Alert archive / Wyoming / Natrona County
Weather alerts in Natrona County, Wyoming, 2019
207 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Natrona County and its neighbors
Each county as a circle sized by its count in 2019. Tap one for its archive.
- Alerts
- 207
- Warnings
- 62
- Watches
- 25
- Advisories
- 27
- Busiest month
- July58 alerts
- Busiest day
- July 4, 201916 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 5 tornado warnings covering Natrona County in 2019 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Natrona County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 25 | 2 | 92% | 5 | 40% | 8 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Riverton, WY: tornado warnings | 14 | 0 | 100% | 2 | 0% | |
| NWS Riverton, WY: severe thunderstorm warnings | 102 | 18 | 82% | 41 | 59% | 17 min |
| NWS Riverton, WY: flash flood warnings | 1 | 0 | 100% | 1 | 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 5, 2:04 PM MST | High Wind Watch | RIW | 34 hr |
| Jan 6, 5:18 AM MST | High Wind Warning | RIW | 37 hr |
| Jan 11, 5:45 PM MST | Dense Fog Advisory | RIW | 18 hr |
| Jan 19, 4:51 PM MST | Winter Storm Watch | RIW | 23 hr |
| Jan 20, 3:36 PM MST | Winter Storm Warning | RIW | 37 hr |
| Jan 20, 3:36 PM MST | Winter Weather Advisory | RIW | 37 hr |
| Jan 26, 2:38 AM MST | Winter Storm Watch | RIW | 19 hr |
| Jan 26, 9:52 PM MST | Winter Weather Advisory | RIW | 40 hr |
| Feb 1, 2:48 AM MST | High Wind Watch | RIW | 19 hr |
| Feb 1, 10:05 PM MST | High Wind Warning | RIW | 22 hr |
| Feb 3, 1:15 PM MST | Winter Weather Advisory | RIW | 3 days |
| Feb 9, 7:06 PM MST | Wind Chill Advisory | RIW | 10 hr |
| Feb 12, 1:25 AM MST | High Wind Watch | RIW | 9 hr |
| Feb 12, 1:25 AM MST | High Wind Warning | RIW | 49 hr |
| Feb 16, 1:12 PM MST | Special Weather Statement | RIW | 33 min |
| Feb 16, 1:24 PM MST | Snow Squall Warning | RIW | 36 min |
| Feb 16, 1:55 PM MST | Snow Squall Warning | RIW | 35 min |
| Feb 16, 2:28 PM MST | Snow Squall Warning | RIW | 32 min |
| Feb 16, 3:02 PM MST | Snow Squall Warning | RIW | 28 min |
| Mar 1, 3:50 AM MST | Wind Chill Advisory | RIW | 31 hr |
| Mar 2, 5:24 PM MST | Wind Chill Advisory | RIW | 16 hr |
| Mar 7, 3:13 PM MST | Winter Storm Watch | RIW | 10 hr |
| Mar 8, 1:42 AM MST | Winter Weather Advisory | RIW | 33 hr |
| Mar 11, 4:04 PM MDT | Winter Storm Watch | RIW | 18 hr |
| Mar 12, 9:53 AM MDT | Winter Storm Warning | RIW | 43 hr |
| Mar 12, 9:53 AM MDT | Winter Weather Advisory | RIW | 37 hr |
| Mar 13, 6:20 AM MDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 14, 4:24 AM MDT | Winter Weather Advisory | RIW | 7 hr |
| Mar 27, 3:04 PM MDT | Winter Storm Watch | RIW | 23 hr |
| Mar 28, 1:58 PM MDT | Winter Storm Warning | RIW | 31 hr |
| Mar 28, 1:58 PM MDT | Winter Weather Advisory | RIW | 31 hr |
| Apr 7, 9:18 PM MDT | Winter Storm Watch | RIW | 38 hr |
| Apr 8, 2:13 PM MDT | Winter Weather Advisory | RIW | 58 hr |
