Alert archive / Montana / Granite County
Weather alerts in Granite County, Montana, 2015
115 weather alerts in 2015, 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 2015. Tap one for its archive.
- Alerts
- 115
- Warnings
- 22
- Watches
- 14
- Advisories
- 57
- Busiest month
- November19 alerts
- Busiest day
- August 11, 20154 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, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 4 | 3 | 25% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 19 | 8 | 58% | 18 | 67% | 14 min |
| NWS Missoula, MT: flash flood warnings | 1 | 0 | 100% | 3 | 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 1, 2:33 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Jan 2, 2:41 PM MST | Winter Storm Watch | MSO | 46 hr |
| Jan 3, 2:04 PM MST | Winter Storm Warning | MSO | 23 hr |
| Jan 3, 2:04 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Jan 4, 12:54 PM MST | Winter Storm Warning | MSO | 64 hr |
| Jan 8, 1:52 PM MST | Wind Chill Advisory | MSO | 18 hr |
| Jan 10, 12:22 PM MST | Winter Weather Advisory | MSO | 25 hr |
| Jan 15, 11:11 AM MST | Winter Weather Advisory | MSO | 27 hr |
| Jan 16, 3:01 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Jan 19, 9:39 AM MST | Winter Weather Advisory | MSO | 23 hr |
| Jan 23, 2:32 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Jan 25, 6:35 AM MST | Dense Fog Advisory | MSO | 7 hr |
| Feb 1, 4:07 AM MST | Winter Weather Advisory | MSO | 29 hr |
| Feb 2, 1:06 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Feb 3, 4:15 AM MST | Winter Weather Advisory | MSO | 30 hr |
| Feb 7, 11:23 PM MST | Winter Weather Advisory | MSO | 11 hr |
| Feb 8, 9:22 PM MST | Winter Weather Advisory | MSO | 37 hr |
| Feb 19, 10:45 AM MST | Winter Weather Advisory | MSO | 24 hr |
| Feb 20, 2:20 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Feb 21, 2:16 PM MST | Wind Chill Advisory | MSO | 21 hr |
| Feb 24, 2:37 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Feb 25, 8:55 PM MST | Winter Weather Advisory | MSO | 15 hr |
| Feb 27, 11:49 AM MST | Wind Chill Advisory | MSO | 23 hr |
| Feb 27, 11:49 AM MST | Winter Weather Advisory | MSO | 18 hr |
| Mar 1, 5:28 AM MST | Winter Weather Advisory | MSO | 53 hr |
| Mar 2, 9:07 AM MST | Winter Storm Warning | MSO | 17 hr |
| Mar 23, 2:59 PM MDT | Winter Weather Advisory | MSO | 42 hr |
| Mar 27, 9:46 AM MDT | Wind Advisory | MSO | 35 hr |
| Mar 28, 8:27 AM MDT | Special Weather Statement | MSO | 48 min |
| Mar 31, 3:39 AM MDT | Wind Advisory | MSO | 18 hr |
| Apr 4, 1:54 PM MDT | Winter Weather Advisory | MSO | 55 hr |
| Apr 11, 3:32 AM MDT | Wind Advisory | MSO | 16 hr |
| Apr 12, 3:40 AM MDT | Winter Weather Advisory | MSO | 6 hr |
| Apr 13, 2:32 PM MDT | Winter Weather Advisory | MSO | 42 hr |
| Apr 14, 4:05 PM MDT | Winter Storm Warning | MSO | 5 hr |
| Apr 25, 2:14 PM MDT | Winter Weather Advisory | MSO | 20 hr |
| Apr 26, 9:55 AM MDT | Winter Weather Advisory | MSO | 3 hr |
| May 13, 9:31 PM MDT | Special Weather Statement | MSO | 44 min |
| May 27, 12:14 PM MDT | Areal Flood Advisory | MSO | 6 hr |
| May 30, 2:00 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 30, 6:38 PM MDT | Special Weather Statement | MSO | 37 min |
| May 31, 4:23 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 2, 12:11 AM MDT | Special Weather Statement | MSO | 64 min |
| Jun 9, 2:32 PM MDT | Special Weather Statement | MSO | 43 min |
| Jun 15, 7:53 PM MDT | Severe Thunderstorm Warning | MSO | 22 min |
| Jun 29, 9:46 PM MDT | Special Weather Statement | MSO | 59 min |
| Jul 2, 12:39 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Jul 3, 1:07 PM MDT | Red Flag Warning | MSO | 32 hr |
| Jul 11, 3:28 PM MDT | Special Weather Statement | MSO | 17 min |
| Jul 11, 3:46 PM MDT | Areal Flood Advisory | MSO | 3 hr |
| Jul 11, 4:18 PM MDT | Special Weather Statement | MSO | 42 min |
| Jul 11, 6:46 PM MDT | Areal Flood Advisory | MSO | 3 hr |
| Aug 9, 9:19 AM MDT | Fire Weather Watch | MSO | 26 hr |
| Aug 10, 11:16 AM MDT | Red Flag Warning | MSO | 12 hr |
| Aug 10, 5:00 PM MDT | Severe Thunderstorm Warning | MSO | 60 min |
| Aug 10, 5:53 PM MDT | Special Weather Statement | MSO | 52 min |
