Alert archive / Wyoming / Natrona County
Weather alerts in Natrona County, Wyoming, 2009
151 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 151
- Warnings
- 41
- Watches
- 23
- Advisories
- 34
- Busiest month
- July40 alerts
- Busiest day
- July 27, 20097 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 1 tornado warnings covering Natrona County in 2009 had a tornado report inside them.
Natrona County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 16 | 4 | 75% | 6 | 83% | 8 min |
| Flash flood warnings | 2 | 1 | 50% | 2 | 100% | 34 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Riverton, WY: tornado warnings | 5 | 0 | 100% | 2 | 0% | |
| NWS Riverton, WY: severe thunderstorm warnings | 77 | 23 | 70% | 63 | 56% | 22 min |
| NWS Riverton, WY: flash flood warnings | 6 | 3 | 50% | 6 | 67% | 47 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 1, 3:07 AM MST | High Wind Watch | RIW | 12 hr |
| Jan 1, 11:57 AM MST | Winter Weather Advisory | RIW | 47 hr |
| Jan 1, 3:13 PM MST | High Wind Warning | RIW | 27 hr |
| Jan 2, 4:24 PM MST | Winter Weather Advisory | RIW | 19 hr |
| Jan 4, 1:59 AM MST | High Wind Watch | RIW | 24 hr |
| Jan 4, 3:49 PM MST | High Wind Warning | RIW | 25 hr |
| Jan 6, 1:30 AM MST | High Wind Watch | RIW | 20 hr |
| Jan 6, 1:31 AM MST | Winter Weather Advisory | RIW | 40 hr |
| Jan 6, 9:32 PM MST | High Wind Warning | RIW | 24 hr |
| Jan 7, 9:49 PM MST | High Wind Watch | RIW | 12 hr |
| Jan 8, 9:40 AM MST | High Wind Warning | RIW | 8 hr |
| Jan 11, 1:57 PM MST | Winter Weather Advisory | RIW | 21 hr |
| Jan 23, 2:08 PM MST | Winter Storm Watch | RIW | 13 hr |
| Jan 24, 3:14 AM MST | Winter Weather Advisory | RIW | 23 hr |
| Jan 24, 3:45 PM MST | Winter Storm Watch | RIW | 24 hr |
| Jan 25, 3:42 PM MST | Winter Storm Warning | RIW | 23 hr |
| Jan 27, 1:43 AM MST | Winter Weather Advisory | RIW | 36 hr |
| Feb 12, 1:13 PM MST | Winter Weather Advisory | RIW | 14 hr |
| Feb 17, 2:39 AM MST | Winter Weather Advisory | RIW | 45 hr |
| Feb 20, 1:16 AM MST | Winter Weather Advisory | RIW | 13 hr |
| Mar 7, 3:27 PM MST | Winter Storm Watch | RIW | 23 hr |
| Mar 8, 3:54 PM MDT | Winter Storm Warning | RIW | 35 hr |
| Mar 8, 3:54 PM MDT | Winter Weather Advisory | RIW | 32 hr |
| Mar 9, 8:49 PM MDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 21, 3:07 PM MDT | Winter Storm Watch | RIW | 24 hr |
| Mar 22, 3:12 PM MDT | Blizzard Warning | RIW | 33 hr |
| Mar 22, 3:12 PM MDT | Winter Storm Warning | RIW | 33 hr |
| Mar 23, 3:59 AM MDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 24, 3:30 AM MDT | Winter Storm Watch | RIW | 35 hr |
| Mar 25, 3:29 AM MDT | Winter Storm Warning | RIW | 39 hr |
| Mar 25, 3:29 AM MDT | Winter Weather Advisory | RIW | 39 hr |
| Mar 28, 2:53 AM MDT | Winter Storm Watch | RIW | 34 hr |
| Mar 28, 9:41 PM MDT | Winter Storm Warning | RIW | 41 hr |
| Mar 29, 12:55 PM MDT | Winter Storm Warning | RIW | 21 hr |
| Mar 31, 12:27 AM MDT | Winter Weather Advisory | RIW | 42 hr |
| Apr 2, 12:41 AM MDT | Winter Storm Watch | RIW | 25 hr |
| Apr 2, 12:41 AM MDT | Winter Weather Advisory | RIW | 65 hr |
| Apr 2, 1:08 PM MDT | Winter Storm Warning | RIW | 53 hr |
| Apr 14, 1:02 PM MDT | Winter Storm Watch | RIW | 49 hr |
| Apr 15, 2:03 AM MDT | Winter Storm Warning | RIW | 48 hr |
| Apr 15, 1:33 PM MDT | Winter Weather Advisory | RIW | 43 hr |
| Apr 23, 8:54 PM MDT | Winter Weather Advisory | RIW | 18 hr |
| Apr 25, 3:13 PM MDT | Winter Weather Advisory | RIW | 39 hr |
| May 22, 7:51 AM MDT | Dense Fog Advisory | RIW | 2 hr |
| Jun 6, 2:30 PM MDT | Winter Weather Advisory | RIW | 25 hr |
| Jun 7, 3:40 PM MDT | Freeze Warning | RIW | 17 hr |
| Jun 13, 1:56 PM MDT | Tornado Watch | SPC | 9 hr |
