Alert archive / Montana / Granite County
Weather alerts in Granite County, Montana, 2025
111 weather alerts in 2025, 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 2025. Tap one for its archive.
- Alerts
- 111
- Warnings
- 16
- Watches
- 16
- Advisories
- 55
- Busiest month
- December19 alerts
- Busiest day
- July 28, 20255 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, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 0 | 100% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 9 | 2 | 78% | 12 | 17% | 21 min |
| NWS Missoula, MT: flash flood warnings | 3 | 0 | 100% | 8 | 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 | 46 hr |
| Jan 4, 12:41 PM MST | Winter Weather Advisory | MSO | 40 hr |
| Jan 8, 7:58 AM MST | Special Weather Statement | MSO | 77 min |
| Jan 10, 8:12 AM MST | Winter Weather Advisory | MSO | 42 hr |
| Jan 16, 10:47 AM MST | Winter Weather Advisory | MSO | 48 hr |
| Jan 17, 12:12 PM MST | Cold Weather Advisory | MSO | 71 hr |
| Jan 17, 12:12 PM MST | Extreme Cold Warning | MSO | 71 hr |
| Jan 18, 11:10 AM MST | Winter Weather Advisory | MSO | 30 hr |
| Jan 23, 12:25 PM MST | Winter Weather Advisory | MSO | 35 hr |
| Jan 25, 9:43 AM MST | Air Stagnation Advisory | MSO | 6 days |
| Jan 29, 1:01 PM MST | Winter Storm Watch | MSO | 5 days |
| Jan 30, 11:43 AM MST | Winter Storm Warning | MSO | 50 hr |
| Jan 30, 11:43 AM MST | Winter Weather Advisory | MSO | 50 hr |
| Feb 1, 2:30 PM MST | Winter Weather Advisory | MSO | 4 days |
| Feb 2, 1:18 PM MST | Winter Storm Warning | MSO | 70 hr |
| Feb 6, 2:13 PM MST | Winter Storm Warning | MSO | 23 hr |
| Feb 6, 2:20 PM MST | Winter Weather Advisory | MSO | 30 hr |
| Feb 10, 9:50 AM MST | Cold Weather Advisory | MSO | 3 days |
| Feb 13, 12:15 PM MST | Winter Weather Advisory | MSO | 47 hr |
| Feb 15, 1:19 PM MST | Winter Storm Watch | MSO | 24 hr |
| Feb 15, 1:19 PM MST | Winter Storm Warning | MSO | 68 hr |
| Feb 15, 1:19 PM MST | Winter Weather Advisory | MSO | 68 hr |
| Feb 18, 12:24 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Feb 20, 12:38 PM MST | Flood Watch | MSO | 4 days |
| Feb 21, 1:17 PM MST | Winter Weather Advisory | MSO | 43 hr |
| Feb 23, 8:20 PM MST | Winter Weather Advisory | MSO | 12 hr |
| Feb 24, 12:54 PM MST | Winter Weather Advisory | MSO | 34 hr |
| Feb 25, 12:20 AM MST | Snow Squall Warning | MSO | 25 min |
| Mar 4, 1:22 AM MST | Winter Weather Advisory | MSO | 7 hr |
| Mar 15, 2:03 PM MDT | Winter Weather Advisory | MSO | 43 hr |
| Mar 15, 2:03 PM MDT | Winter Weather Advisory | MSO | 6 min |
| Mar 20, 9:56 AM MDT | Winter Weather Advisory | MSO | 50 hr |
| Mar 21, 1:16 PM MDT | Wind Advisory | MSO | 29 hr |
| Mar 28, 10:30 AM MDT | Winter Storm Watch | MSO | 23 hr |
| Mar 29, 9:33 AM MDT | Winter Weather Advisory | MSO | 23 hr |
| Mar 31, 2:47 AM MDT | Winter Weather Advisory | MSO | 45 hr |
| Apr 2, 1:24 AM MDT | Winter Weather Advisory | MSO | 8 hr |
| Apr 15, 2:33 PM MDT | Winter Weather Advisory | MSO | 42 hr |
| May 5, 2:24 AM MDT | Winter Weather Advisory | MSO | 7 hr |
| May 5, 9:18 AM MDT | Winter Weather Advisory | MSO | 6 hr |
| May 10, 1:48 PM MDT | Wind Advisory | MSO | 7 hr |
| May 10, 2:26 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 10, 2:30 PM MDT | Special Weather Statement | MSO | 45 min |
| May 11, 12:39 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| May 16, 1:24 PM MDT | Winter Storm Watch | MSO | 24 hr |
| May 17, 1:13 PM MDT | Winter Storm Warning | MSO | 19 hr |
| May 17, 1:13 PM MDT | Winter Weather Advisory | MSO | 29 hr |
| May 26, 9:19 PM MDT | Special Weather Statement | MSO | 26 min |
| May 29, 6:43 PM MDT | Special Weather Statement | MSO | 47 min |
| Jun 11, 1:57 PM MDT | Mesoscale Discussion | SPC | 63 min |
| Jun 12, 4:04 PM MDT | Special Weather Statement | MSO | 26 min |
| Jun 16, 2:47 PM MDT | Special Weather Statement | MSO | 28 min |
| Jun 20, 12:17 PM MDT | Winter Weather Advisory | MSO | 48 hr |
| Jun 20, 12:32 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 26, 2:58 PM MDT | Flash Flood Watch | MSO | 4 hr |
