Alert archive / Wyoming / Niobrara County
Weather alerts in Niobrara County, Wyoming, 2016
125 weather alerts in 2016, 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 2016. Tap one for its archive.
- Alerts
- 125
- Warnings
- 35
- Watches
- 10
- Advisories
- 8
- Busiest month
- July38 alerts
- Busiest day
- June 28, 201610 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 2 tornado warnings covering Niobrara County in 2016 had a tornado report inside them.
Niobrara County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 22 | 9 | 59% | 10 | 70% | 19 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Cheyenne, WY: tornado warnings | 16 | 3 | 81% | 9 | 33% | 6 min |
| NWS Cheyenne, WY: severe thunderstorm warnings | 187 | 90 | 52% | 218 | 76% | 18 min |
| NWS Cheyenne, WY: flash flood warnings | 16 | 13 | 19% | 31 | 94% | 44 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 31, 11:34 AM MST | Winter Weather Advisory | CYS | 48 hr |
| Feb 17, 1:16 PM MST | High Wind Watch | CYS | 13 hr |
| Feb 17, 1:16 PM MST | High Wind Warning | CYS | 52 hr |
| Mar 21, 2:03 AM MDT | Winter Storm Watch | CYS | 34 hr |
| Mar 22, 1:21 AM MDT | Winter Storm Warning | CYS | 41 hr |
| Mar 28, 5:29 AM MDT | Winter Storm Watch | CYS | 33 hr |
| Mar 28, 2:01 PM MDT | Blizzard Watch | CYS | 25 hr |
| Mar 28, 8:32 PM MDT | Winter Storm Warning | CYS | 47 hr |
| Mar 29, 4:29 PM MDT | Blizzard Warning | CYS | 14 hr |
| Apr 16, 2:00 AM MDT | Winter Weather Advisory | CYS | 37 hr |
| Apr 26, 1:39 AM MDT | Winter Weather Advisory | CYS | 13 hr |
| Apr 28, 3:03 AM MDT | Winter Weather Advisory | CYS | 65 hr |
| May 19, 1:56 PM MDT | Special Weather Statement | CYS | 34 min |
| May 20, 4:15 PM MDT | Special Weather Statement | CYS | 30 min |
| May 20, 4:26 PM MDT | Severe Thunderstorm Warning | CYS | 34 min |
| May 20, 5:44 PM MDT | Special Weather Statement | CYS | 46 min |
| May 20, 5:48 PM MDT | Mesoscale Discussion | SPC | 87 min |
| May 21, 2:54 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 21, 8:16 PM MDT | Mesoscale Discussion | SPC | 89 min |
| May 24, 2:30 PM MDT | Special Weather Statement | CYS | 45 min |
| May 24, 3:30 PM MDT | Special Weather Statement | CYS | 45 min |
| May 24, 3:48 PM MDT | Severe Thunderstorm Warning | CYS | 42 min |
| Jun 8, 4:21 PM MDT | Special Weather Statement | CYS | 39 min |
| Jun 8, 4:49 PM MDT | Severe Thunderstorm Warning | CYS | 42 min |
| Jun 9, 8:34 PM MDT | Special Weather Statement | CYS | 41 min |
| Jun 9, 9:01 PM MDT | Special Weather Statement | CYS | 59 min |
| Jun 11, 7:26 PM MDT | Special Weather Statement | CYS | 64 min |
| Jun 12, 4:53 PM MDT | Severe Thunderstorm Warning | CYS | 21 min |
| Jun 13, 12:00 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jun 13, 12:45 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 13, 2:51 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jun 13, 6:00 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jun 17, 7:28 PM MDT | Special Weather Statement | CYS | 47 min |
| Jun 27, 6:11 PM MDT | Special Weather Statement | CYS | 49 min |
| Jun 27, 6:25 PM MDT | Severe Thunderstorm Warning | CYS | 36 min |
| Jun 28, 12:55 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jun 28, 1:37 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 3:36 PM MDT | Special Weather Statement | CYS | 39 min |
| Jun 28, 3:58 PM MDT | Severe Thunderstorm Warning | CYS | 38 min |
| Jun 28, 4:02 PM MDT | Severe Thunderstorm Warning | CYS | 58 min |
| Jun 28, 4:25 PM MDT | Special Weather Statement | CYS | 65 min |
| Jun 28, 4:26 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jun 28, 4:34 PM MDT | Severe Thunderstorm Warning | CYS | 28 min |
| Jun 29, 12:47 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jun 29, 7:06 PM MDT | Severe Thunderstorm Warning | CYS | 39 min |
| Jun 29, 8:38 PM MDT | Special Weather Statement | CYS | 52 min |
| Jun 29, 9:26 PM MDT | Special Weather Statement | CYS | 34 min |
| Jul 1, 5:37 PM MDT | Special Weather Statement | CYS | 38 min |
| Jul 1, 6:00 PM MDT | Severe Thunderstorm Warning | CYS | 60 min |
| Jul 5, 6:17 PM MDT | Special Weather Statement | CYS | 43 min |
| Jul 6, 2:15 PM MDT | Special Weather Statement | CYS | 45 min |
| Jul 6, 2:55 PM MDT | Special Weather Statement | CYS | 50 min |
| Jul 6, 3:47 PM MDT | Severe Thunderstorm Warning | CYS | 28 min |
| Jul 6, 7:04 PM MDT | Severe Thunderstorm Warning | CYS | 41 min |
| Jul 6, 7:52 PM MDT | Special Weather Statement | CYS | 53 min |
| Jul 17, 6:18 PM MDT | Special Weather Statement | CYS | 57 min |
| Jul 17, 6:25 PM MDT | Severe Thunderstorm Warning | CYS | 65 min |
| Jul 17, 7:44 PM MDT | Special Weather Statement | CYS | 46 min |
| Jul 18, 3:07 PM MDT | Special Weather Statement | CYS | 38 min |