| Apr 9, 11:18 AM MDT | Winter Storm Warning | RIW | 37 hr |
| Apr 26, 12:55 PM MDT | Special Weather Statement | RIW | 50 min |
| Apr 26, 1:02 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 26, 2:51 PM MDT | Special Weather Statement | RIW | 39 min |
| Apr 26, 3:51 PM MDT | Special Weather Statement | RIW | 24 min |
| Apr 29, 2:48 AM MDT | Winter Weather Advisory | RIW | 57 hr |
| May 7, 2:12 PM MDT | Winter Weather Advisory | RIW | 40 hr |
| May 7, 3:55 PM MDT | Tornado Warning | RIW | 20 min |
| May 7, 4:02 PM MDT | Special Weather Statement | RIW | 28 min |
| May 7, 4:23 PM MDT | Special Weather Statement | RIW | 37 min |
| May 7, 4:57 PM MDT | Special Weather Statement | RIW | 33 min |
| May 7, 5:25 PM MDT | Special Weather Statement | RIW | 35 min |
| May 14, 4:13 PM MDT | Special Weather Statement | RIW | 92 min |
| May 14, 5:39 PM MDT | Special Weather Statement | RIW | 36 min |
| May 16, 3:39 PM MDT | Severe Thunderstorm Warning | RIW | 51 min |
| May 16, 4:28 PM MDT | Severe Thunderstorm Warning | RIW | 47 min |
| May 20, 2:28 PM MDT | Winter Weather Advisory | RIW | 43 hr |
| May 25, 1:55 PM MDT | Flood Watch | RIW | 72 hr |
| May 27, 3:57 AM MDT | Winter Storm Warning | RIW | 33 hr |
| Jun 2, 3:25 PM MDT | Special Weather Statement | RIW | 50 min |
| Jun 7, 1:41 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 2:18 PM MDT | Special Weather Statement | RIW | 27 min |
| Jun 13, 3:27 PM MDT | Special Weather Statement | RIW | 48 min |
| Jun 14, 2:58 PM MDT | Special Weather Statement | RIW | 17 min |
| Jun 15, 3:02 PM MDT | Special Weather Statement | RIW | 28 min |
| Jun 15, 3:33 PM MDT | Special Weather Statement | RIW | 42 min |
| Jun 15, 5:02 PM MDT | Special Weather Statement | RIW | 28 min |
| Jun 15, 5:07 PM MDT | Special Weather Statement | RIW | 23 min |
| Jun 15, 5:24 PM MDT | Special Weather Statement | RIW | 51 min |
| Jun 15, 5:33 PM MDT | Special Weather Statement | RIW | 27 min |
| Jun 17, 3:00 PM MDT | Special Weather Statement | RIW | 30 min |
| Jun 19, 4:00 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 3:45 PM MDT | Special Weather Statement | RIW | 45 min |
| Jul 1, 1:28 PM MDT | Severe Thunderstorm Warning | RIW | 47 min |
| Jul 1, 2:44 PM MDT | Severe Thunderstorm Warning | RIW | 46 min |
| Jul 1, 3:50 PM MDT | Severe Thunderstorm Warning | RIW | 40 min |
| Jul 1, 5:41 PM MDT | Special Weather Statement | RIW | 49 min |
| Jul 1, 6:31 PM MDT | Special Weather Statement | RIW | 29 min |
| Jul 1, 6:54 PM MDT | Special Weather Statement | RIW | 36 min |
| Jul 1, 7:06 PM MDT | Severe Thunderstorm Warning | RIW | 39 min |
| Jul 2, 12:44 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 2, 4:39 PM MDT | Special Weather Statement | RIW | 36 min |
| Jul 2, 5:01 PM MDT | Special Weather Statement | RIW | 29 min |
| Jul 2, 5:17 PM MDT | Special Weather Statement | RIW | 28 min |
