Alert archive / Montana / Powell County
Weather alerts in Powell County, Montana, 2008
148 weather alerts in 2008, 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 2008. Tap one for its archive.
- Alerts
- 148
- Warnings
- 52
- Watches
- 22
- Advisories
- 66
- Busiest month
- August33 alerts
- Busiest day
- August 31, 20086 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, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 3 | 81% | 2 | 50% | 28 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 38 | 11 | 71% | 30 | 67% | 17 min |
| NWS Missoula, MT: flash flood warnings | 1 | 1 | 0% | 9 | 78% | 50 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 3, 3:41 AM MST | Wind Advisory | MSO | 42 hr |
| Jan 9, 2:00 PM MST | Snow Advisory | MSO | 55 hr |
| Jan 13, 2:30 PM MST | Dense Fog Advisory | MSO | 19 hr |
| Jan 14, 2:00 PM MST | Snow and Blowing Snow Advisory | MSO | 27 hr |
| Jan 18, 2:19 PM MST | Snow Advisory | MSO | 51 hr |
| Jan 18, 2:19 PM MST | Winter Storm Warning | MSO | 39 hr |
| Jan 18, 2:19 PM MST | Winter Weather Advisory | MSO | 34 hr |
| Jan 19, 2:29 PM MST | Wind Chill Advisory | MSO | 14 hr |
| Jan 20, 12:45 AM MST | Blizzard Warning | MSO | 4 hr |
| Jan 20, 4:48 AM MST | Wind Chill Warning | MSO | 29 hr |
| Jan 20, 4:48 AM MST | Winter Weather Advisory | MSO | 15 hr |
| Jan 25, 9:16 PM MST | Snow Advisory | MSO | 25 hr |
| Jan 26, 5:44 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Jan 27, 4:10 AM MST | Snow Advisory | MSO | 29 hr |
| Jan 28, 9:03 AM MST | Winter Weather Advisory | MSO | 12 hr |
| Jan 28, 2:49 PM MST | Snow Advisory | MSO | 37 hr |
| Jan 30, 2:03 PM MST | Heavy Snow Warning | MSO | 38 hr |
| Jan 30, 2:03 PM MST | Snow Advisory | MSO | 38 hr |
| Jan 30, 2:10 PM MST | High Wind Watch | MSO | 19 hr |
| Jan 30, 2:10 PM MST | Wind Advisory | MSO | 27 hr |
| Jan 31, 6:12 PM MST | Snow and Blowing Snow Advisory | MSO | 10 hr |
| Feb 1, 3:45 AM MST | Blowing Snow Advisory | MSO | 5 hr |
| Feb 1, 3:45 AM MST | Snow Advisory | MSO | 24 hr |
| Feb 5, 2:27 PM MST | Winter Storm Watch | MSO | 50 hr |
| Feb 6, 10:54 AM MST | High Wind Watch | MSO | 17 hr |
| Feb 6, 10:54 AM MST | High Wind Warning | MSO | 23 hr |
| Feb 6, 10:54 AM MST | Winter Storm Warning | MSO | 52 hr |
| Feb 6, 2:30 PM MST | Winter Storm Watch | MSO | 48 hr |
| Feb 7, 2:50 PM MST | Snow Advisory | MSO | 33 hr |
| Feb 8, 8:32 AM MST | Blowing Snow Advisory | MSO | 13 hr |
| Feb 9, 3:44 AM MST | Snow Advisory | MSO | 11 hr |
| Feb 9, 2:22 PM MST | Snow Advisory | MSO | 40 hr |
| Feb 12, 3:38 AM MST | Winter Weather Advisory | MSO | 27 hr |
| Feb 13, 6:31 AM MST | Snow and Blowing Snow Advisory | MSO | 7 hr |
| Feb 24, 4:44 PM MST | Snow Advisory | MSO | 22 hr |
| Mar 3, 4:55 AM MST | Snow and Blowing Snow Advisory | MSO | 42 hr |
| Mar 3, 4:55 AM MST | Snow Advisory | MSO | 29 hr |
| Mar 3, 10:26 AM MST | Winter Storm Warning | MSO | 36 hr |
| Mar 12, 2:29 PM MDT | Snow Advisory | MSO | 28 hr |
| Mar 19, 2:14 PM MDT | Snow Advisory | MSO | 16 hr |
| Mar 26, 3:06 PM MDT | Snow Advisory | MSO | 20 hr |
| Mar 28, 4:20 AM MDT | Snow Advisory | MSO | 34 hr |
| Mar 30, 3:42 AM MDT | Snow Advisory | MSO | 32 hr |
| Apr 4, 3:11 AM MDT | Snow Advisory | MSO | 33 hr |
