Alert archive / Montana / Powell County
Weather alerts in Powell County, Montana, 2017
165 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Powell County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 165
- Warnings
- 47
- Watches
- 19
- Advisories
- 61
- Busiest month
- July27 alerts
- Busiest day
- June 8, 20178 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Powell County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 1 | 80% | 3 | 33% | 8 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: tornado warnings | 0 | 1 | 0% | |||
| NWS Missoula, MT: severe thunderstorm warnings | 13 | 8 | 38% | 24 | 38% | 20 min |
| NWS Missoula, MT: flash flood warnings | 0 | 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 1, 4:57 AM MST | Winter Storm Warning | MSO | 14 hr |
| Jan 2, 3:41 AM MST | Wind Chill Warning | MSO | 31 hr |
| Jan 7, 2:35 PM MST | Winter Storm Watch | MSO | 59 days |
| Jan 7, 2:35 PM MST | Winter Weather Advisory | MSO | 50 hr |
| Jan 7, 11:27 PM MST | Winter Storm Warning | MSO | 42 hr |
| Jan 8, 3:35 AM MST | Winter Weather Advisory | MSO | 37 hr |
| Jan 10, 1:31 PM MST | Wind Chill Advisory | MSO | 21 hr |
| Jan 10, 1:31 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Jan 17, 1:42 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Jan 18, 9:09 PM MST | Freezing Rain Advisory | MSO | 14 hr |
| Jan 19, 11:24 PM MST | Dense Fog Advisory | MSO | 12 hr |
| Jan 20, 9:45 PM MST | Freezing Fog Advisory | MSO | 11 hr |
| Jan 21, 1:59 PM MST | Winter Weather Advisory | MSO | 43 hr |
| Jan 29, 2:29 PM MST | Winter Storm Watch | MSO | 39 days |
| Jan 30, 12:07 PM MST | Winter Storm Warning | MSO | 40 hr |
| Jan 31, 6:04 AM MST | Winter Weather Advisory | MSO | 29 hr |
| Feb 1, 2:36 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Feb 2, 1:54 PM MST | Winter Weather Advisory | MSO | 69 hr |
| Feb 3, 1:27 PM MST | Winter Storm Watch | MSO | 14 hr |
| Feb 4, 3:09 AM MST | Winter Storm Warning | MSO | 59 hr |
| Feb 6, 11:09 AM MST | Winter Weather Advisory | MSO | 21 hr |
| Feb 6, 4:42 PM MST | Special Weather Statement | MSO | 93 min |
| Feb 7, 9:24 AM MST | Winter Weather Advisory | MSO | 24 hr |
| Feb 8, 11:42 AM MST | Winter Weather Advisory | MSO | 23 hr |
| Feb 10, 10:18 PM MST | Winter Weather Advisory | MSO | 12 hr |
| Feb 23, 5:10 AM MST | Winter Weather Advisory | MSO | 4 hr |
| Feb 25, 1:58 PM MST | Winter Weather Advisory | MSO | 46 hr |
| Feb 27, 2:39 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Feb 28, 2:14 PM MST | Wind Advisory | MSO | 30 hr |
| Feb 28, 2:17 PM MST | Winter Weather Advisory | MSO | 46 hr |
| Mar 4, 1:37 PM MST | Winter Storm Warning | MSO | 31 hr |
| Mar 4, 1:37 PM MST | Winter Weather Advisory | MSO | 30 hr |
| Mar 5, 8:57 PM MST | Winter Weather Advisory | MSO | 4 hr |
| Mar 6, 2:54 PM MST | Winter Weather Advisory | MSO | 19 hr |