| Jul 3, 12:43 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 2:51 PM MDT | Special Weather Statement | RIW | 39 min |
| Jul 3, 3:55 PM MDT | Special Weather Statement | RIW | 35 min |
| Jul 3, 7:34 PM MDT | Special Weather Statement | RIW | 26 min |
| Jul 3, 8:17 PM MDT | Severe Thunderstorm Warning | RIW | 43 min |
| Jul 3, 9:22 PM MDT | Severe Thunderstorm Warning | RIW | 38 min |
| Jul 3, 11:58 PM MDT | Special Weather Statement | RIW | 47 min |
| Jul 4, 3:37 AM MDT | Severe Thunderstorm Warning | RIW | 38 min |
| Jul 4, 4:14 AM MDT | Severe Thunderstorm Warning | RIW | 61 min |
| Jul 4, 5:05 AM MDT | Severe Thunderstorm Warning | RIW | 55 min |
| Jul 4, 5:53 AM MDT | Severe Thunderstorm Warning | RIW | 37 min |
| Jul 4, 1:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 4, 2:31 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 4, 3:51 PM MDT | Special Weather Statement | RIW | 24 min |
| Jul 4, 4:03 PM MDT | Severe Thunderstorm Warning | RIW | 42 min |
| Jul 4, 4:45 PM MDT | Special Weather Statement | RIW | 30 min |
| Jul 4, 5:05 PM MDT | Severe Thunderstorm Warning | RIW | 40 min |
| Jul 4, 5:35 PM MDT | Tornado Warning | RIW | 25 min |
| Jul 4, 5:59 PM MDT | Special Weather Statement | RIW | 31 min |
| Jul 4, 6:00 PM MDT | Areal Flood Advisory | RIW | 3 hr |
| Jul 4, 7:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jul 6, 1:18 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 4:25 PM MDT | Special Weather Statement | RIW | 35 min |
| Jul 6, 4:43 PM MDT | Special Weather Statement | RIW | 32 min |
| Jul 6, 4:51 PM MDT | Special Weather Statement | RIW | 24 min |
| Jul 6, 4:57 PM MDT | Severe Thunderstorm Warning | RIW | 36 min |
| Jul 6, 5:13 PM MDT | Special Weather Statement | RIW | 32 min |
| Jul 8, 4:02 PM MDT | Special Weather Statement | RIW | 28 min |
| Jul 8, 4:33 PM MDT | Special Weather Statement | RIW | 27 min |
| Jul 9, 12:10 PM MDT | Special Weather Statement | RIW | 35 min |
| Jul 14, 10:34 PM MDT | Special Weather Statement | RIW | 41 min |
| Jul 15, 2:52 PM MDT | Special Weather Statement | RIW | 38 min |
| Jul 15, 2:54 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 15, 3:33 PM MDT | Special Weather Statement | RIW | 27 min |
| Jul 15, 3:35 PM MDT | Severe Thunderstorm Warning | RIW | 40 min |
| Jul 17, 3:54 AM MDT | Fire Weather Watch | RIW | 23 hr |
| Jul 18, 2:38 AM MDT | Red Flag Warning | RIW | 17 hr |
| Jul 20, 4:38 PM MDT | Special Weather Statement | RIW | 52 min |
| Jul 20, 6:37 PM MDT | Special Weather Statement | RIW | 38 min |
| Jul 22, 4:48 PM MDT | Special Weather Statement | RIW | 27 min |
| Jul 22, 5:18 PM MDT | Special Weather Statement | RIW | 27 min |
| Jul 22, 6:00 PM MDT | Special Weather Statement | RIW | 45 min |
| Jul 22, 6:23 PM MDT | Special Weather Statement | RIW | 37 min |
| Jul 22, 6:52 PM MDT | Special Weather Statement | RIW | 38 min |
| Jul 23, 5:03 PM MDT | Special Weather Statement | RIW | 42 min |
| Jul 27, 5:44 PM MDT | Special Weather Statement | RIW | 31 min |
