Alert archive / Montana / Carbon County
Weather alerts in Carbon County, Montana, 2018
127 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 127
- Warnings
- 44
- Watches
- 13
- Advisories
- 31
- Busiest month
- May23 alerts
- Busiest day
- May 23, 20186 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, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 21 | 13 | 38% | 9 | 78% | 19 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 90 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Billings, MT: tornado warnings | 2 | 2 | 0% | 5 | 60% | 23 min |
| NWS Billings, MT: severe thunderstorm warnings | 176 | 84 | 52% | 213 | 73% | 23 min |
| NWS Billings, MT: flash flood warnings | 8 | 6 | 25% | 7 | 86% | 44 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 9, 4:11 AM MST | Winter Storm Watch | BYZ | 11 hr |
| Jan 9, 2:49 PM MST | Winter Weather Advisory | BYZ | 30 hr |
| Jan 11, 3:54 AM MST | Winter Storm Warning | BYZ | 41 hr |
| Jan 14, 2:23 AM MST | Winter Weather Advisory | BYZ | 24 hr |
| Jan 14, 6:57 PM MST | Special Weather Statement | BYZ | 18 min |
| Jan 14, 7:19 PM MST | Special Weather Statement | BYZ | 3 hr |
| Jan 18, 2:48 AM MST | Winter Storm Warning | BYZ | 45 hr |
| Jan 19, 4:59 AM MST | Special Weather Statement | BYZ | 3 hr |
| Jan 19, 5:40 AM MST | Winter Weather Advisory | BYZ | 14 hr |
| Feb 2, 2:51 PM MST | Winter Storm Watch | BYZ | 13 hr |
| Feb 2, 2:51 PM MST | Winter Storm Warning | BYZ | 3 days |
| Feb 4, 3:16 PM MST | Winter Weather Advisory | BYZ | 30 hr |
| Feb 6, 9:03 AM MST | Special Weather Statement | BYZ | 57 min |
| Feb 6, 3:39 PM MST | Winter Storm Watch | BYZ | 35 hr |
| Feb 7, 3:33 PM MST | Winter Storm Warning | BYZ | 42 hr |
| Feb 7, 3:33 PM MST | Winter Weather Advisory | BYZ | 42 hr |
| Feb 11, 3:23 AM MST | Winter Weather Advisory | BYZ | 27 hr |
| Feb 14, 2:33 PM MST | Winter Weather Advisory | BYZ | 24 hr |
| Feb 16, 2:57 AM MST | Winter Storm Warning | BYZ | 72 hr |
| Feb 26, 2:50 AM MST | Winter Weather Advisory | BYZ | 18 hr |
| Mar 2, 3:18 AM MST | Winter Storm Watch | BYZ | 48 hr |
| Mar 3, 3:07 AM MST | Winter Storm Warning | BYZ | 3 days |
| Mar 30, 2:11 PM MDT | Winter Weather Advisory | BYZ | 25 hr |
| Mar 31, 8:07 AM MDT | Special Weather Statement | BYZ | 113 min |
| Mar 31, 2:52 PM MDT | Winter Storm Watch | BYZ | 24 hr |
| Apr 1, 3:30 AM MDT | Winter Storm Warning | BYZ | 50 hr |
| Apr 4, 2:23 AM MDT | Winter Weather Advisory | BYZ | 61 hr |
| Apr 4, 2:58 PM MDT | Winter Storm Warning | BYZ | 45 hr |
| Apr 7, 10:18 PM MDT | Special Weather Statement | BYZ | 117 min |
| Apr 10, 2:58 PM MDT | Winter Storm Watch | BYZ | 36 hr |
| Apr 11, 3:15 PM MDT | Winter Storm Warning | BYZ | 48 hr |
| Apr 12, 2:36 AM MDT | Winter Weather Advisory | BYZ | 36 hr |
| Apr 22, 2:36 PM MDT | Winter Weather Advisory | BYZ | 25 hr |
| Apr 30, 3:15 AM MDT | Winter Storm Warning | BYZ | 24 hr |
| May 9, 6:01 PM MDT | Severe Thunderstorm Warning | BYZ | 29 min |
| May 9, 6:47 PM MDT | Special Weather Statement | BYZ | 43 min |
| May 10, 2:19 PM MDT | Winter Storm Watch | BYZ | 13 hr |
| May 11, 2:56 AM MDT | Winter Storm Warning | BYZ | 36 hr |
| May 21, 3:17 PM MDT | Special Weather Statement | RIW | 28 min |
| May 22, 11:27 AM MDT | River Flood Warning | BYZ | 14 days |
| May 22, 11:27 AM MDT | River Flood Warning | BYZ | 14 days |
| May 22, 12:40 PM MDT | Flood Watch | BYZ | 35 hr |
| May 22, 8:51 PM MDT | Severe Thunderstorm Warning | BYZ | 54 min |
| May 22, 9:13 PM MDT | Areal Flood Advisory | BYZ | 3 hr |
| May 22, 10:31 PM MDT | Flash Flood Warning | BYZ | 6 hr |
| May 23, 5:00 AM MDT | Areal Flood Advisory | BYZ | 7 hr |
| May 23, 7:55 AM MDT | Areal Flood Warning | BYZ | 6 hr |
| May 23, 12:44 PM MDT | Areal Flood Warning | BYZ | 6 hr |
| May 26, 2:21 PM MDT | Mesoscale Discussion | SPC | 114 min |
