Alert archive / Montana / Beaverhead County
Weather alerts in Beaverhead County, Montana, 2010
43 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Beaverhead County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 43
- Warnings
- 4
- Watches
- 6
- Advisories
- 7
- Busiest month
- August18 alerts
- Busiest day
- July 31, 20105 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Beaverhead County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 0 | 100% | 3 | 0% | |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Great Falls, MT: severe thunderstorm warnings | 68 | 40 | 41% | 96 | 67% | 21 min |
| NWS Great Falls, MT: flash flood warnings | 2 | 1 | 50% | 1 | 100% | 106 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 |
|---|---|---|---|
| Jan 12, 11:02 AM MST | Areal Flood Advisory | TFX | 49 hr |
| Jan 14, 1:00 PM MST | Areal Flood Advisory | TFX | 24 hr |
| Jan 15, 1:10 PM MST | Areal Flood Advisory | TFX | 4 days |
| Apr 21, 5:47 PM MDT | Special Weather Statement | TFX | 43 min |
| Jun 10, 7:41 PM MDT | Areal Flood Advisory | TFX | 38 hr |
| Jun 15, 12:27 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 9:24 PM MDT | River Flood Warning | TFX | 3 days |
| Jun 17, 9:51 AM MDT | Areal Flood Advisory | TFX | 9 days |
| Jun 25, 2:23 PM MDT | Areal Flood Advisory | TFX | 19 hr |
| Jun 29, 2:31 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 29, 5:46 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jun 30, 1:28 PM MDT | Mesoscale Discussion | SPC | 62 min |
| Jun 30, 1:58 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 1, 12:45 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jul 1, 1:37 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 1, 2:18 PM MDT | Special Weather Statement | TFX | 42 min |
| Jul 1, 4:57 PM MDT | Mesoscale Discussion | SPC | 63 min |
| Jul 2, 1:03 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jul 31, 12:53 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jul 31, 1:19 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 31, 2:01 PM MDT | Special Weather Statement | TFX | 44 min |
| Jul 31, 4:02 PM MDT | Special Weather Statement | TFX | 43 min |
| Jul 31, 5:02 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jul 31, 6:55 PM MDT | Special Weather Statement | TFX | 35 min |
| Jul 31, 7:01 PM MDT | Severe Thunderstorm Warning | TFX | 25 min |
| Aug 5, 3:57 PM MDT | Special Weather Statement | TFX | 48 min |
| Aug 6, 3:03 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 6, 3:11 PM MDT | Special Weather Statement | TFX | 64 min |
| Aug 6, 6:36 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Aug 7, 1:41 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 1:47 PM MDT | Special Weather Statement | TFX | 43 min |
| Aug 10, 1:40 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 4:57 PM MDT | Special Weather Statement | TFX | 63 min |
| Aug 10, 5:36 PM MDT | Special Weather Statement | TFX | 39 min |
| Aug 20, 12:00 PM MDT | Red Flag Warning | MSO | 33 hr |
| Aug 24, 1:57 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 25, 2:14 PM MDT | Red Flag Warning | MSO | 34 hr |
| Aug 26, 5:52 PM MDT | Special Weather Statement | TFX | 38 min |
| Aug 26, 5:55 PM MDT | Special Weather Statement | TFX | 35 min |
| Aug 28, 1:35 PM MDT | Special Weather Statement | TFX | 55 min |
| Aug 30, 12:06 PM MDT | Areal Flood Advisory | TFX | 9 hr |
| Sep 4, 1:11 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Sep 14, 3:49 PM MDT | Mesoscale Discussion | SPC | 56 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 | 1 |
| Severe Thunderstorm Watch | 5 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 13 |
| Flooding | |
| River Flood Warning | 1 |
| Areal Flood Advisory | 7 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.