Alert archive / Montana / Sheridan County
Weather alerts in Sheridan County, Montana, 2012
122 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sheridan County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 122
- Warnings
- 36
- Watches
- 27
- Advisories
- 30
- Busiest month
- July21 alerts
- Busiest day
- June 24, 20125 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sheridan County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 11 | 10 | 9% | 8 | 100% | 16 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: severe thunderstorm warnings | 90 | 66 | 27% | 135 | 79% | 29 min |
| NWS Glasgow, MT: flash flood warnings | 1 | 0 | 100% | 2 | 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 4, 2:38 PM MST | High Wind Watch | GGW | 13 hr |
| Jan 10, 2:29 PM MST | Wind Chill Advisory | GGW | 37 hr |
| Jan 15, 5:16 AM MST | Wind Chill Advisory | GGW | 28 hr |
| Jan 17, 12:45 AM MST | Wind Chill Advisory | GGW | 11 hr |
| Jan 17, 4:10 AM MST | Wind Chill Watch | GGW | 11 hr |
| Jan 17, 3:11 PM MST | Wind Chill Warning | GGW | 43 hr |
| Jan 17, 3:11 PM MST | Wind Chill Advisory | GGW | 54 hr |
| Jan 25, 3:17 AM MST | Freezing Rain Advisory | GGW | 4 hr |
| Jan 25, 3:32 AM MST | High Wind Warning | GGW | 17 hr |
| Feb 3, 9:03 AM MST | Dense Fog Advisory | GGW | 26 hr |
| Feb 10, 3:04 AM MST | Wind Chill Advisory | GGW | 6 hr |
| Feb 24, 3:27 PM MST | Winter Weather Advisory | GGW | 43 hr |
| Mar 1, 2:18 AM MST | Winter Weather Advisory | GGW | 9 hr |
| Mar 1, 2:51 PM MST | Winter Weather Advisory | GGW | 20 hr |
| Mar 13, 3:35 AM MDT | High Wind Warning | GGW | 20 hr |
| Mar 13, 3:54 AM MDT | Red Flag Warning | GGW | 24 hr |
| Mar 15, 3:54 AM MDT | Fire Weather Watch | GGW | 24 hr |
| Mar 16, 3:53 AM MDT | Red Flag Warning | GGW | 41 hr |
| Mar 20, 3:00 PM MDT | Fire Weather Watch | GGW | 24 hr |
| Mar 21, 2:34 PM MDT | Red Flag Warning | GGW | 30 hr |
| Mar 28, 6:24 AM MDT | Dense Fog Advisory | GGW | 5 hr |
| Mar 29, 4:20 AM MDT | Fire Weather Watch | GGW | 24 hr |
| Mar 30, 3:53 AM MDT | Red Flag Warning | GGW | 17 hr |
| Mar 31, 2:41 PM MDT | Red Flag Warning | GGW | 30 hr |
| Apr 3, 3:55 AM MDT | Fire Weather Watch | GGW | 11 hr |
| Apr 3, 2:51 PM MDT | Red Flag Warning | GGW | 30 hr |
| Apr 5, 4:18 AM MDT | Blizzard Watch | GGW | 36 hr |
| Apr 6, 3:20 PM MDT | Winter Weather Advisory | GGW | 17 hr |
| Apr 11, 3:44 AM MDT | Red Flag Warning | GGW | 17 hr |
| Apr 20, 5:23 AM MDT | Dense Fog Advisory | GGW | 5 hr |
| Apr 23, 2:56 PM MDT | Fire Weather Watch | GGW | 13 hr |
| May 4, 7:41 PM MDT | Special Weather Statement | GGW | 64 min |
| May 4, 8:25 PM MDT | Special Weather Statement | GGW | 35 min |
| May 4, 9:04 PM MDT | Special Weather Statement | GGW | 56 min |
| May 4, 11:30 PM MDT | Dense Fog Advisory | GGW | 11 hr |
| May 22, 2:50 PM MDT | Special Weather Statement | GGW | 55 min |
| May 22, 2:57 PM MDT | Severe Thunderstorm Warning | GGW | 42 min |
| Jun 2, 2:10 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 8, 5:07 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jun 8, 5:41 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 8, 10:38 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jun 9, 1:58 AM MDT | Severe Thunderstorm Warning | GGW | 62 min |
| Jun 13, 7:15 PM MDT | Severe Thunderstorm Warning | GGW | 42 min |
| Jun 18, 3:26 PM MDT | Special Weather Statement | GGW | 49 min |
| Jun 18, 5:19 PM MDT | Special Weather Statement | GGW | 11 min |
| Jun 24, 3:47 AM MDT | Mesoscale Discussion | SPC | 88 min |
| Jun 24, 7:25 AM MDT | Severe Thunderstorm Warning | GGW | 65 min |
| Jun 24, 8:16 AM MDT | Mesoscale Discussion | SPC | 89 min |
| Jun 24, 8:31 AM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 24, 11:24 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 4:01 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 25, 7:12 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jun 26, 2:06 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jun 26, 5:55 PM MDT | High Wind Warning | GGW | 2 hr |
| Jun 26, 7:33 PM MDT | Special Weather Statement | GGW | 57 min |
| Jun 26, 8:03 PM MDT | Severe Thunderstorm Warning | GGW | 37 min |
| Jul 1, 2:40 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 1, 4:04 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 1, 6:35 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 2, 12:23 AM MDT | Mesoscale Discussion | SPC | 97 min |
| Jul 2, 12:43 AM MDT | Severe Thunderstorm Warning | GGW | 62 min |
