Alert archive / Wyoming / Fremont County
Weather alerts in Fremont County, Wyoming, 2025
211 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Fremont County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 211
- Warnings
- 71
- Watches
- 32
- Advisories
- 42
- Busiest month
- July48 alerts
- Busiest day
- July 15, 20258 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Fremont County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 27 | 3 | 89% | 21 | 14% | 6 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Riverton, WY: tornado warnings | 1 | 0 | 100% | 1 | 0% | |
| NWS Riverton, WY: severe thunderstorm warnings | 108 | 21 | 81% | 104 | 26% | 15 min |
| NWS Riverton, WY: flash flood warnings | 1 | 0 | 100% | 0 |
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 1, 12:15 PM MST | Winter Storm Warning | RIW | 22 hr |
| Jan 5, 11:50 AM MST | Dense Fog Advisory | RIW | 21 hr |
| Jan 10, 2:09 AM MST | Winter Weather Advisory | RIW | 3 days |
| Jan 16, 1:29 AM MST | Winter Weather Advisory | RIW | 49 hr |
| Jan 17, 2:39 PM MST | Winter Storm Warning | RIW | 17 hr |
| Jan 18, 8:07 PM MST | Cold Weather Advisory | RIW | 62 hr |
| Jan 20, 1:39 PM MST | High Wind Warning | RIW | 27 hr |
| Jan 21, 12:36 PM MST | Winter Weather Advisory | RIW | 40 hr |
| Jan 29, 1:15 PM MST | Winter Storm Watch | RIW | 24 hr |
| Jan 30, 12:15 PM MST | High Wind Watch | RIW | 24 hr |
| Jan 30, 12:15 PM MST | High Wind Warning | RIW | 49 hr |
| Jan 30, 12:48 PM MST | Winter Storm Warning | RIW | 4 days |
| Jan 31, 12:34 PM MST | Winter Weather Advisory | RIW | 52 hr |
| Feb 1, 12:55 PM MST | High Wind Watch | RIW | 20 hr |
| Feb 1, 12:55 PM MST | Winter Weather Advisory | RIW | 52 hr |
| Feb 2, 1:20 AM MST | High Wind Warning | RIW | 25 hr |
| Feb 4, 2:25 AM MST | High Wind Watch | RIW | 10 hr |
| Feb 4, 12:52 PM MST | High Wind Warning | RIW | 31 hr |
| Feb 6, 1:52 AM MST | Winter Storm Warning | RIW | 43 hr |
| Feb 6, 1:52 AM MST | Winter Weather Advisory | RIW | 43 hr |
| Feb 11, 1:35 AM MST | Cold Weather Advisory | RIW | 56 hr |
| Feb 12, 1:42 AM MST | Winter Storm Watch | RIW | 11 hr |
| Feb 12, 12:29 PM MST | Winter Storm Warning | RIW | 71 hr |
| Feb 12, 12:29 PM MST | Winter Weather Advisory | RIW | 71 hr |
| Feb 12, 12:46 PM MST | High Wind Watch | RIW | 12 hr |
| Feb 13, 1:09 AM MST | High Wind Warning | RIW | 28 hr |
| Feb 15, 1:19 AM MST | Winter Storm Watch | RIW | 13 hr |
| Feb 15, 2:26 PM MST | Winter Storm Warning | RIW | 3 days |
| Feb 15, 2:26 PM MST | Winter Weather Advisory | RIW | 3 days |
| Feb 22, 1:25 AM MST | High Wind Watch | RIW | 10 hr |
| Feb 22, 11:38 AM MST | High Wind Warning | RIW | 53 hr |
| Feb 22, 11:47 AM MST | Winter Weather Advisory | RIW | 43 hr |
| Feb 23, 11:28 AM MST | Winter Storm Warning | RIW | 20 hr |
| Feb 24, 11:33 AM MST | High Wind Warning | RIW | 30 hr |
| Feb 25, 9:46 AM MST | Snow Squall Warning | RIW | 29 min |
| Mar 4, 12:58 AM MST | Winter Storm Watch | RIW | 24 hr |
