Alert archive / Montana / Carbon County
Weather alerts in Carbon County, Montana, 2020
100 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Carbon County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 100
- Warnings
- 29
- Watches
- 18
- Advisories
- 26
- Busiest month
- February16 alerts
- Busiest day
- July 23, 20203 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Carbon County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 0 | 100% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Billings, MT: severe thunderstorm warnings | 71 | 41 | 42% | 143 | 55% | 29 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 2, 12:29 PM MST | High Wind Watch | BYZ | 23 hr |
| Jan 3, 2:58 AM MST | High Wind Warning | BYZ | 48 hr |
| Jan 4, 3:57 PM MST | Special Weather Statement | BYZ | 63 min |
| Jan 9, 2:34 AM MST | Winter Weather Advisory | BYZ | 29 hr |
| Jan 13, 3:37 AM MST | Dense Fog Advisory | BYZ | 5 hr |
| Jan 22, 4:16 AM MST | Special Weather Statement | BYZ | 44 min |
| Jan 31, 12:27 PM MST | Winter Storm Watch | BYZ | 26 hr |
| Feb 1, 2:15 PM MST | Winter Storm Warning | BYZ | 56 hr |
| Feb 1, 2:15 PM MST | Winter Weather Advisory | BYZ | 49 hr |
| Feb 3, 3:26 PM MST | Winter Storm Watch | BYZ | 43 hr |
| Feb 5, 3:38 AM MST | Winter Storm Warning | BYZ | 4 days |
| Feb 5, 10:05 AM MST | Winter Weather Advisory | BYZ | 52 hr |
| Feb 8, 2:05 AM MST | Winter Weather Advisory | BYZ | 30 hr |
| Feb 9, 11:30 PM MST | Winter Weather Advisory | BYZ | 22 hr |
| Feb 11, 2:45 AM MST | Winter Weather Advisory | BYZ | 43 hr |
| Feb 14, 1:19 PM MST | Special Weather Statement | BYZ | 56 min |
| Feb 14, 2:17 PM MST | Winter Storm Watch | BYZ | 23 hr |
| Feb 15, 1:18 PM MST | Winter Storm Warning | BYZ | 39 hr |
| Feb 15, 1:18 PM MST | Winter Weather Advisory | BYZ | 45 hr |
| Feb 23, 3:11 PM MST | Winter Weather Advisory | BYZ | 43 hr |
| Feb 23, 9:17 PM MST | Special Weather Statement | BYZ | 88 min |
| Feb 23, 11:55 PM MST | Special Weather Statement | BYZ | 50 min |
| Feb 29, 3:53 PM MST | Special Weather Statement | BYZ | 52 min |
| Mar 2, 3:08 AM MST | High Wind Warning | BYZ | 65 hr |
| Mar 9, 2:47 PM MDT | Winter Weather Advisory | BYZ | 13 hr |
| Mar 11, 3:14 AM MDT | Winter Weather Advisory | BYZ | 30 hr |
| Mar 12, 2:57 PM MDT | Winter Storm Warning | BYZ | 3 days |
| Mar 12, 2:57 PM MDT | Winter Weather Advisory | BYZ | 3 days |
| Mar 13, 3:07 AM MDT | Winter Storm Watch | BYZ | 23 hr |
| Mar 23, 1:15 PM MDT | Winter Weather Advisory | BYZ | 44 hr |
| Mar 30, 2:39 PM MDT | Winter Storm Warning | BYZ | 69 hr |
| Mar 31, 3:23 AM MDT | Winter Weather Advisory | BYZ | 61 hr |
| Apr 9, 3:21 AM MDT | Winter Storm Watch | BYZ | 24 hr |
| Apr 10, 3:01 AM MDT | Winter Storm Warning | BYZ | 56 hr |
| Apr 10, 3:01 AM MDT | Winter Weather Advisory | BYZ | 56 hr |
| Apr 14, 3:10 AM MDT | Winter Storm Warning | BYZ | 45 hr |
| Apr 14, 3:10 AM MDT | Winter Weather Advisory | BYZ | 45 hr |
| Apr 16, 4:43 AM MDT | Special Weather Statement | BYZ | 2 hr |
| Apr 16, 6:47 AM MDT | Special Weather Statement | BYZ | 73 min |
| Apr 23, 1:47 PM MDT | Special Weather Statement | BYZ | 28 min |
| May 5, 2:45 PM MDT | High Wind Watch | BYZ | 20 hr |
| May 6, 3:46 AM MDT | High Wind Warning | BYZ | 35 hr |
| May 7, 3:28 AM MDT | Winter Weather Advisory | BYZ | 11 hr |
| May 20, 3:11 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 20, 6:27 PM MDT | Mesoscale Discussion | SPC | 93 min |
| May 22, 1:32 PM MDT | Winter Weather Advisory | BYZ | 46 hr |
| May 30, 1:45 PM MDT | Mesoscale Discussion | SPC | 90 min |
| May 31, 6:16 AM MDT | River Flood Warning | BYZ | 21 days |
| May 31, 8:33 PM MDT | River Flood Warning | BYZ | 21 days |
