Alert archive / Montana / Granite County
Weather alerts in Granite County, Montana, 2019
144 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 144
- Warnings
- 33
- Watches
- 12
- Advisories
- 66
- Busiest month
- February30 alerts
- Busiest day
- August 10, 201910 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, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 3 | 63% | 1 | 100% | 12 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 35 | 14 | 60% | 52 | 35% | 9 min |
| NWS Missoula, MT: flash flood warnings | 1 | 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, 3:36 AM MST | Winter Weather Advisory | MSO | 46 hr |
| Jan 6, 6:35 AM MST | Winter Weather Advisory | MSO | 7 hr |
| Jan 9, 9:16 PM MST | Winter Weather Advisory | MSO | 13 hr |
| Jan 11, 6:12 AM MST | Freezing Fog Advisory | MSO | 5 hr |
| Jan 16, 1:16 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Jan 19, 1:24 PM MST | Winter Weather Advisory | MSO | 43 hr |
| Jan 22, 10:02 AM MST | Winter Weather Advisory | MSO | 32 hr |
| Jan 24, 12:16 AM MST | Winter Weather Advisory | MSO | 9 hr |
| Jan 27, 4:28 PM MST | Winter Weather Advisory | MSO | 8 hr |
| Jan 31, 2:50 PM MST | Winter Storm Watch | MSO | 44 hr |
| Feb 2, 10:51 AM MST | Winter Storm Warning | MSO | 48 hr |
| Feb 3, 2:00 PM MST | Blizzard Warning | MSO | 7 hr |
| Feb 3, 8:49 PM MST | Wind Chill Warning | MSO | 14 hr |
| Feb 4, 11:05 AM MST | Wind Chill Warning | MSO | 6 hr |
| Feb 4, 11:05 AM MST | Wind Chill Advisory | MSO | 24 hr |
| Feb 4, 7:58 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Feb 7, 11:19 AM MST | Winter Storm Watch | MSO | 23 hr |
| Feb 7, 11:19 AM MST | Winter Weather Advisory | MSO | 3 days |
| Feb 8, 10:19 AM MST | Winter Storm Warning | MSO | 17 hr |
| Feb 9, 3:37 AM MST | Winter Weather Advisory | MSO | 6 hr |
| Feb 9, 9:09 AM MST | Wind Chill Advisory | MSO | 23 hr |
| Feb 10, 2:57 PM MST | Winter Storm Watch | MSO | 20 hr |
| Feb 10, 2:57 PM MST | Winter Weather Advisory | MSO | 42 hr |
| Feb 11, 11:08 AM MST | Winter Storm Warning | MSO | 54 hr |
| Feb 11, 12:09 PM MST | Snow Squall Warning | MSO | 51 min |
| Feb 12, 5:15 PM MST | Winter Weather Advisory | MSO | 39 hr |
| Feb 14, 10:43 AM MST | Winter Weather Advisory | MSO | 46 hr |
| Feb 15, 12:02 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Feb 16, 9:07 AM MST | Winter Weather Advisory | MSO | 48 hr |
| Feb 16, 10:54 PM MST | Special Weather Statement | MSO | 66 min |
| Feb 17, 8:17 AM MST | Wind Chill Advisory | MSO | 20 hr |
| Feb 18, 3:03 PM MST | Winter Weather Advisory | MSO | 47 hr |
| Feb 20, 2:27 PM MST | Winter Weather Advisory | MSO | 17 hr |
| Feb 23, 7:45 AM MST | Winter Weather Advisory | MSO | 3 days |
| Feb 23, 1:45 PM MST | Winter Storm Watch | MSO | 38 hr |
| Feb 24, 2:20 PM MST | Winter Storm Warning | MSO | 45 hr |
| Feb 24, 8:08 PM MST | Snow Squall Warning | MSO | 67 min |
| Feb 27, 6:17 AM MST | Winter Weather Advisory | MSO | 14 hr |
| Feb 27, 8:20 PM MST | Winter Weather Advisory | MSO | 25 hr |
| Feb 28, 1:59 PM MST | Winter Storm Watch | MSO | 22 hr |
| Mar 1, 3:33 AM MST | Winter Storm Warning | MSO | 30 hr |
| Mar 1, 11:38 AM MST | Winter Weather Advisory | MSO | 22 hr |
| Mar 1, 2:48 PM MST | Wind Chill Watch | MSO | 19 hr |
| Mar 1, 6:44 PM MST | Special Weather Statement | MSO | 31 min |
| Mar 2, 9:44 AM MST | Wind Chill Warning | MSO | 25 hr |
