Alert archive / Montana / Granite County
Weather alerts in Granite County, Montana, 2013
120 weather alerts in 2013, 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 2013. Tap one for its archive.
- Alerts
- 120
- Warnings
- 27
- Watches
- 18
- Advisories
- 52
- Busiest month
- August21 alerts
- Busiest day
- September 6, 20136 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, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 3 | 50% | 0 | ||
| Flash flood warnings | 0 | 1 | 0% |
Each office's whole area, 2013
| 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 | 35 | 16 | 54% | 51 | 59% | 17 min |
| NWS Missoula, MT: flash flood warnings | 8 | 0 | 100% | 4 | 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 6, 1:59 PM MST | Winter Weather Advisory | MSO | 39 hr |
| Jan 9, 9:01 AM MST | Winter Storm Watch | MSO | 4 hr |
| Jan 9, 11:43 AM MST | Winter Weather Advisory | MSO | 49 hr |
| Jan 9, 12:53 PM MST | Winter Storm Warning | MSO | 44 hr |
| Jan 13, 2:57 PM MST | Winter Weather Advisory | MSO | 29 hr |
| Jan 17, 7:25 AM MST | Dense Fog Advisory | MSO | 4 hr |
| Jan 17, 2:08 PM MST | Dense Fog Advisory | MSO | 22 hr |
| Jan 22, 7:10 AM MST | Dense Fog Advisory | MSO | 5 hr |
| Jan 23, 7:21 PM MST | Winter Weather Advisory | MSO | 14 hr |
| Jan 25, 2:17 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Jan 27, 2:18 PM MST | Winter Storm Watch | MSO | 13 hr |
| Jan 28, 3:25 AM MST | Winter Storm Warning | MSO | 54 hr |
| Jan 28, 3:25 AM MST | Winter Weather Advisory | MSO | 62 hr |
| Feb 9, 1:19 PM MST | Winter Weather Advisory | MSO | 22 hr |
| Feb 11, 1:32 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Feb 15, 12:21 PM MST | Winter Weather Advisory | MSO | 63 hr |
| Feb 22, 4:10 AM MST | Winter Weather Advisory | MSO | 40 hr |
| Feb 25, 8:47 AM MST | Winter Weather Advisory | MSO | 19 hr |
| Mar 1, 11:06 AM MST | Winter Weather Advisory | MSO | 46 hr |
| Mar 10, 2:35 PM MDT | Winter Weather Advisory | MSO | 21 hr |
| Mar 12, 7:59 AM MDT | Winter Weather Advisory | MSO | 4 hr |
| Mar 15, 2:15 PM MDT | Winter Weather Advisory | MSO | 4 days |
| Mar 19, 2:08 PM MDT | Winter Weather Advisory | MSO | 34 hr |
| Mar 20, 6:19 PM MDT | Special Weather Statement | MSO | 56 min |
| Mar 20, 7:00 PM MDT | Special Weather Statement | MSO | 60 min |
| Mar 20, 11:56 PM MDT | Winter Weather Advisory | MSO | 18 hr |
| Mar 22, 8:41 PM MDT | Winter Weather Advisory | MSO | 15 hr |
| Apr 6, 2:06 PM MDT | Winter Weather Advisory | MSO | 46 hr |
| Apr 12, 10:18 AM MDT | Wind Advisory | MSO | 35 hr |
| Apr 12, 10:33 AM MDT | Winter Weather Advisory | MSO | 25 hr |
| Apr 13, 2:11 PM MDT | Winter Weather Advisory | MSO | 22 hr |
| Apr 16, 8:37 PM MDT | Winter Weather Advisory | MSO | 3 hr |
| Apr 18, 2:30 PM MDT | Winter Weather Advisory | MSO | 18 hr |
| Apr 20, 3:31 AM MDT | Winter Weather Advisory | MSO | 53 hr |
| Apr 25, 1:14 PM MDT | Wind Advisory | MSO | 56 hr |
| Apr 28, 10:21 AM MDT | High Wind Warning | MSO | 35 hr |
| May 13, 8:08 AM MDT | Wind Advisory | MSO | 13 hr |
| May 13, 1:07 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 13, 2:57 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 13, 4:46 PM MDT | Severe Thunderstorm Warning | MSO | 44 min |
| May 13, 6:11 PM MDT | Severe Thunderstorm Warning | MSO | 49 min |
| May 13, 6:18 PM MDT | Mesoscale Discussion | SPC | 87 min |
| May 13, 8:09 PM MDT | Special Weather Statement | MSO | 51 min |
| May 22, 12:30 PM MDT | Winter Weather Advisory | MSO | 21 hr |
| May 23, 9:43 AM MDT | Winter Storm Warning | MSO | 19 hr |
| May 23, 11:56 AM MDT | Winter Weather Advisory | MSO | 16 hr |
| Jun 18, 1:55 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 2:37 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 18, 5:20 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 18, 8:21 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jun 28, 1:26 PM MDT | Heat Advisory | MSO | 4 days |
| Jun 29, 1:34 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 2, 7:42 PM MDT | Special Weather Statement | MSO | 48 min |
| Jul 8, 11:31 AM MDT | Special Weather Statement | MSO | 29 min |
| Jul 8, 12:05 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jul 10, 7:01 PM MDT | Special Weather Statement | MSO | 29 min |
| Jul 11, 4:52 PM MDT | Special Weather Statement | MSO | 23 min |
