Alert archive / Montana / Granite County
Weather alerts in Granite County, Montana, 2011
145 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Granite County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 145
- Warnings
- 33
- Watches
- 18
- Advisories
- 76
- Busiest month
- February22 alerts
- Busiest day
- July 13, 20116 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Granite County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 0 | 100% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 17 | 9 | 47% | 25 | 60% | 16 min |
| NWS Missoula, MT: flash flood warnings | 4 | 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 2, 1:02 PM MST | Winter Weather Advisory | MSO | 19 hr |
| Jan 4, 2:49 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Jan 7, 4:00 AM MST | Winter Weather Advisory | MSO | 64 hr |
| Jan 9, 10:09 AM MST | Winter Weather Advisory | MSO | 13 hr |
| Jan 11, 3:58 AM MST | Winter Storm Warning | MSO | 61 hr |
| Jan 11, 3:00 PM MST | Winter Weather Advisory | MSO | 50 hr |
| Jan 13, 10:07 PM MST | Freezing Rain Advisory | MSO | 11 hr |
| Jan 16, 3:32 PM MST | Wind Advisory | MSO | 22 hr |
| Jan 18, 3:21 AM MST | Winter Weather Advisory | MSO | 30 hr |
| Jan 20, 2:01 PM MST | Winter Storm Watch | MSO | 13 hr |
| Jan 20, 3:41 PM MST | Winter Weather Advisory | MSO | 4 hr |
| Jan 21, 3:29 AM MST | Winter Storm Warning | MSO | 29 hr |
| Jan 21, 3:29 AM MST | Winter Weather Advisory | MSO | 26 hr |
| Jan 24, 10:51 PM MST | Winter Weather Advisory | MSO | 12 hr |
| Jan 28, 3:21 AM MST | Winter Storm Watch | MSO | 23 hr |
| Jan 28, 3:03 PM MST | Winter Weather Advisory | MSO | 55 hr |
| Jan 29, 2:45 AM MST | Winter Storm Warning | MSO | 38 hr |
| Jan 30, 3:00 PM MST | Wind Chill Warning | MSO | 22 hr |
| Feb 3, 1:32 PM MST | Winter Weather Advisory | MSO | 30 hr |
| Feb 5, 2:22 PM MST | Wind Advisory | MSO | 44 hr |
| Feb 5, 3:04 PM MST | Winter Storm Watch | MSO | 13 hr |
| Feb 6, 4:13 AM MST | Winter Storm Warning | MSO | 53 hr |
| Feb 6, 4:13 AM MST | Winter Weather Advisory | MSO | 61 hr |
| Feb 7, 11:02 PM MST | Wind Chill Advisory | MSO | 10 hr |
| Feb 11, 2:03 PM MST | Wind Advisory | MSO | 44 hr |
| Feb 11, 2:09 PM MST | Winter Weather Advisory | MSO | 43 hr |
| Feb 12, 4:09 AM MST | High Wind Warning | MSO | 29 hr |
| Feb 14, 1:53 PM MST | Winter Storm Warning | MSO | 57 hr |
| Feb 14, 1:53 PM MST | Winter Weather Advisory | MSO | 3 days |
| Feb 15, 2:24 PM MST | Winter Storm Warning | MSO | 39 hr |
| Feb 18, 7:25 AM MST | Winter Weather Advisory | MSO | 3 hr |
| Feb 19, 6:14 PM MST | Winter Weather Advisory | MSO | 34 hr |
| Feb 21, 4:31 AM MST | Winter Weather Advisory | MSO | 52 hr |
| Feb 21, 2:36 PM MST | Winter Storm Warning | MSO | 72 hr |
| Feb 23, 5:18 AM MST | Winter Weather Advisory | MSO | 54 hr |
| Feb 24, 7:34 AM MST | Wind Chill Warning | MSO | 25 hr |
| Feb 25, 1:22 PM MST | Winter Storm Watch | MSO | 25 hr |
| Feb 26, 1:57 PM MST | Wind Advisory | MSO | 56 hr |
| Feb 26, 1:58 PM MST | Winter Storm Warning | MSO | 3 days |
| Feb 26, 1:58 PM MST | Winter Weather Advisory | MSO | 69 hr |
| Mar 4, 7:14 AM MST | Winter Weather Advisory | MSO | 3 hr |
| Mar 5, 9:05 AM MST | Winter Weather Advisory | MSO | 3 hr |
| Mar 10, 9:56 AM MST | Winter Weather Advisory | MSO | 23 hr |
| Mar 14, 3:06 AM MDT | Winter Storm Warning | MSO | 5 hr |