| Mar 7, 12:36 AM MST | Special Weather Statement | MSO | 84 min |
| Mar 7, 2:42 PM MST | Winter Storm Warning | MSO | 20 hr |
| Mar 7, 2:42 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Mar 8, 2:04 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Mar 9, 7:54 AM MST | Winter Storm Warning | MSO | 5 hr |
| Mar 9, 3:06 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Mar 29, 2:26 PM MDT | Winter Weather Advisory | MSO | 41 hr |
| Apr 7, 9:35 PM MDT | Winter Weather Advisory | MSO | 38 hr |
| Apr 13, 2:43 PM MDT | Winter Weather Advisory | MSO | 33 hr |
| May 6, 3:16 PM MDT | Severe Thunderstorm Warning | MSO | 29 min |
| May 6, 3:41 PM MDT | Severe Thunderstorm Warning | MSO | 34 min |
| May 6, 3:42 PM MDT | Mesoscale Discussion | SPC | 63 min |
| May 12, 1:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 12, 2:45 PM MDT | Special Weather Statement | MSO | 45 min |
| May 15, 12:54 PM MDT | Winter Storm Watch | MSO | 24 hr |
| May 16, 1:14 PM MDT | Winter Storm Warning | MSO | 38 hr |
| May 16, 6:49 PM MDT | Special Weather Statement | MSO | 26 min |
| May 23, 9:54 AM MDT | High Wind Watch | MSO | 17 hr |
| May 23, 9:54 AM MDT | Wind Advisory | MSO | 35 hr |
| May 31, 4:49 PM MDT | Special Weather Statement | MSO | 41 min |
| Jun 1, 12:42 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 1, 3:08 PM MDT | Special Weather Statement | MSO | 52 min |
| Jun 1, 3:59 PM MDT | Special Weather Statement | MSO | 46 min |
| Jun 4, 3:28 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 4, 4:24 PM MDT | Special Weather Statement | MSO | 36 min |
| Jun 4, 4:25 PM MDT | Special Weather Statement | MSO | 35 min |
| Jun 4, 4:49 PM MDT | Special Weather Statement | MSO | 26 min |
| Jun 4, 5:11 PM MDT | Special Weather Statement | MSO | 49 min |
| Jun 8, 4:24 PM MDT | Special Weather Statement | MSO | 51 min |
| Jun 8, 4:24 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jun 8, 4:28 PM MDT | Special Weather Statement | MSO | 17 min |
| Jun 8, 4:37 PM MDT | Severe Thunderstorm Warning | MSO | 23 min |
| Jun 8, 4:46 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 8, 4:57 PM MDT | Severe Thunderstorm Warning | MSO | 33 min |
| Jun 8, 5:15 PM MDT | Special Weather Statement | MSO | 45 min |
| Jun 8, 5:18 PM MDT | Special Weather Statement | TFX | 27 min |
| Jun 10, 2:03 PM MDT | Flood Watch | MSO | 3 days |
| Jun 12, 7:36 PM MDT | Areal Flood Advisory | MSO | 24 hr |
| Jun 13, 10:45 AM MDT | Areal Flood Advisory | MSO | 9 hr |
| Jun 13, 7:54 PM MDT | Flood Watch | MSO | 10 hr |
| Jun 26, 8:19 PM MDT | Special Weather Statement | MSO | 41 min |
| Jun 26, 9:17 PM MDT | Special Weather Statement | MSO | 28 min |
| Jul 4, 9:41 PM MDT | Red Flag Warning | TFX | 23 hr |
| Jul 5, 8:47 PM MDT | Special Weather Statement | MSO | 28 min |
| Jul 9, 5:49 PM MDT | Special Weather Statement | MSO | 26 min |