| Mar 5, 1:19 AM MST | Winter Storm Warning | RIW | 52 hr |
| Mar 5, 1:19 AM MST | Winter Weather Advisory | RIW | 52 hr |
| Mar 12, 1:19 AM MDT | Winter Weather Advisory | RIW | 62 hr |
| Mar 14, 2:20 PM MDT | High Wind Watch | RIW | 23 hr |
| Mar 15, 1:17 PM MDT | High Wind Warning | RIW | 47 hr |
| Mar 15, 11:11 PM MDT | Winter Weather Advisory | RIW | 19 hr |
| Mar 17, 2:54 AM MDT | Winter Storm Warning | RIW | 44 hr |
| Mar 17, 2:54 AM MDT | Winter Weather Advisory | RIW | 51 hr |
| Mar 20, 1:09 PM MDT | Winter Weather Advisory | RIW | 53 hr |
| Mar 21, 2:52 AM MDT | High Wind Watch | RIW | 10 hr |
| Mar 21, 12:52 PM MDT | High Wind Warning | RIW | 32 hr |
| Mar 28, 1:16 PM MDT | Winter Weather Advisory | RIW | 53 hr |
| Mar 31, 12:52 AM MDT | Winter Weather Advisory | RIW | 65 hr |
| Mar 31, 1:49 PM MDT | Special Weather Statement | RIW | 56 min |
| Apr 15, 1:43 AM MDT | Winter Storm Watch | RIW | 25 hr |
| Apr 16, 2:31 AM MDT | Winter Storm Warning | RIW | 57 hr |
| Apr 16, 2:31 AM MDT | Winter Weather Advisory | RIW | 57 hr |
| Apr 27, 1:23 AM MDT | Winter Weather Advisory | RIW | 41 hr |
| Apr 29, 8:23 AM MDT | Dense Fog Advisory | RIW | 109 min |
| May 4, 5:06 PM MDT | Special Weather Statement | RIW | 24 min |
| May 5, 1:58 AM MDT | Winter Weather Advisory | RIW | 34 hr |
| May 11, 1:34 PM MDT | Severe Thunderstorm Warning | RIW | 26 min |
| May 11, 2:21 PM MDT | Special Weather Statement | RIW | 24 min |
| May 11, 5:20 PM MDT | Special Weather Statement | RIW | 40 min |
| May 11, 5:58 PM MDT | Special Weather Statement | RIW | 47 min |
| May 11, 6:41 PM MDT | Special Weather Statement | RIW | 49 min |
| May 12, 2:26 AM MDT | Winter Storm Watch | RIW | 23 hr |
| May 13, 1:30 AM MDT | Winter Weather Advisory | RIW | 41 hr |
| May 14, 1:26 PM MDT | Special Weather Statement | RIW | 34 min |
| May 18, 1:30 AM MDT | Winter Weather Advisory | RIW | 47 hr |
| May 20, 3:26 PM MDT | Special Weather Statement | RIW | 34 min |
| May 24, 1:58 PM MDT | Special Weather Statement | RIW | 32 min |
| May 24, 3:27 PM MDT | Special Weather Statement | RIW | 33 min |
| May 24, 3:59 PM MDT | Special Weather Statement | RIW | 31 min |
| May 26, 7:08 PM MDT | Special Weather Statement | RIW | 37 min |
| May 27, 1:46 PM MDT | Special Weather Statement | RIW | 29 min |
| Jun 1, 3:32 PM MDT | Special Weather Statement | RIW | 28 min |
| Jun 1, 3:48 PM MDT | Special Weather Statement | RIW | 27 min |
| Jun 1, 4:38 PM MDT | Special Weather Statement | RIW | 37 min |
| Jun 6, 1:46 PM MDT | Special Weather Statement | RIW | 29 min |
| Jun 11, 1:57 PM MDT | Mesoscale Discussion | SPC | 63 min |
| Jun 11, 2:15 PM MDT | Special Weather Statement | RIW | 30 min |
| Jun 11, 3:00 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 11, 4:38 PM MDT | Special Weather Statement | RIW | 37 min |
| Jun 11, 4:59 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jun 11, 5:10 PM MDT | Special Weather Statement | RIW | 35 min |
