Alert archive / Wyoming / Big Horn County
Weather alerts in Big Horn County, Wyoming, 2018
157 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Big Horn County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 157
- Warnings
- 35
- Watches
- 14
- Advisories
- 18
- Busiest month
- June51 alerts
- Busiest day
- June 29, 201813 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 6 tornado warnings covering Big Horn County in 2018 had a tornado report inside them.
Big Horn County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 21 | 6 | 71% | 13 | 77% | 14 min |
| Flash flood warnings | 2 | 1 | 50% | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Riverton, WY: tornado warnings | 19 | 0 | 100% | 1 | 0% | |
| NWS Riverton, WY: severe thunderstorm warnings | 111 | 25 | 77% | 68 | 68% | 19 min |
| NWS Riverton, WY: flash flood warnings | 18 | 2 | 89% | 3 | 67% | 46 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, 10:47 AM MST | Winter Weather Advisory | RIW | 42 hr |
| Feb 3, 2:31 AM MST | Winter Weather Advisory | RIW | 33 hr |
| Feb 4, 1:25 AM MST | Winter Weather Advisory | RIW | 40 hr |
| Feb 7, 12:25 PM MST | Winter Storm Watch | RIW | 23 hr |
| Feb 8, 2:33 AM MST | Winter Storm Warning | RIW | 38 hr |
| Feb 8, 2:33 AM MST | Winter Weather Advisory | RIW | 52 hr |
| Feb 17, 2:34 PM MST | Winter Weather Advisory | RIW | 53 hr |
| Mar 17, 5:43 PM MDT | Special Weather Statement | RIW | 47 min |
| Mar 24, 2:17 AM MDT | Winter Storm Watch | RIW | 24 hr |
| Mar 25, 2:04 AM MDT | Winter Weather Advisory | RIW | 37 hr |
| Mar 27, 3:47 PM MDT | Winter Weather Advisory | RIW | 32 hr |
| Apr 1, 3:34 AM MDT | Winter Storm Watch | RIW | 23 hr |
| Apr 1, 3:51 AM MDT | High Wind Watch | RIW | 22 hr |
| Apr 1, 12:48 PM MDT | High Wind Warning | RIW | 31 hr |
| Apr 2, 2:20 AM MDT | Winter Weather Advisory | RIW | 25 hr |
| Apr 4, 2:28 AM MDT | Winter Storm Watch | RIW | 24 hr |
| Apr 5, 2:47 AM MDT | Winter Weather Advisory | RIW | 33 hr |
| Apr 10, 2:15 PM MDT | Winter Storm Watch | RIW | 22 hr |
| Apr 11, 12:43 PM MDT | Winter Weather Advisory | RIW | 45 hr |
| Apr 29, 2:41 AM MDT | Winter Storm Watch | RIW | 20 hr |
| Apr 29, 1:16 PM MDT | Special Weather Statement | RIW | 29 min |
| Apr 29, 2:01 PM MDT | Special Weather Statement | RIW | 29 min |
| Apr 29, 2:10 PM MDT | Special Weather Statement | RIW | 20 min |
| Apr 29, 2:24 PM MDT | Special Weather Statement | RIW | 36 min |
| Apr 29, 2:39 PM MDT | Special Weather Statement | RIW | 36 min |
| Apr 29, 3:04 PM MDT | Special Weather Statement | RIW | 26 min |
| Apr 29, 10:16 PM MDT | Winter Storm Warning | RIW | 32 hr |
| May 5, 6:35 PM MDT | Special Weather Statement | RIW | 40 min |
| May 10, 1:00 PM MDT | Winter Storm Watch | RIW | 7 hr |
| May 10, 8:05 PM MDT | Winter Storm Warning | RIW | 57 hr |
| May 17, 1:55 PM MDT | Special Weather Statement | RIW | 35 min |
| May 21, 2:44 PM MDT | Severe Thunderstorm Warning | RIW | 30 min |
| May 21, 4:18 PM MDT | Special Weather Statement | RIW | 27 min |
| May 21, 4:31 PM MDT | Severe Thunderstorm Warning | RIW | 44 min |
| May 22, 9:16 AM MDT | Flood Watch | RIW | 27 hr |
| May 22, 5:46 PM MDT | Special Weather Statement | RIW | 44 min |
| May 22, 7:10 PM MDT | Special Weather Statement | RIW | 35 min |
| May 22, 7:42 PM MDT | Flash Flood Warning | RIW | 3 hr |
| May 22, 8:00 PM MDT | Special Weather Statement | RIW | 45 min |
| May 23, 1:47 PM MDT | Special Weather Statement | RIW | 28 min |
| May 23, 1:58 PM MDT | Special Weather Statement | RIW | 32 min |
| May 23, 2:17 PM MDT | Special Weather Statement | RIW | 28 min |
| May 23, 2:34 PM MDT | Special Weather Statement | RIW | 26 min |
| May 23, 2:44 PM MDT | Special Weather Statement | RIW | 31 min |
| May 23, 2:52 PM MDT | Special Weather Statement | RIW | 23 min |
| May 23, 3:11 PM MDT | Special Weather Statement | RIW | 34 min |