| Mar 14, 2:37 PM MDT | Winter Weather Advisory | MSO | 42 hr |
| Mar 16, 2:29 PM MDT | Winter Weather Advisory | MSO | 16 hr |
| Mar 21, 3:14 AM MDT | Winter Weather Advisory | MSO | 33 hr |
| Mar 21, 11:50 AM MDT | Winter Storm Warning | MSO | 24 hr |
| Mar 27, 7:26 AM MDT | Winter Weather Advisory | MSO | 5 hr |
| Mar 29, 2:10 PM MDT | Wind Advisory | MSO | 51 hr |
| Mar 30, 9:48 AM MDT | Winter Weather Advisory | MSO | 5 hr |
| Mar 31, 9:43 AM MDT | High Wind Warning | MSO | 7 hr |
| Apr 1, 11:31 AM MDT | Winter Weather Advisory | MSO | 48 hr |
| Apr 3, 2:37 PM MDT | Winter Weather Advisory | MSO | 45 hr |
| Apr 5, 3:55 AM MDT | Wind Advisory | MSO | 16 hr |
| Apr 5, 2:13 PM MDT | Winter Weather Advisory | MSO | 3 days |
| Apr 10, 1:59 PM MDT | Winter Weather Advisory | MSO | 31 hr |
| Apr 13, 6:46 PM MDT | Winter Weather Advisory | MSO | 8 hr |
| Apr 14, 2:01 PM MDT | Winter Weather Advisory | MSO | 22 hr |
| Apr 15, 1:59 PM MDT | Winter Weather Advisory | MSO | 20 hr |
| Apr 18, 12:49 PM MDT | Winter Weather Advisory | MSO | 21 hr |
| Apr 20, 2:13 PM MDT | Winter Weather Advisory | MSO | 44 hr |
| Apr 25, 2:22 PM MDT | Winter Weather Advisory | MSO | 20 hr |
| Apr 28, 3:13 AM MDT | Winter Weather Advisory | MSO | 51 hr |
| May 7, 9:01 PM MDT | Winter Storm Watch | MSO | 17 hr |
| May 8, 1:58 PM MDT | Winter Storm Warning | MSO | 22 hr |
| May 8, 1:58 PM MDT | Winter Weather Advisory | MSO | 19 hr |
| May 9, 6:55 PM MDT | Winter Weather Advisory | MSO | 8 hr |
| May 24, 4:37 PM MDT | Areal Flood Advisory | MSO | 68 hr |
| May 25, 3:12 AM MDT | Winter Weather Advisory | MSO | 54 hr |
| May 25, 7:12 AM MDT | Areal Flood Warning | MSO | 53 hr |
| May 28, 2:27 PM MDT | Winter Weather Advisory | MSO | 55 hr |
| Jun 1, 2:51 PM MDT | Flood Watch | MSO | 46 hr |
| Jun 6, 10:40 AM MDT | Flood Watch | MSO | 71 hr |
| Jun 6, 4:13 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 7, 9:59 AM MDT | Areal Flood Warning | MSO | 3 days |
| Jun 7, 12:30 PM MDT | Areal Flood Warning | MSO | 47 hr |
| Jun 7, 5:26 PM MDT | Areal Flood Warning | MSO | 10 days |
| Jun 9, 11:42 AM MDT | Areal Flood Advisory | MSO | 4 days |
| Jun 9, 12:31 PM MDT | Areal Flood Warning | MSO | 7 days |
| Jun 19, 6:39 PM MDT | Areal Flood Warning | MSO | 33 min |
| Jun 22, 12:16 PM MDT | Flood Watch | MSO | 68 hr |
| Jun 23, 12:16 PM MDT | Mesoscale Discussion | SPC | 59 min |
| Jun 23, 12:55 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 4:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Jun 29, 12:35 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jun 29, 2:45 PM MDT | Special Weather Statement | MSO | 45 min |
| Jul 7, 11:43 AM MDT | Wind Advisory | MSO | 33 hr |
| Jul 12, 12:56 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Jul 12, 1:38 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 4:27 PM MDT | Severe Thunderstorm Warning | MSO | 48 min |
| Jul 12, 5:30 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jul 12, 7:17 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Jul 13, 12:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jul 13, 12:45 PM MDT | Flash Flood Watch | MSO | 7 hr |
| Jul 13, 1:45 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 13, 5:11 PM MDT | Areal Flood Advisory | MSO | 3 hr |
| Jul 13, 5:13 PM MDT | Mesoscale Discussion | SPC | 62 min |
| Jul 16, 2:04 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Jul 19, 3:38 PM MDT | Wind Advisory | MSO | 5 hr |