| Jun 13, 3:22 PM MDT | Severe Thunderstorm Warning | RIW | 38 min |
| Jun 13, 3:53 PM MDT | Severe Thunderstorm Warning | RIW | 37 min |
| Jun 13, 4:26 PM MDT | Severe Thunderstorm Warning | RIW | 49 min |
| Jun 13, 5:06 PM MDT | Severe Thunderstorm Warning | RIW | 39 min |
| Jun 13, 5:35 PM MDT | Severe Thunderstorm Warning | RIW | 40 min |
| Jun 13, 6:42 PM MDT | Mesoscale Discussion | SPC | 63 min |
| Jun 13, 7:07 PM MDT | Severe Thunderstorm Warning | RIW | 38 min |
| Jun 13, 7:27 PM MDT | Tornado Warning | RIW | 33 min |
| Jun 13, 8:33 PM MDT | Severe Thunderstorm Warning | RIW | 42 min |
| Jun 13, 9:11 PM MDT | Flash Flood Warning | RIW | 2 hr |
| Jul 1, 1:06 PM MDT | Special Weather Statement | RIW | 39 min |
| Jul 1, 7:04 PM MDT | Areal Flood Advisory | RIW | 58 min |
| Jul 2, 2:55 PM MDT | Special Weather Statement | RIW | 50 min |
| Jul 2, 3:06 PM MDT | Severe Thunderstorm Warning | RIW | 24 min |
| Jul 2, 4:20 PM MDT | Special Weather Statement | RIW | 40 min |
| Jul 2, 6:49 PM MDT | Special Weather Statement | RIW | 56 min |
| Jul 2, 7:33 PM MDT | Areal Flood Advisory | RIW | 117 min |
| Jul 2, 7:50 PM MDT | Special Weather Statement | RIW | 40 min |
| Jul 3, 5:10 PM MDT | Special Weather Statement | RIW | 50 min |
| Jul 3, 5:47 PM MDT | Special Weather Statement | RIW | 58 min |
| Jul 3, 5:55 PM MDT | Special Weather Statement | RIW | 35 min |
| Jul 3, 6:21 PM MDT | Flash Flood Warning | RIW | 6 hr |
| Jul 4, 12:31 PM MDT | Special Weather Statement | RIW | 59 min |
| Jul 4, 8:37 PM MDT | Flash Flood Watch | RIW | 3 hr |
| Jul 6, 3:00 PM MDT | Special Weather Statement | RIW | 45 min |
| Jul 6, 4:03 PM MDT | Flash Flood Watch | RIW | 4 hr |
| Jul 6, 5:32 PM MDT | Special Weather Statement | RIW | 43 min |
| Jul 6, 5:53 PM MDT | Areal Flood Advisory | RIW | 3 hr |
| Jul 7, 5:29 PM MDT | Special Weather Statement | RIW | 46 min |
| Jul 7, 8:25 PM MDT | Severe Thunderstorm Warning | RIW | 50 min |
| Jul 12, 1:51 PM MDT | Special Weather Statement | RIW | 39 min |
| Jul 12, 2:05 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jul 12, 2:42 PM MDT | Severe Thunderstorm Warning | RIW | 63 min |
| Jul 12, 3:46 PM MDT | Severe Thunderstorm Warning | RIW | 29 min |
| Jul 12, 7:32 PM MDT | Special Weather Statement | RIW | 58 min |
| Jul 12, 8:45 PM MDT | Special Weather Statement | RIW | 60 min |
| Jul 13, 1:18 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jul 19, 5:12 PM MDT | Special Weather Statement | RIW | 63 min |
| Jul 19, 6:16 PM MDT | Special Weather Statement | RIW | 59 min |
| Jul 20, 2:25 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 27, 12:10 AM MDT | Special Weather Statement | RIW | 95 min |
| Jul 27, 3:02 PM MDT | Special Weather Statement | RIW | 43 min |
| Jul 27, 3:39 PM MDT | Special Weather Statement | RIW | 51 min |
| Jul 27, 3:48 PM MDT | Severe Thunderstorm Warning | RIW | 42 min |
| Jul 27, 3:56 PM MDT | Areal Flood Advisory | RIW | 2 hr |
| Jul 27, 5:26 PM MDT | Special Weather Statement | RIW | 64 min |
| Jul 27, 5:55 PM MDT | Special Weather Statement | RIW | 50 min |
| Jul 28, 7:10 PM MDT | Severe Thunderstorm Warning | RIW | 38 min |
| Jul 28, 8:00 PM MDT | Special Weather Statement | RIW | 30 min |
| Jul 28, 9:01 PM MDT | Special Weather Statement | RIW | 44 min |
| Aug 3, 4:27 PM MDT | Special Weather Statement | RIW | 63 min |
| Aug 6, 11:34 PM MDT | Special Weather Statement | RIW | 56 min |
| Aug 7, 1:24 AM MDT | Special Weather Statement | RIW | 51 min |
| Aug 7, 11:40 PM MDT | Special Weather Statement | RIW | 65 min |
| Aug 8, 2:18 AM MDT | Severe Thunderstorm Warning | RIW | 42 min |
| Aug 8, 2:34 AM MDT | Severe Thunderstorm Warning | RIW | 26 min |