| Jul 27, 6:13 PM MDT | Special Weather Statement | RIW | 47 min |
| Aug 8, 7:37 PM MDT | Special Weather Statement | RIW | 23 min |
| Aug 9, 4:47 PM MDT | Fire Weather Watch | RIW | 22 hr |
| Aug 10, 2:51 PM MDT | Red Flag Warning | RIW | 52 hr |
| Aug 15, 8:22 PM MDT | Special Weather Statement | RIW | 23 min |
| Aug 15, 8:32 PM MDT | Red Flag Warning | RIW | 4 days |
| Aug 15, 8:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 9:30 PM MDT | Special Weather Statement | RIW | 30 min |
| Aug 15, 9:58 PM MDT | Special Weather Statement | RIW | 17 min |
| Aug 15, 10:03 PM MDT | Severe Thunderstorm Warning | RIW | 12 min |
| Aug 16, 3:58 AM MDT | Fire Weather Watch | RIW | 49 hr |
| Aug 21, 2:42 AM MDT | Fire Weather Watch | RIW | 12 hr |
| Aug 21, 2:52 PM MDT | Red Flag Warning | RIW | 45 hr |
| Aug 21, 4:26 PM MDT | Severe Thunderstorm Warning | RIW | 34 min |
| Aug 21, 4:56 PM MDT | Areal Flood Advisory | RIW | 2 hr |
| Aug 21, 5:03 PM MDT | Special Weather Statement | RIW | 42 min |
| Aug 21, 5:24 PM MDT | Special Weather Statement | RIW | 36 min |
| Aug 21, 5:31 PM MDT | Severe Thunderstorm Warning | RIW | 28 min |
| Aug 21, 5:58 PM MDT | Special Weather Statement | RIW | 47 min |
| Aug 21, 6:05 PM MDT | Severe Thunderstorm Warning | RIW | 25 min |
| Aug 23, 2:08 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 23, 3:19 PM MDT | Fire Weather Watch | RIW | 23 hr |
| Aug 23, 3:25 PM MDT | Severe Thunderstorm Warning | RIW | 50 min |
| Aug 23, 3:50 PM MDT | Severe Thunderstorm Warning | RIW | 25 min |
| Aug 23, 3:58 PM MDT | Special Weather Statement | RIW | 32 min |
| Aug 23, 4:21 PM MDT | Special Weather Statement | RIW | 24 min |
| Aug 23, 4:22 PM MDT | Areal Flood Advisory | RIW | 3 hr |
| Aug 23, 4:23 PM MDT | Special Weather Statement | RIW | 37 min |
| Aug 23, 4:29 PM MDT | Tornado Warning | RIW | 31 min |
| Aug 23, 4:34 PM MDT | Severe Thunderstorm Warning | RIW | 11 min |
| Aug 23, 4:42 PM MDT | Tornado Warning | RIW | 33 min |
| Aug 23, 5:01 PM MDT | Severe Thunderstorm Warning | RIW | 29 min |
| Aug 23, 5:12 PM MDT | Tornado Warning | RIW | 33 min |
| Aug 23, 5:40 PM MDT | Special Weather Statement | RIW | 35 min |
| Aug 23, 6:06 PM MDT | Areal Flood Advisory | RIW | 3 hr |
| Aug 24, 2:10 PM MDT | Red Flag Warning | RIW | 54 hr |
| Aug 25, 7:18 PM MDT | Special Weather Statement | RIW | 27 min |
| Aug 27, 1:33 PM MDT | Red Flag Warning | RIW | 53 hr |
| Aug 30, 2:27 PM MDT | Special Weather Statement | RIW | 48 min |
| Aug 31, 2:27 AM MDT | Fire Weather Watch | RIW | 12 hr |
| Aug 31, 2:48 PM MDT | Red Flag Warning | RIW | 53 hr |
| Sep 3, 3:12 AM MDT | Fire Weather Watch | RIW | 11 hr |
| Sep 3, 2:26 PM MDT | Red Flag Warning | RIW | 29 hr |
| Sep 6, 3:51 PM MDT | Special Weather Statement | RIW | 54 min |
| Sep 6, 4:08 PM MDT | Special Weather Statement | RIW | 37 min |
| Sep 6, 4:16 PM MDT | Severe Thunderstorm Warning | RIW | 44 min |
