Alert archive / Montana / Fallon County
Weather alerts in Fallon County, Montana, 2025
132 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Fallon County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 132
- Warnings
- 37
- Watches
- 18
- Advisories
- 23
- Busiest month
- July45 alerts
- Busiest day
- July 20, 20258 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Fallon County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 29 | 12 | 59% | 18 | 61% | 30 min |
| 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 Billings, MT: tornado warnings | 4 | 1 | 75% | 1 | 100% | 2 min |
| NWS Billings, MT: severe thunderstorm warnings | 260 | 77 | 70% | 213 | 67% | 27 min |
| NWS Billings, MT: flash flood warnings | 20 | 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 2, 1:09 AM MST | Winter Weather Advisory | BYZ | 3 days |
| Jan 2, 1:42 PM MST | Winter Storm Watch | BYZ | 25 hr |
| Jan 8, 3:13 AM MST | Winter Weather Advisory | BYZ | 24 hr |
| Jan 9, 1:14 PM MST | Winter Storm Watch | BYZ | 26 hr |
| Jan 10, 3:06 PM MST | Winter Weather Advisory | BYZ | 52 hr |
| Jan 13, 3:36 PM MST | Special Weather Statement | BYZ | 114 min |
| Jan 18, 1:28 AM MST | Cold Weather Advisory | BYZ | 3 days |
| Jan 19, 1:40 PM MST | Cold Weather Advisory | BYZ | 38 hr |
| Jan 19, 1:40 PM MST | Extreme Cold Warning | BYZ | 22 hr |
| Jan 21, 2:17 AM MST | Winter Weather Advisory | BYZ | 51 hr |
| Feb 2, 3:14 AM MST | Winter Weather Advisory | BYZ | 41 hr |
| Feb 2, 8:31 PM MST | Cold Weather Advisory | BYZ | 38 hr |
| Feb 6, 1:54 AM MST | Winter Weather Advisory | BYZ | 46 hr |
| Feb 10, 1:25 AM MST | Extreme Cold Warning | BYZ | 34 hr |
| Feb 11, 2:48 PM MST | Cold Weather Advisory | BYZ | 21 hr |
| Feb 12, 2:10 PM MST | Cold Weather Advisory | BYZ | 20 hr |
| Feb 15, 1:53 PM MST | Cold Weather Advisory | BYZ | 22 hr |
| Feb 16, 1:50 PM MST | Extreme Cold Warning | BYZ | 69 hr |
| Feb 19, 11:14 AM MST | Cold Weather Advisory | BYZ | 25 hr |
| Mar 9, 2:18 PM MDT | Red Flag Warning | BYZ | 29 hr |
| Apr 3, 5:46 PM MDT | Special Weather Statement | BYZ | 59 min |
| Apr 12, 7:28 PM MDT | Special Weather Statement | BYZ | 47 min |
| Apr 13, 2:29 AM MDT | High Wind Warning | BYZ | 16 hr |
| Apr 27, 5:34 AM MDT | Dense Fog Advisory | BYZ | 4 hr |
| Apr 27, 4:34 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 27, 8:30 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Apr 27, 8:40 PM MDT | Severe Thunderstorm Warning | BYZ | 80 min |
| May 11, 3:57 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 11, 4:28 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 11, 6:51 PM MDT | Special Weather Statement | BYZ | 24 min |
| May 11, 7:23 PM MDT | Mesoscale Discussion | SPC | 97 min |
| May 16, 2:16 AM MDT | High Wind Warning | BYZ | 11 hr |
| Jun 13, 8:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 13, 9:41 PM MDT | Severe Thunderstorm Warning | BYZ | 49 min |
| Jun 13, 10:18 PM MDT | Severe Thunderstorm Warning | BYZ | 12 min |
| Jun 13, 10:27 PM MDT | Severe Thunderstorm Warning | BYZ | 33 min |
| Jun 15, 1:13 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 2:15 PM MDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Jun 15, 4:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 15, 9:47 PM MDT | Severe Thunderstorm Warning | BYZ | 58 min |
| Jun 15, 10:44 PM MDT | Severe Thunderstorm Warning | BYZ | 46 min |
| Jun 15, 10:58 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Jun 16, 12:39 AM MDT | Severe Thunderstorm Warning | BYZ | 66 min |
| Jun 20, 2:24 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 2:46 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 20, 4:01 PM MDT | Severe Thunderstorm Warning | BYZ | 59 min |
| Jun 20, 4:52 PM MDT | Severe Thunderstorm Warning | BYZ | 53 min |
| Jun 20, 4:58 PM MDT | Special Weather Statement | BYZ | 47 min |
| Jun 20, 5:14 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jun 25, 3:21 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 25, 4:20 PM MDT | Special Weather Statement | BYZ | 40 min |
| Jun 25, 4:57 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Jun 25, 5:11 PM MDT | Special Weather Statement | BYZ | 49 min |
| Jun 25, 5:54 PM MDT | Special Weather Statement | BYZ | 66 min |
| Jun 26, 7:12 AM MDT | Special Weather Statement | BYZ | 48 min |
| Jul 3, 12:37 AM MDT | Special Weather Statement | BYZ | 38 min |
| Jul 3, 2:35 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 3, 9:52 PM MDT | Severe Thunderstorm Warning | BYZ | 23 min |
| Jul 5, 12:51 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 5, 2:14 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 1:27 AM MDT | Heat Advisory | BYZ | 44 hr |
| Jul 17, 8:48 PM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 17, 10:41 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jul 17, 11:44 PM MDT | Special Weather Statement | BYZ | 61 min |