| Aug 10, 6:04 PM MDT | Severe Thunderstorm Warning | MSO | 26 min |
| Aug 10, 6:44 PM MDT | Severe Thunderstorm Warning | MSO | 61 min |
| Aug 11, 11:26 AM MDT | Red Flag Warning | MSO | 11 hr |
| Aug 11, 4:08 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Aug 13, 4:31 AM MDT | Fire Weather Watch | MSO | 10 hr |
| Aug 13, 2:35 PM MDT | Red Flag Warning | MSO | 38 hr |
| Aug 14, 1:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 14, 1:51 PM MDT | Flash Flood Watch | MSO | 6 hr |
| Aug 14, 2:23 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 14, 7:47 PM MDT | Areal Flood Advisory | MSO | 58 min |
| Aug 19, 2:18 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 20, 2:28 PM MDT | Red Flag Warning | MSO | 31 hr |
| Aug 27, 1:24 PM MDT | Fire Weather Watch | MSO | 21 hr |
| Aug 28, 10:33 AM MDT | Red Flag Warning | MSO | 34 hr |
| Sep 1, 3:44 AM MDT | Fire Weather Watch | MSO | 7 hr |
| Sep 1, 10:47 AM MDT | Red Flag Warning | MSO | 34 hr |
| Sep 4, 11:09 AM MDT | Winter Weather Advisory | MSO | 46 hr |
| Sep 5, 2:25 PM MDT | Special Weather Statement | MSO | 35 min |
| Sep 5, 2:51 PM MDT | Special Weather Statement | MSO | 39 min |
| Oct 2, 1:20 PM MDT | Wind Advisory | MSO | 38 hr |
| Oct 9, 12:24 PM MDT | Wind Advisory | MSO | 57 hr |
| Oct 25, 2:07 PM MDT | Winter Weather Advisory | MSO | 45 hr |
| Nov 2, 4:42 AM MST | Winter Storm Watch | MSO | 10 hr |
| Nov 2, 4:42 AM MST | Winter Weather Advisory | MSO | 51 hr |
| Nov 2, 2:35 PM MST | Winter Storm Warning | MSO | 32 hr |
| Nov 5, 3:46 AM MST | Winter Weather Advisory | MSO | 28 hr |
| Nov 8, 2:36 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Nov 10, 5:36 AM MST | Winter Storm Warning | MSO | 5 hr |
| Nov 10, 2:47 PM MST | Winter Weather Advisory | MSO | 41 hr |
| Nov 11, 3:09 PM MST | Special Weather Statement | MSO | 36 min |
| Nov 11, 5:41 PM MST | Special Weather Statement | MSO | 64 min |
| Nov 11, 6:39 PM MST | Special Weather Statement | MSO | 51 min |
| Nov 11, 7:33 PM MST | Special Weather Statement | MSO | 57 min |
| Nov 11, 8:20 PM MST | Special Weather Statement | MSO | 55 min |
| Nov 13, 12:32 AM MST | Winter Weather Advisory | MSO | 8 hr |
| Nov 16, 11:27 AM MST | High Wind Warning | MSO | 44 hr |
| Nov 16, 11:31 AM MST | Winter Storm Warning | MSO | 47 hr |
| Nov 18, 2:50 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Nov 22, 2:29 PM MST | Winter Storm Watch | MSO | 24 hr |
| Nov 23, 2:09 PM MST | Winter Storm Warning | MSO | 43 hr |
| Nov 25, 12:17 PM MST | Winter Weather Advisory | MSO | 8 hr |
| Dec 3, 7:57 AM MST | Winter Weather Advisory | MSO | 27 hr |
| Dec 4, 6:41 PM MST | Winter Weather Advisory | MSO | 14 hr |
| Dec 7, 4:40 AM MST | Winter Weather Advisory | MSO | 18 hr |
| Dec 7, 10:59 AM MST | Flood Watch | MSO | 23 hr |
| Dec 9, 8:19 AM MST | Wind Advisory | MSO | 9 hr |
| Dec 9, 11:28 AM MST | Special Weather Statement | MSO | 32 min |
| Dec 10, 3:23 AM MST | Winter Weather Advisory | MSO | 30 hr |
| Dec 11, 2:47 PM MST | Winter Storm Watch | MSO | 24 hr |
| Dec 12, 2:45 PM MST | Winter Storm Warning | MSO | 56 hr |
| Dec 12, 2:45 PM MST | Winter Weather Advisory | MSO | 50 hr |
| Dec 15, 10:35 AM MST | Winter Weather Advisory | MSO | 46 hr |
| Dec 17, 11:39 AM MST | Winter Storm Watch | MSO | 16 hr |
| Dec 17, 11:39 AM MST | Winter Weather Advisory | MSO | 59 hr |
| Dec 20, 2:31 PM MST | Winter Storm Warning | MSO | 43 hr |
| Dec 20, 2:31 PM MST | Winter Weather Advisory | MSO | 47 hr |
| Dec 22, 2:11 PM MST | Special Weather Statement | MSO | 64 min |
| Dec 22, 2:47 PM MST | Winter Weather Advisory | MSO | 53 hr |
| Dec 28, 10:25 AM MST | Winter Weather Advisory | MSO | 25 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 | 4 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 4 |
| Special Weather Statement | 18 |
| Flooding | |
| Flash Flood Watch | 1 |
| Flood Watch | 1 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Storm Warning | 10 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 43 |
| Cold | |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 6 |
| Fire | |
| Red Flag Warning | 7 |
| Fire Weather Watch | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20142016
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.