| Mar 3, 2:37 PM MST | Extreme Cold Warning | MSO | 20 hr |
| Mar 6, 2:00 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Mar 7, 11:09 AM MST | Winter Weather Advisory | MSO | 7 min |
| Mar 7, 11:44 AM MST | Winter Weather Advisory | MSO | 3 hr |
| Mar 12, 2:07 PM MDT | Winter Weather Advisory | MSO | 22 hr |
| Mar 26, 2:42 PM MDT | Winter Weather Advisory | MSO | 45 hr |
| Apr 8, 9:40 AM MDT | Areal Flood Advisory | MSO | 36 hr |
| Apr 9, 11:44 AM MDT | Winter Weather Advisory | MSO | 24 hr |
| Apr 13, 2:02 PM MDT | Winter Weather Advisory | MSO | 19 hr |
| Apr 15, 7:40 PM MDT | Winter Weather Advisory | MSO | 16 hr |
| Apr 26, 1:06 PM MDT | Wind Advisory | MSO | 41 hr |
| Apr 28, 7:13 AM MDT | Winter Weather Advisory | MSO | 5 hr |
| Apr 28, 8:31 AM MDT | Special Weather Statement | MSO | 29 min |
| Apr 29, 3:44 AM MDT | Winter Weather Advisory | MSO | 23 hr |
| May 16, 5:01 PM MDT | Special Weather Statement | MSO | 44 min |
| May 17, 7:42 PM MDT | Winter Weather Advisory | MSO | 14 hr |
| May 26, 2:43 PM MDT | Special Weather Statement | MSO | 32 min |
| May 26, 4:17 PM MDT | Special Weather Statement | MSO | 43 min |
| Jun 6, 8:38 AM MDT | Wind Advisory | MSO | 13 hr |
| Jun 6, 9:11 PM MDT | Special Weather Statement | MSO | 49 min |
| Jun 18, 11:40 AM MDT | Wind Advisory | MSO | 33 hr |
| Jun 19, 1:43 PM MDT | Winter Weather Advisory | MSO | 21 hr |
| Jun 26, 2:23 PM MDT | Special Weather Statement | MSO | 37 min |
| Jun 26, 2:24 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jun 26, 2:46 PM MDT | Special Weather Statement | MSO | 29 min |
| Jun 26, 3:34 PM MDT | Severe Thunderstorm Warning | MSO | 26 min |
| Jun 27, 12:31 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jun 27, 12:48 PM MDT | Special Weather Statement | MSO | 27 min |
| Jun 27, 1:06 PM MDT | Severe Thunderstorm Warning | MSO | 24 min |
| Jul 3, 8:57 AM MDT | Special Weather Statement | MSO | 33 min |
| Jul 6, 12:14 AM MDT | Special Weather Statement | MSO | 46 min |
| Jul 6, 3:52 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 6, 8:57 PM MDT | Special Weather Statement | MSO | 33 min |
| Jul 13, 1:01 PM MDT | Special Weather Statement | MSO | 29 min |
| Jul 13, 4:36 PM MDT | Special Weather Statement | MSO | 24 min |
| Jul 13, 8:16 PM MDT | Special Weather Statement | MSO | 29 min |
| Jul 13, 8:43 PM MDT | Severe Thunderstorm Warning | MSO | 32 min |
| Jul 13, 9:13 PM MDT | Severe Thunderstorm Warning | MSO | 32 min |
| Jul 13, 9:25 PM MDT | Special Weather Statement | MSO | 35 min |
| Jul 13, 10:08 PM MDT | Special Weather Statement | MSO | 37 min |
| Jul 13, 10:47 PM MDT | Severe Thunderstorm Warning | MSO | 28 min |
| Jul 13, 11:12 PM MDT | Severe Thunderstorm Warning | MSO | 26 min |
| Jul 14, 2:10 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 14, 2:23 PM MDT | Special Weather Statement | MSO | 52 min |
| Jul 15, 4:10 PM MDT | Special Weather Statement | MSO | 20 min |
| Jul 15, 4:18 PM MDT | Special Weather Statement | MSO | 27 min |
| Jul 23, 4:13 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 2:12 PM MDT | Red Flag Warning | MSO | 31 hr |
| Jul 30, 5:13 AM MDT | Red Flag Warning | MSO | 16 hr |
| Jul 31, 4:47 AM MDT | Red Flag Warning | MSO | 16 hr |
| Aug 1, 2:31 PM MDT | Red Flag Warning | MSO | 32 hr |
| Aug 2, 5:37 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Aug 7, 2:29 PM MDT | Fire Weather Watch | MSO | 13 hr |
