Alert archive / Wyoming / Niobrara County
Weather alerts in Niobrara County, Wyoming, 2012
68 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Niobrara County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 68
- Warnings
- 18
- Watches
- 11
- Advisories
- 9
- Busiest month
- June23 alerts
- Busiest day
- June 24, 20125 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Niobrara County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 10 | 5 | 50% | 2 | 100% | 25 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Cheyenne, WY: tornado warnings | 9 | 4 | 56% | 9 | 78% | 19 min |
| NWS Cheyenne, WY: severe thunderstorm warnings | 83 | 34 | 59% | 108 | 74% | 22 min |
| NWS Cheyenne, WY: flash flood warnings | 12 | 6 | 50% | 11 | 73% | 64 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 16, 1:34 PM MST | High Wind Watch | CYS | 25 hr |
| Jan 16, 1:34 PM MST | High Wind Warning | CYS | 4 days |
| Feb 18, 3:28 PM MST | Winter Weather Advisory | CYS | 43 hr |
| Feb 20, 4:03 AM MST | High Wind Warning | CYS | 70 hr |
| Feb 20, 2:31 PM MST | High Wind Watch | CYS | 24 hr |
| Feb 27, 5:16 AM MST | Winter Weather Advisory | CYS | 42 hr |
| Mar 25, 3:44 AM MDT | High Wind Watch | CYS | 11 hr |
| Mar 25, 2:30 PM MDT | High Wind Warning | CYS | 37 hr |
| Apr 6, 3:18 AM MDT | High Wind Warning | CYS | 18 hr |
| Apr 6, 12:11 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Apr 6, 1:56 PM MDT | Special Weather Statement | CYS | 64 min |
| Apr 13, 9:31 PM MDT | Winter Weather Advisory | CYS | 38 hr |
| Apr 26, 8:20 PM MDT | Severe Thunderstorm Warning | CYS | 25 min |
| May 3, 3:44 PM MDT | Special Weather Statement | CYS | 31 min |
| May 5, 3:23 PM MDT | Special Weather Statement | CYS | 37 min |
| May 18, 2:54 PM MDT | Mesoscale Discussion | SPC | 96 min |
| May 18, 3:21 PM MDT | Special Weather Statement | CYS | 54 min |
| May 26, 2:55 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 7:30 PM MDT | Special Weather Statement | CYS | 30 min |
| Jun 5, 5:13 PM MDT | Special Weather Statement | CYS | 62 min |
| Jun 7, 10:59 AM MDT | Mesoscale Discussion | SPC | 91 min |
| Jun 7, 11:46 AM MDT | Tornado Watch | SPC | 10 hr |
| Jun 7, 12:43 PM MDT | Special Weather Statement | CYS | 47 min |
| Jun 7, 5:52 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jun 15, 1:35 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 22, 3:52 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 22, 5:39 PM MDT | Special Weather Statement | CYS | 51 min |
| Jun 22, 6:25 PM MDT | Special Weather Statement | CYS | 50 min |
| Jun 22, 6:33 PM MDT | Severe Thunderstorm Warning | CYS | 42 min |
| Jun 22, 6:52 PM MDT | Flash Flood Warning | CYS | 2 hr |
| Jun 24, 4:21 PM MDT | Special Weather Statement | CYS | 39 min |
| Jun 24, 5:05 PM MDT | Special Weather Statement | CYS | 40 min |
| Jun 24, 5:19 PM MDT | Severe Thunderstorm Warning | CYS | 41 min |
| Jun 24, 5:36 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 24, 5:55 PM MDT | Severe Thunderstorm Warning | CYS | 50 min |
| Jun 24, 6:57 PM MDT | Special Weather Statement | CYS | 18 min |
| Jun 25, 3:07 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 3:11 PM MDT | Severe Thunderstorm Warning | CYS | 64 min |
| Jun 25, 3:36 PM MDT | Severe Thunderstorm Warning | CYS | 54 min |
| Jun 26, 6:46 PM MDT | Special Weather Statement | CYS | 29 min |
| Jun 26, 7:18 PM MDT | Special Weather Statement | CYS | 27 min |
| Jul 1, 4:33 PM MDT | Special Weather Statement | CYS | 27 min |
| Jul 1, 5:00 PM MDT | Special Weather Statement | CYS | 30 min |
| Jul 5, 2:40 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jul 5, 4:10 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 5, 5:44 PM MDT | Severe Thunderstorm Warning | CYS | 46 min |
| Jul 5, 6:10 PM MDT | Severe Thunderstorm Warning | CYS | 50 min |
| Jul 5, 7:16 PM MDT | Special Weather Statement | CYS | 29 min |
| Jul 5, 8:44 PM MDT | Severe Thunderstorm Warning | CYS | 46 min |
| Jul 5, 8:52 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jul 21, 1:54 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jul 21, 3:09 PM MDT | Special Weather Statement | CYS | 66 min |
| Jul 21, 8:47 PM MDT | Special Weather Statement | CYS | 58 min |
| Jul 22, 3:44 PM MDT | Special Weather Statement | CYS | 61 min |
| Jul 22, 4:32 PM MDT | Special Weather Statement | CYS | 43 min |
| Aug 10, 5:39 PM MDT | Severe Thunderstorm Warning | CYS | 46 min |
| Oct 3, 2:49 AM MDT | Freeze Watch | CYS | 12 hr |
| Oct 3, 2:20 PM MDT | Freeze Warning | CYS | 19 hr |
| Oct 4, 1:47 PM MDT | Winter Weather Advisory | CYS | 23 hr |
| Oct 5, 9:21 AM MDT | Winter Weather Advisory | CYS | 26 hr |
| Oct 15, 3:34 PM MDT | High Wind Watch | CYS | 37 hr |
| Oct 17, 4:16 AM MDT | High Wind Warning | CYS | 38 hr |
| Oct 23, 1:47 PM MDT | Winter Weather Advisory | CYS | 36 hr |
| Nov 9, 2:54 AM MST | Winter Weather Advisory | CYS | 41 hr |
| Nov 20, 11:55 AM MST | High Wind Watch | CYS | 15 hr |
| Nov 21, 2:52 AM MST | High Wind Warning | CYS | 36 hr |
| Dec 9, 5:20 PM MST | Wind Chill Advisory | CYS | 12 hr |
| Dec 23, 12:53 PM MST | Winter Weather Advisory | CYS | 44 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 | 10 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 9 |
| Special Weather Statement | 21 |
| Flooding | |
| Flash Flood Warning | 1 |
| Winter | |
| Winter Weather Advisory | 8 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 6 |
| High Wind Watch | 5 |
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.