Alert archive / Wyoming / Sheridan County
Weather alerts in Sheridan County, Wyoming, 2020
89 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 89
- Warnings
- 19
- Watches
- 16
- Advisories
- 17
- Busiest month
- June12 alerts
- Busiest day
- June 6, 20203 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, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 1 | 0% | |||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Cheyenne, WY: tornado warnings | 6 | 1 | 83% | 6 | 50% | 14 min |
| NWS Cheyenne, WY: severe thunderstorm warnings | 154 | 76 | 51% | 255 | 75% | 23 min |
| NWS Cheyenne, WY: flash flood warnings | 5 | 2 | 60% | 3 | 67% | 30 min |
| NWS Riverton, WY: severe thunderstorm warnings | 45 | 12 | 73% | 41 | 39% | 22 min |
| NWS Riverton, WY: flash flood warnings | 2 | 0 | 100% | 0 | ||
| NWS Rapid City, SD: tornado warnings | 11 | 2 | 82% | 11 | 27% | 18 min |
| NWS Rapid City, SD: severe thunderstorm warnings | 415 | 336 | 19% | 828 | 89% | 27 min |
| NWS Rapid City, SD: flash flood warnings | 10 | 7 | 30% | 11 | 91% | 88 min |
| NWS Billings, MT: severe thunderstorm warnings | 71 | 41 | 42% | 143 | 55% | 29 min |
| NWS Salt Lake City, UT: severe thunderstorm warnings | 34 | 19 | 44% | 93 | 40% | 17 min |
| NWS Salt Lake City, UT: flash flood warnings | 21 | 10 | 52% | 18 | 83% | 77 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 4, 5:22 PM MST | Special Weather Statement | BYZ | 113 min |
| Jan 9, 2:34 AM MST | Winter Weather Advisory | BYZ | 29 hr |
| Jan 13, 3:37 AM MST | Dense Fog Advisory | BYZ | 5 hr |
| Jan 27, 7:47 AM MST | Special Weather Statement | BYZ | 118 min |
| Jan 31, 12:27 PM MST | Winter Storm Watch | BYZ | 26 hr |
| Feb 1, 2:15 PM MST | Winter Storm Warning | BYZ | 56 hr |
| Feb 3, 3:26 PM MST | Winter Storm Watch | BYZ | 43 hr |
| Feb 5, 10:05 AM MST | Winter Weather Advisory | BYZ | 52 hr |
| Feb 8, 2:05 AM MST | Winter Weather Advisory | BYZ | 30 hr |
| Feb 11, 2:45 AM MST | Winter Weather Advisory | BYZ | 43 hr |
| Feb 15, 1:18 PM MST | Winter Weather Advisory | BYZ | 45 hr |
| Feb 17, 9:10 AM MST | Special Weather Statement | BYZ | 3 hr |
| Feb 23, 3:11 PM MST | Winter Weather Advisory | BYZ | 43 hr |
| Feb 26, 6:58 PM MST | Winter Weather Advisory | BYZ | 13 hr |
| Mar 2, 3:08 AM MST | High Wind Warning | BYZ | 65 hr |
| Mar 5, 11:46 AM MST | Areal Flood Advisory | BYZ | 52 hr |
| Mar 11, 3:14 AM MDT | Winter Weather Advisory | BYZ | 30 hr |
| Mar 15, 2:46 AM MDT | Special Weather Statement | BYZ | 3 hr |
| Mar 15, 5:47 AM MDT | Special Weather Statement | BYZ | 118 min |
| Mar 30, 2:39 PM MDT | Winter Storm Warning | BYZ | 69 hr |
| Mar 31, 3:23 AM MDT | Winter Weather Advisory | BYZ | 61 hr |
| Apr 9, 3:21 AM MDT | Winter Storm Watch | BYZ | 24 hr |
| Apr 10, 3:01 AM MDT | Winter Storm Warning | BYZ | 56 hr |
| Apr 14, 3:10 AM MDT | Winter Weather Advisory | BYZ | 45 hr |
| May 5, 2:45 PM MDT | High Wind Watch | BYZ | 20 hr |
| May 6, 3:46 AM MDT | High Wind Warning | BYZ | 35 hr |
| May 7, 3:28 AM MDT | Winter Weather Advisory | BYZ | 11 hr |
| May 31, 2:35 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jun 4, 5:07 PM MDT | Special Weather Statement | BYZ | 38 min |
| Jun 4, 5:45 PM MDT | Special Weather Statement | BYZ | 30 min |
| Jun 6, 5:17 AM MDT | Special Weather Statement | BYZ | 118 min |
| Jun 6, 12:27 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jun 6, 5:05 PM MDT | Special Weather Statement | BYZ | 55 min |
| Jun 7, 2:34 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jun 7, 4:47 PM MDT | Special Weather Statement | BYZ | 43 min |
| Jun 27, 8:57 PM MDT | Special Weather Statement | RIW | 33 min |
| Jun 27, 9:28 PM MDT | Special Weather Statement | RIW | 32 min |
