Alert archive / Montana / Carbon County
Weather alerts in Carbon County, Montana, 2017
107 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 107
- Warnings
- 29
- Watches
- 18
- Advisories
- 23
- Busiest month
- June18 alerts
- Busiest day
- June 12, 20175 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, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 3 | 50% | 2 | 100% | 16 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Billings, MT: severe thunderstorm warnings | 31 | 15 | 52% | 58 | 45% | 23 min |
| NWS Billings, MT: flash flood warnings | 1 | 1 | 0% | 1 | 100% | 45 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, 2:31 PM MST | Wind Chill Advisory | BYZ | 45 hr |
| Jan 6, 2:07 PM MST | Winter Storm Watch | BYZ | 25 hr |
| Jan 7, 3:16 PM MST | Winter Storm Warning | BYZ | 5 days |
| Jan 10, 3:48 AM MST | Winter Weather Advisory | BYZ | 35 hr |
| Jan 23, 3:10 AM MST | Winter Weather Advisory | BYZ | 35 hr |
| Jan 29, 2:51 PM MST | Winter Storm Watch | BYZ | 13 hr |
| Jan 30, 3:50 AM MST | Winter Storm Warning | BYZ | 54 hr |
| Jan 30, 3:50 AM MST | Winter Weather Advisory | BYZ | 54 hr |
| Feb 1, 3:22 PM MST | Winter Weather Advisory | BYZ | 24 hr |
| Feb 3, 5:53 AM MST | Special Weather Statement | BYZ | 82 min |
| Feb 3, 7:33 AM MST | Special Weather Statement | BYZ | 87 min |
| Feb 6, 9:06 PM MST | Special Weather Statement | BYZ | 114 min |
| Feb 7, 4:13 AM MST | Winter Weather Advisory | BYZ | 24 hr |
| Feb 8, 8:47 AM MST | Special Weather Statement | BYZ | 118 min |
| Feb 8, 10:50 AM MST | Special Weather Statement | BYZ | 115 min |
| Feb 10, 11:57 AM MST | Areal Flood Advisory | BYZ | 48 hr |
| Feb 22, 3:06 AM MST | Winter Storm Watch | BYZ | 11 hr |
| Feb 22, 1:44 PM MST | Winter Storm Warning | BYZ | 25 hr |
| Feb 22, 1:44 PM MST | Winter Weather Advisory | BYZ | 44 hr |
| Feb 24, 7:53 AM MST | Special Weather Statement | BYZ | 112 min |
| Mar 8, 4:41 AM MST | Winter Storm Warning | BYZ | 57 hr |
| Mar 8, 3:24 PM MST | Winter Weather Advisory | BYZ | 53 hr |
| Mar 29, 2:24 AM MDT | Winter Storm Watch | BYZ | 14 hr |
| Mar 29, 3:58 PM MDT | Winter Storm Warning | BYZ | 53 hr |
| Apr 2, 6:37 PM MDT | Special Weather Statement | BYZ | 38 min |
| Apr 3, 11:53 AM MDT | Winter Weather Advisory | BYZ | 18 hr |
| Apr 4, 6:34 AM MDT | Special Weather Statement | BYZ | 71 min |
| Apr 17, 4:09 PM MDT | Special Weather Statement | BYZ | 81 min |
| Apr 23, 2:46 PM MDT | Winter Storm Watch | BYZ | 13 hr |
| Apr 24, 4:15 AM MDT | Winter Storm Warning | BYZ | 34 hr |
| Apr 26, 4:36 PM MDT | Special Weather Statement | BYZ | 24 min |
| Apr 26, 5:00 PM MDT | Special Weather Statement | BYZ | 30 min |
| Apr 26, 5:35 PM MDT | Special Weather Statement | BYZ | 25 min |
| Apr 26, 6:46 PM MDT | Special Weather Statement | RIW | 44 min |
| Apr 28, 2:33 AM MDT | Winter Weather Advisory | BYZ | 17 hr |
| May 7, 5:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 10, 11:46 AM MDT | River Flood Watch | BYZ | 5 days |
| May 10, 11:46 AM MDT | River Flood Watch | BYZ | 5 days |
| May 15, 3:24 PM MDT | Winter Storm Watch | BYZ | 36 hr |
| May 16, 3:19 PM MDT | Winter Storm Warning | BYZ | 45 hr |
| May 17, 3:17 PM MDT | Winter Weather Advisory | BYZ | 21 hr |
| May 18, 2:39 AM MDT | Areal Flood Advisory | BYZ | 48 hr |
| May 18, 2:48 AM MDT | Areal Flood Advisory | BYZ | 48 hr |
| May 30, 11:36 AM MDT | River Flood Watch | BYZ | 6 days |
| May 30, 11:36 AM MDT | River Flood Watch | BYZ | 6 days |
| May 31, 5:16 PM MDT | Special Weather Statement | BYZ | 29 min |
| Jun 3, 7:15 PM MDT | River Flood Warning | BYZ | 41 hr |
| Jun 6, 1:49 AM MDT | River Flood Warning | BYZ | 4 days |
| Jun 7, 11:37 AM MDT | River Flood Warning | BYZ | 5 days |
