Alert archive / Montana / Custer County
Weather alerts in Custer County, Montana, 2019
137 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 137
- Warnings
- 31
- Watches
- 19
- Advisories
- 21
- Busiest month
- July48 alerts
- Busiest day
- July 8, 20197 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, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 20 | 11 | 45% | 12 | 58% | 43 min |
| Flash flood warnings | 3 | 1 | 67% | 2 | 100% | 135 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Billings, MT: tornado warnings | 3 | 0 | 100% | 4 | 0% | |
| NWS Billings, MT: severe thunderstorm warnings | 185 | 83 | 55% | 233 | 73% | 29 min |
| NWS Billings, MT: flash flood warnings | 12 | 4 | 67% | 12 | 67% | 171 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 17, 12:24 AM MST | Dense Fog Advisory | BYZ | 6 hr |
| Jan 20, 2:53 PM MST | Winter Weather Advisory | BYZ | 35 hr |
| Jan 25, 3:24 PM MST | High Wind Warning | BYZ | 59 hr |
| Jan 26, 3:20 AM MST | High Wind Watch | BYZ | 23 hr |
| Jan 28, 2:07 PM MST | Special Weather Statement | BYZ | 3 hr |
| Feb 1, 4:08 AM MST | Winter Storm Watch | BYZ | 24 hr |
| Feb 2, 3:45 AM MST | Winter Weather Advisory | BYZ | 41 hr |
| Feb 3, 11:46 AM MST | Wind Chill Advisory | BYZ | 5 days |
| Feb 8, 12:07 PM MST | Wind Chill Advisory | BYZ | 48 hr |
| Feb 10, 11:52 AM MST | Wind Chill Advisory | BYZ | 21 hr |
| Feb 14, 2:40 PM MST | Winter Weather Advisory | BYZ | 25 hr |
| Feb 15, 3:32 PM MST | Winter Storm Watch | BYZ | 12 hr |
| Feb 15, 8:53 PM MST | Winter Storm Warning | BYZ | 38 hr |
| Feb 23, 3:00 AM MST | Winter Weather Advisory | BYZ | 6 days |
| Feb 23, 3:12 PM MST | Wind Chill Advisory | BYZ | 20 hr |
| Feb 24, 2:57 AM MST | Winter Weather Advisory | BYZ | 60 hr |
| Feb 26, 2:30 PM MST | Wind Chill Advisory | BYZ | 20 hr |
| Mar 1, 1:14 PM MST | Wind Chill Advisory | BYZ | 70 hr |
| Mar 1, 6:41 PM MST | Special Weather Statement | BYZ | 79 min |
| Mar 2, 3:10 PM MST | Wind Chill Warning | BYZ | 44 hr |
| Mar 4, 2:59 PM MST | Wind Chill Advisory | BYZ | 19 hr |
| Mar 7, 3:28 AM MST | Winter Storm Watch | BYZ | 23 hr |
| Mar 8, 2:55 AM MST | Winter Weather Advisory | BYZ | 31 hr |
| Mar 12, 3:44 PM MDT | Winter Weather Advisory | BYZ | 35 hr |
| Mar 20, 8:42 AM MDT | Areal Flood Warning | BYZ | 7 hr |
| Mar 20, 5:33 PM MDT | Areal Flood Warning | BYZ | 17 hr |
| Apr 6, 6:42 AM MDT | Special Weather Statement | BYZ | 108 min |
| May 13, 6:42 PM MDT | Special Weather Statement | BYZ | 33 min |
| May 13, 7:18 PM MDT | Special Weather Statement | BYZ | 42 min |
| May 13, 8:04 PM MDT | Special Weather Statement | BYZ | 26 min |
| May 20, 2:43 PM MDT | Flood Watch | BYZ | 48 hr |
| May 26, 7:57 PM MDT | Special Weather Statement | BYZ | 63 min |
| May 28, 2:53 PM MDT | River Flood Watch | BYZ | 4 days |
| May 30, 3:44 PM MDT | Areal Flood Warning | BYZ | 44 hr |
| Jun 14, 12:21 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 14, 4:49 PM MDT | Special Weather Statement | BYZ | 41 min |
| Jun 14, 5:36 PM MDT | Special Weather Statement | BYZ | 39 min |
| Jun 18, 6:03 PM MDT | Special Weather Statement | BYZ | 57 min |
| Jun 18, 7:00 PM MDT | Special Weather Statement | BYZ | 45 min |
| Jun 19, 6:23 PM MDT | Special Weather Statement | BYZ | 22 min |
| Jun 19, 6:50 PM MDT | Special Weather Statement | BYZ | 25 min |
