Alert archive / Montana / Glacier County
Weather alerts in Glacier County, Montana, 2019
39 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 39
- Warnings
- 11
- Watches
- 4
- Advisories
- 1
- Busiest month
- June10 alerts
- Busiest day
- June 14, 20194 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, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 2 | 0% | 4 | 50% | 37 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Great Falls, MT: tornado warnings | 4 | 1 | 75% | 1 | 100% | 2 min |
| NWS Great Falls, MT: severe thunderstorm warnings | 135 | 58 | 57% | 163 | 66% | 18 min |
| NWS Great Falls, MT: flash flood warnings | 3 | 3 | 0% | 5 | 100% | 29 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 |
|---|---|---|---|
| Feb 4, 9:47 AM MST | Special Weather Statement | TFX | 58 min |
| Mar 1, 5:54 AM MST | Special Weather Statement | TFX | 2 hr |
| Apr 28, 1:14 AM MDT | Mesoscale Discussion | SPC | 6 hr |
| May 5, 4:11 AM MDT | Special Weather Statement | TFX | 3 hr |
| May 26, 9:31 AM MDT | Areal Flood Warning | TFX | 3 days |
| May 26, 8:40 PM MDT | Areal Flood Warning | TFX | 3 days |
| Jun 13, 5:20 PM MDT | Special Weather Statement | TFX | 55 min |
| Jun 13, 10:40 PM MDT | Special Weather Statement | TFX | 35 min |
| Jun 14, 11:14 AM MDT | Special Weather Statement | TFX | 46 min |
| Jun 14, 12:08 PM MDT | Severe Thunderstorm Warning | TFX | 37 min |
| Jun 14, 12:44 PM MDT | Severe Thunderstorm Warning | TFX | 46 min |
| Jun 20, 3:27 PM MDT | Special Weather Statement | TFX | 33 min |
| Jun 26, 2:24 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jun 27, 6:57 AM MDT | Special Weather Statement | TFX | 33 min |
| Jun 28, 3:20 PM MDT | Special Weather Statement | TFX | 25 min |
| Jun 28, 4:02 PM MDT | Special Weather Statement | TFX | 28 min |
| Jul 6, 3:52 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 8, 7:52 PM MDT | Areal Flood Advisory | TFX | 3 hr |
| Jul 8, 8:10 PM MDT | Special Weather Statement | TFX | 35 min |
| Jul 8, 8:13 PM MDT | Special Weather Statement | TFX | 32 min |
| Jul 23, 12:46 PM MDT | Fire Weather Watch | TFX | 14 hr |
| Jul 23, 4:13 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 24, 2:39 AM MDT | Red Flag Warning | TFX | 42 hr |
| Jul 25, 2:32 PM MDT | Fire Weather Watch | TFX | 23 hr |
| Jul 26, 1:34 PM MDT | Red Flag Warning | TFX | 31 hr |
| Jul 29, 2:07 PM MDT | Red Flag Warning | TFX | 31 hr |
| Aug 1, 2:50 AM MDT | Fire Weather Watch | TFX | 11 hr |
| Aug 1, 2:15 PM MDT | Red Flag Warning | TFX | 33 hr |
| Aug 1, 2:31 PM MDT | Red Flag Warning | MSO | 32 hr |
| Aug 2, 9:10 PM MDT | Special Weather Statement | TFX | 35 min |
| Aug 3, 4:06 AM MDT | Red Flag Warning | TFX | 16 hr |
| Aug 11, 4:26 PM MDT | Special Weather Statement | TFX | 19 min |
| Aug 11, 4:47 PM MDT | Special Weather Statement | TFX | 13 min |
| Aug 11, 5:01 PM MDT | Special Weather Statement | TFX | 29 min |
| Aug 14, 3:45 PM MDT | Special Weather Statement | TFX | 30 min |
| Aug 14, 6:27 PM MDT | Special Weather Statement | TFX | 48 min |
| Sep 2, 3:03 PM MDT | Fire Weather Watch | TFX | 19 hr |
| Sep 3, 10:08 AM MDT | Red Flag Warning | TFX | 34 hr |
| Sep 28, 8:08 AM MDT | Mesoscale Discussion | SPC | 4 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 | 2 |
| Mesoscale Discussion | 5 |
| Special Weather Statement | 18 |
| Flooding | |
| Areal Flood Warning | 2 |
| Areal Flood Advisory | 1 |
| Fire | |
| Red Flag Warning | 7 |
| Fire Weather Watch | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.