| Jul 18, 3:43 PM MDT | Special Weather Statement | CYS | 32 min |
| Jul 18, 3:53 PM MDT | Special Weather Statement | CYS | 67 min |
| Jul 18, 3:58 PM MDT | Severe Thunderstorm Warning | CYS | 43 min |
| Jul 22, 1:16 PM MDT | Special Weather Statement | CYS | 44 min |
| Jul 22, 1:45 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jul 24, 5:55 PM MDT | Special Weather Statement | CYS | 50 min |
| Jul 26, 4:32 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jul 27, 1:36 AM MDT | Special Weather Statement | CYS | 39 min |
| Jul 27, 4:14 AM MDT | Special Weather Statement | CYS | 46 min |
| Jul 27, 5:24 AM MDT | Special Weather Statement | CYS | 51 min |
| Jul 27, 2:41 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 6:25 PM MDT | Severe Thunderstorm Warning | CYS | 50 min |
| Jul 27, 6:59 PM MDT | Severe Thunderstorm Warning | CYS | 46 min |
| Jul 27, 7:37 PM MDT | Tornado Warning | CYS | 38 min |
| Jul 27, 8:10 PM MDT | Tornado Warning | CYS | 50 min |
| Jul 28, 1:54 AM MDT | Special Weather Statement | CYS | 66 min |
| Jul 28, 6:39 AM MDT | Special Weather Statement | CYS | 66 min |
| Jul 28, 7:40 AM MDT | Special Weather Statement | CYS | 50 min |
| Jul 28, 8:10 AM MDT | Severe Thunderstorm Warning | CYS | 35 min |
| Jul 29, 3:00 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jul 29, 4:13 PM MDT | Severe Thunderstorm Warning | CYS | 20 min |
| Jul 29, 5:01 PM MDT | Special Weather Statement | CYS | 44 min |
| Jul 29, 5:27 PM MDT | Mesoscale Discussion | SPC | 108 min |
| Jul 30, 2:32 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 12:00 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jul 31, 4:42 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 7:03 PM MDT | Special Weather Statement | CYS | 42 min |
| Jul 31, 7:46 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Aug 7, 8:37 PM MDT | Special Weather Statement | CYS | 38 min |
| Aug 8, 2:38 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Aug 8, 3:50 PM MDT | Special Weather Statement | CYS | 40 min |
| Aug 9, 3:16 PM MDT | Special Weather Statement | CYS | 44 min |
| Aug 9, 3:51 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Aug 9, 4:08 PM MDT | Special Weather Statement | CYS | 52 min |
| Aug 9, 7:54 PM MDT | Special Weather Statement | CYS | 51 min |
| Aug 10, 4:18 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Aug 11, 1:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 5:08 PM MDT | Special Weather Statement | CYS | 52 min |
| Aug 11, 5:32 PM MDT | Severe Thunderstorm Warning | CYS | 43 min |
| Aug 11, 6:20 PM MDT | Special Weather Statement | CYS | 25 min |
| Aug 15, 2:30 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Aug 27, 5:48 AM MDT | Dense Fog Advisory | CYS | 4 hr |
| Sep 4, 1:48 PM MDT | Special Weather Statement | CYS | 42 min |
| Sep 4, 2:46 PM MDT | Special Weather Statement | CYS | 44 min |
| Sep 4, 3:13 PM MDT | Special Weather Statement | CYS | 47 min |
| Sep 5, 5:09 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 14, 4:42 PM MDT | Severe Thunderstorm Warning | CYS | 48 min |
| Sep 23, 1:23 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Sep 23, 2:21 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 23, 4:08 PM MDT | Severe Thunderstorm Warning | CYS | 52 min |
| Sep 23, 5:01 PM MDT | Severe Thunderstorm Warning | CYS | 44 min |
| Sep 23, 5:35 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Oct 5, 2:28 AM MDT | Freeze Warning | CYS | 31 hr |
| Oct 16, 2:48 PM MDT | High Wind Warning | CYS | 28 hr |
| Nov 16, 4:14 AM MST | Winter Storm Watch | CYS | 10 hr |
| Nov 16, 2:33 PM MST | Winter Weather Advisory | CYS | 32 hr |
| Nov 29, 2:13 AM MST | High Wind Warning | CYS | 15 hr |
| Dec 6, 7:08 PM MST | Wind Chill Advisory | CYS | 14 hr |
| Dec 7, 2:21 PM MST | Wind Chill Advisory | CYS | 19 hr |
| Dec 14, 2:43 AM MST | Winter Storm Watch | CYS | 36 hr |
| Dec 15, 3:06 PM MST | Winter Storm Warning | CYS | 35 hr |
| Dec 16, 1:38 PM MST | Wind Chill Warning | CYS | 21 hr |
| Dec 17, 12:45 PM MST | Wind Chill Warning | CYS | 20 hr |
| Dec 23, 2:36 AM MST | Winter Storm Watch | CYS | 25 hr |
| Dec 24, 3:51 AM MST | Winter Storm Warning | CYS | 57 hr |
| Dec 25, 3:32 AM MST | Mesoscale Discussion | SPC | 6 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 | 22 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 27 |
| Special Weather Statement | 45 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 4 |
| Blizzard Watch | 1 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 5 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Warning | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
| 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 archive20152017
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.