Alert archive / Montana / Powell County
Weather alerts in Powell County, Montana, 2023
109 weather alerts in 2023, 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 2023. Tap one for its archive.
- Alerts
- 109
- Warnings
- 11
- Watches
- 12
- Advisories
- 59
- Busiest month
- January14 alerts
- Busiest day
- June 8, 20234 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, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 1 | 50% | 1 | 100% | 4 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2023
| 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 | 3 | 77% | 25 | 20% | 10 min |
| NWS Missoula, MT: flash flood warnings | 7 | 2 | 71% | 4 | 100% | 29 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 7, 9:01 AM MST | Dense Fog Advisory | MSO | 3 hr |
| Jan 9, 1:10 PM MST | Winter Weather Advisory | MSO | 13 hr |
| Jan 13, 12:11 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Jan 14, 5:46 AM MST | Winter Storm Warning | MSO | 5 hr |
| Jan 15, 10:02 AM MST | Winter Weather Advisory | MSO | 24 hr |
| Jan 16, 11:05 AM MST | Winter Weather Advisory | MSO | 23 hr |
| Jan 20, 1:43 PM MST | Winter Weather Advisory | MSO | 42 hr |
| Jan 25, 11:39 AM MST | Winter Storm Watch | MSO | 24 min |
| Jan 25, 11:46 AM MST | Winter Storm Watch | MSO | 26 hr |
| Jan 26, 1:59 PM MST | Winter Storm Warning | MSO | 47 hr |
| Jan 26, 1:59 PM MST | Winter Weather Advisory | MSO | 51 hr |
| Jan 28, 10:57 AM MST | Winter Weather Advisory | MSO | 6 hr |
| Jan 28, 1:48 PM MST | Wind Chill Advisory | MSO | 20 hr |
| Jan 31, 7:09 AM MST | Winter Weather Advisory | MSO | 28 hr |
| Feb 7, 1:19 AM MST | Winter Weather Advisory | MSO | 34 hr |
| Feb 12, 12:24 PM MST | Winter Weather Advisory | MSO | 60 hr |
| Feb 18, 2:41 AM MST | Winter Weather Advisory | MSO | 16 hr |
| Feb 18, 2:25 PM MST | Winter Storm Watch | MSO | 72 hr |
| Feb 18, 2:25 PM MST | Winter Weather Advisory | MSO | 4 days |
| Feb 19, 2:02 PM MST | Winter Storm Warning | MSO | 61 hr |
| Feb 20, 2:51 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Feb 21, 2:20 PM MST | Wind Chill Warning | MSO | 24 hr |
| Feb 21, 9:00 PM MST | Wind Chill Advisory | MSO | 39 hr |
| Feb 23, 3:15 AM MST | Wind Chill Warning | MSO | 9 hr |
| Feb 23, 3:15 AM MST | Wind Chill Advisory | MSO | 4 hr |
| Feb 23, 12:07 PM MST | Wind Chill Advisory | MSO | 20 hr |
| Feb 26, 6:39 PM MST | Winter Weather Advisory | MSO | 9 hr |
| Mar 1, 3:54 AM MST | Winter Weather Advisory | MSO | 64 hr |
| Mar 2, 9:08 PM MST | Special Weather Statement | MSO | 52 min |
| Mar 2, 10:17 PM MST | Special Weather Statement | MSO | 58 min |
| Mar 4, 3:22 AM MST | Winter Weather Advisory | MSO | 36 hr |
| Mar 6, 10:33 AM MST | Winter Weather Advisory | MSO | 14 hr |
| Mar 9, 12:07 PM MST | Winter Weather Advisory | MSO | 47 hr |
| Mar 13, 3:12 AM MDT | Winter Weather Advisory | MSO | 30 hr |
| Mar 14, 11:54 AM MDT | Winter Weather Advisory | MSO | 26 hr |
| Mar 19, 2:40 PM MDT | Winter Weather Advisory | MSO | 42 hr |
| Mar 25, 3:15 AM MDT | Winter Weather Advisory | MSO | 45 hr |
| Mar 28, 1:21 PM MDT | Winter Weather Advisory | MSO | 59 hr |
| Mar 31, 1:05 PM MDT | Winter Weather Advisory | MSO | 44 hr |
| Apr 9, 2:34 PM MDT | Wind Advisory | MSO | 52 hr |
| Apr 11, 2:32 PM MDT | Winter Weather Advisory | MSO | 45 hr |
| Apr 17, 1:49 PM MDT | Winter Weather Advisory | MSO | 23 hr |
| Apr 18, 8:32 PM MDT | Winter Weather Advisory | MSO | 9 hr |
| Apr 20, 2:01 PM MDT | Winter Weather Advisory | MSO | 22 hr |
| Apr 23, 2:32 PM MDT | Winter Weather Advisory | MSO | 39 hr |
| May 17, 12:11 AM MDT | Special Weather Statement | MSO | 64 min |
| May 22, 11:36 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 12:01 PM MDT | Special Weather Statement | MSO | 44 min |
| May 22, 12:06 PM MDT | Severe Thunderstorm Warning | MSO | 24 min |
| May 31, 1:55 PM MDT | Flood Watch | MSO | 4 hr |
| Jun 7, 10:50 AM MDT | Flood Watch | MSO | 12 hr |
| Jun 8, 3:02 AM MDT | Flood Watch | MSO | 18 hr |
| Jun 8, 12:13 PM MDT | Areal Flood Advisory | MSO | 6 hr |
