Alert archive / Montana / Powell County
Weather alerts in Powell County, Montana, 2018
123 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 123
- Warnings
- 23
- Watches
- 16
- Advisories
- 62
- Busiest month
- June21 alerts
- Busiest day
- June 9, 20188 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, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 2 | 33% | 1 | 100% | 23 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 Missoula, MT: severe thunderstorm warnings | 11 | 9 | 18% | 17 | 76% | 18 min |
| NWS Missoula, MT: flash flood warnings | 1 | 0 | 100% | 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 5, 12:58 PM MST | Winter Weather Advisory | MSO | 22 hr |
| Jan 9, 3:56 AM MST | Winter Weather Advisory | MSO | 37 hr |
| Jan 9, 2:25 PM MST | Winter Storm Watch | MSO | 24 hr |
| Jan 10, 2:16 PM MST | Winter Weather Advisory | MSO | 42 hr |
| Jan 17, 1:59 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Jan 17, 1:59 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Jan 23, 3:31 AM MST | Winter Weather Advisory | MSO | 35 hr |
| Jan 24, 2:06 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Jan 25, 8:58 PM MST | Winter Weather Advisory | MSO | 13 hr |
| Jan 30, 1:05 AM MST | Wind Advisory | MSO | 16 hr |
| Jan 30, 8:10 PM MST | Winter Weather Advisory | MSO | 13 hr |
| Feb 2, 2:43 PM MST | Winter Storm Watch | MSO | 22 hr |
| Feb 3, 4:09 AM MST | Winter Storm Warning | MSO | 32 hr |
| Feb 3, 12:48 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Feb 4, 11:54 AM MST | Winter Weather Advisory | MSO | 32 hr |
| Feb 7, 2:27 PM MST | Winter Weather Advisory | MSO | 53 hr |
| Feb 11, 11:22 AM MST | Winter Weather Advisory | MSO | 12 hr |
| Feb 13, 2:18 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Feb 15, 3:18 PM MST | Winter Storm Watch | MSO | 44 hr |
| Feb 15, 3:18 PM MST | Winter Weather Advisory | MSO | 50 hr |
| Feb 16, 2:53 PM MST | Winter Storm Warning | MSO | 57 hr |
| Feb 16, 2:53 PM MST | Winter Weather Advisory | MSO | 69 hr |
| Feb 18, 2:26 PM MST | Wind Chill Advisory | MSO | 23 hr |
| Feb 24, 6:50 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Mar 1, 3:11 AM MST | Winter Weather Advisory | MSO | 48 hr |
| Mar 2, 8:08 AM MST | Winter Weather Advisory | MSO | 14 hr |
| Mar 2, 2:48 PM MST | Special Weather Statement | MSO | 42 min |
| Mar 2, 3:48 PM MST | Special Weather Statement | MSO | 57 min |
| Mar 3, 2:05 PM MST | Winter Weather Advisory | MSO | 24 hr |
| Mar 8, 7:26 AM MST | Winter Weather Advisory | MSO | 25 hr |
| Mar 14, 12:54 PM MDT | Winter Weather Advisory | MSO | 28 hr |
| Mar 16, 3:17 AM MDT | Winter Weather Advisory | MSO | 57 hr |
| Mar 28, 4:46 AM MDT | Winter Weather Advisory | MSO | 4 hr |
| Mar 31, 7:21 AM MDT | Winter Weather Advisory | MSO | 4 hr |
| Apr 1, 3:49 AM MDT | Winter Weather Advisory | MSO | 50 hr |
| Apr 4, 2:39 PM MDT | Winter Storm Watch | MSO | 21 hr |
| Apr 4, 2:39 PM MDT | Winter Weather Advisory | MSO | 21 hr |
| Apr 5, 12:07 PM MDT | Winter Storm Warning | MSO | 24 hr |
| Apr 11, 12:48 PM MDT | Winter Weather Advisory | MSO | 29 hr |
| Apr 20, 1:53 PM MDT | Wind Advisory | MSO | 31 hr |
| Apr 29, 2:30 PM MDT | Winter Weather Advisory | MSO | 20 hr |
| Apr 30, 1:59 PM MDT | Areal Flood Advisory | MSO | 43 hr |
| Apr 30, 5:34 PM MDT | Areal Flood Advisory | MSO | 4 days |
| May 6, 10:24 AM MDT | Areal Flood Warning | MSO | 12 days |
| May 7, 2:42 PM MDT | Areal Flood Advisory | MSO | 67 hr |
| May 10, 9:45 AM MDT | Areal Flood Warning | MSO | 47 hr |
| May 10, 11:18 AM MDT | Areal Flood Advisory | MSO | 46 hr |
| May 10, 1:35 PM MDT | Winter Weather Advisory | MSO | 18 hr |
| May 14, 1:21 PM MDT | Flood Watch | MSO | 71 hr |
| May 25, 6:16 PM MDT | Special Weather Statement | MSO | 44 min |
| May 26, 2:21 PM MDT | Mesoscale Discussion | SPC | 114 min |
| May 30, 10:35 AM MDT | Flood Watch | MSO | 47 hr |
| May 31, 12:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| May 31, 1:50 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 4, 1:47 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jun 4, 5:08 PM MDT | Special Weather Statement | MSO | 52 min |
| Jun 7, 4:38 PM MDT | Special Weather Statement | MSO | 37 min |
| Jun 8, 2:18 PM MDT | Wind Advisory | MSO | 31 hr |
| Jun 9, 11:54 AM MDT | Winter Weather Advisory | MSO | 48 hr |
| Jun 9, 1:06 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 9, 1:20 PM MDT | Special Weather Statement | MSO | 40 min |