| Jun 11, 5:27 PM MDT | Severe Thunderstorm Warning | RIW | 33 min |
| Jun 11, 6:00 PM MDT | Special Weather Statement | RIW | 30 min |
| Jun 11, 6:31 PM MDT | Special Weather Statement | RIW | 29 min |
| Jun 11, 6:50 PM MDT | Severe Thunderstorm Warning | RIW | 25 min |
| Jun 11, 7:16 PM MDT | Special Weather Statement | RIW | 29 min |
| Jun 13, 3:28 PM MDT | Special Weather Statement | RIW | 32 min |
| Jun 13, 3:35 PM MDT | Severe Thunderstorm Warning | RIW | 40 min |
| Jun 14, 4:17 PM MDT | Special Weather Statement | RIW | 28 min |
| Jun 16, 4:22 PM MDT | Special Weather Statement | RIW | 23 min |
| Jun 17, 1:24 PM MDT | Special Weather Statement | RIW | 36 min |
| Jun 17, 1:33 PM MDT | Severe Thunderstorm Warning | RIW | 27 min |
| Jun 17, 1:56 PM MDT | Special Weather Statement | RIW | 34 min |
| Jun 17, 2:09 PM MDT | Special Weather Statement | RIW | 36 min |
| Jun 21, 12:51 PM MDT | Freeze Warning | RIW | 43 hr |
| Jul 1, 2:04 PM MDT | Special Weather Statement | RIW | 26 min |
| Jul 4, 12:20 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 4, 3:18 PM MDT | Special Weather Statement | RIW | 57 min |
| Jul 4, 3:29 PM MDT | Severe Thunderstorm Warning | RIW | 31 min |
| Jul 4, 3:58 PM MDT | Severe Thunderstorm Warning | RIW | 47 min |
| Jul 4, 4:32 PM MDT | Severe Thunderstorm Warning | RIW | 28 min |
| Jul 4, 9:14 PM MDT | Special Weather Statement | RIW | 16 min |
| Jul 4, 9:42 PM MDT | Special Weather Statement | RIW | 33 min |
| Jul 4, 9:47 PM MDT | Special Weather Statement | RIW | 28 min |
| Jul 4, 10:21 PM MDT | Special Weather Statement | RIW | 39 min |
| Jul 8, 6:34 PM MDT | Special Weather Statement | RIW | 41 min |
| Jul 15, 2:12 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 3:34 PM MDT | Severe Thunderstorm Warning | RIW | 26 min |
| Jul 15, 3:57 PM MDT | Severe Thunderstorm Warning | RIW | 48 min |
| Jul 15, 4:32 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 15, 4:35 PM MDT | Severe Thunderstorm Warning | RIW | 40 min |
| Jul 15, 4:42 PM MDT | Severe Thunderstorm Warning | RIW | 48 min |
| Jul 15, 5:24 PM MDT | Severe Thunderstorm Warning | RIW | 51 min |
| Jul 15, 5:51 PM MDT | Severe Thunderstorm Warning | RIW | 39 min |
| Jul 15, 6:03 PM MDT | Special Weather Statement | RIW | 27 min |
| Jul 15, 6:08 PM MDT | Severe Thunderstorm Warning | RIW | 37 min |
| Jul 15, 6:16 PM MDT | Severe Thunderstorm Warning | RIW | 29 min |
| Jul 15, 6:35 PM MDT | Severe Thunderstorm Warning | RIW | 40 min |
| Jul 15, 6:46 PM MDT | Severe Thunderstorm Warning | RIW | 44 min |
| Jul 15, 6:57 PM MDT | Severe Thunderstorm Warning | RIW | 48 min |
| Jul 15, 7:13 PM MDT | Special Weather Statement | RIW | 32 min |
| Jul 15, 7:27 PM MDT | Severe Thunderstorm Warning | RIW | 13 min |
| Jul 17, 1:27 AM MDT | Red Flag Warning | RIW | 19 hr |
| Jul 18, 3:25 PM MDT | Special Weather Statement | RIW | 35 min |
| Jul 18, 5:24 PM MDT | Special Weather Statement | RIW | 36 min |