| Aug 8, 4:09 AM MDT | Special Weather Statement | RIW | 66 min |
| Aug 8, 1:59 PM MDT | Special Weather Statement | RIW | 46 min |
| Aug 8, 2:38 PM MDT | Special Weather Statement | RIW | 52 min |
| Aug 8, 3:37 PM MDT | Special Weather Statement | RIW | 38 min |
| Aug 14, 2:42 PM MDT | Special Weather Statement | RIW | 48 min |
| Aug 14, 4:00 PM MDT | Special Weather Statement | RIW | 30 min |
| Aug 14, 4:29 PM MDT | Special Weather Statement | RIW | 46 min |
| Aug 15, 3:09 AM MDT | Winter Weather Advisory | RIW | 12 hr |
| Aug 15, 8:55 PM MDT | Special Weather Statement | RIW | 50 min |
| Aug 25, 1:57 PM MDT | Special Weather Statement | RIW | 63 min |
| Aug 25, 3:34 PM MDT | Special Weather Statement | RIW | 56 min |
| Aug 25, 4:52 PM MDT | Special Weather Statement | RIW | 53 min |
| Aug 25, 5:26 PM MDT | Special Weather Statement | RIW | 49 min |
| Aug 31, 4:33 PM MDT | Special Weather Statement | RIW | 42 min |
| Aug 31, 5:06 PM MDT | Special Weather Statement | RIW | 29 min |
| Sep 1, 1:49 PM MDT | Red Flag Warning | RIW | 4 hr |
| Sep 2, 3:23 PM MDT | Special Weather Statement | RIW | 67 min |
| Sep 7, 6:41 PM MDT | Special Weather Statement | RIW | 49 min |
| Sep 15, 6:05 PM MDT | Special Weather Statement | RIW | 55 min |
| Sep 20, 2:41 PM MDT | Winter Weather Advisory | RIW | 18 hr |
| Sep 20, 4:38 PM MDT | Special Weather Statement | RIW | 37 min |
| Sep 20, 5:02 PM MDT | Special Weather Statement | RIW | 43 min |
| Sep 20, 5:14 PM MDT | Special Weather Statement | RIW | 46 min |
| Sep 20, 6:29 PM MDT | Severe Thunderstorm Warning | RIW | 46 min |
| Sep 20, 9:40 PM MDT | Freeze Watch | RIW | 17 hr |
| Sep 21, 2:53 PM MDT | Freeze Warning | RIW | 18 hr |
| Sep 27, 1:57 PM MDT | Freeze Warning | RIW | 20 hr |
| Sep 28, 2:46 PM MDT | Fire Weather Watch | RIW | 12 hr |
| Sep 29, 2:46 AM MDT | Red Flag Warning | RIW | 18 hr |
| Sep 30, 2:57 AM MDT | Winter Storm Watch | RIW | 9 hr |
| Sep 30, 2:57 AM MDT | Winter Weather Advisory | RIW | 29 hr |
| Oct 3, 2:01 AM MDT | Winter Storm Watch | RIW | 29 hr |
| Oct 4, 3:55 AM MDT | Winter Storm Warning | RIW | 32 hr |
| Oct 4, 3:55 AM MDT | Winter Weather Advisory | RIW | 38 hr |
| Oct 7, 2:42 PM MDT | Winter Weather Advisory | RIW | 18 hr |
| Oct 8, 2:37 PM MDT | Winter Weather Advisory | RIW | 33 hr |
| Oct 10, 3:19 PM MDT | Winter Weather Advisory | RIW | 27 hr |
| Oct 25, 2:10 PM MDT | High Wind Watch | RIW | 34 hr |
| Oct 27, 3:42 PM MDT | Winter Storm Warning | RIW | 35 hr |
| Oct 29, 9:55 PM MDT | Winter Weather Advisory | RIW | 12 hr |
| Nov 5, 2:03 PM MST | High Wind Watch | RIW | 6 hr |
| Nov 6, 1:31 PM MST | High Wind Warning | RIW | 3 hr |
| Dec 5, 11:01 AM MST | Winter Weather Advisory | RIW | 28 hr |
| Dec 12, 10:07 AM MST | Winter Weather Advisory | RIW | 40 hr |
| Dec 14, 3:16 PM MST | High Wind Watch | RIW | 11 hr |
| Dec 15, 1:58 AM MST | High Wind Warning | RIW | 21 hr |
| Dec 22, 10:08 PM MST | Winter Weather Advisory | RIW | 25 hr |
| Dec 25, 2:40 AM MST | Winter Weather Advisory | RIW | 36 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 | 16 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 5 |
| Special Weather Statement | 48 |
| Flooding | |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 2 |
| Areal Flood Advisory | 4 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 10 |
| Winter Storm Watch | 10 |
| Winter Weather Advisory | 29 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 1 |
| Wind and dust | |
| High Wind Warning | 6 |
| High Wind Watch | 7 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| 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 archive20082010
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.