Lake City, UT: flash flood warnings | 126 | 44 | 65% | 79 | 68% | 71 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 3, 3:04 PM MST | Winter Weather Advisory | SLC | 62 hr |
| Jan 4, 3:05 PM MST | Winter Storm Warning | SLC | 43 hr |
| Feb 20, 3:12 PM MST | Winter Weather Advisory | SLC | 31 hr |
| Feb 21, 3:55 PM MST | Winter Weather Advisory | SLC | 52 hr |
| Mar 4, 2:51 PM MST | Winter Weather Advisory | SLC | 49 hr |
| Mar 7, 2:48 AM MST | Winter Storm Watch | SLC | 13 hr |
| Mar 7, 3:19 PM MST | Winter Storm Warning | SLC | 50 hr |
| Mar 7, 3:19 PM MST | Winter Weather Advisory | SLC | 56 hr |
| Mar 19, 2:58 PM MDT | Winter Weather Advisory | SLC | 27 hr |
| Mar 28, 3:18 AM MDT | Winter Weather Advisory | SLC | 48 hr |
| Apr 3, 12:37 PM MDT | Wind Advisory | SLC | 53 hr |
| Apr 4, 3:12 AM MDT | Winter Weather Advisory | SLC | 34 hr |
| Apr 10, 4:22 AM MDT | Winter Storm Watch | SLC | 11 hr |
| Apr 10, 3:15 PM MDT | Winter Storm Warning | SLC | 60 hr |
| Apr 21, 3:25 AM MDT | Winter Weather Advisory | SLC | 57 hr |
| Apr 21, 11:56 PM MDT | Wind Advisory | SLC | 45 min |
| Apr 22, 12:41 AM MDT | High Wind Warning | SLC | 3 hr |
| May 2, 9:11 PM MDT | Severe Thunderstorm Warning | SLC | 41 min |
| May 18, 10:52 AM MDT | Hard Freeze Watch | SLC | 15 hr |
| May 18, 10:52 AM MDT | Hard Freeze Watch | SLC | 28 hr |
| May 19, 2:00 AM MDT | Hard Freeze Warning | SLC | 31 hr |
| May 19, 2:33 PM MDT | Hard Freeze Warning | SLC | 42 hr |
| May 27, 4:42 PM MDT | Special Weather Statement | SLC | 48 min |
| May 28, 8:57 PM MDT | Winter Weather Advisory | SLC | 42 hr |
| Jun 16, 12:41 PM MDT | Wind Advisory | SLC | 57 hr |
| Jun 28, 6:32 PM MDT | Special Weather Statement | SLC | 28 min |
| Jun 28, 6:58 PM MDT | Special Weather Statement | SLC | 32 min |
| Jun 29, 12:10 PM MDT | Special Weather Statement | SLC | 35 min |
| Jun 29, 3:00 PM MDT | Special Weather Statement | SLC | 45 min |
| Jun 29, 3:06 PM MDT | Special Weather Statement | SLC | 39 min |
| Jun 29, 3:32 PM MDT | Special Weather Statement | SLC | 43 min |
| Jun 30, 5:19 PM MDT | Special Weather Statement | SLC | 26 min |
| Jun 30, 8:38 PM MDT | Special Weather Statement | SLC | 52 min |
| Jul 1, 1:59 AM MDT | Red Flag Warning | SLC | 4 days |
| Jul 7, 12:47 PM MDT | Red Flag Warning | SLC | 56 hr |
| Jul 17, 6:11 PM MDT | Severe Thunderstorm Warning | SLC | 34 min |
| Jul 17, 6:45 PM MDT | Severe Thunderstorm Warning | SLC | 45 min |
| Jul 17, 7:22 PM MDT | Special Weather Statement | SLC | 53 min |
| Jul 17, 8:17 PM MDT | Special Weather Statement | SLC | 28 min |
| Jul 18, 2:01 PM MDT | Special Weather Statement | SLC | 29 min |
| Jul 18, 2:29 PM MDT | Special Weather Statement | SLC | 31 min |
| Jul 22, 1:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 22, 3:58 PM MDT | Special Weather Statement | SLC | 32 min |
