Alert archive / Wyoming / Carbon County
Weather alerts in Carbon County, Wyoming, 2009
39 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Carbon County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 39
- Warnings
- 14
- Watches
- 9
- Advisories
- 14
- Busiest month
- December17 alerts
- Busiest day
- December 9, 20093 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Carbon County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 0 | 100% | 2 | 0% | |
| 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 |
|---|---|---|---|
| Mar 9, 8:49 PM MDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 25, 5:11 PM MDT | Severe Thunderstorm Warning | CYS | 37 min |
| May 20, 3:59 PM MDT | Severe Thunderstorm Warning | CYS | 32 min |
| Jul 6, 1:40 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Oct 9, 2:27 PM MDT | Winter Weather Advisory | CYS | 19 hr |
| Oct 10, 2:26 PM MDT | Winter Weather Advisory | CYS | 28 hr |
| 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, 1:32 PM MDT | Winter Weather Advisory | CYS | 22 hr |
| Oct 29, 9:30 PM MDT | Winter Weather Advisory | CYS | 21 hr |
| Oct 30, 11:03 PM MDT | High Wind Warning | CYS | 6 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 11, 3:24 PM MST | Winter Weather Advisory | CYS | 44 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 |
| Nov 21, 9:14 AM MST | High Wind Warning | CYS | 3 hr |
| Nov 24, 2:41 AM MST | High Wind Warning | CYS | 4 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, 4:02 PM MST | Winter Weather Advisory | CYS | 37 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 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 | 2 |
| Mesoscale Discussion | 2 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 12 |
| Cold | |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 10 |
| High Wind Watch | 5 |
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.