Alert archive / Montana / Custer County
Weather alerts in Custer County, Montana, 2023
107 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Custer County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 107
- Warnings
- 19
- Watches
- 13
- Advisories
- 29
- Busiest month
- May29 alerts
- Busiest day
- May 24, 20238 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Custer County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 6 | 54% | 13 | 69% | 24 min |
| Flash flood warnings | 3 | 0 | 100% | 2 | 0% |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Billings, MT: severe thunderstorm warnings | 85 | 22 | 74% | 85 | 48% | 22 min |
| NWS Billings, MT: flash flood warnings | 43 | 11 | 74% | 21 | 52% | 78 min |
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 3, 12:56 AM MST | Dense Fog Advisory | BYZ | 32 hr |
| Jan 11, 1:45 AM MST | Dense Fog Advisory | BYZ | 33 hr |
| Jan 15, 10:33 PM MST | Dense Fog Advisory | BYZ | 12 hr |
| Jan 16, 4:49 PM MST | Dense Fog Advisory | BYZ | 16 hr |
| Jan 17, 6:30 PM MST | Dense Fog Advisory | BYZ | 15 hr |
| Jan 26, 2:20 PM MST | Winter Weather Advisory | BYZ | 51 hr |
| Jan 28, 5:02 PM MST | Wind Chill Advisory | BYZ | 43 hr |
| Feb 8, 12:45 PM MST | Winter Weather Advisory | BYZ | 17 hr |
| Feb 13, 2:39 AM MST | Winter Weather Advisory | BYZ | 44 hr |
| Feb 19, 2:44 AM MST | Winter Storm Watch | BYZ | 24 hr |
| Feb 19, 2:44 AM MST | Winter Storm Warning | BYZ | 4 days |
| Feb 20, 2:25 AM MST | Winter Weather Advisory | BYZ | 11 hr |
| Feb 22, 2:30 AM MST | Winter Weather Advisory | BYZ | 23 hr |
| Feb 22, 1:29 PM MST | Wind Chill Advisory | BYZ | 46 hr |
| Mar 4, 1:13 AM MST | Winter Weather Advisory | BYZ | 3 days |
| Mar 8, 1:03 AM MST | Winter Weather Advisory | BYZ | 38 hr |
| Mar 10, 2:08 AM MST | Winter Weather Advisory | BYZ | 24 hr |
| Mar 11, 9:58 AM MST | Special Weather Statement | BYZ | 3 hr |
| Mar 11, 12:27 PM MST | Winter Weather Advisory | BYZ | 8 hr |
| Mar 30, 2:16 AM MDT | Winter Weather Advisory | BYZ | 35 hr |
| Apr 3, 2:37 AM MDT | Winter Weather Advisory | BYZ | 49 hr |
| Apr 18, 5:50 AM MDT | Winter Weather Advisory | BYZ | 63 hr |
| May 7, 6:14 PM MDT | Special Weather Statement | BYZ | 46 min |
| May 9, 1:47 AM MDT | Flood Watch | BYZ | 71 hr |
| May 17, 8:50 AM MDT | Special Weather Statement | BYZ | 4 hr |
| May 23, 5:15 PM MDT | Special Weather Statement | BYZ | 45 min |
| May 23, 6:17 PM MDT | Flash Flood Warning | BYZ | 3 hr |
| May 23, 6:52 PM MDT | Special Weather Statement | BYZ | 23 min |
| May 23, 7:09 PM MDT | Severe Thunderstorm Warning | BYZ | 51 min |
| May 23, 8:02 PM MDT | Flash Flood Warning | BYZ | 3 hr |
| May 23, 10:31 PM MDT | Special Weather Statement | BYZ | 44 min |
| May 24, 4:04 PM MDT | Mesoscale Discussion | SPC | 116 min |
| May 24, 5:00 PM MDT | Special Weather Statement | BYZ | 45 min |
| May 24, 5:47 PM MDT | Special Weather Statement | BYZ | 28 min |
| May 24, 6:14 PM MDT | Special Weather Statement | BYZ | 61 min |
| May 24, 6:29 PM MDT | Severe Thunderstorm Warning | BYZ | 31 min |
| May 24, 7:15 PM MDT | Special Weather Statement | BYZ | 60 min |
| May 24, 7:56 PM MDT | Areal Flood Advisory | BYZ | 3 hr |
| May 24, 9:08 PM MDT | Flash Flood Warning | BYZ | 3 hr |
| May 25, 2:44 AM MDT | Flood Watch | BYZ | 45 hr |
| May 25, 12:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| May 26, 2:42 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 26, 4:26 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 26, 6:18 PM MDT | Mesoscale Discussion | SPC | 117 min |
| May 27, 5:01 PM MDT | Severe Thunderstorm Warning | BYZ | 41 min |
| May 27, 5:54 PM MDT | Mesoscale Discussion | SPC | 96 min |
| May 27, 7:01 PM MDT | Special Weather Statement | BYZ | 29 min |
| May 27, 7:31 PM MDT | Special Weather Statement | BYZ | 29 min |
| May 27, 8:13 PM MDT | Special Weather Statement | BYZ | 47 min |
| May 27, 8:59 PM MDT | Special Weather Statement | BYZ | 61 min |
| May 31, 12:32 PM MDT | Flood Watch | BYZ | 71 hr |
