Alert archive / Montana / Chouteau County
Weather alerts in Chouteau County, Montana, 2015
42 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Chouteau County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 42
- Warnings
- 20
- Watches
- 6
- Advisories
- 0
- Busiest month
- July20 alerts
- Busiest day
- July 5, 201514 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 6 tornado warnings covering Chouteau County in 2015 had a tornado report inside them.
Chouteau County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 8 | 2 | 75% | 8 | 63% | 14 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Great Falls, MT: tornado warnings | 6 | 0 | 100% | 0 | ||
| NWS Great Falls, MT: severe thunderstorm warnings | 20 | 6 | 70% | 39 | 26% | 23 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 |
|---|---|---|---|
| Mar 30, 1:00 PM MDT | Red Flag Warning | TFX | 32 hr |
| May 28, 1:27 PM MDT | Special Weather Statement | TFX | 33 min |
| May 30, 2:00 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 5:27 PM MDT | Special Weather Statement | TFX | 48 min |
| Jun 4, 5:49 PM MDT | Severe Thunderstorm Warning | TFX | 26 min |
| Jun 4, 6:12 PM MDT | Severe Thunderstorm Warning | TFX | 33 min |
| Jun 4, 6:42 PM MDT | Special Weather Statement | TFX | 48 min |
| Jun 5, 3:31 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 4:02 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 18, 3:57 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 1, 1:43 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 1, 1:45 PM MDT | Special Weather Statement | TFX | 45 min |
| Jul 1, 2:18 PM MDT | Severe Thunderstorm Warning | TFX | 42 min |
| Jul 1, 2:56 PM MDT | Severe Thunderstorm Warning | TFX | 49 min |
| Jul 4, 9:34 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 4, 9:54 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 10:33 PM MDT | Tornado Warning | TFX | 42 min |
| Jul 4, 10:45 PM MDT | Special Weather Statement | TFX | 45 min |
| Jul 4, 10:49 PM MDT | Special Weather Statement | TFX | 41 min |
| Jul 4, 10:53 PM MDT | Tornado Warning | TFX | 37 min |
| Jul 4, 11:01 PM MDT | Severe Thunderstorm Warning | TFX | 44 min |
| Jul 4, 11:28 PM MDT | Tornado Warning | TFX | 19 min |
| Jul 4, 11:32 PM MDT | Tornado Warning | TFX | 28 min |
| Jul 4, 11:40 PM MDT | Tornado Warning | TFX | 35 min |
| Jul 4, 11:45 PM MDT | Severe Thunderstorm Warning | TFX | 30 min |
| Jul 4, 11:56 PM MDT | Tornado Warning | TFX | 34 min |
| Jul 5, 12:15 AM MDT | Severe Thunderstorm Warning | TFX | 30 min |
| Jul 5, 12:45 AM MDT | Severe Thunderstorm Warning | TFX | 30 min |
| Jul 23, 2:50 PM MDT | Red Flag Warning | TFX | 30 hr |
| Jul 31, 3:17 AM MDT | Fire Weather Watch | TFX | 25 hr |
| Aug 1, 4:32 AM MDT | Red Flag Warning | TFX | 16 hr |
| Aug 13, 3:46 AM MDT | Fire Weather Watch | TFX | 11 hr |
| Aug 13, 2:27 PM MDT | Red Flag Warning | TFX | 55 hr |
| Aug 14, 1:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 14, 2:23 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 14, 7:14 PM MDT | Special Weather Statement | TFX | 46 min |
| Aug 20, 2:46 PM MDT | Red Flag Warning | TFX | 32 hr |
| Aug 29, 5:57 PM MDT | Special Weather Statement | TFX | 48 min |
| Sep 1, 3:16 PM MDT | Red Flag Warning | TFX | 30 hr |
| Sep 24, 3:31 AM MDT | Fire Weather Watch | TFX | 23 hr |
| Dec 11, 5:34 AM MST | Special Weather Statement | TFX | 56 min |
| Dec 22, 2:07 PM MST | Special Weather Statement | TFX | 83 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 | 8 |
| Tornado Warning | 6 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 6 |
| Special Weather Statement | 10 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20142016
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.