| Apr 4, 2:38 PM MDT | Winter Storm Warning | MSO | 21 hr |
| Apr 5, 11:54 AM MDT | Snow Advisory | MSO | 5 hr |
| Apr 9, 9:00 PM MDT | Snow Advisory | MSO | 2 hr |
| Apr 17, 2:22 PM MDT | Winter Storm Watch | MSO | 24 hr |
| Apr 18, 4:38 AM MDT | Wind Advisory | MSO | 16 hr |
| Apr 18, 2:49 PM MDT | Heavy Snow Warning | MSO | 37 hr |
| Apr 18, 2:49 PM MDT | Winter Storm Warning | MSO | 51 hr |
| Apr 29, 10:54 AM MDT | Snow and Blowing Snow Advisory | MSO | 17 hr |
| May 20, 11:21 PM MDT | Severe Thunderstorm Warning | MSO | 39 min |
| May 21, 3:07 AM MDT | Flood Watch | MSO | 4 days |
| May 22, 5:39 AM MDT | Snow Advisory | MSO | 4 hr |
| May 22, 9:37 AM MDT | Heavy Snow Warning | MSO | 23 hr |
| May 27, 1:14 PM MDT | River Flood Warning | MSO | 37 min |
| May 27, 1:36 PM MDT | Areal Flood Warning | MSO | 48 hr |
| May 29, 1:15 PM MDT | Areal Flood Warning | MSO | 23 hr |
| May 30, 12:04 PM MDT | Areal Flood Advisory | MSO | 5 hr |
| Jun 2, 1:19 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jun 4, 7:50 AM MDT | Snow Advisory | MSO | 13 hr |
| Jun 10, 3:41 AM MDT | Heavy Snow Warning | MSO | 40 hr |
| Jun 10, 3:41 AM MDT | Winter Storm Watch | MSO | 11 hr |
| Jul 1, 1:26 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 1, 8:27 PM MDT | Severe Thunderstorm Warning | MSO | 48 min |
| Jul 1, 9:10 PM MDT | Severe Thunderstorm Warning | MSO | 44 min |
| Jul 4, 1:45 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jul 4, 2:04 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 4, 4:27 PM MDT | Severe Thunderstorm Warning | MSO | 26 min |
| Jul 4, 5:40 PM MDT | Severe Thunderstorm Warning | MSO | 48 min |
| Jul 4, 5:45 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jul 4, 7:27 PM MDT | Severe Thunderstorm Warning | MSO | 48 min |
| Jul 4, 8:10 PM MDT | Severe Thunderstorm Warning | MSO | 50 min |
| Jul 4, 8:27 PM MDT | Severe Thunderstorm Warning | MSO | 48 min |
| Jul 9, 1:56 PM MDT | Fire Weather Watch | MSO | 14 hr |
| Jul 9, 2:27 PM MDT | High Wind Warning | MSO | 31 hr |
| Jul 10, 4:01 AM MDT | Red Flag Warning | MSO | 18 hr |
| Jul 30, 2:27 AM MDT | Wind Advisory | MSO | 12 hr |
| Jul 30, 8:24 AM MDT | Red Flag Warning | MSO | 13 hr |
| Jul 31, 4:19 AM MDT | Fire Weather Watch | TFX | 16 hr |
| Jul 31, 8:25 PM MDT | Red Flag Warning | TFX | 25 hr |
| Aug 1, 3:43 AM MDT | Red Flag Warning | MSO | 17 hr |
| Aug 5, 2:32 PM MDT | Fire Weather Watch | MSO | 41 hr |
| Aug 7, 3:45 AM MDT | Red Flag Warning | MSO | 29 hr |
| Aug 9, 11:46 AM MDT | Mesoscale Discussion | SPC | 59 min |
| Aug 9, 12:16 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 9, 12:32 PM MDT | Severe Thunderstorm Warning | MSO | 28 min |
| Aug 9, 5:30 PM MDT | Severe Thunderstorm Warning | MSO | 45 min |
| Aug 9, 5:50 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Aug 17, 1:54 PM MDT | Red Flag Warning | MSO | 54 hr |
| Aug 18, 6:17 AM MDT | Fire Weather Watch | TFX | 23 hr |
| Aug 18, 2:46 PM MDT | Fire Weather Watch | MSO | 13 hr |
| Aug 19, 5:43 AM MDT | Red Flag Warning | TFX | 14 hr |
| Aug 19, 12:43 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Aug 19, 1:31 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 19, 6:47 PM MDT | Severe Thunderstorm Warning | MSO | 43 min |