| Aug 8, 3:12 AM MDT | Red Flag Warning | MSO | 18 hr |
| Aug 9, 2:23 PM MDT | Flash Flood Watch | MSO | 32 hr |
| Aug 10, 11:41 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 1:36 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 10, 3:36 PM MDT | Special Weather Statement | MSO | 24 min |
| Aug 10, 3:54 PM MDT | Severe Thunderstorm Warning | MSO | 36 min |
| Aug 10, 4:02 PM MDT | Special Weather Statement | MSO | 28 min |
| Aug 10, 4:09 PM MDT | Special Weather Statement | MSO | 36 min |
| Aug 10, 4:29 PM MDT | Special Weather Statement | MSO | 31 min |
| Aug 10, 4:30 PM MDT | Areal Flood Advisory | MSO | 2 hr |
| Aug 10, 4:38 PM MDT | Severe Thunderstorm Warning | MSO | 22 min |
| Aug 10, 4:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 3, 1:44 PM MDT | Red Flag Warning | MSO | 30 hr |
| Sep 24, 2:03 PM MDT | Winter Storm Watch | MSO | 5 days |
| Sep 26, 2:33 PM MDT | Winter Storm Warning | MSO | 3 days |
| Oct 6, 2:41 PM MDT | Winter Storm Watch | MSO | 33 hr |
| Oct 7, 2:55 PM MDT | Winter Storm Warning | MSO | 44 hr |
| Oct 7, 11:17 PM MDT | Winter Weather Advisory | MSO | 49 hr |
| Oct 18, 12:22 PM MDT | Winter Weather Advisory | MSO | 45 hr |
| Oct 20, 2:16 PM MDT | Winter Weather Advisory | MSO | 21 hr |
| Oct 22, 2:02 AM MDT | Wind Advisory | MSO | 17 hr |
| Oct 22, 4:24 AM MDT | Winter Weather Advisory | MSO | 4 hr |
| Oct 24, 2:29 PM MDT | Wind Advisory | MSO | 31 hr |
| Oct 24, 2:31 PM MDT | Winter Weather Advisory | MSO | 46 hr |
| Oct 27, 2:51 PM MDT | Winter Weather Advisory | MSO | 36 hr |
| Oct 28, 9:58 AM MDT | Wind Chill Advisory | MSO | 26 hr |
| Oct 28, 9:58 AM MDT | Winter Storm Warning | MSO | 11 hr |
| Nov 8, 12:27 PM MST | Winter Storm Watch | MSO | 39 hr |
| Nov 8, 12:27 PM MST | Winter Weather Advisory | MSO | 58 hr |
| Nov 10, 9:28 AM MST | Winter Storm Warning | MSO | 11 hr |
| Nov 12, 11:41 AM MST | Winter Weather Advisory | MSO | 12 hr |
| Nov 18, 1:45 PM MST | Winter Weather Advisory | MSO | 39 hr |
| Nov 25, 11:51 AM MST | Winter Weather Advisory | MSO | 23 hr |
| Nov 26, 12:27 PM MST | Wind Advisory | MSO | 29 hr |
| Nov 27, 4:01 AM MST | Winter Weather Advisory | MSO | 17 hr |
| Nov 28, 4:00 AM MST | Winter Weather Advisory | MSO | 9 hr |
| Nov 28, 1:48 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Dec 6, 2:15 PM MST | Winter Weather Advisory | MSO | 52 hr |
| Dec 11, 3:31 AM MST | Winter Weather Advisory | MSO | 55 hr |
| Dec 13, 1:54 PM MST | Winter Weather Advisory | MSO | 23 hr |
| Dec 14, 1:52 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Dec 14, 7:38 PM MST | Snow Squall Warning | MSO | 52 min |
| Dec 15, 5:39 PM MST | Snow Squall Warning | MSO | 36 min |
| Dec 15, 6:15 PM MST | Snow Squall Warning | MSO | 30 min |
| Dec 19, 1:27 PM MST | Winter Weather Advisory | MSO | 19 hr |
| Dec 30, 2:26 PM MST | Winter Weather Advisory | MSO | 69 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 | 8 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 8 |
| Special Weather Statement | 25 |
| Flooding | |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Blizzard Warning | 1 |
| Snow Squall Warning | 5 |
| Winter Storm Warning | 9 |
| Winter Storm Watch | 8 |
| Winter Weather Advisory | 53 |
| Cold | |
| Extreme Cold Warning | 1 |
| Wind Chill Warning | 3 |
| Wind Chill Watch | 1 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 6 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.