Alert archive / Montana / Prairie County
Weather alerts in Prairie County, Montana, 2017
77 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 77
- Warnings
- 22
- Watches
- 11
- Advisories
- 26
- Busiest month
- July24 alerts
- Busiest day
- June 28, 20173 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, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 1 | 86% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: tornado warnings | 0 | 1 | 0% | |||
| NWS Glasgow, MT: severe thunderstorm warnings | 42 | 12 | 71% | 43 | 42% | 22 min |
| NWS Glasgow, MT: flash flood warnings | 1 | 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 2, 11:30 AM MST | Wind Chill Advisory | GGW | 71 hr |
| Jan 3, 2:15 PM MST | Winter Weather Advisory | GGW | 24 hr |
| Jan 7, 2:31 PM MST | Winter Storm Watch | GGW | 267 days |
| Jan 8, 2:21 PM MST | Winter Weather Advisory | GGW | 29 hr |
| Jan 10, 2:50 AM MST | Wind Chill Advisory | GGW | 57 hr |
| Jan 12, 2:14 PM MST | Wind Chill Advisory | GGW | 19 hr |
| Jan 21, 7:54 AM MST | Freezing Fog Advisory | GGW | 3 hr |
| Jan 23, 11:42 AM MST | Freezing Rain Advisory | GGW | 8 hr |
| Feb 5, 3:25 AM MST | Winter Weather Advisory | GGW | 48 hr |
| Feb 7, 2:05 PM MST | Wind Chill Advisory | GGW | 23 hr |
| Feb 19, 3:26 AM MST | Flood Watch | GGW | 8 days |
| Mar 5, 2:50 AM MST | Winter Weather Advisory | GGW | 35 hr |
| Mar 7, 9:38 AM MST | Winter Weather Advisory | GGW | 8 hr |
| Mar 8, 3:30 AM MST | Winter Storm Watch | GGW | 24 hr |
| Mar 9, 3:50 AM MST | Winter Weather Advisory | GGW | 47 hr |
| May 15, 3:07 PM MDT | Mesoscale Discussion | SPC | 113 min |
| May 15, 6:34 PM MDT | Mesoscale Discussion | SPC | 56 min |
| May 21, 3:15 PM MDT | Special Weather Statement | GGW | 60 min |
| May 21, 4:27 PM MDT | Special Weather Statement | GGW | 63 min |
| May 28, 2:48 AM MDT | Red Flag Warning | GGW | 18 hr |
| Jun 9, 7:37 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 6:58 PM MDT | Severe Thunderstorm Warning | GGW | 47 min |
| Jun 13, 7:13 PM MDT | Special Weather Statement | GGW | 47 min |
| Jun 27, 4:51 PM MDT | Severe Thunderstorm Warning | GGW | 54 min |
| Jun 28, 2:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 2:38 PM MDT | Special Weather Statement | GGW | 37 min |
| Jun 28, 3:15 PM MDT | Severe Thunderstorm Warning | GGW | 60 min |
| Jul 4, 7:04 PM MDT | Red Flag Warning | GGW | 25 hr |
| Jul 7, 10:38 AM MDT | Heat Advisory | GGW | 31 hr |
| Jul 8, 2:39 PM MDT | Heat Advisory | GGW | 30 hr |
| Jul 10, 3:20 AM MDT | Red Flag Warning | GGW | 18 hr |
| Jul 10, 4:47 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 10, 7:32 PM MDT | Severe Thunderstorm Warning | GGW | 35 min |
| Jul 13, 3:04 PM MDT | Red Flag Warning | GGW | 30 hr |
| Jul 13, 3:04 PM MDT | Red Flag Warning | GGW | 3 days |
| Jul 13, 3:04 PM MDT | Heat Advisory | GGW | 30 hr |
| Jul 14, 2:41 PM MDT | Heat Advisory | GGW | 54 hr |
| Jul 14, 2:43 PM MDT | Fire Weather Watch | GGW | 24 hr |
| Jul 16, 2:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jul 16, 6:30 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 6:46 PM MDT | Special Weather Statement | GGW | 59 min |
| Jul 16, 7:38 PM MDT | Special Weather Statement | GGW | 52 min |
| Jul 18, 2:22 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 1:36 AM MDT | Mesoscale Discussion | SPC | 114 min |
| Jul 19, 4:04 AM MDT | Severe Thunderstorm Warning | GGW | 26 min |
| Jul 19, 5:44 AM MDT | Severe Thunderstorm Warning | GGW | 34 min |
| Jul 20, 2:32 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Jul 20, 2:39 PM MDT | Red Flag Warning | GGW | 54 hr |
| Jul 20, 2:50 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 22, 9:09 PM MDT | Red Flag Warning | GGW | 58 hr |
| Jul 23, 3:09 AM MDT | Fire Weather Watch | GGW | 11 hr |
| Aug 12, 2:32 PM MDT | Special Weather Statement | GGW | 58 min |
| Aug 12, 3:05 PM MDT | Severe Thunderstorm Warning | GGW | 23 min |
| Aug 12, 4:06 PM MDT | Special Weather Statement | GGW | 54 min |
| Aug 16, 3:05 AM MDT | Fire Weather Watch | GGW | 11 hr |
| Aug 16, 2:14 PM MDT | Red Flag Warning | GGW | 31 hr |
| Aug 18, 2:49 PM MDT | Red Flag Warning | GGW | 28 hr |
| Aug 29, 2:52 PM MDT | Fire Weather Watch | GGW | 37 hr |
| Aug 30, 3:44 AM MDT | Red Flag Warning | GGW | 41 hr |
| Sep 1, 3:09 PM MDT | Fire Weather Watch | GGW | 24 hr |
| Sep 2, 2:52 PM MDT | Red Flag Warning | GGW | 54 hr |
| Sep 7, 2:24 PM MDT | Red Flag Warning | GGW | 29 hr |
| Sep 12, 3:49 PM MDT | Dense Smoke Advisory | GGW | 12 hr |
| Oct 21, 1:41 PM MDT | High Wind Warning | GGW | 32 hr |
| Oct 23, 3:00 PM MDT | Fire Weather Watch | GGW | 24 hr |
| Oct 24, 2:49 PM MDT | Red Flag Warning | GGW | 32 hr |
| Nov 2, 2:41 PM MDT | Winter Weather Advisory | GGW | 45 hr |
| Nov 11, 2:50 PM MST | Dense Fog Advisory | GGW | 20 hr |
| Nov 12, 5:25 PM MST | Dense Fog Advisory | GGW | 18 hr |
| Nov 28, 2:20 PM MST | High Wind Watch | GGW | 13 hr |
| Nov 29, 3:39 AM MST | High Wind Warning | GGW | 12 hr |
| Dec 18, 2:35 PM MST | Winter Weather Advisory | GGW | 55 hr |
| Dec 24, 3:02 AM MST | Wind Chill Advisory | GGW | 3 days |
| Dec 27, 1:22 PM MST | Wind Chill Advisory | GGW | 20 hr |
| Dec 28, 3:55 AM MST | Winter Weather Advisory | GGW | 61 hr |
| Dec 28, 9:49 AM MST | Wind Chill Advisory | GGW | 31 hr |
| Dec 30, 2:16 PM MST | Wind Chill Advisory | GGW | 67 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 | 7 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 10 |
| Special Weather Statement | 8 |
| Flooding | |
| Flood Watch | 1 |
| Winter | |
| Winter Storm Watch | 2 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Wind Chill Advisory | 8 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 1 |
| Fire | |
| Red Flag Warning | 13 |
| Fire Weather Watch | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
| Dense Smoke Advisory | 1 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.