Alert archive / Montana / Prairie County
Weather alerts in Prairie County, Montana, 2009
86 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 86
- Warnings
- 28
- Watches
- 18
- Advisories
- 20
- Busiest month
- July19 alerts
- Busiest day
- July 8, 20095 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, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 8 | 38% | 7 | 100% | 23 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 Glasgow, MT: tornado warnings | 18 | 2 | 89% | 7 | 43% | 13 min |
| NWS Glasgow, MT: severe thunderstorm warnings | 105 | 58 | 45% | 157 | 68% | 27 min |
| NWS Glasgow, MT: flash flood warnings | 4 | 0 | 100% | 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 1, 9:24 PM MST | Winter Weather Advisory | GGW | 37 hr |
| Jan 2, 3:24 PM MST | Wind Chill Advisory | GGW | 5 hr |
| Jan 3, 3:55 AM MST | Wind Chill Advisory | GGW | 15 hr |
| Jan 6, 3:03 PM MST | Winter Weather Advisory | GGW | 24 hr |
| Jan 8, 3:18 AM MST | Freezing Rain Advisory | GGW | 7 hr |
| Jan 8, 10:28 AM MST | Ice Storm Warning | GGW | 11 hr |
| Jan 8, 3:04 PM MST | Winter Weather Advisory | GGW | 20 hr |
| Jan 10, 2:45 PM MST | High Wind Watch | GGW | 24 hr |
| Jan 11, 3:01 PM MST | High Wind Warning | GGW | 19 hr |
| Jan 13, 5:41 PM MST | High Wind Warning | GGW | 3 hr |
| Jan 31, 4:02 AM MST | High Wind Warning | GGW | 8 hr |
| Feb 23, 2:57 PM MST | Freezing Rain Advisory | GGW | 19 hr |
| Feb 24, 4:55 AM MST | Mesoscale Discussion | SPC | 5 hr |
| Feb 25, 3:22 AM MST | Winter Weather Advisory | GGW | 56 hr |
| Mar 8, 12:53 PM MDT | Winter Weather Advisory | GGW | 9 hr |
| Mar 9, 3:10 AM MDT | Wind Chill Advisory | GGW | 31 hr |
| Mar 27, 3:10 PM MDT | Winter Storm Watch | GGW | 24 hr |
| Mar 28, 3:16 PM MDT | Winter Storm Warning | GGW | 37 hr |
| Mar 28, 3:16 PM MDT | Winter Weather Advisory | GGW | 37 hr |
| Mar 29, 2:40 AM MDT | Blizzard Warning | GGW | 33 hr |
| Apr 22, 8:05 AM MDT | Red Flag Warning | GGW | 12 hr |
| Jun 25, 3:50 AM MDT | Red Flag Warning | GGW | 17 hr |
| Jun 30, 3:19 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 4:14 PM MDT | Severe Thunderstorm Warning | GGW | 46 min |
| Jul 2, 11:25 AM MDT | Mesoscale Discussion | SPC | 65 min |
| Jul 2, 11:41 AM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 2, 2:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 2, 6:29 PM MDT | Mesoscale Discussion | SPC | 61 min |
| Jul 5, 7:37 PM MDT | Severe Thunderstorm Warning | GGW | 53 min |
| Jul 6, 7:23 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 6, 9:36 PM MDT | Severe Thunderstorm Warning | GGW | 54 min |
| Jul 6, 10:28 PM MDT | Severe Thunderstorm Warning | GGW | 47 min |
| Jul 6, 10:30 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jul 8, 1:30 AM MDT | Special Weather Statement | BYZ | 60 min |
| Jul 8, 10:38 AM MDT | Mesoscale Discussion | SPC | 97 min |
| Jul 8, 1:02 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 8, 2:20 PM MDT | Tornado Watch | SPC | 8 hr |
| Jul 8, 5:46 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jul 13, 12:10 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jul 13, 5:05 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 13, 6:11 PM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 22, 2:52 PM MDT | Fire Weather Watch | GGW | 13 hr |
