Alert archive / Montana / Prairie County
Weather alerts in Prairie County, Montana, 2011
150 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Prairie County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 150
- Warnings
- 44
- Watches
- 35
- Advisories
- 35
- Busiest month
- July36 alerts
- Busiest day
- July 22, 20119 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Prairie County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 9 | 44% | 7 | 57% | 34 min |
| Flash flood warnings | 3 | 1 | 67% | 1 | 0% |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: tornado warnings | 12 | 3 | 75% | 2 | 100% | 22 min |
| NWS Glasgow, MT: severe thunderstorm warnings | 173 | 81 | 53% | 170 | 78% | 27 min |
| NWS Glasgow, MT: flash flood warnings | 29 | 10 | 66% | 25 | 72% | 93 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 |
|---|---|---|---|
| Dec 31, 9:20 PM MST | Wind Chill Advisory | GGW | 16 hr |
| Jan 2, 11:13 AM MST | Winter Weather Advisory | GGW | 17 hr |
| Jan 6, 3:05 PM MST | Winter Storm Watch | GGW | 24 hr |
| Jan 7, 3:20 PM MST | Winter Weather Advisory | GGW | 43 hr |
| Jan 9, 3:00 PM MST | Wind Chill Advisory | GGW | 19 hr |
| Jan 10, 3:13 PM MST | Wind Chill Advisory | GGW | 18 hr |
| Jan 14, 3:49 AM MST | Winter Weather Advisory | GGW | 24 hr |
| Jan 16, 3:17 AM MST | Freezing Rain Advisory | GGW | 23 hr |
| Jan 17, 7:24 PM MST | Winter Weather Advisory | GGW | 17 hr |
| Jan 19, 3:04 PM MST | Wind Chill Advisory | GGW | 12 hr |
| Jan 20, 3:07 PM MST | Winter Storm Watch | GGW | 13 hr |
| Jan 21, 3:56 AM MST | Winter Weather Advisory | GGW | 32 hr |
| Jan 22, 7:40 AM MST | Blizzard Warning | GGW | 4 hr |
| Jan 22, 10:06 AM MST | Winter Weather Advisory | GGW | 3 hr |
| Jan 29, 12:33 AM MST | Winter Weather Advisory | GGW | 6 hr |
| Jan 29, 9:26 AM MST | Winter Weather Advisory | GGW | 36 hr |
| Jan 30, 2:32 PM MST | Wind Chill Advisory | GGW | 44 hr |
| Jan 31, 2:53 PM MST | Wind Chill Warning | GGW | 20 hr |
| Feb 1, 11:11 AM MST | Wind Chill Advisory | GGW | 24 hr |
| Feb 4, 2:30 PM MST | Winter Weather Advisory | GGW | 29 hr |
| Feb 6, 3:21 PM MST | Wind Chill Advisory | GGW | 43 hr |
| Feb 8, 2:28 PM MST | Wind Chill Advisory | GGW | 20 hr |
| Feb 10, 3:26 AM MST | Winter Weather Advisory | GGW | 31 hr |
| Feb 11, 2:56 PM MST | High Wind Warning | GGW | 47 hr |
| Feb 12, 3:00 PM MST | High Wind Watch | GGW | 12 hr |
| Feb 13, 2:01 PM MST | High Wind Warning | GGW | 4 hr |
| Feb 16, 3:16 PM MST | Winter Weather Advisory | GGW | 23 hr |
| Feb 18, 2:29 PM MST | Winter Storm Watch | GGW | 24 hr |
| Feb 19, 2:30 PM MST | Winter Storm Warning | GGW | 27 hr |
| Feb 23, 3:23 AM MST | Wind Chill Advisory | GGW | 57 hr |
| Feb 25, 2:31 PM MST | Wind Chill Advisory | GGW | 22 hr |
| Feb 28, 2:53 PM MST | Winter Weather Advisory | GGW | 20 hr |
| Mar 1, 11:00 AM MST | Wind Chill Advisory | GGW | 27 hr |
| Mar 14, 4:34 AM MDT | Flood Watch | GGW | 3 days |
| Mar 16, 11:54 AM MDT | Areal Flood Warning | GGW | 72 hr |
| Mar 19, 12:31 PM MDT | Areal Flood Warning | GGW | 49 hr |
| Mar 21, 3:50 PM MDT | Winter Weather Advisory | GGW | 46 hr |
| Apr 1, 3:50 AM MDT | Winter Storm Watch | GGW | 24 hr |
| Apr 17, 3:09 PM MDT | Winter Storm Watch | GGW | 24 hr |
| Apr 18, 3:03 PM MDT | Winter Weather Advisory | GGW | 29 hr |
| Apr 22, 4:07 AM MDT | Winter Weather Advisory | GGW | 11 hr |
| Apr 29, 3:16 PM MDT | Winter Weather Advisory | GGW | 12 hr |
