Alert archive / Montana / Glacier County
Weather alerts in Glacier County, Montana, 2012
70 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Glacier County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 70
- Warnings
- 31
- Watches
- 19
- Advisories
- 1
- Busiest month
- June23 alerts
- Busiest day
- June 5, 20128 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Glacier County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 14 | 5 | 64% | 15 | 27% | 14 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 Great Falls, MT: tornado warnings | 10 | 3 | 70% | 4 | 100% | 13 min |
| NWS Great Falls, MT: severe thunderstorm warnings | 74 | 40 | 46% | 153 | 56% | 25 min |
| NWS Great Falls, MT: flash flood warnings | 1 | 0 | 100% | 1 | 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, 7:37 PM MST | Red Flag Warning | TFX | 19 hr |
| Mar 8, 2:01 PM MST | Fire Weather Watch | TFX | 14 hr |
| Mar 9, 3:46 AM MST | Red Flag Warning | TFX | 18 hr |
| Mar 10, 12:06 PM MST | Red Flag Warning | TFX | 8 hr |
| Mar 12, 2:49 PM MDT | Fire Weather Watch | TFX | 13 hr |
| Mar 13, 4:16 AM MDT | Red Flag Warning | TFX | 23 hr |
| Mar 15, 3:23 AM MDT | Fire Weather Watch | TFX | 24 hr |
| Apr 26, 1:44 PM MDT | Areal Flood Advisory | TFX | 45 hr |
| Jun 4, 2:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jun 4, 4:32 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 4, 6:02 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 4, 10:07 PM MDT | Severe Thunderstorm Warning | TFX | 38 min |
| Jun 4, 10:41 PM MDT | Severe Thunderstorm Warning | TFX | 49 min |
| Jun 4, 10:44 PM MDT | Severe Thunderstorm Warning | TFX | 61 min |
| Jun 4, 11:47 PM MDT | Severe Thunderstorm Warning | TFX | 73 min |
| Jun 5, 1:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 2:37 PM MDT | Tornado Watch | SPC | 8 hr |
| Jun 5, 4:48 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jun 23, 2:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jun 23, 6:25 PM MDT | Severe Thunderstorm Warning | TFX | 40 min |
| Jun 25, 3:35 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 25, 4:01 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 25, 5:38 PM MDT | Severe Thunderstorm Warning | TFX | 52 min |
| Jun 25, 6:22 PM MDT | Severe Thunderstorm Warning | TFX | 38 min |
| Jun 25, 6:31 PM MDT | Severe Thunderstorm Warning | TFX | 44 min |
| Jun 26, 3:06 AM MDT | Severe Thunderstorm Warning | TFX | 39 min |
| Jun 26, 6:16 AM MDT | Mesoscale Discussion | SPC | 89 min |
| Jun 26, 11:08 AM MDT | Mesoscale Discussion | SPC | 37 min |
| Jun 26, 11:16 AM MDT | Severe Thunderstorm Warning | TFX | 59 min |
| Jun 26, 11:20 AM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 26, 12:08 PM MDT | Severe Thunderstorm Warning | TFX | 67 min |
| Jul 1, 5:53 PM MDT | Special Weather Statement | TFX | 52 min |
| Jul 1, 6:43 PM MDT | Special Weather Statement | TFX | 62 min |
| Jul 20, 2:58 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jul 20, 5:32 PM MDT | Special Weather Statement | TFX | 58 min |
| Jul 22, 4:43 AM MDT | Fire Weather Watch | TFX | 23 hr |
| Jul 22, 5:06 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jul 22, 11:38 PM MDT | Special Weather Statement | TFX | 52 min |
| Jul 23, 3:45 AM MDT | Red Flag Warning | TFX | 40 hr |
| Jul 26, 2:07 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 26, 7:37 PM MDT | Severe Thunderstorm Warning | TFX | 53 min |
| Jul 26, 8:24 PM MDT | Severe Thunderstorm Warning | TFX | 66 min |
| Jul 27, 10:50 PM MDT | Special Weather Statement | TFX | 40 min |
| Jul 27, 11:34 PM MDT | Special Weather Statement | TFX | 56 min |
| Jul 31, 2:55 PM MDT | Fire Weather Watch | TFX | 24 hr |
| Aug 5, 2:44 PM MDT | Fire Weather Watch | MSO | 14 hr |
| Aug 5, 2:44 PM MDT | Red Flag Warning | MSO | 29 hr |
| Aug 5, 4:23 PM MDT | Fire Weather Watch | TFX | 11 hr |
| Aug 7, 8:23 AM MDT | Red Flag Warning | TFX | 13 hr |
| Aug 13, 2:40 PM MDT | Red Flag Warning | TFX | 34 hr |
| Aug 14, 6:42 PM MDT | Severe Thunderstorm Warning | TFX | 78 min |
| Aug 20, 5:49 PM MDT | Special Weather Statement | TFX | 26 min |
| Aug 20, 5:52 PM MDT | Special Weather Statement | TFX | 23 min |
| Aug 22, 2:04 PM MDT | Fire Weather Watch | TFX | 15 hr |
| Aug 23, 5:25 AM MDT | Red Flag Warning | TFX | 40 hr |
| Aug 27, 4:05 AM MDT | Fire Weather Watch | TFX | 23 hr |
| Aug 28, 3:27 AM MDT | Red Flag Warning | TFX | 42 hr |
| Aug 31, 3:37 AM MDT | Fire Weather Watch | TFX | 11 hr |
| Aug 31, 2:20 PM MDT | Fire Weather Watch | MSO | 13 hr |
| Aug 31, 2:49 PM MDT | Red Flag Warning | TFX | 3 days |
| Sep 1, 3:29 AM MDT | Red Flag Warning | MSO | 19 hr |
| Sep 7, 4:01 AM MDT | Fire Weather Watch | TFX | 11 hr |
| Sep 7, 3:04 PM MDT | Red Flag Warning | TFX | 4 days |
| Sep 12, 1:31 PM MDT | Fire Weather Watch | TFX | 24 hr |
| Sep 13, 1:25 PM MDT | Red Flag Warning | TFX | 32 hr |
| Sep 18, 2:34 PM MDT | Red Flag Warning | TFX | 5 hr |
| Sep 30, 3:57 AM MDT | Fire Weather Watch | TFX | 25 hr |
| Sep 30, 11:15 AM MDT | Red Flag Warning | MSO | 35 hr |
| Sep 30, 2:44 PM MDT | Red Flag Warning | TFX | 48 hr |
| Oct 2, 3:39 PM MDT | Special Weather Statement | TFX | 51 min |
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 | 14 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 10 |
| Special Weather Statement | 9 |
| Flooding | |
| Areal Flood Advisory | 1 |
| Fire | |
| Red Flag Warning | 17 |
| Fire Weather Watch | 14 |
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.