| Jul 9, 6:14 PM MDT | Special Weather Statement | MSO | 46 min |
| Jul 9, 6:46 PM MDT | Special Weather Statement | MSO | 44 min |
| Jul 10, 4:16 PM MDT | Severe Thunderstorm Warning | MSO | 29 min |
| Jul 10, 5:38 PM MDT | Special Weather Statement | MSO | 37 min |
| Jul 10, 6:58 PM MDT | Special Weather Statement | MSO | 47 min |
| Jul 10, 7:25 PM MDT | Special Weather Statement | MSO | 20 min |
| Jul 10, 7:44 PM MDT | Special Weather Statement | MSO | 16 min |
| Jul 13, 6:13 PM MDT | Special Weather Statement | MSO | 32 min |
| Jul 13, 6:47 PM MDT | Special Weather Statement | MSO | 28 min |
| Jul 13, 6:48 PM MDT | Special Weather Statement | MSO | 27 min |
| Jul 14, 2:46 PM MDT | Red Flag Warning | TFX | 54 hr |
| Jul 15, 2:00 PM MDT | Red Flag Warning | MSO | 31 hr |
| Jul 15, 2:07 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jul 15, 5:53 PM MDT | Special Weather Statement | MSO | 52 min |
| Jul 18, 10:53 PM MDT | Special Weather Statement | MSO | 37 min |
| Jul 18, 11:29 PM MDT | Special Weather Statement | MSO | 16 min |
| Jul 19, 2:14 PM MDT | Red Flag Warning | MSO | 31 hr |
| Jul 20, 3:05 AM MDT | Red Flag Warning | TFX | 42 hr |
| Jul 22, 2:56 PM MDT | Red Flag Warning | TFX | 30 hr |
| Jul 23, 4:36 AM MDT | Fire Weather Watch | TFX | 22 hr |
| Jul 23, 2:39 PM MDT | Red Flag Warning | TFX | 30 hr |
| Jul 24, 3:08 AM MDT | Red Flag Warning | MSO | 18 hr |
| Jul 28, 10:36 AM MDT | Fire Weather Watch | TFX | 40 hr |
| Jul 31, 2:40 PM MDT | Red Flag Warning | MSO | 37 hr |
| Jul 31, 9:59 PM MDT | Red Flag Warning | TFX | 29 hr |
| Aug 11, 1:03 PM MDT | Red Flag Warning | MSO | 56 hr |
| Aug 12, 2:47 PM MDT | Fire Weather Watch | TFX | 13 hr |
| Aug 13, 3:22 AM MDT | Red Flag Warning | TFX | 18 hr |
| Aug 17, 3:09 AM MDT | Red Flag Warning | TFX | 51 hr |
| Aug 17, 11:56 AM MDT | Red Flag Warning | MSO | 57 hr |
| Aug 18, 2:03 PM MDT | Red Flag Warning | MSO | 31 hr |
| Aug 19, 3:28 AM MDT | Red Flag Warning | TFX | 18 hr |
| Aug 24, 8:59 AM MDT | Red Flag Warning | MSO | 14 hr |
| Aug 29, 12:49 PM MDT | Red Flag Warning | MSO | 56 hr |
| Aug 29, 2:41 PM MDT | Red Flag Warning | TFX | 3 days |
| Aug 30, 4:41 PM MDT | Special Weather Statement | MSO | 34 min |
| Sep 1, 2:34 PM MDT | Fire Weather Watch | MSO | 23 hr |
| Sep 1, 2:49 PM MDT | Fire Weather Watch | TFX | 24 hr |
| Sep 2, 3:52 AM MDT | Red Flag Warning | TFX | 65 hr |
| Sep 2, 1:45 PM MDT | Red Flag Warning | MSO | 45 hr |
| Sep 7, 1:48 PM MDT | Fire Weather Watch | MSO | 22 hr |
| Sep 7, 2:09 PM MDT | Fire Weather Watch | TFX | 24 hr |
| Sep 8, 11:57 AM MDT | Red Flag Warning | MSO | 33 hr |
| Sep 8, 2:03 PM MDT | Red Flag Warning | TFX | 40 hr |
| Sep 11, 2:53 AM MDT | Red Flag Warning | MSO | 21 hr |
| Sep 11, 2:24 PM MDT | Red Flag Warning | MSO | 32 hr |
| Sep 11, 3:26 PM MDT | Red Flag Warning | TFX | 31 hr |
| Sep 12, 2:02 PM MDT | Red Flag Warning | MSO | 29 hr |