| Sep 6, 5:00 PM MDT | Special Weather Statement | RIW | 60 min |
| Sep 6, 5:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Sep 8, 3:43 PM MDT | Special Weather Statement | RIW | 47 min |
| Sep 8, 4:27 PM MDT | Special Weather Statement | RIW | 48 min |
| Sep 11, 11:28 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 13, 1:44 PM MDT | Fire Weather Watch | RIW | 14 hr |
| Sep 14, 3:36 AM MDT | Red Flag Warning | RIW | 39 hr |
| Sep 17, 11:36 AM MDT | Special Weather Statement | RIW | 24 min |
| Sep 17, 12:01 PM MDT | Special Weather Statement | RIW | 29 min |
| Sep 18, 2:03 PM MDT | Red Flag Warning | RIW | 29 hr |
| Sep 25, 2:39 AM MDT | Fire Weather Watch | RIW | 25 hr |
| Sep 25, 2:29 PM MDT | Red Flag Warning | RIW | 30 hr |
| Sep 29, 2:11 AM MDT | High Wind Warning | RIW | 15 hr |
| Oct 1, 2:39 PM MDT | Freeze Watch | RIW | 24 hr |
| Oct 2, 1:53 PM MDT | Special Weather Statement | RIW | 22 min |
| Oct 2, 2:27 PM MDT | Freeze Warning | RIW | 20 hr |
| Oct 4, 10:36 PM MDT | Special Weather Statement | RIW | 54 min |
| Oct 6, 3:02 PM MDT | Winter Storm Watch | RIW | 43 hr |
| Oct 8, 10:24 AM MDT | Winter Storm Warning | RIW | 41 hr |
| Oct 18, 2:42 PM MDT | Winter Weather Advisory | RIW | 51 hr |
| Oct 25, 12:44 PM MDT | Winter Weather Advisory | RIW | 49 hr |
| Oct 27, 2:45 PM MDT | Winter Weather Advisory | RIW | 51 hr |
| Oct 29, 5:45 AM MDT | Wind Chill Warning | RIW | 28 hr |
| Nov 6, 5:44 AM MST | Freezing Fog Advisory | RIW | 6 hr |
| Nov 16, 11:18 AM MST | Special Weather Statement | RIW | 57 min |
| Nov 16, 12:21 PM MST | Special Weather Statement | RIW | 54 min |
| Nov 16, 1:10 PM MST | Special Weather Statement | RIW | 65 min |
| Nov 19, 4:54 AM MST | Winter Storm Watch | RIW | 7 hr |
| Nov 19, 4:54 AM MST | Winter Weather Advisory | RIW | 46 hr |
| Nov 19, 12:17 PM MST | Winter Storm Warning | RIW | 39 hr |
| Nov 25, 4:09 AM MST | Winter Storm Warning | RIW | 32 hr |
| Nov 25, 4:09 AM MST | Winter Weather Advisory | RIW | 32 hr |
| Nov 27, 3:53 AM MST | Winter Storm Watch | RIW | 37 hr |
| Nov 28, 4:39 PM MST | Winter Storm Warning | RIW | 49 hr |
| Nov 28, 4:39 PM MST | Winter Weather Advisory | RIW | 43 hr |
| Dec 1, 4:29 AM MST | Winter Weather Advisory | RIW | 35 hr |
| Dec 6, 12:15 PM MST | High Wind Warning | RIW | 30 hr |
| Dec 31, 9:18 AM MST | High Wind Warning | RIW | 9 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 | 25 |
| Tornado Warning | 5 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 80 |
| Flooding | |
| Flood Watch | 1 |
| Areal Flood Advisory | 4 |
| Winter | |
| Snow Squall Warning | 4 |
| Winter Storm Warning | 9 |
| Winter Storm Watch | 9 |
| Winter Weather Advisory | 18 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Warning | 1 |
| Freeze Watch | 1 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 6 |
| High Wind Watch | 3 |
| Fire | |
| Red Flag Warning | 11 |
| Fire Weather Watch | 9 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.