Alert archive / Wyoming / Teton County
Weather alerts in Teton County, Wyoming, 2020
86 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Teton County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 86
- Warnings
- 22
- Watches
- 14
- Advisories
- 21
- Busiest month
- August15 alerts
- Busiest day
- June 7, 20204 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Teton 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 7, 1:46 AM MST | Winter Weather Advisory | RIW | 64 hr |
| Jan 10, 12:40 PM MST | Winter Weather Advisory | RIW | 41 hr |
| Jan 12, 9:58 AM MST | Winter Storm Warning | RIW | 19 hr |
| Jan 12, 9:58 AM MST | Winter Weather Advisory | RIW | 19 hr |
| Jan 13, 5:45 AM MST | Winter Weather Advisory | RIW | 35 hr |
| Jan 14, 9:34 PM MST | Special Weather Statement | RIW | 101 min |
| Jan 16, 4:12 AM MST | Winter Weather Advisory | RIW | 37 hr |
| Feb 1, 1:50 PM MST | Winter Weather Advisory | RIW | 55 hr |
| Feb 4, 6:26 AM MST | Winter Storm Watch | RIW | 33 hr |
| Feb 5, 3:41 AM MST | Winter Storm Warning | RIW | 55 hr |
| Feb 7, 1:30 PM MST | Winter Weather Advisory | RIW | 28 hr |
| Feb 14, 11:41 AM MST | Winter Storm Watch | RIW | 16 hr |
| Feb 15, 3:43 AM MST | Winter Storm Warning | RIW | 43 hr |
| Feb 15, 3:43 AM MST | Winter Weather Advisory | RIW | 43 hr |
| Mar 6, 9:42 AM MST | Flood Watch | RIW | 32 hr |
| Mar 13, 2:57 AM MDT | Winter Storm Watch | RIW | 11 hr |
| Mar 13, 1:52 PM MDT | Winter Storm Warning | RIW | 52 hr |
| Mar 13, 1:52 PM MDT | Winter Weather Advisory | RIW | 52 hr |
| Mar 30, 1:45 AM MDT | Winter Storm Warning | RIW | 45 hr |
| Mar 30, 1:45 AM MDT | Winter Weather Advisory | RIW | 45 hr |
| Apr 11, 2:31 AM MDT | Winter Weather Advisory | RIW | 35 hr |
| Apr 14, 12:47 PM MDT | Winter Weather Advisory | RIW | 47 hr |
| May 22, 3:08 PM MDT | Special Weather Statement | RIW | 37 min |
| May 29, 12:37 PM MDT | Special Weather Statement | RIW | 23 min |
| May 29, 2:12 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 29, 2:37 PM MDT | Special Weather Statement | RIW | 23 min |
| May 30, 1:11 PM MDT | Special Weather Statement | RIW | 64 min |
| May 30, 1:45 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jun 3, 3:59 PM MDT | Special Weather Statement | RIW | 91 min |
| Jun 3, 5:35 PM MDT | Special Weather Statement | RIW | 55 min |
| Jun 6, 6:22 PM MDT | Special Weather Statement | RIW | 23 min |
| Jun 7, 2:22 AM MDT | Winter Weather Advisory | RIW | 30 hr |
| Jun 7, 2:30 AM MDT | Freeze Watch | RIW | 9 hr |
| Jun 7, 11:15 AM MDT | Freeze Warning | RIW | 22 hr |
| Jun 8, 11:38 AM MDT | Freeze Warning | RIW | 21 hr |
| Jun 21, 3:53 PM MDT | Special Weather Statement | RIW | 52 min |
| Jun 24, 4:58 PM MDT | Special Weather Statement | RIW | 32 min |
| Jul 1, 4:05 PM MDT | Special Weather Statement | RIW | 40 min |
| Jul 1, 5:20 PM MDT | Special Weather Statement | RIW | 40 min |
| Jul 1, 6:20 PM MDT | Special Weather Statement | RIW | 40 min |
| Jul 23, 6:18 PM MDT | Special Weather Statement | RIW | 57 min |
| Jul 25, 4:16 PM MDT | Special Weather Statement | RIW | 74 min |