| Jun 8, 1:11 PM MDT | Areal Flood Advisory | MSO | 4 hr |
| Jun 8, 3:16 PM MDT | Areal Flood Advisory | MSO | 3 hr |
| Jun 10, 4:45 PM MDT | Special Weather Statement | MSO | 30 min |
| Jun 11, 7:35 PM MDT | Special Weather Statement | TFX | 25 min |
| Jun 12, 5:48 PM MDT | Special Weather Statement | MSO | 42 min |
| Jun 27, 1:17 PM MDT | Special Weather Statement | MSO | 28 min |
| Jul 1, 11:34 AM MDT | Special Weather Statement | MSO | 41 min |
| Jul 6, 3:53 PM MDT | Special Weather Statement | MSO | 52 min |
| Jul 10, 2:07 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 11, 12:58 AM MDT | Special Weather Statement | MSO | 32 min |
| Jul 22, 1:24 PM MDT | Fire Weather Watch | MSO | 25 hr |
| Jul 23, 2:06 PM MDT | Red Flag Warning | MSO | 34 hr |
| Jul 27, 4:19 PM MDT | Severe Thunderstorm Warning | MSO | 16 min |
| Jul 27, 4:37 PM MDT | Special Weather Statement | MSO | 38 min |
| Jul 27, 5:35 PM MDT | Special Weather Statement | MSO | 40 min |
| Jul 28, 4:29 PM MDT | Special Weather Statement | MSO | 31 min |
| Jul 28, 5:46 PM MDT | Special Weather Statement | MSO | 29 min |
| Jul 28, 6:16 PM MDT | Special Weather Statement | MSO | 29 min |
| Jul 28, 9:45 PM MDT | Special Weather Statement | MSO | 30 min |
| Aug 14, 12:27 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 14, 12:27 PM MDT | Fire Weather Watch | MSO | 3 days |
| Aug 15, 12:26 PM MDT | Red Flag Warning | MSO | 3 days |
| Aug 16, 1:25 PM MDT | Fire Weather Watch | MSO | 19 hr |
| Aug 17, 11:53 AM MDT | Red Flag Warning | TFX | 33 hr |
| Aug 20, 12:20 PM MDT | Wind Advisory | MSO | 34 hr |
| Aug 22, 1:50 PM MDT | Special Weather Statement | MSO | 40 min |
| Aug 22, 3:07 PM MDT | Special Weather Statement | MSO | 38 min |
| Aug 22, 9:13 PM MDT | Special Weather Statement | MSO | 32 min |
| Aug 25, 5:05 PM MDT | Special Weather Statement | MSO | 25 min |
| Aug 29, 2:54 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 29, 4:53 PM MDT | Special Weather Statement | MSO | 37 min |
| Aug 29, 7:16 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Sep 8, 3:43 AM MDT | Special Weather Statement | MSO | 32 min |
| Sep 8, 5:31 PM MDT | Special Weather Statement | MSO | 29 min |
| Sep 20, 11:32 AM MDT | Wind Advisory | MSO | 22 hr |
| Sep 20, 1:52 PM MDT | Winter Weather Advisory | MSO | 46 hr |
| Oct 16, 1:25 PM MDT | Wind Advisory | MSO | 29 hr |
| Oct 22, 1:25 PM MDT | Winter Storm Watch | MSO | 24 hr |
| Oct 23, 1:40 PM MDT | Winter Storm Warning | MSO | 46 hr |
| Oct 23, 1:40 PM MDT | Winter Weather Advisory | MSO | 4 days |
| Oct 30, 10:10 AM MDT | Air Stagnation Advisory | MSO | 62 hr |
| Nov 1, 10:37 AM MDT | Winter Weather Advisory | MSO | 25 hr |
| Nov 10, 8:48 AM MST | Wind Advisory | MSO | 38 hr |
| Nov 13, 1:15 PM MST | Winter Weather Advisory | MSO | 68 hr |
| Nov 19, 7:08 AM MST | Winter Weather Advisory | MSO | 3 hr |
| Nov 21, 11:38 AM MST | Winter Weather Advisory | MSO | 53 hr |
| Nov 22, 6:48 AM MST | Winter Weather Advisory | MSO | 2 hr |
| Nov 27, 11:48 AM MST | Air Stagnation Advisory | MSO | 70 hr |
| Nov 30, 10:44 AM MST | Winter Weather Advisory | MSO | 63 hr |
| Dec 2, 1:09 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Dec 6, 2:35 AM MST | Winter Weather Advisory | MSO | 66 hr |
| Dec 8, 2:05 PM MST | Winter Weather Advisory | MSO | 63 hr |
| Dec 10, 1:29 PM MST | Winter Weather Advisory | MSO | 22 hr |
| Dec 14, 10:53 AM MST | Air Stagnation Advisory | MSO | 5 days |
| Dec 22, 6:49 AM MST | Dense Fog Advisory | MSO | 5 hr |
| Dec 22, 11:43 AM MST | Winter Weather Advisory | MSO | 23 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 | 2 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 3 |
| Special Weather Statement | 24 |
| Flooding | |
| Flood Watch | 3 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 42 |
| Cold | |
| Wind Chill Warning | 2 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 4 |
| Fog and smoke | |
| Air Stagnation Advisory | 3 |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.