| Jul 17, 2:22 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jul 17, 2:48 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 17, 3:32 PM MDT | Severe Thunderstorm Warning | MSO | 43 min |
| Jul 25, 1:53 PM MDT | Fire Weather Watch | MSO | 21 hr |
| Jul 26, 11:08 AM MDT | Red Flag Warning | MSO | 34 hr |
| Aug 1, 12:46 PM MDT | Special Weather Statement | MSO | 59 min |
| Aug 1, 12:54 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Aug 1, 1:26 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Aug 8, 1:11 PM MDT | Red Flag Warning | MSO | 33 hr |
| Aug 9, 7:26 PM MDT | Severe Thunderstorm Warning | MSO | 34 min |
| Aug 9, 7:55 PM MDT | Severe Thunderstorm Warning | MSO | 50 min |
| Aug 9, 8:22 PM MDT | Areal Flood Advisory | MSO | 53 min |
| Aug 10, 3:27 AM MDT | Red Flag Warning | MSO | 18 hr |
| Aug 11, 3:24 AM MDT | Red Flag Warning | MSO | 18 hr |
| Aug 12, 3:51 AM MDT | Red Flag Warning | MSO | 16 hr |
| Aug 15, 12:31 PM MDT | Red Flag Warning | MSO | 32 hr |
| Aug 17, 2:20 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 19, 3:19 AM MDT | Red Flag Warning | MSO | 18 hr |
| Aug 21, 2:48 PM MDT | Fire Weather Watch | MSO | 19 hr |
| Aug 22, 5:07 AM MDT | Red Flag Warning | MSO | 33 hr |
| Aug 24, 12:03 PM MDT | Fire Weather Watch | MSO | 20 hr |
| Aug 25, 7:41 AM MDT | Red Flag Warning | MSO | 13 hr |
| Aug 25, 3:36 PM MDT | Special Weather Statement | MSO | 39 min |
| Aug 26, 6:39 PM MDT | Special Weather Statement | MSO | 51 min |
| Aug 29, 2:05 PM MDT | Red Flag Warning | MSO | 31 hr |
| Aug 29, 2:34 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Sep 5, 9:42 AM MDT | Flash Flood Watch | MSO | 11 hr |
| Sep 5, 1:14 PM MDT | Areal Flood Advisory | MSO | 3 hr |
| Sep 5, 7:05 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 5, 7:31 PM MDT | Severe Thunderstorm Warning | MSO | 44 min |
| Sep 5, 7:51 PM MDT | Areal Flood Advisory | MSO | 114 min |
| Sep 5, 8:13 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 5, 10:44 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 6, 2:09 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 23, 12:05 PM MDT | Winter Storm Watch | MSO | 24 hr |
| Sep 24, 11:50 AM MDT | Winter Storm Warning | MSO | 48 hr |
| Sep 27, 2:19 PM MDT | High Wind Watch | MSO | 24 hr |
| Sep 28, 2:27 PM MDT | High Wind Warning | MSO | 21 hr |
| Sep 28, 2:27 PM MDT | Wind Advisory | MSO | 21 hr |
| Sep 29, 1:54 PM MDT | Winter Weather Advisory | MSO | 21 hr |
| Oct 2, 10:59 AM MDT | Winter Weather Advisory | MSO | 33 hr |
| Oct 25, 12:34 PM MDT | Winter Storm Watch | MSO | 40 hr |
| Oct 26, 1:54 PM MDT | Winter Storm Warning | MSO | 67 hr |
| Oct 27, 4:07 AM MDT | Winter Weather Advisory | MSO | 38 hr |
| Oct 28, 11:54 AM MDT | Wind Chill Advisory | MSO | 21 hr |
| Nov 2, 3:18 AM MDT | Winter Weather Advisory | MSO | 57 hr |
| Nov 5, 10:55 PM MST | Winter Weather Advisory | MSO | 11 hr |
| Nov 6, 12:55 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Nov 7, 9:10 PM MST | High Wind Warning | MSO | 61 min |
| Nov 9, 3:46 AM MST | Winter Weather Advisory | MSO | 53 hr |
| Nov 13, 2:23 PM MST | Winter Storm Watch | MSO | 45 hr |
| Nov 14, 3:09 PM MST | Winter Weather Advisory | MSO | 4 days |
| Nov 29, 2:38 PM MST | Winter Storm Watch | MSO | 48 hr |
| Nov 30, 3:03 PM MST | Winter Storm Warning | MSO | 68 hr |
| Dec 3, 11:13 AM MST | Wind Chill Advisory | MSO | 24 hr |
| Dec 4, 2:12 PM MST | Wind Chill Watch | MSO | 14 hr |
| Dec 5, 4:35 AM MST | Wind Chill Warning | MSO | 60 hr |
| Dec 8, 1:58 PM MST | Winter Weather Advisory | MSO | 51 hr |
| Dec 17, 12:24 PM MST | Winter Weather Advisory | MSO | 47 hr |
| Dec 19, 10:59 AM MST | Winter Storm Warning | MSO | 48 hr |
| Dec 19, 10:59 AM MST | Winter Weather Advisory | MSO | 48 hr |
| Dec 22, 1:59 PM MST | Winter Weather Advisory | MSO | 39 hr |
| Dec 30, 1:51 PM MST | Winter Weather Advisory | MSO | 33 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 | 6 |
| Severe Thunderstorm Watch | 6 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 10 |
| Flooding | |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 7 |
| Winter Storm Watch | 6 |
| Winter Weather Advisory | 39 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Wind Chill Warning | 1 |
| Wind Chill Watch | 1 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 10 |
| Fire Weather Watch | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20122014
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.