| May 31, 7:32 PM MDT | Special Weather Statement | BYZ | 28 min |
| Jun 2, 1:46 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jun 7, 5:55 PM MDT | Special Weather Statement | BYZ | 35 min |
| Jun 7, 6:27 PM MDT | Special Weather Statement | BYZ | 33 min |
| Jun 7, 6:53 PM MDT | Special Weather Statement | BYZ | 37 min |
| Jun 8, 4:31 PM MDT | Special Weather Statement | BYZ | 29 min |
| Jun 9, 3:02 AM MDT | Flood Watch | BYZ | 24 hr |
| Jun 18, 6:33 PM MDT | Special Weather Statement | BYZ | 57 min |
| Jun 19, 2:51 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 6:11 PM MDT | Special Weather Statement | BYZ | 49 min |
| Jun 19, 6:39 PM MDT | Severe Thunderstorm Warning | BYZ | 66 min |
| Jun 19, 7:04 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 19, 7:22 PM MDT | Severe Thunderstorm Warning | BYZ | 22 min |
| Jun 19, 7:43 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Jun 19, 11:42 PM MDT | Severe Thunderstorm Warning | BYZ | 33 min |
| Jun 20, 12:23 AM MDT | Severe Thunderstorm Warning | BYZ | 52 min |
| Jun 20, 1:06 AM MDT | Severe Thunderstorm Warning | BYZ | 39 min |
| Jun 21, 1:43 PM MDT | Flood Watch | BYZ | 3 days |
| Jun 21, 9:08 PM MDT | Areal Flood Advisory | BYZ | 3 hr |
| Jun 26, 3:03 AM MDT | Flood Watch | BYZ | 66 hr |
| Jun 26, 3:28 PM MDT | Special Weather Statement | BYZ | 47 min |
| Jun 26, 4:00 PM MDT | Severe Thunderstorm Warning | BYZ | 60 min |
| Jun 26, 4:13 PM MDT | Areal Flood Advisory | BYZ | 3 hr |
| Jul 11, 1:04 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 11, 1:56 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 11, 3:43 PM MDT | Special Weather Statement | BYZ | 32 min |
| Jul 11, 4:11 PM MDT | Special Weather Statement | BYZ | 34 min |
| Jul 11, 7:21 PM MDT | Special Weather Statement | BYZ | 24 min |
| Jul 11, 7:37 PM MDT | Severe Thunderstorm Warning | BYZ | 38 min |
| Jul 11, 8:13 PM MDT | Severe Thunderstorm Warning | BYZ | 47 min |
| Jul 18, 3:32 AM MDT | Special Weather Statement | BYZ | 28 min |
| Jul 18, 3:59 AM MDT | Special Weather Statement | BYZ | 31 min |
| Jul 21, 12:19 PM MDT | Heat Advisory | BYZ | 4 days |
| Jul 22, 11:29 PM MDT | Special Weather Statement | BYZ | 31 min |
| Jul 30, 3:42 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jul 30, 3:57 PM MDT | Special Weather Statement | BYZ | 33 min |
| Jul 30, 4:35 PM MDT | Special Weather Statement | BYZ | 40 min |
| Jul 30, 6:36 PM MDT | Special Weather Statement | BYZ | 24 min |
| Aug 1, 5:05 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Aug 2, 1:43 PM MDT | Flood Watch | BYZ | 60 hr |
| Aug 3, 1:57 PM MDT | Areal Flood Advisory | BYZ | 3 hr |
| Aug 17, 2:20 AM MDT | Heat Advisory | BYZ | 42 hr |
| Aug 18, 8:24 PM MDT | Special Weather Statement | BYZ | 51 min |
| Aug 22, 9:59 PM MDT | Special Weather Statement | BYZ | 31 min |
| Aug 22, 10:15 PM MDT | Special Weather Statement | BYZ | 15 min |
| Aug 22, 10:30 PM MDT | Special Weather Statement | BYZ | 45 min |
| Aug 22, 10:31 PM MDT | Areal Flood Advisory | BYZ | 3 hr |
| Aug 30, 6:40 PM MDT | Severe Thunderstorm Warning | BYZ | 50 min |
| Sep 16, 1:08 PM MDT | Fire Weather Watch | BYZ | 13 hr |
| Sep 17, 2:05 AM MDT | Red Flag Warning | BYZ | 43 hr |
| Sep 24, 5:00 AM MDT | Special Weather Statement | BYZ | 3 hr |
| Oct 22, 8:08 PM MDT | Winter Storm Watch | BYZ | 65 hr |
| Oct 24, 2:23 AM MDT | Winter Storm Warning | BYZ | 67 hr |
| Oct 24, 1:14 PM MDT | Winter Weather Advisory | BYZ | 53 hr |
| Dec 7, 2:09 PM MST | Winter Weather Advisory | BYZ | 26 hr |
| Dec 22, 1:21 PM MST | Winter Weather Advisory | BYZ | 36 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 | 13 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 10 |
| Special Weather Statement | 36 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flood Watch | 7 |
| Areal Flood Advisory | 5 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 15 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Wind Chill Advisory | 2 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.