| May 23, 3:28 PM MDT | Severe Thunderstorm Warning | RIW | 47 min |
| May 23, 3:51 PM MDT | Special Weather Statement | RIW | 24 min |
| May 26, 10:15 AM MDT | Flood Watch | RIW | 56 hr |
| May 26, 11:00 PM MDT | Areal Flood Warning | RIW | 12 hr |
| May 27, 4:38 PM MDT | Severe Thunderstorm Warning | RIW | 37 min |
| May 27, 5:21 PM MDT | Special Weather Statement | RIW | 39 min |
| May 27, 5:43 PM MDT | Severe Thunderstorm Warning | RIW | 47 min |
| May 27, 6:29 PM MDT | Severe Thunderstorm Warning | RIW | 46 min |
| May 31, 3:17 PM MDT | Special Weather Statement | RIW | 43 min |
| May 31, 4:00 PM MDT | Special Weather Statement | RIW | 45 min |
| May 31, 4:12 PM MDT | Severe Thunderstorm Warning | RIW | 48 min |
| May 31, 5:03 PM MDT | Special Weather Statement | RIW | 42 min |
| Jun 1, 9:29 AM MDT | Special Weather Statement | RIW | 31 min |
| Jun 1, 9:56 AM MDT | Severe Thunderstorm Warning | RIW | 15 min |
| Jun 1, 10:14 AM MDT | Special Weather Statement | RIW | 31 min |
| Jun 1, 10:57 AM MDT | Special Weather Statement | RIW | 33 min |
| Jun 1, 11:03 AM MDT | Special Weather Statement | RIW | 27 min |
| Jun 1, 11:35 AM MDT | Special Weather Statement | RIW | 25 min |
| Jun 1, 1:08 PM MDT | Flash Flood Warning | RIW | 3 hr |
| Jun 1, 4:30 PM MDT | Special Weather Statement | RIW | 30 min |
| Jun 6, 1:35 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jun 6, 3:18 PM MDT | Severe Thunderstorm Warning | RIW | 27 min |
| Jun 6, 3:45 PM MDT | Tornado Warning | RIW | 30 min |
| Jun 6, 4:17 PM MDT | Tornado Warning | RIW | 28 min |
| Jun 6, 4:49 PM MDT | Severe Thunderstorm Warning | RIW | 26 min |
| Jun 6, 5:50 PM MDT | Special Weather Statement | RIW | 40 min |
| Jun 6, 6:43 PM MDT | Severe Thunderstorm Warning | RIW | 47 min |
| Jun 6, 7:23 PM MDT | Severe Thunderstorm Warning | RIW | 21 min |
| Jun 6, 7:46 PM MDT | Special Weather Statement | RIW | 44 min |
| Jun 6, 8:31 PM MDT | Special Weather Statement | RIW | 44 min |
| Jun 7, 2:52 PM MDT | Special Weather Statement | RIW | 23 min |
| Jun 7, 3:15 PM MDT | Special Weather Statement | RIW | 30 min |
| Jun 7, 3:49 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 7, 4:07 PM MDT | Special Weather Statement | RIW | 23 min |
| Jun 7, 4:13 PM MDT | Special Weather Statement | RIW | 32 min |
| Jun 8, 4:49 PM MDT | Special Weather Statement | RIW | 26 min |
| Jun 15, 2:14 PM MDT | Special Weather Statement | RIW | 31 min |
| Jun 15, 3:43 PM MDT | Special Weather Statement | RIW | 32 min |
| Jun 15, 4:10 PM MDT | Special Weather Statement | RIW | 35 min |
| Jun 15, 4:44 PM MDT | Special Weather Statement | RIW | 16 min |
| Jun 18, 2:40 PM MDT | Areal Flood Advisory | RIW | 24 hr |
| Jun 18, 3:17 PM MDT | Special Weather Statement | RIW | 28 min |
| Jun 18, 3:39 PM MDT | Special Weather Statement | RIW | 36 min |
| Jun 18, 4:14 PM MDT | Special Weather Statement | RIW | 31 min |
| Jun 18, 5:06 PM MDT | Special Weather Statement | RIW | 39 min |
| Jun 21, 2:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jun 21, 4:42 PM MDT | Special Weather Statement | RIW | 48 min |
| Jun 21, 5:30 PM MDT | Special Weather Statement | RIW | 30 min |
| Jun 21, 6:06 PM MDT | Special Weather Statement | RIW | 24 min |
| Jun 22, 2:08 AM MDT | Flood Watch | RIW | 59 hr |
| Jun 28, 8:29 PM MDT | Special Weather Statement | RIW | 46 min |
| Jun 29, 10:39 AM MDT | Special Weather Statement | RIW | 36 min |
| Jun 29, 11:14 AM MDT | Tornado Warning | RIW | 16 min |
| Jun 29, 11:23 AM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 29, 11:28 AM MDT | Tornado Warning | RIW | 32 min |
| Jun 29, 11:33 AM MDT | Special Weather Statement | RIW | 42 min |
| Jun 29, 11:46 AM MDT | Special Weather Statement | RIW | 44 min |
| Jun 29, 11:58 AM MDT | Tornado Warning | RIW | 32 min |
| Jun 29, 12:15 PM MDT | Tornado Warning | RIW | 30 min |