| Jul 2, 1:46 AM MDT | Special Weather Statement | GGW | 29 min |
| Jul 3, 12:58 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jul 3, 1:41 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 3, 4:25 PM MDT | Severe Thunderstorm Warning | GGW | 65 min |
| Jul 3, 5:15 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 5:26 PM MDT | Severe Thunderstorm Warning | GGW | 64 min |
| Jul 3, 6:23 PM MDT | Severe Thunderstorm Warning | GGW | 52 min |
| Jul 3, 7:13 PM MDT | Special Weather Statement | GGW | 62 min |
| Jul 3, 7:36 PM MDT | Severe Thunderstorm Warning | GGW | 54 min |
| Jul 11, 4:36 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jul 14, 7:02 PM MDT | Special Weather Statement | GGW | 58 min |
| Jul 17, 11:15 PM MDT | Special Weather Statement | GGW | 60 min |
| Jul 21, 4:41 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 24, 2:04 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jul 28, 2:56 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Jul 28, 3:46 PM MDT | Special Weather Statement | GGW | 59 min |
| Jul 31, 9:46 PM MDT | Fire Weather Watch | GGW | 30 hr |
| Aug 1, 2:09 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Aug 1, 3:25 PM MDT | Severe Thunderstorm Warning | GGW | 65 min |
| Aug 2, 2:03 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 2, 6:10 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Aug 22, 2:27 PM MDT | Fire Weather Watch | GGW | 24 hr |
| Aug 23, 2:33 PM MDT | Red Flag Warning | GGW | 33 hr |
| Aug 25, 3:20 AM MDT | Red Flag Warning | GGW | 18 hr |
| Aug 27, 2:57 AM MDT | Fire Weather Watch | GGW | 24 hr |
| Aug 28, 3:25 AM MDT | Red Flag Warning | GGW | 43 hr |
| Aug 30, 3:00 PM MDT | Fire Weather Watch | GGW | 12 hr |
| Aug 31, 2:57 AM MDT | Red Flag Warning | GGW | 66 hr |
| Sep 3, 2:41 AM MDT | Fire Weather Watch | GGW | 12 hr |
| Sep 7, 2:28 PM MDT | Fire Weather Watch | GGW | 48 hr |
| Sep 8, 2:12 PM MDT | Red Flag Warning | GGW | 3 days |
| Sep 12, 3:32 AM MDT | Red Flag Warning | GGW | 16 hr |
| Sep 12, 2:29 PM MDT | Fire Weather Watch | GGW | 24 hr |
| Sep 13, 3:58 AM MDT | Red Flag Warning | GGW | 16 hr |
| Sep 13, 2:16 PM MDT | Red Flag Warning | GGW | 30 hr |
| Sep 18, 3:03 AM MDT | Red Flag Warning | GGW | 18 hr |
| Sep 18, 2:32 PM MDT | Fire Weather Watch | GGW | 12 hr |
| Sep 19, 2:56 AM MDT | Red Flag Warning | GGW | 16 hr |
| Oct 15, 3:00 PM MDT | Fire Weather Watch | GGW | 23 hr |
| Oct 15, 3:07 PM MDT | High Wind Watch | GGW | 12 hr |
| Oct 15, 3:07 PM MDT | High Wind Warning | GGW | 53 hr |
| Oct 16, 2:28 PM MDT | Red Flag Warning | GGW | 12 hr |
| Oct 30, 12:44 AM MDT | Dense Fog Advisory | GGW | 8 hr |
| Nov 1, 8:34 PM MDT | Freezing Rain Advisory | GGW | 15 hr |
| Nov 3, 2:23 PM MDT | Freezing Rain Advisory | GGW | 19 hr |
| Nov 4, 10:16 PM MST | Dense Fog Advisory | GGW | 10 hr |
| Nov 5, 3:09 PM MST | Winter Storm Watch | GGW | 48 hr |
| Nov 7, 3:03 PM MST | Blizzard Warning | GGW | 48 hr |
| Nov 7, 3:03 PM MST | Winter Storm Warning | GGW | 3 days |
| Nov 11, 1:48 PM MST | Wind Chill Advisory | GGW | 14 hr |
| Nov 14, 3:23 AM MST | Dense Fog Advisory | GGW | 5 hr |
| Nov 21, 3:24 AM MST | Winter Weather Advisory | GGW | 30 hr |
| Nov 24, 5:03 AM MST | Freezing Rain Advisory | GGW | 4 hr |
| Nov 26, 10:34 PM MST | Dense Fog Advisory | GGW | 9 hr |
| Nov 27, 8:36 PM MST | Dense Fog Advisory | GGW | 7 hr |
| Nov 30, 4:59 PM MST | Freezing Rain Advisory | GGW | 6 hr |
| Dec 1, 3:16 PM MST | Dense Fog Advisory | GGW | 15 hr |
| Dec 13, 6:14 PM MST | Dense Fog Advisory | GGW | 27 hr |
| Dec 15, 10:50 AM MST | Dense Fog Advisory | GGW | 24 hr |
| Dec 16, 11:02 AM MST | Dense Fog Advisory | GGW | 2 hr |
| Dec 22, 2:24 PM MST | Winter Weather Advisory | GGW | 28 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 | 11 |
| Severe Thunderstorm Watch | 8 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 12 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 1 |
| Blizzard Watch | 1 |
| Winter Storm Watch | 1 |
| Freezing Rain Advisory | 5 |
| Winter Weather Advisory | 6 |
| Cold | |
| Wind Chill Warning | 1 |
| Wind Chill Watch | 1 |
| Wind Chill Advisory | 6 |
| Wind and dust | |
| High Wind Warning | 4 |
| High Wind Watch | 2 |
| Fire | |
| Red Flag Warning | 18 |
| Fire Weather Watch | 14 |
| Fog and smoke | |
| Dense Fog Advisory | 13 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20112013
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.