| Apr 30, 10:34 AM MDT | High Wind Warning | GGW | 7 hr |
| May 9, 8:39 PM MDT | Flood Watch | GGW | 23 hr |
| May 10, 8:31 AM MDT | Areal Flood Advisory | GGW | 23 hr |
| May 17, 9:01 AM MDT | Flood Watch | GGW | 3 hr |
| May 17, 11:53 AM MDT | Areal Flood Warning | GGW | 48 hr |
| May 18, 2:47 PM MDT | Flood Watch | GGW | 44 hr |
| May 20, 10:06 AM MDT | Areal Flood Warning | GGW | 67 hr |
| May 20, 8:50 PM MDT | Special Weather Statement | GGW | 55 min |
| May 20, 9:51 PM MDT | Special Weather Statement | GGW | 54 min |
| May 23, 4:29 AM MDT | Areal Flood Warning | GGW | 3 days |
| May 27, 3:24 AM MDT | Flood Watch | GGW | 4 days |
| May 30, 12:55 AM MDT | Areal Flood Warning | GGW | 36 hr |
| May 30, 2:51 AM MDT | High Wind Watch | GGW | 18 hr |
| Jun 2, 1:54 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Jun 2, 2:09 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 2, 3:49 PM MDT | Severe Thunderstorm Warning | GGW | 29 min |
| Jun 2, 4:46 PM MDT | Severe Thunderstorm Warning | GGW | 24 min |
| Jun 6, 10:25 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jun 12, 9:44 AM MDT | Flash Flood Watch | GGW | 11 hr |
| Jun 12, 12:52 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jun 13, 2:35 PM MDT | Flash Flood Watch | GGW | 21 hr |
| Jun 13, 10:55 PM MDT | Special Weather Statement | GGW | 65 min |
| Jun 13, 11:46 PM MDT | Flash Flood Warning | GGW | 4 hr |
| Jun 14, 3:53 AM MDT | Areal Flood Warning | GGW | 8 hr |
| Jun 15, 10:21 PM MDT | Severe Thunderstorm Warning | GGW | 39 min |
| Jun 15, 10:56 PM MDT | Severe Thunderstorm Warning | GGW | 64 min |
| Jun 16, 3:37 AM MDT | Flash Flood Watch | GGW | 40 hr |
| Jun 18, 3:01 PM MDT | Flash Flood Watch | GGW | 36 hr |
| Jun 23, 2:57 PM MDT | Flash Flood Watch | GGW | 13 hr |
| Jun 29, 6:17 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jul 2, 12:17 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Jul 3, 12:31 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 4:08 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 3, 6:29 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 8:02 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Jul 3, 9:53 PM MDT | Special Weather Statement | GGW | 67 min |
| Jul 3, 10:30 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jul 3, 11:00 PM MDT | Special Weather Statement | GGW | 60 min |
| Jul 5, 9:02 PM MDT | Severe Thunderstorm Warning | GGW | 48 min |
| Jul 13, 9:45 PM MDT | Special Weather Statement | BYZ | 60 min |
| Jul 14, 1:56 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 14, 6:33 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Jul 14, 7:58 PM MDT | Severe Thunderstorm Warning | GGW | 62 min |
| Jul 14, 9:33 PM MDT | Severe Thunderstorm Warning | GGW | 57 min |
| Jul 15, 6:26 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Jul 15, 9:40 PM MDT | Flash Flood Warning | GGW | 4 hr |
| Jul 18, 9:01 AM MDT | Heat Advisory | GGW | 35 hr |
| Jul 22, 10:05 AM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 22, 1:06 PM MDT | Mesoscale Discussion | SPC | 24 min |
| Jul 22, 1:25 PM MDT | Tornado Watch | SPC | 8 hr |
| Jul 22, 3:30 PM MDT | Severe Thunderstorm Warning | GGW | 60 min |
| Jul 22, 4:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 22, 4:23 PM MDT | Severe Thunderstorm Warning | GGW | 67 min |
| Jul 22, 4:58 PM MDT | Severe Thunderstorm Warning | GGW | 32 min |