| Sep 12, 2:03 PM MDT | Winter Storm Watch | MSO | 43 hr |
| Sep 14, 9:29 AM MDT | Winter Storm Warning | MSO | 45 hr |
| Sep 19, 10:55 PM MDT | Winter Weather Advisory | MSO | 13 hr |
| Sep 21, 3:33 AM MDT | Winter Weather Advisory | MSO | 44 hr |
| Oct 1, 2:25 PM MDT | Winter Storm Warning | MSO | 40 hr |
| Oct 1, 2:25 PM MDT | Winter Weather Advisory | MSO | 43 hr |
| Oct 6, 11:31 AM MDT | Wind Advisory | MSO | 30 hr |
| Oct 12, 1:11 PM MDT | Winter Weather Advisory | MSO | 30 hr |
| Oct 16, 2:37 PM MDT | Wind Advisory | MSO | 33 hr |
| Oct 21, 2:30 PM MDT | Wind Advisory | MSO | 30 hr |
| Oct 24, 1:08 PM MDT | Wind Advisory | MSO | 29 hr |
| Oct 26, 4:22 AM MDT | Winter Weather Advisory | MSO | 4 hr |
| Oct 31, 2:38 PM MDT | Winter Weather Advisory | MSO | 4 days |
| Nov 1, 9:14 PM MDT | Winter Weather Advisory | MSO | 11 hr |
| Nov 3, 8:38 AM MDT | Winter Storm Warning | MSO | 24 hr |
| Nov 4, 2:35 PM MDT | Winter Weather Advisory | MSO | 45 hr |
| Nov 10, 3:04 AM MST | Dense Fog Advisory | MSO | 8 hr |
| Nov 13, 3:30 AM MST | Winter Weather Advisory | MSO | 30 hr |
| Nov 13, 5:04 AM MST | Dense Fog Advisory | MSO | 5 hr |
| Nov 15, 7:24 PM MST | Winter Weather Advisory | MSO | 19 hr |
| Nov 21, 4:45 AM MST | Dense Fog Advisory | MSO | 6 hr |
| Nov 21, 1:14 PM MST | High Wind Watch | MSO | 38 hr |
| Nov 23, 3:27 AM MST | Wind Advisory | MSO | 25 hr |
| Nov 28, 10:48 AM MST | Winter Weather Advisory | MSO | 21 hr |
| Dec 2, 3:26 AM MST | Winter Weather Advisory | MSO | 44 hr |
| Dec 13, 6:15 AM MST | Winter Weather Advisory | MSO | 14 hr |
| Dec 14, 2:27 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Dec 16, 2:45 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Dec 17, 2:58 PM MST | Winter Storm Watch | MSO | 24 hr |
| Dec 17, 2:58 PM MST | Winter Storm Warning | MSO | 68 hr |
| Dec 19, 4:45 AM MST | Winter Weather Advisory | MSO | 39 hr |
| Dec 21, 4:03 AM MST | Winter Weather Advisory | MSO | 53 hr |
| Dec 22, 3:50 PM MST | Winter Storm Warning | MSO | 7 hr |
| Dec 24, 3:31 AM MST | Winter Weather Advisory | MSO | 43 hr |
| Dec 27, 4:40 AM MST | Winter Storm Watch | MSO | 23 hr |
| Dec 27, 3:02 PM MST | Winter Storm Warning | MSO | 3 days |
| Dec 27, 3:02 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Dec 30, 12:47 PM MST | Winter Weather Advisory | MSO | 10 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 | 5 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 6 |
| Special Weather Statement | 32 |
| Flooding | |
| Flood Watch | 2 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 14 |
| Winter Storm Watch | 7 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 45 |
| Cold | |
| Wind Chill Warning | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Watch | 2 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 27 |
| Fire Weather Watch | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.