Alert archive / Wyoming / Laramie County
Weather alerts in Laramie County, Wyoming, 2009
133 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Laramie County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 133
- Warnings
- 45
- Watches
- 26
- Advisories
- 22
- Busiest month
- June37 alerts
- Busiest day
- June 5, 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.
1 of 3 tornado warnings covering Laramie County in 2009 had a tornado report inside them.
Laramie County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 0 | ||
| Severe thunderstorm warnings | 32 | 12 | 63% | 26 | 58% | 24 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Cheyenne, WY: tornado warnings | 28 | 10 | 64% | 26 | 69% | 18 min |
| NWS Cheyenne, WY: severe thunderstorm warnings | 186 | 86 | 54% | 227 | 66% | 20 min |
| NWS Cheyenne, WY: flash flood warnings | 25 | 14 | 44% | 26 | 69% | 70 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 |
|---|---|---|---|
| Apr 4, 4:57 AM MDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 28, 4:45 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| May 20, 2:01 PM MDT | Mesoscale Discussion | SPC | 89 min |
| May 22, 6:29 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 7:27 PM MDT | Areal Flood Advisory | CYS | 3 hr |
| May 22, 7:50 PM MDT | Areal Flood Advisory | CYS | 3 hr |
| May 30, 4:18 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jun 4, 4:12 PM MDT | Severe Thunderstorm Warning | CYS | 48 min |
| Jun 4, 6:08 PM MDT | Severe Thunderstorm Warning | CYS | 52 min |
| Jun 4, 6:56 PM MDT | Severe Thunderstorm Warning | CYS | 42 min |
| Jun 5, 2:18 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jun 5, 2:48 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 5, 4:10 PM MDT | Tornado Warning | CYS | 35 min |
| Jun 5, 4:42 PM MDT | Tornado Warning | CYS | 21 min |
| Jun 5, 5:37 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jun 7, 5:40 AM MDT | Severe Thunderstorm Warning | CYS | 42 min |
| Jun 7, 10:43 AM MDT | Special Weather Statement | BOU | 32 min |
| Jun 7, 10:44 AM MDT | Mesoscale Discussion | SPC | 61 min |
| Jun 7, 1:00 PM MDT | Tornado Warning | CYS | 45 min |
| Jun 7, 1:19 PM MDT | Severe Thunderstorm Warning | CYS | 22 min |
| Jun 8, 2:03 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jun 10, 2:47 PM MDT | Severe Thunderstorm Warning | CYS | 33 min |
| Jun 10, 3:19 PM MDT | Severe Thunderstorm Warning | CYS | 26 min |
| Jun 11, 4:44 PM MDT | Severe Thunderstorm Warning | CYS | 61 min |
| Jun 13, 12:41 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Jun 13, 1:56 PM MDT | Tornado Watch | SPC | 9 hr |
| Jun 14, 1:06 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jun 14, 1:50 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 14, 4:12 PM MDT | Severe Thunderstorm Warning | CYS | 35 min |
| Jun 15, 3:47 PM MDT | Areal Flood Advisory | CYS | 4 hr |
| Jun 17, 2:30 PM MDT | Tornado Watch | SPC | 8 hr |
| Jun 17, 4:43 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jun 22, 11:24 PM MDT | Areal Flood Advisory | CYS | 3 hr |
| Jun 22, 11:37 PM MDT | Severe Thunderstorm Warning | CYS | 38 min |
| Jun 23, 2:18 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jun 23, 2:51 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 23, 4:58 PM MDT | Severe Thunderstorm Warning | CYS | 62 min |
| Jun 23, 5:43 PM MDT | Severe Thunderstorm Warning | CYS | 62 min |
| Jun 23, 6:13 PM MDT | Mesoscale Discussion | SPC | 62 min |
| Jun 25, 1:06 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jun 25, 1:30 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 4:22 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jun 25, 5:50 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jun 26, 2:38 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 1, 12:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Jul 2, 2:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 2, 3:05 PM MDT | Severe Thunderstorm Warning | CYS | 40 min |
| Jul 2, 3:44 PM MDT | Severe Thunderstorm Warning | CYS | 41 min |
| Jul 2, 4:02 PM MDT | Severe Thunderstorm Warning | CYS | 58 min |
| Jul 5, 3:05 PM MDT | Severe Thunderstorm Warning | CYS | 40 min |
| Jul 5, 3:34 PM MDT | Severe Thunderstorm Warning | CYS | 30 min |
| Jul 6, 12:22 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 6, 1:40 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jul 6, 2:07 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 6, 5:35 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 10, 9:15 PM MDT | Severe Thunderstorm Warning | CYS | 45 min |
| Jul 11, 3:35 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 11, 3:56 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 11, 7:41 PM MDT | Severe Thunderstorm Warning | CYS | 64 min |
| Jul 11, 7:46 PM MDT | Mesoscale Discussion | SPC | 59 min |
| Jul 11, 7:56 PM MDT | Severe Thunderstorm Warning | CYS | 51 min |