| Jun 9, 1:46 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 9, 2:02 PM MDT | Special Weather Statement | MSO | 43 min |
| Jun 9, 3:17 PM MDT | Special Weather Statement | MSO | 13 min |
| Jun 9, 3:27 PM MDT | Severe Thunderstorm Warning | MSO | 33 min |
| Jun 9, 4:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 11, 1:15 PM MDT | Frost Advisory | MSO | 19 hr |
| Jun 19, 8:12 AM MDT | Areal Flood Advisory | MSO | 13 hr |
| Jun 19, 9:09 PM MDT | Areal Flood Warning | MSO | 12 hr |
| Jun 20, 6:37 AM MDT | Areal Flood Warning | MSO | 44 hr |
| Jun 20, 9:11 AM MDT | Areal Flood Warning | MSO | 13 min |
| Jun 25, 5:02 PM MDT | Special Weather Statement | MSO | 13 min |
| Jun 25, 5:29 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 25, 5:38 PM MDT | Special Weather Statement | MSO | 52 min |
| Jun 25, 6:31 PM MDT | Special Weather Statement | MSO | 14 min |
| Jul 20, 2:00 PM MDT | Red Flag Warning | TFX | 34 hr |
| Jul 20, 2:51 PM MDT | Fire Weather Watch | MSO | 31 hr |
| Jul 26, 1:10 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 7:43 AM MDT | Fire Weather Watch | MSO | 6 hr |
| Jul 27, 2:07 PM MDT | Red Flag Warning | MSO | 5 hr |
| Jul 27, 4:25 PM MDT | Special Weather Statement | MSO | 65 min |
| Jul 27, 4:39 PM MDT | Severe Thunderstorm Warning | MSO | 36 min |
| Jul 27, 5:22 PM MDT | Severe Thunderstorm Warning | MSO | 53 min |
| Jul 31, 2:49 PM MDT | Fire Weather Watch | MSO | 14 hr |
| Aug 1, 4:19 AM MDT | Red Flag Warning | MSO | 17 hr |
| Aug 1, 11:03 AM MDT | Red Flag Warning | TFX | 59 hr |
| Aug 1, 12:04 PM MDT | Red Flag Warning | MSO | 34 hr |
| Aug 2, 3:36 AM MDT | Red Flag Warning | MSO | 42 hr |
| Aug 7, 2:46 PM MDT | Heat Advisory | MSO | 3 days |
| Aug 8, 3:25 AM MDT | Fire Weather Watch | TFX | 36 hr |
| Aug 8, 2:13 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 9, 2:23 PM MDT | Red Flag Warning | MSO | 3 days |
| Aug 9, 3:02 PM MDT | Red Flag Warning | TFX | 3 days |
| Aug 15, 2:14 PM MDT | Fire Weather Watch | MSO | 32 hr |
| Aug 15, 2:14 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 15, 2:19 PM MDT | Fire Weather Watch | TFX | 25 hr |
| Aug 16, 2:26 PM MDT | Red Flag Warning | MSO | 37 hr |
| Aug 16, 3:01 PM MDT | Red Flag Warning | TFX | 33 hr |
| Aug 18, 3:44 PM MDT | Special Weather Statement | MSO | 31 min |
| Sep 7, 5:22 PM MDT | Special Weather Statement | MSO | 38 min |
| Sep 28, 10:11 AM MDT | Wind Advisory | MSO | 38 hr |
| Sep 28, 2:26 PM MDT | Winter Weather Advisory | MSO | 43 hr |
| Oct 9, 3:48 AM MDT | Winter Weather Advisory | MSO | 29 hr |
| Oct 13, 1:31 AM MDT | Winter Weather Advisory | MSO | 10 hr |
| Nov 2, 3:38 AM MDT | Wind Advisory | MSO | 17 hr |
| Nov 5, 2:53 AM MST | Winter Weather Advisory | MSO | 33 hr |
| Nov 6, 2:18 PM MST | Winter Weather Advisory | MSO | 42 hr |
| Nov 9, 6:06 PM MST | Winter Weather Advisory | MSO | 16 hr |
| Nov 10, 6:05 PM MST | Winter Weather Advisory | MSO | 3 hr |
| Nov 11, 1:49 PM MST | Winter Weather Advisory | MSO | 7 hr |
| Nov 15, 1:38 PM MST | Winter Weather Advisory | MSO | 37 hr |
| Nov 16, 1:12 PM MST | Special Weather Statement | MSO | 48 min |
| Nov 21, 2:47 PM MST | Winter Weather Advisory | MSO | 69 hr |
| Nov 22, 1:53 PM MST | Winter Storm Warning | MSO | 46 hr |
| Dec 10, 2:42 PM MST | Winter Weather Advisory | MSO | 50 hr |
| Dec 17, 7:59 AM MST | Winter Weather Advisory | MSO | 2 hr |
| Dec 17, 2:37 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Dec 20, 2:39 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Dec 22, 3:34 AM MST | Winter Weather Advisory | MSO | 64 hr |
| Dec 28, 2:40 PM MST | Winter Weather Advisory | MSO | 24 hr |
| Dec 29, 2:11 PM MST | Winter Storm Warning | MSO | 30 hr |
| Dec 29, 2:11 PM MST | Winter Weather Advisory | MSO | 39 hr |
| Dec 30, 2:16 PM MST | Winter Weather Advisory | MSO | 15 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 | 3 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 7 |
| Special Weather Statement | 15 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flood Watch | 2 |
| Areal Flood Advisory | 5 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 49 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Frost Advisory | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 10 |
| Fire Weather Watch | 8 |
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.