| Jun 28, 1:11 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 2:03 PM MDT | Special Weather Statement | RIW | 27 min |
| Jun 30, 5:23 PM MDT | Special Weather Statement | BYZ | 37 min |
| Jul 5, 3:00 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 4:13 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 7, 1:14 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 7, 6:12 PM MDT | Special Weather Statement | BYZ | 63 min |
| Jul 22, 3:01 PM MDT | Special Weather Statement | RIW | 59 min |
| Jul 23, 1:56 PM MDT | Fire Weather Watch | BYZ | 24 hr |
| Jul 30, 1:27 PM MDT | Special Weather Statement | RIW | 48 min |
| Aug 3, 12:20 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Aug 6, 6:28 PM MDT | Special Weather Statement | RIW | 32 min |
| Aug 8, 6:12 PM MDT | Special Weather Statement | BYZ | 48 min |
| Aug 11, 1:49 PM MDT | Red Flag Warning | BYZ | 31 hr |
| Aug 16, 1:02 PM MDT | Heat Advisory | BYZ | 55 hr |
| Aug 17, 2:11 PM MDT | Red Flag Warning | BYZ | 30 hr |
| Aug 25, 10:58 PM MDT | Special Weather Statement | BYZ | 62 min |
| Aug 27, 1:27 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 27, 8:38 PM MDT | Special Weather Statement | BYZ | 37 min |
| Aug 27, 9:28 PM MDT | Special Weather Statement | BYZ | 47 min |
| Aug 30, 2:17 PM MDT | Fire Weather Watch | BYZ | 13 hr |
| Aug 31, 3:27 AM MDT | Red Flag Warning | BYZ | 69 hr |
| Sep 3, 3:14 AM MDT | Fire Weather Watch | BYZ | 32 hr |
| Sep 4, 11:14 AM MDT | Red Flag Warning | BYZ | 57 hr |
| Sep 6, 3:09 AM MDT | Winter Weather Advisory | BYZ | 51 hr |
| Sep 7, 3:15 AM MDT | Winter Storm Warning | BYZ | 26 hr |
| Sep 12, 2:46 AM MDT | Fire Weather Watch | BYZ | 24 hr |
| Sep 13, 3:11 AM MDT | Red Flag Warning | BYZ | 42 hr |
| Sep 17, 2:38 PM MDT | Fire Weather Watch | BYZ | 23 hr |
| Sep 18, 1:53 PM MDT | Red Flag Warning | BYZ | 31 hr |
| Sep 22, 1:46 PM MDT | Fire Weather Watch | BYZ | 24 hr |
| Sep 23, 1:22 PM MDT | Red Flag Warning | BYZ | 31 hr |
| Sep 25, 10:53 AM MDT | Red Flag Warning | BYZ | 33 hr |
| Oct 13, 3:20 AM MDT | High Wind Watch | BYZ | 12 hr |
| Oct 13, 2:57 PM MDT | High Wind Warning | BYZ | 27 hr |
| Oct 16, 2:32 PM MDT | Winter Weather Advisory | BYZ | 4 days |
| Oct 20, 3:33 AM MDT | Winter Storm Watch | BYZ | 25 hr |
| Oct 21, 4:34 AM MDT | Winter Storm Warning | BYZ | 37 hr |
| Oct 22, 2:31 PM MDT | Winter Storm Watch | BYZ | 24 hr |
| Oct 23, 3:58 AM MDT | Winter Storm Warning | BYZ | 50 hr |
| Oct 23, 3:58 AM MDT | Winter Weather Advisory | BYZ | 50 hr |
| Nov 13, 4:12 AM MST | High Wind Warning | BYZ | 38 hr |
| Nov 13, 3:42 PM MST | Special Weather Statement | BYZ | 6 hr |
| Nov 25, 8:04 PM MST | Special Weather Statement | BYZ | 3 hr |
| Dec 1, 9:56 AM MST | Special Weather Statement | BYZ | 109 min |
| Dec 11, 2:23 AM MST | Special Weather Statement | BYZ | 4 hr |
| Dec 11, 6:11 AM MST | Special Weather Statement | BYZ | 4 hr |
| Dec 14, 2:54 PM MST | Special Weather Statement | BYZ | 3 hr |
| Dec 21, 11:00 AM MST | High Wind Watch | BYZ | 15 hr |
| Dec 22, 2:18 AM MST | High Wind Warning | BYZ | 24 hr |
| Dec 28, 5:38 PM MST | Special Weather Statement | BYZ | 3 hr |
| Dec 28, 8:30 PM MST | Special Weather Statement | BYZ | 2 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 Watch | 2 |
| Mesoscale Discussion | 7 |
| Special Weather Statement | 30 |
| Flooding | |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 6 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 14 |
| Heat | |
| Heat Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 5 |
| High Wind Watch | 3 |
| Fire | |
| Red Flag Warning | 8 |
| Fire Weather Watch | 6 |
| 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 archive20192021
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.