| Jul 12, 2:05 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jul 12, 3:50 PM MDT | Severe Thunderstorm Warning | CYS | 55 min |
| Jul 12, 4:17 PM MDT | Severe Thunderstorm Warning | CYS | 32 min |
| Jul 13, 1:45 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 13, 3:36 PM MDT | Severe Thunderstorm Warning | CYS | 54 min |
| Jul 13, 4:04 PM MDT | Areal Flood Advisory | CYS | 114 min |
| Jul 16, 9:02 PM MDT | Severe Thunderstorm Warning | CYS | 44 min |
| Jul 17, 12:06 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jul 17, 12:59 PM MDT | Tornado Watch | SPC | 6 hr |
| Jul 18, 1:35 AM MDT | Severe Thunderstorm Warning | CYS | 42 min |
| Jul 20, 2:25 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 20, 5:26 PM MDT | Severe Thunderstorm Warning | CYS | 35 min |
| Jul 20, 5:58 PM MDT | Severe Thunderstorm Warning | CYS | 51 min |
| Jul 21, 2:44 PM MDT | Mesoscale Discussion | SPC | 61 min |
| Jul 22, 1:16 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jul 24, 2:03 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jul 25, 3:45 PM MDT | Areal Flood Advisory | CYS | 2 hr |
| Jul 27, 2:58 PM MDT | Severe Thunderstorm Warning | CYS | 47 min |
| Aug 4, 5:19 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Aug 4, 6:40 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Aug 5, 3:51 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Aug 5, 4:15 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 7, 5:37 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Aug 8, 3:34 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Aug 8, 7:20 PM MDT | Severe Thunderstorm Warning | CYS | 29 min |
| Aug 8, 7:29 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 8, 8:17 PM MDT | Areal Flood Advisory | CYS | 2 hr |
| Aug 10, 1:07 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Aug 10, 4:38 PM MDT | Severe Thunderstorm Warning | CYS | 52 min |
| Aug 10, 4:43 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 15, 1:07 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Aug 23, 6:52 PM MDT | Severe Thunderstorm Warning | CYS | 53 min |
| Aug 23, 7:10 PM MDT | Severe Thunderstorm Warning | CYS | 50 min |
| Oct 9, 4:18 AM MDT | Winter Storm Watch | CYS | 10 hr |
| Oct 9, 2:27 PM MDT | Winter Weather Advisory | CYS | 19 hr |
| Oct 9, 10:20 PM MDT | Mesoscale Discussion | SPC | 4 hr |
| Oct 10, 2:26 PM MDT | Winter Weather Advisory | CYS | 28 hr |
| Oct 12, 8:35 PM MDT | Freezing Fog Advisory | CYS | 13 hr |
| Oct 12, 10:19 PM MDT | Freezing Rain Advisory | CYS | 10 hr |
| Oct 13, 8:38 AM MDT | Winter Weather Advisory | CYS | 82 min |
| Oct 14, 3:24 AM MDT | High Wind Warning | CYS | 15 hr |
| Oct 23, 9:47 AM MDT | High Wind Warning | CYS | 23 hr |
| Oct 25, 12:27 PM MDT | High Wind Watch | CYS | 34 hr |
| Oct 26, 4:30 PM MDT | Winter Storm Watch | CYS | 36 hr |
| Oct 27, 5:19 AM MDT | Winter Storm Warning | CYS | 66 hr |
| Oct 28, 12:13 PM MDT | Mesoscale Discussion | SPC | 6 hr |
| Oct 28, 9:56 PM MDT | Mesoscale Discussion | SPC | 4 hr |
| Oct 29, 9:30 PM MDT | Winter Weather Advisory | CYS | 21 hr |
| Nov 5, 3:47 AM MST | High Wind Watch | CYS | 11 hr |
| Nov 5, 2:18 PM MST | High Wind Warning | CYS | 25 hr |
| Nov 12, 7:53 PM MST | Winter Weather Advisory | CYS | 19 hr |
| Nov 13, 2:34 PM MST | Winter Storm Watch | CYS | 21 hr |
| Nov 14, 11:20 AM MST | Winter Storm Warning | CYS | 19 hr |
| Nov 14, 11:20 AM MST | Winter Weather Advisory | CYS | 19 hr |
| Dec 4, 3:02 AM MST | High Wind Warning | CYS | 17 hr |
| Dec 5, 3:43 AM MST | Winter Storm Watch | CYS | 18 hr |
| Dec 5, 5:00 PM MST | Winter Weather Advisory | CYS | 21 hr |
| Dec 7, 2:04 AM MST | Winter Storm Watch | CYS | 12 hr |
| Dec 7, 1:45 PM MST | Winter Weather Advisory | CYS | 23 hr |
| Dec 8, 2:49 PM MST | Wind Chill Advisory | CYS | 20 hr |
| Dec 8, 2:49 PM MST | Winter Weather Advisory | CYS | 45 hr |
| Dec 9, 3:19 AM MST | High Wind Watch | CYS | 6 hr |
| Dec 9, 5:33 AM MST | High Wind Warning | CYS | 35 hr |
| Dec 9, 2:44 PM MST | Wind Chill Advisory | CYS | 18 hr |
| Dec 12, 1:18 PM MST | High Wind Warning | CYS | 3 hr |
| Dec 14, 1:41 PM MST | High Wind Watch | CYS | 15 hr |
| Dec 15, 5:04 AM MST | High Wind Warning | CYS | 17 hr |
| Dec 20, 5:17 AM MST | High Wind Watch | CYS | 8 hr |
| Dec 20, 1:22 PM MST | High Wind Warning | CYS | 23 hr |
| Dec 21, 5:07 AM MST | Winter Storm Watch | CYS | 23 hr |
| Dec 22, 4:22 AM MST | Winter Weather Advisory | CYS | 46 hr |
| Dec 24, 1:34 PM MST | Winter Weather Advisory | CYS | 51 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 | 32 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 39 |
| Special Weather Statement | 1 |
| Flooding | |
| Areal Flood Advisory | 7 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 6 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 11 |
| Cold | |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 8 |
| High Wind Watch | 5 |
| Fog and smoke | |
| Freezing 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.