Alert archive / Wyoming / Sweetwater County
Weather alerts in Sweetwater County, Wyoming, 2021
117 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sweetwater County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 117
- Warnings
- 48
- Watches
- 30
- Advisories
- 15
- Busiest month
- September19 alerts
- Busiest day
- May 16, 20219 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sweetwater County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 0 | 100% | 2 | 0% | |
| Flash flood warnings | 1 | 1 | 0% | 3 | 100% | 47 min |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Riverton, WY: tornado warnings | 1 | 0 | 100% | 0 | ||
| NWS Riverton, WY: severe thunderstorm warnings | 21 | 2 | 90% | 19 | 16% | 22 min |
| NWS Riverton, WY: flash flood warnings | 6 | 2 | 67% | 5 | 80% | 54 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 12, 2:21 AM MST | High Wind Watch | RIW | 24 hr |
| Jan 13, 2:50 AM MST | High Wind Warning | RIW | 38 hr |
| Jan 22, 5:26 AM MST | Winter Weather Advisory | RIW | 42 hr |
| Jan 27, 4:27 AM MST | Winter Weather Advisory | RIW | 40 hr |
| Feb 6, 2:30 AM MST | High Wind Watch | RIW | 12 hr |
| Feb 6, 2:40 PM MST | High Wind Warning | RIW | 26 hr |
| Feb 10, 3:43 PM MST | Winter Weather Advisory | RIW | 3 days |
| Feb 13, 2:43 AM MST | Wind Chill Warning | RIW | 32 hr |
| Feb 19, 3:31 AM MST | Winter Weather Advisory | RIW | 38 hr |
| Feb 20, 12:32 PM MST | High Wind Warning | RIW | 3 days |
| Mar 8, 3:50 AM MST | Winter Storm Watch | RIW | 23 hr |
| Mar 9, 3:09 AM MST | Winter Weather Advisory | RIW | 38 hr |
| Mar 11, 1:29 PM MST | Winter Storm Watch | RIW | 24 hr |
| Mar 12, 1:39 PM MST | Winter Storm Warning | RIW | 54 hr |
| Mar 27, 3:11 AM MDT | High Wind Watch | RIW | 33 hr |
| Mar 28, 1:44 AM MDT | High Wind Warning | RIW | 40 hr |
| Apr 13, 3:37 PM MDT | Winter Storm Watch | RIW | 13 hr |
| Apr 13, 3:37 PM MDT | Winter Storm Warning | RIW | 56 hr |
| Apr 13, 3:37 PM MDT | Winter Weather Advisory | RIW | 68 hr |
| May 15, 1:54 PM MDT | Mesoscale Discussion | SPC | 96 min |
| May 15, 5:44 PM MDT | Special Weather Statement | RIW | 31 min |
| May 15, 5:56 PM MDT | Special Weather Statement | RIW | 34 min |
| May 16, 1:49 PM MDT | Special Weather Statement | RIW | 26 min |
| May 16, 2:11 PM MDT | Special Weather Statement | RIW | 34 min |
| May 16, 2:18 PM MDT | Special Weather Statement | RIW | 27 min |
| May 16, 2:39 PM MDT | Special Weather Statement | RIW | 36 min |
| May 16, 2:41 PM MDT | Special Weather Statement | RIW | 34 min |
| May 16, 2:55 PM MDT | Areal Flood Advisory | RIW | 3 hr |
| May 16, 3:14 PM MDT | Special Weather Statement | RIW | 31 min |
| May 16, 3:44 PM MDT | Special Weather Statement | RIW | 31 min |
| May 16, 5:24 PM MDT | Areal Flood Advisory | RIW | 3 hr |
| May 17, 4:11 PM MDT | Special Weather Statement | RIW | 34 min |