| Jun 19, 7:14 PM MDT | Special Weather Statement | BYZ | 46 min |
| Jun 20, 3:27 PM MDT | Mesoscale Discussion | SPC | 63 min |
| Jun 20, 4:38 PM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 20, 8:43 PM MDT | Mesoscale Discussion | SPC | 32 min |
| Jun 26, 2:16 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 26, 6:03 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Jun 26, 6:42 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Jun 26, 7:35 PM MDT | Flash Flood Warning | BYZ | 4 hr |
| Jun 30, 4:34 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jul 1, 4:40 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jul 1, 6:18 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 2, 1:33 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 5, 9:27 AM MDT | Flash Flood Watch | BYZ | 14 hr |
| Jul 5, 11:46 AM MDT | Special Weather Statement | BYZ | 44 min |
| Jul 5, 12:53 PM MDT | Flash Flood Warning | BYZ | 9 hr |
| Jul 7, 2:58 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 7, 6:45 PM MDT | Special Weather Statement | BYZ | 45 min |
| Jul 7, 6:51 PM MDT | Severe Thunderstorm Warning | BYZ | 54 min |
| Jul 7, 7:43 PM MDT | Severe Thunderstorm Warning | BYZ | 44 min |
| Jul 8, 3:21 AM MDT | Flash Flood Watch | BYZ | 24 hr |
| Jul 8, 12:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 1:25 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 8, 5:24 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 7:13 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Jul 8, 7:37 PM MDT | Severe Thunderstorm Warning | BYZ | 38 min |
| Jul 8, 8:02 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 8, 8:14 PM MDT | Severe Thunderstorm Warning | BYZ | 61 min |
| Jul 8, 8:16 PM MDT | Special Weather Statement | BYZ | 44 min |
| Jul 8, 8:21 PM MDT | Severe Thunderstorm Warning | BYZ | 38 min |
| Jul 13, 12:45 AM MDT | Special Weather Statement | BYZ | 45 min |
| Jul 13, 1:28 AM MDT | Special Weather Statement | BYZ | 47 min |
| Jul 13, 4:10 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 8:21 PM MDT | Severe Thunderstorm Warning | BYZ | 39 min |
| Jul 13, 8:58 PM MDT | Severe Thunderstorm Warning | BYZ | 37 min |
| Jul 13, 9:21 PM MDT | Special Weather Statement | BYZ | 39 min |
| Jul 13, 9:58 PM MDT | Special Weather Statement | BYZ | 47 min |
| Jul 14, 6:15 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 8:40 PM MDT | Special Weather Statement | BYZ | 50 min |
| Jul 14, 9:33 PM MDT | Severe Thunderstorm Warning | BYZ | 57 min |
| Jul 14, 10:27 PM MDT | Severe Thunderstorm Warning | BYZ | 43 min |
| Jul 16, 12:56 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jul 16, 1:28 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 16, 6:29 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jul 17, 8:19 PM MDT | Special Weather Statement | BYZ | 41 min |
| Jul 24, 3:51 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 4:28 PM MDT | Special Weather Statement | BYZ | 47 min |
| Jul 27, 4:42 PM MDT | Flash Flood Warning | BYZ | 3 hr |
| Jul 27, 5:46 PM MDT | Special Weather Statement | BYZ | 59 min |
| Jul 27, 6:44 PM MDT | Special Weather Statement | BYZ | 46 min |
| Jul 30, 2:55 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 30, 4:52 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jul 30, 5:08 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 30, 7:29 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jul 30, 7:34 PM MDT | Severe Thunderstorm Warning | BYZ | 56 min |
