Alert archive / Utah / Davis County
Weather alerts in Davis County, Utah, 2012
45 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Davis County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 45
- Warnings
- 19
- Watches
- 13
- Advisories
- 2
- Busiest month
- September14 alerts
- Busiest day
- September 1, 20129 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Davis County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 3 | 50% | 1 | 100% | 11 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Salt Lake City, UT: tornado warnings | 0 | 1 | 0% | |||
| NWS Salt Lake City, UT: severe thunderstorm warnings | 30 | 9 | 70% | 52 | 38% | 28 min |
| NWS Salt Lake City, UT: flash flood warnings | 67 | 29 | 57% | 55 | 65% | 79 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 21, 3:24 PM MST | Areal Flood Advisory | SLC | 4 hr |
| Apr 26, 8:08 PM MDT | Severe Thunderstorm Warning | SLC | 22 min |
| May 18, 8:23 AM MDT | Special Weather Statement | SLC | 52 min |
| May 19, 2:15 PM MDT | Fire Weather Watch | SLC | 24 hr |
| May 20, 1:45 PM MDT | Red Flag Warning | SLC | 62 hr |
| Jun 1, 2:25 PM MDT | Fire Weather Watch | SLC | 43 hr |
| Jun 2, 8:59 AM MDT | Red Flag Warning | SLC | 12 hr |
| Jun 3, 2:58 AM MDT | Red Flag Warning | SLC | 68 hr |
| Jun 6, 3:24 AM MDT | Fire Weather Watch | SLC | 11 hr |
| Jun 6, 2:23 PM MDT | Red Flag Warning | SLC | 4 days |
| Jun 15, 2:47 PM MDT | Fire Weather Watch | SLC | 12 hr |
| Jun 16, 3:03 AM MDT | Red Flag Warning | SLC | 67 hr |
| Jun 19, 2:00 PM MDT | Fire Weather Watch | SLC | 4 days |
| Jun 20, 2:00 PM MDT | Red Flag Warning | SLC | 9 days |
| Jun 21, 2:18 PM MDT | Fire Weather Watch | SLC | 37 hr |
| Jun 23, 3:25 AM MDT | Fire Weather Watch | SLC | 29 hr |
| Jul 2, 3:32 PM MDT | Red Flag Warning | SLC | 53 hr |
| Jul 13, 6:04 PM MDT | Severe Thunderstorm Warning | SLC | 41 min |
| Jul 13, 6:33 PM MDT | Special Weather Statement | SLC | 42 min |
| Jul 16, 5:19 PM MDT | Severe Thunderstorm Warning | SLC | 41 min |
| Jul 16, 5:54 PM MDT | Special Weather Statement | SLC | 51 min |
| Jul 16, 6:13 PM MDT | Areal Flood Advisory | SLC | 3 hr |
| Aug 8, 11:57 AM MDT | Red Flag Warning | SLC | 12 hr |
| Aug 10, 5:51 PM MDT | Special Weather Statement | SLC | 69 min |
| Aug 17, 1:54 PM MDT | Fire Weather Watch | SLC | 24 hr |
| Aug 18, 2:10 PM MDT | Red Flag Warning | SLC | 34 hr |
| Aug 20, 3:06 PM MDT | Red Flag Warning | SLC | 33 hr |
| Aug 27, 2:47 AM MDT | Fire Weather Watch | SLC | 25 hr |
| Aug 30, 5:20 PM MDT | Special Weather Statement | SLC | 55 min |
| Aug 31, 9:40 PM MDT | Severe Thunderstorm Warning | SLC | 35 min |
| Aug 31, 10:20 PM MDT | Special Weather Statement | SLC | 70 min |
| Sep 1, 12:31 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Sep 1, 12:59 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 1, 3:02 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Sep 1, 5:26 PM MDT | Special Weather Statement | SLC | 49 min |
| Sep 1, 5:40 PM MDT | Severe Thunderstorm Warning | SLC | 30 min |
| Sep 1, 5:49 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Sep 1, 5:52 PM MDT | Severe Thunderstorm Warning | SLC | 38 min |
| Sep 1, 8:02 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Sep 5, 3:21 PM MDT | Fire Weather Watch | SLC | 12 hr |
| Sep 5, 3:21 PM MDT | Red Flag Warning | SLC | 29 hr |
| Sep 21, 1:57 PM MDT | Fire Weather Watch | SLC | 25 hr |
| Sep 22, 2:56 PM MDT | Red Flag Warning | SLC | 29 hr |
| Oct 1, 2:09 PM MDT | Fire Weather Watch | SLC | 13 hr |
| Oct 2, 3:02 AM MDT | Red Flag Warning | SLC | 41 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 | 6 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 4 |
| Special Weather Statement | 7 |
| Flooding | |
| Areal Flood Advisory | 2 |
| Fire | |
| Red Flag Warning | 13 |
| Fire Weather Watch | 12 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20112013
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.