| Jul 19, 12:03 PM MDT | Fire Weather Watch | RIW | 14 hr |
| Jul 20, 1:50 AM MDT | Red Flag Warning | RIW | 66 hr |
| Jul 25, 1:54 AM MDT | Fire Weather Watch | RIW | 24 hr |
| Jul 26, 1:34 AM MDT | Red Flag Warning | RIW | 18 hr |
| Jul 27, 12:52 AM MDT | Red Flag Warning | RIW | 19 hr |
| Jul 29, 2:28 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 29, 5:24 PM MDT | Severe Thunderstorm Warning | RIW | 51 min |
| Jul 29, 6:12 PM MDT | Severe Thunderstorm Warning | RIW | 48 min |
| Jul 30, 2:31 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jul 30, 5:04 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 30, 6:28 PM MDT | Special Weather Statement | RIW | 47 min |
| Jul 30, 6:30 PM MDT | Severe Thunderstorm Warning | RIW | 45 min |
| Jul 30, 6:35 PM MDT | Special Weather Statement | RIW | 25 min |
| Jul 30, 7:02 PM MDT | Severe Thunderstorm Warning | RIW | 43 min |
| Jul 30, 7:13 PM MDT | Special Weather Statement | RIW | 47 min |
| Jul 30, 7:50 PM MDT | Severe Thunderstorm Warning | RIW | 29 min |
| Jul 30, 8:06 PM MDT | Special Weather Statement | RIW | 24 min |
| Jul 30, 8:28 PM MDT | Areal Flood Advisory | RIW | 3 hr |
| Jul 31, 6:25 PM MDT | Special Weather Statement | RIW | 35 min |
| Jul 31, 6:59 PM MDT | Special Weather Statement | RIW | 31 min |
| Jul 31, 7:44 PM MDT | Areal Flood Advisory | RIW | 3 hr |
| Jul 31, 7:54 PM MDT | Special Weather Statement | RIW | 36 min |
| Aug 3, 2:19 AM MDT | Red Flag Warning | RIW | 6 days |
| Aug 4, 1:59 PM MDT | Fire Weather Watch | RIW | 12 hr |
| Aug 6, 1:06 AM MDT | Fire Weather Watch | RIW | 24 hr |
| Aug 8, 12:33 PM MDT | Freeze Warning | RIW | 19 hr |
| Aug 12, 1:18 AM MDT | Fire Weather Watch | RIW | 12 hr |
| Aug 12, 1:14 PM MDT | Red Flag Warning | RIW | 55 hr |
| Aug 13, 3:58 PM MDT | Special Weather Statement | RIW | 32 min |
| Aug 13, 4:29 PM MDT | Special Weather Statement | RIW | 31 min |
| Aug 14, 4:31 PM MDT | Special Weather Statement | RIW | 44 min |
| Aug 27, 5:49 PM MDT | Areal Flood Advisory | RIW | 116 min |
| Sep 7, 6:55 PM MDT | Special Weather Statement | RIW | 35 min |
| Sep 10, 10:08 PM MDT | Special Weather Statement | RIW | 37 min |
| Sep 10, 10:14 PM MDT | Severe Thunderstorm Warning | RIW | 31 min |
| Sep 10, 11:49 PM MDT | Special Weather Statement | RIW | 26 min |
| Sep 11, 3:19 AM MDT | Special Weather Statement | RIW | 26 min |
| Sep 11, 3:31 PM MDT | Special Weather Statement | RIW | 29 min |
| Sep 11, 3:41 PM MDT | Severe Thunderstorm Warning | RIW | 34 min |
| Sep 15, 10:45 AM MDT | Freeze Warning | RIW | 20 hr |
| Sep 15, 1:04 PM MDT | Special Weather Statement | RIW | 26 min |
| Sep 15, 3:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Sep 21, 3:28 PM MDT | Special Weather Statement | RIW | 32 min |
| Sep 21, 3:33 PM MDT | Special Weather Statement | RIW | 27 min |
| Sep 21, 4:08 PM MDT | Special Weather Statement | RIW | 37 min |
| Oct 2, 1:44 PM MDT | Winter Storm Watch | RIW | 23 hr |