| Jul 22, 5:07 PM MDT | Flash Flood Warning | GGW | 2 hr |
| Jul 22, 5:12 PM MDT | Severe Thunderstorm Warning | GGW | 63 min |
| Jul 22, 6:15 PM MDT | Severe Thunderstorm Warning | GGW | 46 min |
| Jul 25, 5:15 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 25, 5:47 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 25, 9:07 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jul 26, 1:07 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jul 26, 2:43 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 26, 6:05 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jul 26, 6:30 PM MDT | Special Weather Statement | GGW | 30 min |
| Jul 29, 4:46 PM MDT | Mesoscale Discussion | SPC | 59 min |
| Jul 29, 5:02 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 4, 2:24 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Aug 4, 4:49 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 4, 7:36 PM MDT | Flash Flood Watch | GGW | 24 hr |
| Aug 5, 12:05 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 3:05 PM MDT | Special Weather Statement | GGW | 25 min |
| Aug 5, 3:29 PM MDT | Severe Thunderstorm Warning | GGW | 31 min |
| Aug 5, 4:25 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 3:40 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Aug 11, 3:59 PM MDT | Special Weather Statement | GGW | 31 min |
| Aug 11, 4:06 PM MDT | Severe Thunderstorm Warning | GGW | 39 min |
| Aug 11, 5:04 PM MDT | Severe Thunderstorm Warning | GGW | 56 min |
| Aug 14, 5:56 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Aug 15, 4:23 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 15, 8:37 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Aug 21, 3:39 AM MDT | Fire Weather Watch | GGW | 23 hr |
| Aug 21, 8:30 PM MDT | Special Weather Statement | BYZ | 60 min |
| Aug 22, 2:53 AM MDT | Red Flag Warning | GGW | 17 hr |
| Aug 23, 2:48 AM MDT | Red Flag Warning | GGW | 18 hr |
| Aug 24, 2:11 PM MDT | Fire Weather Watch | GGW | 13 hr |
| Aug 25, 3:35 AM MDT | Red Flag Warning | GGW | 17 hr |
| Aug 31, 9:05 PM MDT | Severe Thunderstorm Warning | GGW | 55 min |
| Sep 19, 1:15 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 27, 2:49 PM MDT | Red Flag Warning | GGW | 29 hr |
| Sep 30, 2:19 PM MDT | Fire Weather Watch | GGW | 13 hr |
| Oct 1, 3:41 AM MDT | Red Flag Warning | GGW | 23 hr |
| Oct 3, 2:42 PM MDT | Red Flag Warning | GGW | 29 hr |
| Oct 6, 2:57 PM MDT | High Wind Watch | GGW | 13 hr |
| Oct 7, 4:23 AM MDT | High Wind Warning | GGW | 13 hr |
| Nov 2, 12:29 PM MDT | Fire Weather Watch | GGW | 15 hr |
| Nov 3, 3:23 AM MDT | Red Flag Warning | GGW | 14 hr |
| Nov 3, 2:37 PM MDT | Winter Storm Watch | GGW | 37 hr |
| Nov 5, 3:41 AM MDT | Winter Storm Warning | GGW | 24 hr |
| Nov 18, 3:03 PM MST | Winter Weather Advisory | GGW | 24 hr |
| Nov 29, 2:33 PM MST | Winter Weather Advisory | GGW | 37 hr |
| Dec 3, 3:18 AM MST | Winter Weather Advisory | GGW | 38 hr |
| Dec 12, 9:27 PM MST | Dense Fog Advisory | GGW | 35 hr |
| Dec 21, 1:49 AM MST | Winter Weather Advisory | GGW | 13 hr |
| Dec 26, 2:41 AM MST | High Wind Warning | GGW | 12 hr |
| Dec 28, 3:38 AM MST | High Wind Watch | GGW | 24 hr |
| Dec 29, 4:05 AM MST | High Wind Warning | GGW | 19 hr |
| Dec 30, 3:23 AM MST | High Wind Watch | GGW | 23 hr |
| Dec 31, 2:45 AM MST | High Wind Warning | GGW | 12 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.