| Jun 4, 6:15 PM MDT | Special Weather Statement | BYZ | 45 min |
| Jun 7, 3:04 AM MDT | Winter Weather Advisory | BYZ | 41 hr |
| Jun 16, 2:47 AM MDT | Winter Weather Advisory | BYZ | 49 hr |
| Jun 16, 8:07 PM MDT | Special Weather Statement | BYZ | 23 min |
| Jun 24, 2:29 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 5:53 PM MDT | Special Weather Statement | BYZ | 37 min |
| Jul 5, 5:46 PM MDT | Special Weather Statement | BYZ | 44 min |
| Jul 7, 1:14 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 23, 5:10 PM MDT | Severe Thunderstorm Warning | BYZ | 35 min |
| Jul 23, 5:24 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 5:41 PM MDT | Special Weather Statement | BYZ | 49 min |
| Aug 3, 12:20 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Aug 3, 5:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Aug 3, 6:29 PM MDT | Special Weather Statement | RIW | 31 min |
| Aug 6, 1:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 1:49 PM MDT | Red Flag Warning | BYZ | 31 hr |
| Aug 16, 1:02 PM MDT | Heat Advisory | BYZ | 55 hr |
| Aug 17, 2:11 PM MDT | Red Flag Warning | BYZ | 30 hr |
| Aug 19, 2:54 PM MDT | Special Weather Statement | BYZ | 51 min |
| Aug 26, 2:44 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Aug 26, 8:12 PM MDT | Special Weather Statement | BYZ | 33 min |
| Aug 27, 4:20 PM MDT | Special Weather Statement | BYZ | 40 min |
| Aug 30, 2:17 PM MDT | Fire Weather Watch | BYZ | 13 hr |
| Aug 31, 3:27 AM MDT | Red Flag Warning | BYZ | 69 hr |
| Sep 3, 3:14 AM MDT | Fire Weather Watch | BYZ | 32 hr |
| Sep 4, 11:14 AM MDT | Red Flag Warning | BYZ | 57 hr |
| Sep 6, 3:09 AM MDT | Winter Weather Advisory | BYZ | 51 hr |
| Sep 7, 3:15 AM MDT | Winter Storm Warning | BYZ | 26 hr |
| Sep 12, 2:46 AM MDT | Fire Weather Watch | BYZ | 24 hr |
| Sep 13, 3:11 AM MDT | Red Flag Warning | BYZ | 42 hr |
| Sep 22, 1:46 PM MDT | Fire Weather Watch | BYZ | 24 hr |
| Sep 23, 1:22 PM MDT | Red Flag Warning | BYZ | 31 hr |
| Sep 25, 10:53 AM MDT | Red Flag Warning | BYZ | 33 hr |
| Oct 7, 10:35 AM MDT | Red Flag Warning | BYZ | 34 hr |
| Oct 9, 2:29 AM MDT | Fire Weather Watch | BYZ | 9 hr |
| Oct 9, 11:58 AM MDT | Red Flag Warning | BYZ | 32 hr |
| Oct 13, 3:20 AM MDT | High Wind Watch | BYZ | 12 hr |
| Oct 13, 2:57 PM MDT | High Wind Warning | BYZ | 27 hr |
| Oct 16, 2:32 PM MDT | Winter Weather Advisory | BYZ | 4 days |
| Oct 20, 3:33 AM MDT | Winter Storm Watch | BYZ | 25 hr |
| Oct 21, 4:34 AM MDT | Winter Storm Warning | BYZ | 37 hr |
| Oct 21, 4:34 AM MDT | Winter Weather Advisory | BYZ | 40 hr |
| Oct 22, 2:31 PM MDT | Winter Storm Watch | BYZ | 24 hr |
| Oct 23, 3:58 AM MDT | Winter Storm Warning | BYZ | 50 hr |
| Oct 23, 3:58 AM MDT | Winter Weather Advisory | BYZ | 50 hr |
| Nov 5, 1:28 PM MST | Winter Storm Watch | BYZ | 38 hr |
| Nov 7, 3:51 AM MST | Winter Storm Warning | BYZ | 37 hr |
| Nov 7, 3:51 AM MST | Winter Weather Advisory | BYZ | 37 hr |
| Nov 13, 4:12 AM MST | High Wind Warning | BYZ | 38 hr |
| Dec 14, 9:07 AM MST | Special Weather Statement | BYZ | 3 hr |
| Dec 22, 2:18 AM MST | High Wind Warning | BYZ | 24 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 | 1 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 8 |
| Special Weather Statement | 19 |
| Flooding | |
| River Flood Warning | 2 |
| Winter | |
| Winter Storm Warning | 11 |
| Winter Storm Watch | 8 |
| Winter Weather Advisory | 24 |
| Heat | |
| Heat Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 6 |
| High Wind Watch | 3 |
| Fire | |
| Red Flag Warning | 9 |
| Fire Weather Watch | 5 |
| 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 archive20192021
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.