| Oct 3, 1:02 PM MDT | Winter Weather Advisory | RIW | 58 hr |
| Oct 4, 12:38 PM MDT | Freeze Watch | RIW | 21 hr |
| Oct 4, 12:38 PM MDT | Freeze Warning | RIW | 21 hr |
| Oct 4, 7:03 PM MDT | Areal Flood Advisory | RIW | 4 hr |
| Oct 5, 2:14 AM MDT | Freeze Warning | RIW | 32 hr |
| Oct 5, 9:58 AM MDT | Freeze Watch | RIW | 27 hr |
| Oct 6, 1:26 PM MDT | Freeze Warning | RIW | 20 hr |
| Oct 14, 1:06 PM MDT | Winter Weather Advisory | RIW | 55 hr |
| Oct 18, 12:58 PM MDT | High Wind Watch | RIW | 12 hr |
| Oct 18, 1:03 PM MDT | Winter Weather Advisory | RIW | 34 hr |
| Oct 19, 1:00 AM MDT | High Wind Warning | RIW | 23 hr |
| Oct 24, 1:42 PM MDT | Winter Storm Watch | RIW | 11 hr |
| Oct 25, 1:07 AM MDT | Winter Storm Warning | RIW | 65 hr |
| Oct 25, 1:19 PM MDT | Winter Weather Advisory | RIW | 53 hr |
| Nov 5, 11:56 AM MST | Winter Weather Advisory | RIW | 25 hr |
| Nov 15, 11:51 PM MST | Winter Weather Advisory | RIW | 37 hr |
| Dec 1, 12:21 AM MST | Winter Weather Advisory | RIW | 44 hr |
| Dec 3, 12:48 PM MST | Winter Storm Watch | RIW | 14 hr |
| Dec 4, 2:22 AM MST | Winter Storm Warning | RIW | 63 hr |
| Dec 4, 2:37 AM MST | Winter Weather Advisory | RIW | 59 hr |
| Dec 7, 2:46 AM MST | Winter Weather Advisory | RIW | 26 hr |
| Dec 7, 2:30 PM MST | High Wind Watch | RIW | 11 hr |
| Dec 8, 1:49 AM MST | High Wind Warning | RIW | 4 days |
| Dec 8, 2:02 AM MST | Winter Storm Watch | RIW | 11 hr |
| Dec 8, 2:02 AM MST | Winter Storm Warning | RIW | 58 hr |
| Dec 8, 1:21 PM MST | Winter Weather Advisory | RIW | 52 hr |
| Dec 11, 12:56 PM MST | Winter Weather Advisory | RIW | 18 hr |
| Dec 15, 12:58 PM MST | Winter Storm Watch | RIW | 23 hr |
| Dec 15, 1:19 PM MST | High Wind Watch | RIW | 22 hr |
| Dec 15, 1:19 PM MST | High Wind Warning | RIW | 64 hr |
| Dec 16, 11:31 AM MST | Winter Storm Warning | RIW | 35 hr |
| Dec 18, 1:24 AM MST | Winter Storm Warning | RIW | 52 hr |
| Dec 18, 11:29 AM MST | High Wind Warning | RIW | 36 hr |
| Dec 20, 12:17 PM MST | Winter Storm Warning | RIW | 53 hr |
| Dec 22, 10:18 AM MST | High Wind Warning | RIW | 4 hr |
| Dec 23, 11:31 AM MST | High Wind Watch | RIW | 14 hr |
| Dec 24, 1:10 AM MST | High Wind Warning | RIW | 34 hr |
| Dec 24, 1:15 AM MST | Winter Weather Advisory | RIW | 35 hr |
| Dec 25, 12:21 PM MST | Winter Weather Advisory | RIW | 53 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 | 27 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 7 |
| Special Weather Statement | 59 |
| Flooding | |
| Areal Flood Advisory | 4 |
| Winter | |
| Snow Squall Warning | 1 |
| Winter Storm Warning | 16 |
| Winter Storm Watch | 11 |
| Winter Weather Advisory | 34 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 2 |
| Cold Weather Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 15 |
| High Wind Watch | 11 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
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.