| Aug 19, 6:54 PM MDT | Areal Flood Advisory | MSO | 66 min |
| Aug 19, 8:04 PM MDT | Areal Flood Advisory | MSO | 56 min |
| Aug 19, 8:04 PM MDT | Areal Flood Advisory | MSO | 56 min |
| Aug 21, 2:18 PM MDT | Red Flag Warning | MSO | 6 hr |
| Aug 24, 4:08 AM MDT | Fire Weather Watch | TFX | 17 hr |
| Aug 24, 4:33 AM MDT | Fire Weather Watch | MSO | 16 hr |
| Aug 24, 4:42 PM MDT | Red Flag Warning | MSO | 4 hr |
| Aug 24, 8:47 PM MDT | Red Flag Warning | MSO | 26 hr |
| Aug 24, 9:08 PM MDT | Red Flag Warning | TFX | 27 hr |
| Aug 28, 2:58 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 29, 2:49 PM MDT | Red Flag Warning | MSO | 30 hr |
| Aug 30, 11:48 PM MDT | Severe Thunderstorm Warning | MSO | 42 min |
| Aug 31, 12:24 AM MDT | Severe Thunderstorm Warning | MSO | 25 min |
| Aug 31, 3:53 AM MDT | Severe Thunderstorm Warning | MSO | 41 min |
| Aug 31, 2:07 PM MDT | Severe Thunderstorm Warning | MSO | 8 min |
| Aug 31, 2:51 PM MDT | Winter Weather Advisory | MSO | 23 hr |
| Aug 31, 3:19 PM MDT | Severe Thunderstorm Warning | MSO | 13 min |
| Oct 7, 12:53 PM MDT | Wind Advisory | MSO | 7 hr |
| Oct 9, 3:45 AM MDT | Winter Weather Advisory | MSO | 10 hr |
| Oct 9, 2:12 PM MDT | Winter Storm Warning | MSO | 25 hr |
| Oct 9, 2:12 PM MDT | Winter Weather Advisory | MSO | 38 hr |
| Oct 11, 3:44 AM MDT | Winter Storm Warning | MSO | 38 hr |
| Nov 3, 2:37 PM MST | Winter Weather Advisory | MSO | 29 hr |
| Nov 8, 7:36 AM MST | Dense Fog Advisory | MSO | 3 hr |
| Nov 11, 2:31 PM MST | Wind Advisory | MSO | 28 hr |
| Nov 13, 4:33 AM MST | Winter Weather Advisory | MSO | 15 hr |
| Nov 19, 2:41 PM MST | Wind Advisory | MSO | 18 hr |
| Nov 20, 2:36 PM MST | Winter Weather Advisory | MSO | 17 hr |
| Nov 26, 4:54 AM MST | Freezing Rain Advisory | MSO | 3 hr |
| Dec 1, 6:30 AM MST | Dense Fog Advisory | MSO | 3 hr |
| Dec 1, 2:50 PM MST | Winter Weather Advisory | MSO | 26 hr |
| Dec 5, 7:51 PM MST | Winter Weather Advisory | MSO | 4 hr |
| Dec 5, 11:25 PM MST | Freezing Rain Advisory | MSO | 10 hr |
| Dec 6, 9:38 PM MST | Winter Weather Advisory | MSO | 30 hr |
| Dec 11, 3:41 AM MST | Winter Storm Watch | MSO | 49 hr |
| Dec 12, 3:54 AM MST | Winter Storm Warning | MSO | 55 hr |
| Dec 12, 11:57 AM MST | Winter Weather Advisory | MSO | 40 hr |
| Dec 13, 4:33 AM MST | Mesoscale Discussion | SPC | 5 hr |
| Dec 13, 2:59 PM MST | Wind Chill Warning | MSO | 50 hr |
| Dec 15, 2:40 PM MST | Winter Storm Watch | MSO | 55 hr |
| Dec 16, 1:41 PM MST | Winter Storm Warning | MSO | 62 hr |
| Dec 19, 4:07 AM MST | Wind Chill Warning | MSO | 10 hr |
| Dec 20, 2:35 PM MST | Winter Weather Advisory | MSO | 50 hr |
| Dec 24, 3:49 AM MST | Winter Weather Advisory | MSO | 37 hr |
| Dec 26, 3:46 AM MST | Winter Storm Watch | MSO | 11 hr |
| Dec 26, 2:36 PM MST | Winter Storm Warning | MSO | 50 hr |
| Dec 27, 4:07 AM MST | Winter Weather Advisory | MSO | 36 hr |
| Dec 28, 7:45 PM MST | Winter Storm Warning | MSO | 25 hr |
| Dec 28, 7:45 PM MST | Winter Weather Advisory | MSO | 25 hr |
| Dec 30, 4:15 AM MST | Winter Storm Watch | MSO | 15 hr |
| Dec 30, 2:35 PM MST | Winter Weather Advisory | MSO | 32 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20072009
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.