| Jun 7, 4:31 PM MDT | Special Weather Statement | BYZ | 44 min |
| Jun 7, 4:39 PM MDT | Special Weather Statement | BYZ | 36 min |
| Jun 12, 11:23 AM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 12, 2:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jun 12, 2:45 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 12, 5:35 PM MDT | Severe Thunderstorm Warning | BYZ | 25 min |
| Jun 12, 5:57 PM MDT | Severe Thunderstorm Warning | BYZ | 33 min |
| Jun 12, 6:00 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jun 12, 6:25 PM MDT | Severe Thunderstorm Warning | BYZ | 65 min |
| Jun 22, 3:47 AM MDT | River Flood Warning | BYZ | 62 hr |
| Jun 22, 10:15 AM MDT | River Flood Warning | BYZ | 56 hr |
| Jun 27, 1:21 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 27, 2:14 PM MDT | Special Weather Statement | BYZ | 61 min |
| Jun 28, 12:39 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 28, 12:55 PM MDT | Special Weather Statement | BYZ | 50 min |
| Jul 3, 6:28 PM MDT | Special Weather Statement | RIW | 32 min |
| Jul 9, 1:44 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 9, 4:05 PM MDT | Severe Thunderstorm Warning | BYZ | 55 min |
| Jul 10, 1:20 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 10, 3:51 PM MDT | Special Weather Statement | RIW | 24 min |
| Jul 10, 4:08 PM MDT | Special Weather Statement | RIW | 37 min |
| Jul 15, 3:37 PM MDT | Special Weather Statement | RIW | 38 min |
| Jul 16, 2:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jul 16, 2:58 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Jul 17, 11:30 PM MDT | Special Weather Statement | BYZ | 45 min |
| Jul 29, 5:44 PM MDT | Special Weather Statement | RIW | 46 min |
| Aug 1, 8:28 PM MDT | Special Weather Statement | BYZ | 47 min |
| Aug 1, 8:47 PM MDT | Severe Thunderstorm Warning | BYZ | 58 min |
| Aug 25, 2:30 AM MDT | Special Weather Statement | BYZ | 45 min |
| Sep 1, 2:29 PM MDT | Fire Weather Watch | BYZ | 24 hr |
| Sep 2, 2:50 PM MDT | Red Flag Warning | BYZ | 54 hr |
| Sep 13, 3:25 PM MDT | Winter Storm Watch | BYZ | 13 hr |
| Sep 14, 4:04 AM MDT | Winter Storm Warning | BYZ | 58 hr |
| Sep 20, 3:51 AM MDT | Winter Storm Watch | BYZ | 11 hr |
| Sep 20, 2:51 PM MDT | Winter Storm Warning | BYZ | 63 hr |
| Sep 21, 2:59 PM MDT | Winter Weather Advisory | BYZ | 20 hr |
| Sep 30, 3:13 PM MDT | Winter Weather Advisory | BYZ | 36 hr |
| Oct 19, 2:27 PM MDT | Red Flag Warning | BYZ | 30 hr |
| Oct 20, 4:31 PM MDT | Special Weather Statement | BYZ | 89 min |
| Oct 20, 5:47 PM MDT | Special Weather Statement | BYZ | 118 min |
| Oct 23, 3:04 PM MDT | Fire Weather Watch | BYZ | 24 hr |
| Oct 24, 3:01 PM MDT | Red Flag Warning | BYZ | 36 hr |
| Oct 31, 3:17 AM MDT | Winter Storm Warning | BYZ | 48 hr |
| Oct 31, 2:22 PM MDT | Winter Weather Advisory | BYZ | 37 hr |
| Nov 2, 3:22 AM MDT | Winter Storm Watch | BYZ | 11 hr |
| Nov 2, 2:19 PM MDT | Winter Storm Watch | BYZ | 13 hr |
| Nov 2, 2:19 PM MDT | Winter Storm Warning | BYZ | 49 hr |
| Nov 5, 2:50 AM MST | Winter Weather Advisory | BYZ | 33 hr |
| Nov 11, 5:13 AM MST | Winter Weather Advisory | BYZ | 7 hr |
| Nov 16, 3:22 AM MST | Winter Storm Warning | BYZ | 38 hr |
| Dec 2, 2:02 PM MST | Winter Storm Warning | BYZ | 38 hr |
| Dec 2, 2:02 PM MST | Winter Weather Advisory | BYZ | 44 hr |
| Dec 15, 2:28 PM MST | Winter Weather Advisory | BYZ | 32 hr |
| Dec 19, 3:18 PM MST | Winter Weather Advisory | BYZ | 36 hr |
| Dec 21, 3:08 PM MST | Winter Weather Advisory | BYZ | 39 hr |
| Dec 22, 3:00 AM MST | Winter Storm Warning | BYZ | 27 hr |
| Dec 27, 4:04 AM MST | Winter Storm Watch | BYZ | 24 hr |
| Dec 27, 4:04 AM MST | Winter Storm Warning | BYZ | 3 days |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.