| Jul 19, 7:51 PM MDT | Special Weather Statement | MSO | 39 min |
| Jul 25, 1:44 PM MDT | Special Weather Statement | MSO | 31 min |
| Jul 25, 2:23 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jul 31, 4:20 PM MDT | Special Weather Statement | MSO | 40 min |
| Jul 31, 7:57 PM MDT | Special Weather Statement | MSO | 48 min |
| Aug 13, 7:59 PM MDT | Special Weather Statement | MSO | 61 min |
| Aug 13, 9:05 PM MDT | Special Weather Statement | MSO | 55 min |
| Aug 24, 3:02 PM MDT | Fire Weather Watch | MSO | 13 hr |
| Aug 25, 3:54 AM MDT | Red Flag Warning | MSO | 16 hr |
| Aug 26, 3:54 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Aug 28, 2:52 AM MDT | Red Flag Warning | MSO | 26 hr |
| Aug 29, 2:16 PM MDT | Red Flag Warning | MSO | 30 hr |
| Sep 5, 3:02 AM MDT | Red Flag Warning | MSO | 21 hr |
| Sep 6, 3:31 AM MDT | Red Flag Warning | MSO | 18 hr |
| Sep 24, 2:25 PM MDT | Fire Weather Watch | MSO | 14 hr |
| Sep 25, 4:51 AM MDT | Red Flag Warning | MSO | 16 hr |
| Oct 14, 10:55 AM MDT | Winter Weather Advisory | MSO | 19 hr |
| Oct 28, 11:07 AM MDT | Wind Advisory | MSO | 19 hr |
| Oct 29, 3:18 PM MDT | Wind Advisory | MSO | 4 hr |
| Nov 3, 2:26 PM MDT | Winter Weather Advisory | MSO | 46 hr |
| Nov 9, 2:11 PM MST | Winter Storm Watch | MSO | 22 hr |
| Nov 10, 12:24 PM MST | Winter Storm Warning | MSO | 45 hr |
| Nov 10, 12:24 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Nov 12, 1:50 PM MST | Winter Weather Advisory | MSO | 69 hr |
| Nov 13, 4:21 PM MST | Wind Advisory | MSO | 4 hr |
| Nov 15, 2:10 PM MST | Winter Storm Watch | MSO | 14 hr |
| Nov 15, 6:35 PM MST | Winter Weather Advisory | MSO | 9 hr |
| Nov 16, 3:54 AM MST | Winter Storm Warning | MSO | 43 hr |
| Nov 17, 7:57 AM MST | Wind Advisory | MSO | 6 hr |
| Nov 17, 2:36 PM MST | Winter Weather Advisory | MSO | 38 hr |
| Nov 18, 8:31 AM MST | Winter Storm Warning | MSO | 20 hr |
| Nov 20, 4:27 AM MST | Winter Weather Advisory | MSO | 6 hr |
| Nov 21, 3:42 AM MST | Winter Storm Warning | MSO | 7 hr |
| Nov 21, 10:27 AM MST | Winter Weather Advisory | MSO | 31 hr |
| Nov 23, 1:48 PM MST | Winter Weather Advisory | MSO | 48 hr |
| Nov 28, 2:44 PM MST | Winter Storm Watch | MSO | 14 hr |
| Nov 29, 4:38 AM MST | Winter Storm Warning | MSO | 36 hr |
| Nov 29, 4:38 AM MST | Winter Weather Advisory | MSO | 36 hr |
| Dec 3, 2:08 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Dec 9, 2:47 PM MST | Dense Fog Advisory | MSO | 20 hr |
| Dec 10, 2:44 PM MST | Dense Fog Advisory | MSO | 17 hr |
| Dec 20, 2:45 PM MST | Winter Weather Advisory | MSO | 24 hr |
| Dec 27, 3:15 AM MST | Winter Weather Advisory | MSO | 57 hr |
| Dec 27, 2:19 PM MST | Wind Advisory | MSO | 48 hr |
| Dec 29, 2:30 PM MST | Winter Weather Advisory | MSO | 42 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 | 1 |
| Severe Thunderstorm Watch | 4 |
| Mesoscale Discussion | 11 |
| Special Weather Statement | 7 |
| Flooding | |
| Areal Flood Warning | 6 |
| Flash Flood Watch | 1 |
| Flood Watch | 3 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 16 |
| Winter Storm Watch | 8 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 56 |
| Cold | |
| Wind Chill Warning | 2 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 2 |
| Wind Advisory | 13 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.