| Jun 26, 3:18 PM MDT | Special Weather Statement | MSO | 27 min |
| Jul 4, 5:21 PM MDT | Special Weather Statement | MSO | 39 min |
| Jul 13, 12:39 PM MDT | Wind Advisory | MSO | 49 hr |
| Jul 25, 4:43 PM MDT | Special Weather Statement | MSO | 47 min |
| Jul 25, 5:10 PM MDT | Special Weather Statement | MSO | 35 min |
| Jul 27, 6:07 PM MDT | Special Weather Statement | MSO | 38 min |
| Jul 27, 6:42 PM MDT | Special Weather Statement | MSO | 48 min |
| Jul 27, 7:04 PM MDT | Special Weather Statement | MSO | 26 min |
| Jul 27, 7:38 PM MDT | Special Weather Statement | MSO | 52 min |
| Jul 28, 1:02 PM MDT | Flood Watch | MSO | 32 hr |
| Jul 30, 11:06 AM MDT | Flood Watch | MSO | 34 hr |
| Jul 31, 5:28 PM MDT | Severe Thunderstorm Warning | MSO | 32 min |
| Jul 31, 5:56 PM MDT | Areal Flood Advisory | MSO | 2 hr |
| Aug 4, 8:42 AM MDT | Flood Watch | MSO | 11 hr |
| Aug 4, 3:20 PM MDT | Special Weather Statement | MSO | 25 min |
| Aug 4, 3:40 PM MDT | Severe Thunderstorm Warning | MSO | 50 min |
| Aug 4, 3:54 PM MDT | Severe Thunderstorm Warning | MSO | 36 min |
| Aug 7, 10:10 AM MDT | Flash Flood Watch | MSO | 10 hr |
| Aug 11, 12:26 PM MDT | Fire Weather Watch | MSO | 25 hr |
| Aug 12, 12:57 PM MDT | Red Flag Warning | MSO | 33 hr |
| Aug 19, 7:14 PM MDT | Special Weather Statement | MSO | 31 min |
| Sep 14, 2:10 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 14, 5:34 PM MDT | Special Weather Statement | MSO | 41 min |
| Sep 14, 6:08 PM MDT | Special Weather Statement | MSO | 37 min |
| Oct 3, 12:15 PM MDT | Winter Weather Advisory | MSO | 46 hr |
| Oct 9, 12:16 PM MDT | Winter Storm Watch | MSO | 49 hr |
| Oct 10, 12:47 PM MDT | Winter Weather Advisory | MSO | 71 hr |
| Oct 18, 12:50 PM MDT | Winter Weather Advisory | MSO | 44 hr |
| Oct 24, 2:28 PM MDT | Winter Weather Advisory | MSO | 70 hr |
| Oct 24, 2:52 PM MDT | Winter Weather Advisory | MSO | 44 hr |
| Nov 3, 8:13 PM MST | Winter Weather Advisory | MSO | 13 hr |
| Nov 22, 12:32 PM MST | Winter Weather Advisory | MSO | 58 hr |
| Nov 25, 1:11 PM MST | Winter Storm Watch | MSO | 47 hr |
| Nov 25, 1:11 PM MST | Winter Weather Advisory | MSO | 22 hr |
| Nov 26, 11:33 AM MST | Winter Weather Advisory | MSO | 53 hr |
| Nov 27, 11:45 AM MST | Winter Storm Warning | MSO | 30 hr |
| Nov 30, 12:05 PM MST | Winter Weather Advisory | MSO | 59 hr |
| Dec 3, 1:26 PM MST | Winter Storm Watch | MSO | 46 hr |
| Dec 4, 1:02 PM MST | Winter Storm Warning | MSO | 45 hr |
| Dec 4, 1:02 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Dec 9, 12:42 AM MST | Winter Weather Advisory | MSO | 34 hr |
| Dec 10, 1:16 AM MST | Wind Advisory | MSO | 42 hr |
| Dec 14, 1:43 PM MST | High Wind Watch | MSO | 45 hr |
| Dec 15, 1:50 AM MST | Wind Advisory | MSO | 30 hr |
| Dec 16, 10:26 AM MST | High Wind Warning | MSO | 34 hr |
| Dec 16, 11:47 AM MST | Winter Storm Watch | MSO | 25 hr |
| Dec 17, 10:47 AM MST | Special Weather Statement | MSO | 58 min |
| Dec 17, 12:43 PM MST | Winter Weather Advisory | MSO | 70 hr |
| Dec 18, 12:26 AM MST | Winter Storm Warning | MSO | 41 hr |
| Dec 18, 11:21 AM MST | Wind Advisory | MSO | 24 hr |
| Dec 21, 2:40 AM MST | Winter Weather Advisory | MSO | 32 hr |
| Dec 22, 1:21 PM MST | Winter Weather Advisory | MSO | 25 hr |
| Dec 25, 8:05 AM MST | Dense Fog Advisory | MSO | 5 hr |
| Dec 25, 1:45 PM MST | Winter Weather Advisory | MSO | 54 hr |
| Dec 25, 1:52 PM MST | Wind Advisory | MSO | 39 hr |
| Dec 27, 9:17 AM MST | Snow Squall Warning | MSO | 32 min |
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 | 3 |
| Mesoscale Discussion | 5 |
| Special Weather Statement | 19 |
| Flooding | |
| Flash Flood Watch | 2 |
| Flood Watch | 4 |
| Areal Flood Advisory | 1 |
| Winter | |
| Snow Squall Warning | 2 |
| Winter Storm Warning | 8 |
| Winter Storm Watch | 8 |
| Winter Weather Advisory | 43 |
| Cold | |
| Extreme Cold Warning | 1 |
| Cold Weather Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Air Stagnation Advisory | 1 |
| Dense Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
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.