Alert archive / Montana / Sanders County
Weather alerts in Sanders County, Montana, 2012
119 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sanders County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 119
- Warnings
- 28
- Watches
- 13
- Advisories
- 65
- Busiest month
- January16 alerts
- Busiest day
- July 20, 20126 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sanders County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 6 | 25% | 5 | 80% | 26 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 57 | 25 | 56% | 71 | 49% | 20 min |
| NWS Missoula, MT: flash flood warnings | 6 | 0 | 100% | 6 | 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 3, 1:08 AM MST | Freezing Rain Advisory | MSO | 9 hr |
| Jan 5, 8:18 AM MST | Wind Advisory | MSO | 8 hr |
| Jan 8, 2:39 AM MST | Winter Weather Advisory | MSO | 9 hr |
| Jan 9, 6:14 AM MST | Freezing Fog Advisory | MSO | 7 hr |
| Jan 9, 10:34 AM MST | Winter Weather Advisory | MSO | 25 hr |
| Jan 10, 12:54 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Jan 13, 2:56 PM MST | Winter Weather Advisory | MSO | 62 hr |
| Jan 15, 2:46 PM MST | Winter Storm Watch | MSO | 48 hr |
| Jan 16, 3:30 PM MST | Winter Storm Warning | MSO | 4 days |
| Jan 17, 2:53 PM MST | Winter Weather Advisory | MSO | 66 hr |
| Jan 20, 2:23 PM MST | Winter Weather Advisory | MSO | 39 hr |
| Jan 22, 2:19 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Jan 24, 4:15 AM MST | Winter Weather Advisory | MSO | 66 hr |
| Jan 28, 2:18 PM MST | Winter Weather Advisory | MSO | 51 hr |
| Jan 29, 3:37 AM MST | Freezing Rain Advisory | MSO | 5 hr |
| Jan 29, 10:27 AM MST | Wind Advisory | MSO | 10 hr |
| Feb 8, 11:53 PM MST | Winter Weather Advisory | MSO | 11 hr |
| Feb 10, 4:39 AM MST | Winter Weather Advisory | MSO | 30 hr |
| Feb 12, 4:39 AM MST | Winter Weather Advisory | MSO | 6 hr |
| Feb 13, 3:51 AM MST | Dense Fog Advisory | MSO | 7 hr |
| Feb 17, 3:36 AM MST | Winter Weather Advisory | MSO | 55 hr |
| Feb 19, 3:03 PM MST | High Wind Watch | MSO | 54 hr |
| Feb 19, 3:06 PM MST | Winter Storm Watch | MSO | 47 hr |
| Feb 21, 3:46 AM MST | Winter Storm Warning | MSO | 48 hr |
| Feb 21, 3:47 AM MST | Wind Advisory | MSO | 43 hr |
| Feb 21, 10:28 AM MST | High Wind Warning | MSO | 31 hr |
| Feb 22, 4:53 PM MST | Winter Weather Advisory | MSO | 16 hr |
| Feb 23, 2:11 PM MST | Winter Storm Watch | MSO | 24 hr |
| Feb 24, 2:18 PM MST | Winter Storm Warning | MSO | 37 hr |
| Feb 24, 2:18 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Feb 28, 11:44 AM MST | Winter Weather Advisory | MSO | 59 hr |
| Mar 2, 11:20 AM MST | Winter Weather Advisory | MSO | 26 hr |
| Mar 5, 1:30 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Mar 10, 3:30 AM MST | Winter Weather Advisory | MSO | 38 hr |
| Mar 12, 12:04 PM MDT | Winter Weather Advisory | MSO | 45 hr |
| Mar 12, 12:22 PM MDT | Wind Advisory | MSO | 30 hr |
| Mar 14, 2:29 PM MDT | Winter Weather Advisory | MSO | 49 hr |
| Mar 19, 2:54 PM MDT | Winter Weather Advisory | MSO | 66 hr |
| Mar 20, 2:25 PM MDT | Winter Storm Warning | MSO | 43 hr |
| Mar 29, 9:07 AM MDT | Areal Flood Advisory | MSO | 48 hr |
| Mar 30, 8:29 AM MDT | Lake Wind Advisory | MSO | 9 hr |
| Mar 31, 2:45 PM MDT | Winter Weather Advisory | MSO | 23 hr |
| Apr 3, 4:25 AM MDT | Winter Weather Advisory | MSO | 39 hr |
| Apr 4, 4:43 AM MDT | Lake Wind Advisory | MSO | 15 hr |
| Apr 20, 8:59 AM MDT | Lake Wind Advisory | MSO | 9 hr |
| Apr 23, 2:41 PM MDT | Flood Watch | MSO | 5 days |
| Apr 24, 1:58 PM MDT | Areal Flood Warning | MSO | 23 hr |
| Apr 25, 1:03 PM MDT | Areal Flood Warning | MSO | 45 hr |
| Apr 25, 1:21 PM MDT | Areal Flood Warning | MSO | 39 min |
| Apr 26, 8:12 AM MDT | Wind Advisory | MSO | 10 hr |
| May 10, 11:03 AM MDT | Freeze Warning | MSO | 22 hr |
| May 24, 10:48 AM MDT | Wind Advisory | MSO | 30 hr |
| Jun 4, 12:49 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jun 4, 1:46 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 4, 4:45 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jun 4, 7:42 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jun 4, 10:08 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jun 4, 11:11 PM MDT | Severe Thunderstorm Warning | MSO | 35 min |
