Alert archive / Wyoming / Sheridan County
Weather alerts in Sheridan County, Wyoming, 2015
77 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sheridan County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 77
- Warnings
- 21
- Watches
- 11
- Advisories
- 3
- Busiest month
- June36 alerts
- Busiest day
- June 19, 20155 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sheridan County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 4 | 50% | 5 | 40% | 6 min |
| Flash flood warnings | 2 | 2 | 0% | 8 | 63% | 76 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Billings, MT: tornado warnings | 3 | 0 | 100% | 0 | ||
| NWS Billings, MT: severe thunderstorm warnings | 91 | 58 | 36% | 169 | 71% | 23 min |
| NWS Billings, MT: flash flood warnings | 11 | 5 | 55% | 30 | 57% | 50 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 19, 4:10 AM MST | Special Weather Statement | BYZ | 50 min |
| Mar 27, 3:17 AM MDT | Fire Weather Watch | BYZ | 9 hr |
| Mar 27, 12:45 PM MDT | Red Flag Warning | BYZ | 32 hr |
| Mar 30, 3:42 AM MDT | Fire Weather Watch | BYZ | 9 hr |
| Mar 30, 12:30 PM MDT | Red Flag Warning | BYZ | 56 hr |
| Apr 11, 4:03 AM MDT | Red Flag Warning | BYZ | 40 hr |
| Apr 13, 4:01 AM MDT | Fire Weather Watch | BYZ | 10 hr |
| Apr 13, 2:20 PM MDT | Red Flag Warning | BYZ | 31 hr |
| May 4, 5:52 PM MDT | Special Weather Statement | RIW | 38 min |
| May 4, 6:54 PM MDT | Special Weather Statement | RIW | 36 min |
| May 14, 6:26 PM MDT | Special Weather Statement | RIW | 34 min |
| May 16, 5:43 PM MDT | Special Weather Statement | RIW | 32 min |
| May 24, 6:50 PM MDT | Areal Flood Advisory | BYZ | 11 hr |
| May 24, 10:15 PM MDT | River Flood Warning | BYZ | 38 hr |
| May 25, 6:11 AM MDT | Areal Flood Advisory | BYZ | 60 hr |
| May 25, 2:54 PM MDT | Areal Flood Warning | BYZ | 72 hr |
| May 29, 5:17 AM MDT | Areal Flood Advisory | BYZ | 33 hr |
| May 30, 7:57 PM MDT | Special Weather Statement | BYZ | 63 min |
| May 30, 8:04 PM MDT | Severe Thunderstorm Warning | BYZ | 26 min |
| Jun 1, 7:14 PM MDT | Special Weather Statement | BYZ | 61 min |
| Jun 2, 12:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 2, 5:33 PM MDT | Severe Thunderstorm Warning | BYZ | 57 min |
| Jun 2, 6:18 PM MDT | Severe Thunderstorm Warning | BYZ | 17 min |
| Jun 3, 12:00 PM MDT | Flood Watch | BYZ | 66 hr |
| Jun 3, 7:52 PM MDT | Special Weather Statement | BYZ | 53 min |
| Jun 3, 10:46 PM MDT | River Flood Warning | BYZ | 48 hr |
| Jun 5, 4:08 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 5, 6:01 PM MDT | Special Weather Statement | BYZ | 44 min |
| Jun 5, 6:18 PM MDT | Severe Thunderstorm Warning | BYZ | 28 min |
| Jun 5, 6:43 PM MDT | Flash Flood Warning | BYZ | 3 hr |
| Jun 5, 9:41 PM MDT | Areal Flood Warning | BYZ | 24 hr |
| Jun 10, 2:33 AM MDT | Flash Flood Watch | BYZ | 21 hr |
| Jun 10, 2:32 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jun 10, 6:40 PM MDT | Special Weather Statement | BYZ | 50 min |
| Jun 10, 7:27 PM MDT | Special Weather Statement | BYZ | 63 min |
| Jun 10, 8:35 PM MDT | Flash Flood Warning | BYZ | 3 hr |
| Jun 11, 12:07 AM MDT | Areal Flood Warning | BYZ | 23 hr |
| Jun 12, 9:35 PM MDT | Special Weather Statement | BYZ | 55 min |
| Jun 12, 9:47 PM MDT | Special Weather Statement | BYZ | 58 min |
| Jun 13, 9:33 PM MDT | Special Weather Statement | BYZ | 57 min |
| Jun 16, 8:28 PM MDT | Special Weather Statement | BYZ | 62 min |
| Jun 17, 2:32 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jun 17, 4:40 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 17, 7:25 PM MDT | Severe Thunderstorm Warning | BYZ | 65 min |
| Jun 18, 3:57 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 18, 10:10 PM MDT | Special Weather Statement | BYZ | 65 min |
| Jun 18, 10:20 PM MDT | Severe Thunderstorm Warning | BYZ | 55 min |
| Jun 18, 11:10 PM MDT | Severe Thunderstorm Warning | BYZ | 65 min |
| Jun 19, 2:04 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jun 19, 2:51 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 19, 6:38 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jun 21, 8:57 PM MDT | Special Weather Statement | BYZ | 63 min |
| Jun 25, 6:46 AM MDT | Mesoscale Discussion | SPC | 89 min |
| Jun 28, 4:56 PM MDT | Special Weather Statement | BYZ | 64 min |
| Jun 28, 5:16 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jul 2, 12:43 PM MDT | Special Weather Statement | RIW | 47 min |
| Jul 14, 6:02 PM MDT | Special Weather Statement | BYZ | 58 min |
| Jul 14, 6:09 PM MDT | Special Weather Statement | RIW | 51 min |
| Jul 14, 6:43 PM MDT | Special Weather Statement | BYZ | 62 min |
| Jul 16, 7:09 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jul 24, 9:49 PM MDT | Special Weather Statement | BYZ | 56 min |
| Jul 24, 10:06 PM MDT | Special Weather Statement | RIW | 24 min |
| Jul 25, 2:46 PM MDT | Fire Weather Watch | BYZ | 24 hr |
| Jul 26, 2:42 PM MDT | Red Flag Warning | BYZ | 31 hr |
| Jul 27, 1:44 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 2:58 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 4:25 PM MDT | Special Weather Statement | BYZ | 35 min |
| Jul 27, 5:04 PM MDT | Severe Thunderstorm Warning | BYZ | 41 min |
| Aug 3, 11:10 PM MDT | Special Weather Statement | BYZ | 110 min |
| Aug 5, 5:35 PM MDT | Special Weather Statement | BYZ | 55 min |
| Aug 17, 1:10 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 17, 2:47 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 17, 5:21 PM MDT | Special Weather Statement | BYZ | 54 min |
| Aug 17, 6:16 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Aug 27, 6:29 PM MDT | Special Weather Statement | BYZ | 31 min |
| Sep 5, 6:00 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Oct 11, 3:14 AM MDT | Red Flag Warning | BYZ | 17 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20142016
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.