| Jul 25, 5:01 PM MDT | Special Weather Statement | RIW | 44 min |
| Jul 29, 4:32 PM MDT | Special Weather Statement | RIW | 58 min |
| Jul 29, 5:41 PM MDT | Special Weather Statement | RIW | 49 min |
| Aug 3, 6:51 PM MDT | Special Weather Statement | RIW | 24 min |
| Aug 10, 12:12 PM MDT | Red Flag Warning | RIW | 32 hr |
| Aug 11, 12:12 PM MDT | Red Flag Warning | RIW | 3 days |
| Aug 18, 3:43 AM MDT | Red Flag Warning | RIW | 17 hr |
| Aug 20, 3:31 AM MDT | Fire Weather Watch | RIW | 22 hr |
| Aug 24, 5:20 PM MDT | Special Weather Statement | RIW | 40 min |
| Aug 25, 7:00 PM MDT | Special Weather Statement | RIW | 60 min |
| Aug 25, 7:42 PM MDT | Special Weather Statement | RIW | 63 min |
| Aug 26, 2:44 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Aug 26, 11:02 PM MDT | Special Weather Statement | RIW | 43 min |
| Aug 26, 11:48 PM MDT | Special Weather Statement | RIW | 42 min |
| Aug 28, 1:59 AM MDT | Fire Weather Watch | RIW | 13 hr |
| Aug 28, 3:11 PM MDT | Red Flag Warning | RIW | 54 hr |
| Aug 31, 4:10 AM MDT | Freeze Watch | RIW | 99 min |
| Aug 31, 5:49 AM MDT | Freeze Warning | RIW | 27 hr |
| Sep 3, 2:37 PM MDT | Fire Weather Watch | RIW | 44 hr |
| Sep 4, 12:31 PM MDT | Red Flag Warning | RIW | 3 days |
| Sep 7, 11:25 AM MDT | High Wind Warning | RIW | 17 hr |
| Sep 12, 1:44 PM MDT | Fire Weather Watch | RIW | 24 hr |
| Sep 13, 1:18 PM MDT | Red Flag Warning | RIW | 32 hr |
| Sep 16, 1:46 PM MDT | Fire Weather Watch | RIW | 22 hr |
| Sep 19, 6:19 PM MDT | Special Weather Statement | RIW | 26 min |
| Sep 19, 6:43 PM MDT | Special Weather Statement | RIW | 32 min |
| Sep 23, 2:43 AM MDT | Fire Weather Watch | RIW | 12 hr |
| Sep 23, 2:21 PM MDT | Red Flag Warning | RIW | 53 hr |
| Oct 7, 2:05 PM MDT | Red Flag Warning | RIW | 30 hr |
| Oct 9, 1:40 PM MDT | Red Flag Warning | RIW | 30 hr |
| Oct 10, 2:12 PM MDT | Winter Weather Advisory | RIW | 22 hr |
| Oct 22, 7:17 PM MDT | Winter Storm Watch | RIW | 9 hr |
| Oct 23, 4:23 AM MDT | Winter Storm Warning | RIW | 50 hr |
| Oct 23, 4:23 AM MDT | Winter Weather Advisory | RIW | 58 hr |
| Nov 7, 3:32 AM MST | Winter Weather Advisory | RIW | 37 hr |
| Nov 9, 2:15 PM MST | Winter Weather Advisory | RIW | 56 hr |
| Nov 11, 1:06 AM MST | Winter Storm Warning | RIW | 21 hr |
| Nov 12, 4:38 AM MST | Winter Storm Watch | RIW | 10 hr |
| Nov 12, 2:41 PM MST | Winter Storm Warning | RIW | 48 hr |
| Nov 14, 2:42 PM MST | Winter Weather Advisory | RIW | 39 hr |
| Dec 16, 2:21 PM MST | Winter Weather Advisory | RIW | 36 hr |
| Dec 19, 1:10 PM MST | Winter Weather Advisory | RIW | 47 hr |
| Dec 25, 12:42 PM MST | Winter Storm Warning | RIW | 41 hr |
| Dec 25, 12:42 PM MST | Winter Weather Advisory | RIW | 41 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 | |
| Mesoscale Discussion | 3 |
| Special Weather Statement | 26 |
| Flooding | |
| Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 9 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 21 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| Fire | |
| Red Flag Warning | 9 |
| Fire Weather Watch | 6 |
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.