| Jun 29, 12:30 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jun 29, 12:37 PM MDT | Special Weather Statement | RIW | 23 min |
| Jun 29, 12:59 PM MDT | Special Weather Statement | RIW | 46 min |
| Jun 29, 1:17 PM MDT | Severe Thunderstorm Warning | RIW | 43 min |
| Jul 10, 3:34 PM MDT | Special Weather Statement | RIW | 26 min |
| Jul 10, 4:19 PM MDT | Special Weather Statement | RIW | 41 min |
| Jul 10, 4:25 PM MDT | Special Weather Statement | RIW | 50 min |
| Jul 17, 3:24 PM MDT | Special Weather Statement | RIW | 21 min |
| Jul 17, 4:23 PM MDT | Severe Thunderstorm Warning | RIW | 37 min |
| Jul 18, 5:08 PM MDT | Special Weather Statement | RIW | 52 min |
| Jul 24, 3:12 PM MDT | Special Weather Statement | RIW | 63 min |
| Jul 26, 4:52 PM MDT | Severe Thunderstorm Warning | RIW | 38 min |
| Jul 26, 6:17 PM MDT | Severe Thunderstorm Warning | RIW | 43 min |
| Jul 26, 6:57 PM MDT | Severe Thunderstorm Warning | RIW | 48 min |
| Jul 26, 7:51 PM MDT | Severe Thunderstorm Warning | RIW | 39 min |
| Jul 27, 5:51 PM MDT | Severe Thunderstorm Warning | RIW | 39 min |
| Jul 27, 6:32 PM MDT | Special Weather Statement | RIW | 28 min |
| Jul 28, 6:42 PM MDT | Special Weather Statement | RIW | 33 min |
| Jul 29, 1:12 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 3:20 PM MDT | Special Weather Statement | RIW | 25 min |
| Aug 2, 2:40 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 2:47 PM MDT | Special Weather Statement | RIW | 28 min |
| Aug 2, 3:02 PM MDT | Severe Thunderstorm Warning | RIW | 43 min |
| Aug 2, 3:44 PM MDT | Severe Thunderstorm Warning | RIW | 31 min |
| Aug 2, 7:58 PM MDT | Special Weather Statement | RIW | 32 min |
| Aug 2, 8:24 PM MDT | Special Weather Statement | RIW | 36 min |
| Aug 2, 8:33 PM MDT | Special Weather Statement | RIW | 27 min |
| Aug 3, 1:48 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Aug 3, 2:00 PM MDT | Special Weather Statement | RIW | 30 min |
| Aug 3, 2:32 PM MDT | Special Weather Statement | RIW | 43 min |
| Aug 3, 3:53 PM MDT | Special Weather Statement | RIW | 52 min |
| Aug 5, 11:49 AM MDT | Special Weather Statement | RIW | 26 min |
| Aug 5, 12:16 PM MDT | Special Weather Statement | RIW | 29 min |
| Aug 5, 12:49 PM MDT | Special Weather Statement | RIW | 26 min |
| Aug 12, 3:34 PM MDT | Special Weather Statement | RIW | 86 min |
| Aug 14, 12:11 AM MDT | Special Weather Statement | RIW | 34 min |
| Aug 14, 3:21 PM MDT | Special Weather Statement | RIW | 39 min |
| Aug 20, 2:22 PM MDT | Special Weather Statement | RIW | 38 min |
| Aug 20, 2:43 PM MDT | Special Weather Statement | RIW | 32 min |
| Aug 22, 9:43 PM MDT | Special Weather Statement | RIW | 32 min |
| Aug 26, 12:49 PM MDT | Winter Weather Advisory | RIW | 41 hr |
| Sep 15, 3:11 AM MDT | Red Flag Warning | BYZ | 18 hr |
| Sep 20, 2:38 PM MDT | Special Weather Statement | RIW | 22 min |
| Sep 27, 1:41 AM MDT | Winter Weather Advisory | RIW | 32 hr |
| Oct 12, 1:00 PM MDT | Winter Weather Advisory | RIW | 41 hr |
| Nov 15, 9:55 PM MST | Winter Weather Advisory | RIW | 37 hr |
| Nov 23, 1:24 AM MST | Winter Weather Advisory | RIW | 43 hr |
| Nov 29, 1:28 PM MST | Winter Storm Watch | RIW | 13 hr |
| Dec 28, 2:58 PM MST | Winter Storm Watch | RIW | 29 hr |
| Dec 29, 3:07 PM MST | Winter Weather Advisory | RIW | 48 hr |
| Dec 30, 3:12 PM MST | Winter Weather Advisory | RIW | 23 hr |
| Dec 30, 8:48 PM MST | Mesoscale Discussion | SPC | 5 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 | 21 |
| Tornado Warning | 6 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 8 |
| Special Weather Statement | 82 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| Flood Watch | 3 |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 9 |
| Winter Weather Advisory | 17 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Fire | |
| Red Flag Warning | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.