Alert archive / Montana / Teton County
Weather alerts in Teton County, Montana, 2018
56 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Teton County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 56
- Warnings
- 17
- Watches
- 5
- Advisories
- 5
- Busiest month
- June15 alerts
- Busiest day
- June 9, 20187 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Teton County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 4 | 43% | 7 | 100% | 22 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Great Falls, MT: tornado warnings | 0 | 3 | 0% | |||
| NWS Great Falls, MT: severe thunderstorm warnings | 51 | 16 | 69% | 67 | 45% | 21 min |
| NWS Great Falls, MT: flash flood warnings | 9 | 1 | 89% | 6 | 17% | 129 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 3, 8:03 PM MST | Special Weather Statement | TFX | 117 min |
| Feb 3, 10:08 PM MST | Special Weather Statement | TFX | 112 min |
| Feb 8, 10:20 PM MST | Special Weather Statement | TFX | 25 min |
| Feb 8, 10:57 PM MST | Special Weather Statement | TFX | 48 min |
| Feb 10, 5:45 PM MST | Special Weather Statement | TFX | 3 hr |
| Feb 10, 5:50 PM MST | Special Weather Statement | TFX | 3 hr |
| Feb 10, 8:48 PM MST | Special Weather Statement | TFX | 3 hr |
| Mar 2, 5:34 PM MST | Special Weather Statement | TFX | 56 min |
| Mar 9, 8:35 PM MST | Special Weather Statement | TFX | 85 min |
| Mar 24, 11:19 PM MDT | Areal Flood Advisory | TFX | 36 hr |
| Mar 28, 6:41 PM MDT | Areal Flood Advisory | TFX | 63 hr |
| Mar 30, 5:32 PM MDT | Special Weather Statement | TFX | 58 min |
| Apr 12, 12:14 PM MDT | Areal Flood Advisory | TFX | 4 days |
| Apr 12, 1:49 PM MDT | Special Weather Statement | TFX | 56 min |
| Apr 17, 8:15 AM MDT | Areal Flood Advisory | TFX | 48 hr |
| May 6, 8:25 PM MDT | Special Weather Statement | TFX | 65 min |
| May 16, 11:31 AM MDT | Areal Flood Warning | TFX | 46 hr |
| May 16, 5:57 PM MDT | Special Weather Statement | TFX | 33 min |
| Jun 7, 4:09 PM MDT | Special Weather Statement | TFX | 36 min |
| Jun 9, 1:06 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 9, 1:46 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 9, 2:25 PM MDT | Special Weather Statement | TFX | 35 min |
| Jun 9, 2:37 PM MDT | Severe Thunderstorm Warning | TFX | 23 min |
| Jun 9, 3:03 PM MDT | Special Weather Statement | TFX | 27 min |
| Jun 9, 3:31 PM MDT | Special Weather Statement | TFX | 14 min |
| Jun 9, 4:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 18, 10:55 PM MDT | Areal Flood Warning | TFX | 36 hr |
| Jun 20, 12:36 PM MDT | Areal Flood Warning | TFX | 4 days |
| Jun 23, 4:47 PM MDT | Areal Flood Advisory | TFX | 3 hr |
| Jun 25, 5:29 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 25, 7:04 PM MDT | Severe Thunderstorm Warning | TFX | 26 min |
| Jun 25, 7:17 PM MDT | Severe Thunderstorm Warning | TFX | 28 min |
| Jun 25, 8:49 PM MDT | Severe Thunderstorm Warning | TFX | 26 min |
| Jul 16, 2:05 PM MDT | Fire Weather Watch | TFX | 24 hr |
| Jul 17, 2:01 PM MDT | Red Flag Warning | TFX | 31 hr |
| Jul 19, 3:17 AM MDT | Fire Weather Watch | TFX | 24 hr |
| Jul 20, 3:40 AM MDT | Red Flag Warning | TFX | 19 hr |
| Jul 20, 2:00 PM MDT | Red Flag Warning | TFX | 34 hr |
| Jul 25, 7:46 PM MDT | Severe Thunderstorm Warning | TFX | 59 min |
| Jul 25, 8:44 PM MDT | Severe Thunderstorm Warning | TFX | 61 min |
| Jul 25, 9:45 PM MDT | Severe Thunderstorm Warning | TFX | 60 min |
| Jul 25, 9:50 PM MDT | Special Weather Statement | TFX | 40 min |
| Jul 26, 1:10 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 1, 11:03 AM MDT | Red Flag Warning | TFX | 59 hr |
| Aug 3, 5:26 PM MDT | Special Weather Statement | TFX | 19 min |
| Aug 5, 3:56 PM MDT | Special Weather Statement | TFX | 19 min |
| Aug 5, 4:26 PM MDT | Special Weather Statement | TFX | 34 min |
| Aug 8, 3:25 AM MDT | Fire Weather Watch | TFX | 36 hr |
| Aug 9, 3:02 PM MDT | Red Flag Warning | TFX | 3 days |
| Aug 15, 2:19 PM MDT | Fire Weather Watch | TFX | 25 hr |
| Aug 16, 3:01 PM MDT | Red Flag Warning | TFX | 33 hr |
| Aug 17, 7:58 PM MDT | Special Weather Statement | TFX | 62 min |
| Aug 23, 8:30 AM MDT | Red Flag Warning | TFX | 12 hr |
| Nov 2, 5:52 PM MDT | Special Weather Statement | TFX | 23 min |
| Nov 2, 6:32 PM MDT | Special Weather Statement | TFX | 58 min |
| Nov 6, 4:12 AM MST | Special Weather Statement | TFX | 93 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 | 7 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 4 |
| Special Weather Statement | 25 |
| Flooding | |
| Areal Flood Warning | 3 |
| Areal Flood Advisory | 5 |
| 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 archive20172019
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.