| Jul 19, 2:46 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jul 19, 4:10 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 19, 6:30 PM MDT | Severe Thunderstorm Warning | BYZ | 60 min |
| Jul 19, 7:22 PM MDT | Severe Thunderstorm Warning | BYZ | 53 min |
| Jul 19, 7:59 PM MDT | Severe Thunderstorm Warning | BYZ | 46 min |
| Jul 19, 8:11 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Jul 19, 8:12 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Jul 19, 9:14 PM MDT | Severe Thunderstorm Warning | BYZ | 44 min |
| Jul 20, 3:45 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jul 20, 4:09 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 20, 6:31 PM MDT | Severe Thunderstorm Warning | BYZ | 48 min |
| Jul 20, 6:55 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jul 20, 7:17 PM MDT | Severe Thunderstorm Warning | BYZ | 58 min |
| Jul 20, 8:12 PM MDT | Severe Thunderstorm Warning | BYZ | 33 min |
| Jul 20, 9:51 PM MDT | Severe Thunderstorm Warning | BYZ | 54 min |
| Jul 21, 1:59 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 3:34 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 21, 5:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 7:09 PM MDT | Special Weather Statement | BYZ | 36 min |
| Jul 22, 2:04 AM MDT | Special Weather Statement | BYZ | 56 min |
| Jul 25, 3:47 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 25, 5:27 PM MDT | Special Weather Statement | BYZ | 63 min |
| Jul 25, 5:43 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 25, 5:52 PM MDT | Severe Thunderstorm Warning | BYZ | 53 min |
| Jul 25, 6:38 PM MDT | Severe Thunderstorm Warning | BYZ | 37 min |
| Jul 26, 4:34 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 26, 6:52 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 12:43 AM MDT | Special Weather Statement | BYZ | 32 min |
| Jul 27, 10:24 AM MDT | Special Weather Statement | BYZ | 36 min |
| Jul 28, 4:02 AM MDT | Mesoscale Discussion | SPC | 118 min |
| Jul 28, 8:22 AM MDT | Severe Thunderstorm Warning | BYZ | 53 min |
| Jul 28, 9:13 AM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Jul 28, 9:42 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 10:55 AM MDT | Special Weather Statement | BYZ | 35 min |
| Jul 28, 11:48 PM MDT | Severe Thunderstorm Warning | BYZ | 29 min |
| Jul 29, 2:28 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 1, 12:04 AM MDT | Special Weather Statement | BYZ | 41 min |
| Aug 7, 2:03 AM MDT | Special Weather Statement | BYZ | 42 min |
| Aug 7, 2:49 AM MDT | Special Weather Statement | BYZ | 56 min |
| Aug 7, 3:50 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 7, 6:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 9:00 PM MDT | Severe Thunderstorm Warning | BYZ | 75 min |
| Aug 7, 9:28 PM MDT | Severe Thunderstorm Warning | BYZ | 47 min |
| Aug 7, 9:30 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 10:10 PM MDT | Severe Thunderstorm Warning | BYZ | 22 min |
| Aug 18, 1:37 PM MDT | Heat Advisory | BYZ | 55 hr |
| Aug 19, 6:08 PM MDT | Special Weather Statement | BYZ | 37 min |
| Sep 1, 5:15 AM MDT | Special Weather Statement | BYZ | 3 hr |
| Sep 11, 12:19 AM MDT | Special Weather Statement | BYZ | 56 min |
| Sep 11, 1:09 AM MDT | Special Weather Statement | BYZ | 51 min |
| Sep 11, 2:10 AM MDT | Special Weather Statement | BYZ | 65 min |
| Sep 12, 10:27 PM MDT | Special Weather Statement | BYZ | 33 min |
| Sep 12, 10:59 PM MDT | Special Weather Statement | BYZ | 46 min |
| Oct 19, 12:10 PM MDT | High Wind Watch | BYZ | 14 hr |
| Nov 8, 12:14 AM MST | Special Weather Statement | BYZ | 2 hr |
| Nov 24, 1:48 AM MST | Winter Weather Advisory | BYZ | 33 hr |
| Nov 27, 1:07 PM MST | Winter Weather Advisory | BYZ | 43 hr |
| Dec 7, 1:17 AM MST | High Wind Watch | BYZ | 36 hr |
| Dec 8, 1:10 AM MST | High Wind Warning | BYZ | 38 hr |
| Dec 8, 2:08 PM MST | Winter Weather Advisory | BYZ | 58 hr |
| Dec 9, 4:18 PM MST | Winter Storm Watch | BYZ | 46 hr |
| Dec 11, 2:22 AM MST | Winter Weather Advisory | BYZ | 54 hr |
| Dec 16, 3:05 AM MST | High Wind Watch | BYZ | 11 hr |
| Dec 16, 1:43 PM MST | High Wind Warning | BYZ | 39 hr |
| Dec 17, 1:45 PM MST | Winter Weather Advisory | BYZ | 18 hr |
| Dec 19, 3:17 AM MST | Winter Weather Advisory | BYZ | 6 hr |
| Dec 22, 7:40 AM MST | Special Weather Statement | BYZ | 95 min |
| Dec 27, 12:51 AM MST | Cold Weather Advisory | BYZ | 37 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 | 29 |
| Severe Thunderstorm Watch | 12 |
| Mesoscale Discussion | 25 |
| Special Weather Statement | 29 |
| Winter | |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 12 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Extreme Cold Warning | 3 |
| Cold Weather Advisory | 8 |
| Wind and dust | |
| High Wind Warning | 4 |
| High Wind Watch | 3 |
| Fire | |
| Red Flag Warning | 1 |
| 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 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.