| Jul 30, 7:42 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Jul 30, 8:39 PM MDT | Severe Thunderstorm Warning | BYZ | 36 min |
| Jul 30, 10:30 PM MDT | Special Weather Statement | BYZ | 45 min |
| Aug 4, 4:11 AM MDT | Special Weather Statement | BYZ | 49 min |
| Aug 4, 4:50 AM MDT | Severe Thunderstorm Warning | BYZ | 40 min |
| Aug 5, 12:10 AM MDT | Special Weather Statement | BYZ | 50 min |
| Aug 10, 4:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 8:34 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Aug 11, 12:15 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Aug 11, 1:59 PM MDT | Tornado Watch | SPC | 10 hr |
| Aug 11, 5:54 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Aug 11, 8:45 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Aug 11, 8:53 PM MDT | Severe Thunderstorm Warning | BYZ | 52 min |
| Aug 11, 9:40 PM MDT | Severe Thunderstorm Warning | BYZ | 65 min |
| Aug 18, 7:45 AM MDT | Special Weather Statement | BYZ | 75 min |
| Aug 22, 5:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 22, 7:53 PM MDT | Severe Thunderstorm Warning | BYZ | 67 min |
| Aug 25, 8:13 PM MDT | Special Weather Statement | BYZ | 47 min |
| Sep 1, 3:06 PM MDT | Special Weather Statement | BYZ | 39 min |
| Sep 1, 3:25 PM MDT | Severe Thunderstorm Warning | BYZ | 50 min |
| Sep 1, 4:09 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 1, 4:14 PM MDT | Severe Thunderstorm Warning | BYZ | 61 min |
| Sep 17, 4:11 PM MDT | Special Weather Statement | BYZ | 49 min |
| Sep 17, 4:58 PM MDT | Special Weather Statement | BYZ | 47 min |
| Oct 1, 9:10 AM MDT | Winter Weather Advisory | BYZ | 36 hr |
| Oct 3, 4:56 AM MDT | Dense Fog Advisory | BYZ | 4 hr |
| Oct 6, 1:56 PM MDT | Winter Storm Watch | BYZ | 49 hr |
| Oct 8, 4:02 AM MDT | Winter Storm Warning | BYZ | 47 hr |
| Oct 22, 6:12 PM MDT | Special Weather Statement | BYZ | 48 min |
| Oct 22, 6:59 PM MDT | Special Weather Statement | BYZ | 46 min |
| Nov 5, 3:10 AM MST | Winter Weather Advisory | BYZ | 32 hr |
| Nov 8, 2:39 PM MST | Winter Weather Advisory | BYZ | 54 hr |
| Nov 10, 1:51 PM MST | Special Weather Statement | BYZ | 84 min |
| Nov 14, 1:02 AM MST | Dense Fog Advisory | BYZ | 9 hr |
| Nov 20, 8:49 AM MST | Special Weather Statement | BYZ | 116 min |
| Nov 26, 9:45 AM MST | Winter Storm Watch | BYZ | 25 hr |
| Nov 27, 8:00 AM MST | Special Weather Statement | BYZ | 2 hr |
| Nov 27, 10:22 AM MST | Winter Storm Warning | BYZ | 3 days |
| Nov 29, 8:04 AM MST | Special Weather Statement | BYZ | 4 hr |
| Dec 7, 3:14 AM MST | Winter Weather Advisory | BYZ | 41 hr |
| Dec 12, 7:38 AM MST | Special Weather Statement | BYZ | 3 hr |
| Dec 24, 11:28 PM MST | Special Weather Statement | BYZ | 2 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 | 20 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 24 |
| Special Weather Statement | 42 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 2 |
| Flood Watch | 1 |
| River Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 11 |
| Cold | |
| Wind Chill Warning | 1 |
| Wind Chill Advisory | 7 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| 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 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.