| Jul 22, 5:26 PM MDT | Severe Thunderstorm Warning | SLC | 49 min |
| Jul 22, 6:14 PM MDT | Special Weather Statement | SLC | 46 min |
| Aug 1, 11:06 AM MDT | Flood Watch | SLC | 13 hr |
| Aug 11, 1:44 PM MDT | Flood Watch | SLC | 3 days |
| Aug 11, 2:57 PM MDT | Severe Thunderstorm Warning | SLC | 37 min |
| Aug 11, 3:03 PM MDT | Special Weather Statement | SLC | 42 min |
| Aug 11, 3:16 PM MDT | Areal Flood Advisory | SLC | 119 min |
| Aug 12, 3:22 PM MDT | Special Weather Statement | SLC | 38 min |
| Aug 21, 7:22 PM MDT | Areal Flood Advisory | SLC | 3 hr |
| Sep 12, 2:28 PM MDT | Flood Watch | SLC | 55 hr |
| Sep 21, 12:19 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 21, 1:56 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Oct 20, 12:07 PM MDT | Winter Storm Watch | SLC | 15 hr |
| Oct 21, 3:07 AM MDT | Winter Storm Warning | SLC | 69 hr |
| Oct 21, 3:07 AM MDT | Winter Weather Advisory | SLC | 48 hr |
| Oct 26, 2:12 AM MDT | Winter Weather Advisory | SLC | 28 hr |
| Oct 31, 2:12 PM MDT | Winter Weather Advisory | SLC | 3 days |
| Nov 4, 3:21 AM MDT | Winter Weather Advisory | SLC | 55 hr |
| Nov 4, 2:38 PM MDT | Winter Storm Warning | SLC | 43 hr |
| Nov 6, 1:52 PM MST | Winter Storm Watch | SLC | 25 hr |
| Nov 7, 2:26 PM MST | Winter Storm Warning | SLC | 66 hr |
| Nov 8, 7:09 AM MST | Winter Weather Advisory | SLC | 45 hr |
| Nov 27, 3:18 AM MST | Winter Weather Advisory | SLC | 59 hr |
| Nov 28, 1:04 PM MST | Winter Storm Warning | SLC | 25 hr |
| Nov 30, 2:33 PM MST | Winter Storm Watch | SLC | 24 hr |
| Dec 1, 2:13 PM MST | Winter Storm Warning | SLC | 24 hr |
| Dec 4, 2:53 AM MST | Winter Weather Advisory | SLC | 48 hr |
| Dec 8, 2:48 PM MST | Winter Weather Advisory | SLC | 25 hr |
| Dec 10, 2:49 PM MST | Winter Storm Watch | SLC | 13 hr |
| Dec 10, 2:49 PM MST | Winter Storm Warning | SLC | 3 days |
| Dec 10, 2:49 PM MST | Winter Weather Advisory | SLC | 4 days |
| Dec 20, 3:25 AM MST | Winter Weather Advisory | SLC | 10 hr |
| Dec 20, 1:33 PM MST | Wind Chill Warning | SLC | 45 hr |
| Dec 20, 1:33 PM MST | Winter Storm Warning | SLC | 39 hr |
| Dec 20, 1:33 PM MST | Winter Weather Advisory | SLC | 35 hr |
| Dec 26, 2:35 PM MST | Winter Weather Advisory | SLC | 54 hr |
| Dec 28, 2:55 PM MST | Winter Storm Watch | SLC | 25 hr |
| Dec 29, 3:30 PM MST | Winter Storm Warning | SLC | 4 days |
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 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 17 |
| Flooding | |
| Flood Watch | 3 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 11 |
| Winter Storm Watch | 7 |
| Winter Weather Advisory | 22 |
| Cold | |
| Hard Freeze Warning | 2 |
| Wind Chill Warning | 1 |
| Hard Freeze Watch | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20212023
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.