| May 17, 4:40 PM MDT | Special Weather Statement | RIW | 35 min |
| May 22, 1:20 PM MDT | High Wind Watch | RIW | 13 hr |
| May 22, 1:20 PM MDT | High Wind Warning | RIW | 31 hr |
| Jun 9, 2:29 AM MDT | High Wind Watch | RIW | 12 hr |
| Jun 9, 2:29 PM MDT | High Wind Warning | RIW | 33 hr |
| Jun 25, 3:19 PM MDT | Special Weather Statement | RIW | 26 min |
| Jul 6, 1:38 PM MDT | Fire Weather Watch | RIW | 24 hr |
| Jul 7, 1:32 PM MDT | Red Flag Warning | RIW | 55 hr |
| Jul 12, 3:35 AM MDT | Fire Weather Watch | RIW | 11 hr |
| Jul 12, 2:06 PM MDT | Red Flag Warning | RIW | 33 hr |
| Jul 15, 3:33 PM MDT | Red Flag Warning | RIW | 29 hr |
| Jul 18, 11:35 AM MDT | Fire Weather Watch | RIW | 16 hr |
| Jul 19, 3:10 AM MDT | Red Flag Warning | RIW | 42 hr |
| Jul 19, 1:28 PM MDT | Red Flag Warning | RIW | 32 hr |
| Jul 28, 5:19 PM MDT | Special Weather Statement | RIW | 26 min |
| Jul 30, 2:58 AM MDT | Flash Flood Watch | RIW | 41 hr |
| Jul 30, 6:18 PM MDT | Flash Flood Warning | RIW | 3 hr |
| Jul 31, 6:15 PM MDT | Special Weather Statement | RIW | 15 min |
| Aug 1, 2:11 PM MDT | Flash Flood Watch | RIW | 33 hr |
| Aug 2, 6:31 PM MDT | Special Weather Statement | RIW | 44 min |
| Aug 2, 7:10 PM MDT | Special Weather Statement | RIW | 35 min |
| Aug 2, 7:48 PM MDT | Special Weather Statement | RIW | 27 min |
| Aug 2, 7:54 PM MDT | Areal Flood Advisory | RIW | 3 hr |
| Aug 4, 2:02 PM MDT | Fire Weather Watch | RIW | 24 hr |
| Aug 5, 2:03 PM MDT | Red Flag Warning | RIW | 30 hr |
| Aug 7, 2:05 PM MDT | Red Flag Warning | RIW | 3 days |
| Aug 16, 2:24 AM MDT | Fire Weather Watch | RIW | 11 hr |
| Aug 16, 1:50 PM MDT | Red Flag Warning | RIW | 31 hr |
| Aug 21, 9:11 PM MDT | Severe Thunderstorm Warning | RIW | 34 min |
| Aug 22, 12:38 PM MDT | Red Flag Warning | RIW | 31 hr |
| Aug 24, 2:53 AM MDT | Fire Weather Watch | RIW | 10 hr |
| Aug 24, 12:56 PM MDT | Red Flag Warning | RIW | 31 hr |
| Aug 26, 3:14 AM MDT | Red Flag Warning | RIW | 65 hr |
| Aug 30, 2:37 AM MDT | Red Flag Warning | RIW | 16 hr |
| Sep 3, 3:23 PM MDT | Severe Thunderstorm Warning | RIW | 37 min |
| Sep 3, 3:50 PM MDT | Special Weather Statement | RIW | 25 min |
| Sep 3, 4:11 PM MDT | Special Weather Statement | RIW | 34 min |
| Sep 3, 4:36 PM MDT | Special Weather Statement | RIW | 24 min |
| Sep 5, 2:13 AM MDT | Fire Weather Watch | RIW | 24 hr |
| Sep 5, 1:49 PM MDT | Red Flag Warning | RIW | 30 hr |
| Sep 9, 2:52 AM MDT | Fire Weather Watch | RIW | 23 hr |
| Sep 10, 1:51 AM MDT | Red Flag Warning | RIW | 18 hr |
| Sep 10, 4:23 PM MDT | Special Weather Statement | RIW | 22 min |
| Sep 13, 1:56 AM MDT | Special Weather Statement | RIW | 34 min |
| Sep 14, 1:36 AM MDT | Fire Weather Watch | RIW | 12 hr |
| Sep 14, 1:14 PM MDT | Red Flag Warning | RIW | 55 hr |
| Sep 16, 1:59 PM MDT | Red Flag Warning | RIW | 54 hr |
| Sep 19, 4:18 PM MDT | Freeze Watch | RIW | 22 hr |