| Jun 6, 9:30 AM MDT | Lake Wind Advisory | MSO | 5 hr |
| Jun 16, 12:42 PM MDT | Wind Advisory | MSO | 32 hr |
| Jun 17, 7:34 AM MDT | Lake Wind Advisory | MSO | 13 hr |
| Jun 23, 2:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jun 23, 7:14 PM MDT | Severe Thunderstorm Warning | MSO | 31 min |
| Jun 26, 5:02 AM MDT | Special Weather Statement | MSO | 28 min |
| Jun 26, 6:38 AM MDT | Severe Thunderstorm Warning | MSO | 52 min |
| Jun 26, 8:50 AM MDT | Lake Wind Advisory | MSO | 9 hr |
| Jun 30, 8:33 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 11:26 PM MDT | Special Weather Statement | MSO | 64 min |
| Jul 1, 2:15 AM MDT | Severe Thunderstorm Warning | MSO | 45 min |
| Jul 3, 3:53 AM MDT | Wind Advisory | MSO | 17 hr |
| Jul 12, 11:50 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 15, 1:49 PM MDT | Areal Flood Warning | MSO | 4 hr |
| Jul 16, 3:04 PM MDT | Flash Flood Watch | MSO | 5 hr |
| Jul 19, 1:06 PM MDT | Flash Flood Watch | MSO | 31 hr |
| Jul 20, 12:38 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 20, 3:09 PM MDT | Severe Thunderstorm Warning | MSO | 51 min |
| Jul 20, 3:52 PM MDT | Special Weather Statement | MSO | 53 min |
| Jul 20, 4:21 PM MDT | Severe Thunderstorm Warning | MSO | 39 min |
| Jul 20, 4:31 PM MDT | Severe Thunderstorm Warning | MSO | 59 min |
| Jul 20, 4:53 PM MDT | Severe Thunderstorm Warning | MSO | 67 min |
| Jul 20, 6:21 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jul 22, 5:06 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Aug 5, 2:44 PM MDT | Fire Weather Watch | MSO | 14 hr |
| Aug 5, 2:44 PM MDT | Red Flag Warning | MSO | 29 hr |
| Aug 21, 2:45 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 22, 2:32 PM MDT | Lake Wind Advisory | MSO | 50 hr |
| Sep 5, 11:32 AM MDT | Wind Advisory | MSO | 24 hr |
| Sep 8, 8:34 AM MDT | Red Flag Warning | MSO | 63 hr |
| Sep 10, 9:48 AM MDT | Freeze Warning | MSO | 47 hr |
| Sep 10, 9:48 AM MDT | Lake Wind Advisory | MSO | 10 hr |
| Sep 11, 11:57 AM MDT | Freeze Warning | MSO | 46 hr |
| Oct 1, 4:50 AM MDT | Lake Wind Advisory | MSO | 56 hr |
| Oct 14, 7:28 PM MDT | Wind Advisory | MSO | 46 hr |
| Oct 15, 4:39 AM MDT | High Wind Warning | MSO | 40 hr |
| Oct 19, 10:55 AM MDT | Wind Advisory | MSO | 29 hr |
| Oct 19, 11:20 AM MDT | Winter Weather Advisory | MSO | 32 hr |
| Oct 21, 2:36 PM MDT | Winter Storm Watch | MSO | 12 hr |
| Oct 22, 2:34 AM MDT | Winter Storm Warning | MSO | 25 hr |
| Oct 22, 2:34 AM MDT | Winter Weather Advisory | MSO | 48 hr |
| Oct 24, 1:53 PM MDT | Winter Weather Advisory | MSO | 22 hr |
| Oct 26, 2:09 PM MDT | Winter Weather Advisory | MSO | 22 hr |
| Nov 6, 4:21 AM MST | Winter Storm Watch | MSO | 49 hr |
| Nov 7, 12:04 PM MST | Winter Weather Advisory | MSO | 53 hr |
| Nov 19, 9:41 AM MST | Winter Weather Advisory | MSO | 3 hr |
| Nov 20, 2:06 PM MST | Winter Weather Advisory | MSO | 39 hr |
| Nov 23, 10:54 AM MST | Winter Weather Advisory | MSO | 41 hr |
| Nov 29, 1:58 AM MST | Winter Weather Advisory | MSO | 7 hr |
| Nov 30, 1:10 PM MST | Winter Storm Watch | MSO | 23 hr |
| Dec 1, 12:07 PM MST | Winter Storm Warning | MSO | 31 hr |
| Dec 2, 7:04 PM MST | Winter Weather Advisory | MSO | 16 hr |
| Dec 6, 10:22 AM MST | Winter Weather Advisory | MSO | 52 hr |
| Dec 7, 7:23 PM MST | Winter Storm Warning | MSO | 13 hr |
| Dec 9, 2:16 PM MST | Winter Weather Advisory | MSO | 19 hr |
| Dec 11, 1:51 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Dec 15, 2:57 PM MST | Winter Weather Advisory | MSO | 60 hr |
| Dec 16, 12:35 PM MST | Winter Storm Warning | MSO | 33 hr |
| Dec 18, 2:39 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Dec 23, 2:08 PM MST | Winter Weather Advisory | MSO | 33 hr |
| Dec 23, 5:21 PM MST | Winter Storm Warning | MSO | 30 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 archive20112013
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.