| Jul 23, 3:57 AM MDT | Red Flag Warning | GGW | 17 hr |
| Aug 4, 6:45 AM MDT | Special Weather Statement | BYZ | 60 min |
| Aug 7, 12:12 AM MDT | Special Weather Statement | BYZ | 48 min |
| Aug 7, 8:46 PM MDT | Severe Thunderstorm Warning | GGW | 37 min |
| Aug 7, 9:41 PM MDT | Special Weather Statement | BYZ | 49 min |
| Aug 13, 10:51 PM MDT | Severe Thunderstorm Warning | GGW | 54 min |
| Aug 13, 11:47 PM MDT | Severe Thunderstorm Warning | GGW | 58 min |
| Aug 14, 5:10 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Aug 14, 8:00 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 14, 10:46 PM MDT | Severe Thunderstorm Warning | GGW | 49 min |
| Aug 14, 10:47 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Aug 23, 7:02 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Aug 23, 7:55 PM MDT | Tornado Watch | SPC | 5 hr |
| Sep 5, 3:36 AM MDT | Fire Weather Watch | GGW | 24 hr |
| Sep 6, 3:52 AM MDT | Red Flag Warning | GGW | 18 hr |
| Sep 8, 2:44 PM MDT | Red Flag Warning | GGW | 28 hr |
| Sep 13, 1:44 PM MDT | Mesoscale Discussion | SPC | 61 min |
| Sep 13, 2:35 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 13, 4:40 PM MDT | Special Weather Statement | BYZ | 65 min |
| Sep 13, 5:28 PM MDT | Severe Thunderstorm Warning | GGW | 62 min |
| Sep 13, 6:12 PM MDT | Severe Thunderstorm Warning | GGW | 63 min |
| Sep 13, 6:29 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Sep 13, 7:04 PM MDT | Severe Thunderstorm Warning | GGW | 56 min |
| Sep 13, 7:08 PM MDT | Severe Thunderstorm Warning | GGW | 52 min |
| Sep 13, 8:53 PM MDT | Severe Thunderstorm Warning | GGW | 67 min |
| Sep 18, 4:05 AM MDT | Fire Weather Watch | GGW | 23 hr |
| Sep 19, 3:31 AM MDT | Red Flag Warning | GGW | 20 hr |
| Sep 24, 8:05 PM MDT | Fire Weather Watch | GGW | 19 hr |
| Sep 25, 3:00 PM MDT | Red Flag Warning | GGW | 30 hr |
| Sep 27, 3:46 AM MDT | Red Flag Warning | GGW | 17 hr |
| Sep 29, 4:06 AM MDT | Red Flag Warning | GGW | 16 hr |
| Oct 3, 2:54 PM MDT | Winter Storm Watch | GGW | 24 hr |
| Oct 4, 2:48 PM MDT | Winter Weather Advisory | GGW | 36 hr |
| Dec 9, 2:55 PM MST | Wind Chill Advisory | GGW | 18 hr |
| Dec 11, 3:06 PM MST | Winter Storm Watch | GGW | 13 hr |
| Dec 12, 4:19 AM MST | Winter Weather Advisory | GGW | 37 hr |
| Dec 14, 4:25 PM MST | Wind Chill Advisory | GGW | 12 hr |
| Dec 20, 7:52 AM MST | Dense Fog Advisory | GGW | 13 hr |
| Dec 20, 3:51 PM MST | Winter Weather Advisory | GGW | 22 hr |
| Dec 22, 3:44 AM MST | Winter Storm Watch | GGW | 23 hr |
| Dec 22, 3:05 PM MST | Blizzard Watch | GGW | 12 hr |
| Dec 23, 3:01 AM MST | Winter Weather Advisory | GGW | 17 hr |
| Dec 23, 3:14 PM MST | Wind Chill Advisory | GGW | 68 hr |
| Dec 24, 3:22 PM MST | Winter Weather Advisory | GGW | 49 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 | 13 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 15 |
| Special Weather Statement | 5 |
| Winter | |
| Blizzard Warning | 1 |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 1 |
| Blizzard Watch | 1 |
| Winter Storm Watch | 4 |
| Freezing Rain Advisory | 2 |
| Winter Weather Advisory | 11 |
| Cold | |
| Wind Chill Advisory | 6 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
| Fire | |
| Red Flag Warning | 9 |
| Fire Weather Watch | 4 |
| 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.