| Sep 20, 1:52 PM MDT | Freeze Warning | RIW | 18 hr |
| Sep 21, 2:12 AM MDT | Fire Weather Watch | RIW | 11 hr |
| Sep 21, 1:37 PM MDT | Red Flag Warning | RIW | 30 hr |
| Sep 24, 1:45 AM MDT | Fire Weather Watch | RIW | 24 hr |
| Sep 25, 1:42 AM MDT | Red Flag Warning | RIW | 17 hr |
| Oct 3, 1:23 PM MDT | Red Flag Warning | RIW | 30 hr |
| Oct 9, 3:42 PM MDT | Winter Storm Watch | RIW | 24 hr |
| Oct 10, 4:03 PM MDT | Winter Storm Warning | RIW | 68 hr |
| Oct 10, 4:03 PM MDT | Winter Weather Advisory | RIW | 62 hr |
| Oct 17, 2:32 PM MDT | Winter Storm Watch | RIW | 24 hr |
| Oct 18, 3:53 AM MDT | Winter Weather Advisory | RIW | 43 hr |
| Oct 23, 2:03 PM MDT | High Wind Watch | RIW | 24 hr |
| Oct 24, 2:13 PM MDT | High Wind Warning | RIW | 31 hr |
| Nov 9, 2:19 AM MST | Dense Fog Advisory | RIW | 6 hr |
| Nov 14, 2:48 AM MST | High Wind Watch | RIW | 35 hr |
| Nov 15, 3:58 AM MST | High Wind Warning | RIW | 40 hr |
| Nov 22, 3:14 AM MST | High Wind Watch | RIW | 12 hr |
| Nov 22, 3:01 PM MST | High Wind Warning | RIW | 24 hr |
| Dec 3, 9:11 AM MST | High Wind Warning | RIW | 54 hr |
| Dec 4, 8:09 AM MST | High Wind Watch | RIW | 11 hr |
| Dec 8, 2:20 AM MST | Winter Weather Advisory | RIW | 57 hr |
| Dec 10, 2:28 PM MST | High Wind Warning | RIW | 51 hr |
| Dec 12, 7:13 PM MST | High Wind Watch | RIW | 25 hr |
| Dec 13, 2:28 AM MST | High Wind Warning | RIW | 42 hr |
| Dec 22, 3:17 AM MST | High Wind Watch | RIW | 22 hr |
| Dec 22, 1:56 PM MST | Winter Storm Warning | RIW | 57 hr |
| Dec 22, 1:56 PM MST | Winter Weather Advisory | RIW | 12 hr |
| Dec 23, 1:16 AM MST | High Wind Warning | RIW | 19 hr |
| Dec 23, 1:44 AM MST | Winter Weather Advisory | RIW | 25 hr |
| Dec 25, 1:52 PM MST | High Wind Warning | RIW | 29 hr |
| Dec 26, 9:31 AM MST | Snow Squall Warning | RIW | 44 min |
| Dec 26, 10:12 AM MST | Snow Squall Warning | RIW | 48 min |
| Dec 26, 11:00 AM MST | Snow Squall Warning | RIW | 45 min |
| Dec 26, 11:00 AM MST | Mesoscale Discussion | SPC | 3 hr |
| Dec 26, 11:38 AM MST | Snow Squall Warning | RIW | 52 min |
| Dec 27, 8:51 PM MST | Snow Squall Warning | RIW | 54 min |
| Dec 29, 2:00 PM MST | High Wind Warning | RIW | 29 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 | 2 |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 22 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 2 |
| Areal Flood Advisory | 3 |
| Winter | |
| Snow Squall Warning | 5 |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 11 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Warning | 1 |
| Freeze Watch | 1 |
| Wind and dust | |
| High Wind Warning | 15 |
| High Wind Watch | 11 |
| Fire | |
| Red Flag Warning | 19 |
| Fire Weather Watch | 11 |
| 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 archive20202022
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.