| May 27, 4:25 AM MDT | Flood Watch | BYZ | 40 hr |
| May 27, 7:31 PM MDT | Special Weather Statement | BYZ | 44 min |
| May 28, 1:45 PM MDT | Special Weather Statement | BYZ | 45 min |
| May 28, 3:30 PM MDT | Areal Flood Advisory | BYZ | 4 hr |
| May 31, 1:50 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 31, 4:09 PM MDT | Special Weather Statement | BYZ | 51 min |
| May 31, 4:16 PM MDT | Severe Thunderstorm Warning | BYZ | 43 min |
| May 31, 5:27 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jun 4, 1:47 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jun 6, 11:13 AM MDT | River Flood Warning | BYZ | 5 days |
| Jun 6, 11:13 AM MDT | River Flood Warning | BYZ | 5 days |
| Jun 7, 1:20 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 7, 2:41 PM MDT | Special Weather Statement | BYZ | 49 min |
| Jun 7, 4:09 PM MDT | Severe Thunderstorm Warning | BYZ | 51 min |
| Jun 10, 2:59 PM MDT | Winter Weather Advisory | BYZ | 30 hr |
| Jun 15, 2:30 PM MDT | Winter Weather Advisory | BYZ | 22 hr |
| Jun 16, 4:39 PM MDT | Severe Thunderstorm Warning | BYZ | 36 min |
| Jun 16, 5:10 PM MDT | Severe Thunderstorm Warning | BYZ | 32 min |
| Jun 17, 3:50 AM MDT | Flood Watch | BYZ | 59 hr |
| Jun 17, 4:02 AM MDT | Winter Weather Advisory | BYZ | 41 hr |
| Jun 17, 1:17 PM MDT | River Flood Warning | BYZ | 4 days |
| Jun 17, 1:17 PM MDT | River Flood Warning | BYZ | 5 days |
| Jun 18, 4:33 PM MDT | Special Weather Statement | BYZ | 57 min |
| Jun 21, 2:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jun 23, 1:55 PM MDT | Special Weather Statement | BYZ | 35 min |
| Jun 26, 4:51 PM MDT | Severe Thunderstorm Warning | BYZ | 54 min |
| Jun 29, 11:23 AM MDT | Mesoscale Discussion | SPC | 97 min |
| Jul 2, 6:57 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Jul 2, 7:55 PM MDT | Severe Thunderstorm Warning | BYZ | 65 min |
| Jul 17, 2:24 PM MDT | Special Weather Statement | BYZ | 51 min |
| Jul 21, 7:35 PM MDT | Special Weather Statement | BYZ | 25 min |
| Jul 26, 1:10 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 26, 4:50 PM MDT | Severe Thunderstorm Warning | BYZ | 55 min |
| Jul 26, 5:33 PM MDT | Severe Thunderstorm Warning | BYZ | 57 min |
| Jul 27, 3:52 PM MDT | Severe Thunderstorm Warning | BYZ | 38 min |
| Jul 27, 4:27 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Jul 27, 4:54 PM MDT | Severe Thunderstorm Warning | BYZ | 66 min |
| Jul 27, 5:12 PM MDT | Severe Thunderstorm Warning | BYZ | 48 min |
| Jul 27, 5:57 PM MDT | Severe Thunderstorm Warning | BYZ | 48 min |
| Jul 28, 5:02 PM MDT | Severe Thunderstorm Warning | BYZ | 43 min |
| Jul 28, 5:43 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Jul 28, 6:40 PM MDT | Special Weather Statement | BYZ | 35 min |
| Aug 1, 1:43 PM MDT | Special Weather Statement | BYZ | 47 min |
| Aug 2, 2:29 PM MDT | Special Weather Statement | RIW | 31 min |
| Aug 2, 2:32 PM MDT | Severe Thunderstorm Warning | BYZ | 28 min |
| Aug 2, 2:40 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 2:46 PM MDT | Special Weather Statement | BYZ | 44 min |
| Aug 2, 2:57 PM MDT | Severe Thunderstorm Warning | BYZ | 48 min |
| Aug 2, 3:35 PM MDT | Special Weather Statement | BYZ | 40 min |
| Aug 3, 1:48 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Aug 3, 4:18 PM MDT | Special Weather Statement | BYZ | 42 min |
| Aug 3, 4:51 PM MDT | Severe Thunderstorm Warning | BYZ | 39 min |
| Aug 5, 1:27 PM MDT | Special Weather Statement | BYZ | 48 min |
| Aug 9, 2:34 PM MDT | Heat Advisory | BYZ | 55 hr |
| Aug 9, 2:50 PM MDT | Fire Weather Watch | BYZ | 37 hr |
| Aug 11, 3:28 AM MDT | Red Flag Warning | BYZ | 42 hr |
| Aug 11, 11:12 PM MDT | Special Weather Statement | BYZ | 18 min |
| Aug 11, 11:29 PM MDT | Special Weather Statement | BYZ | 46 min |
| Aug 22, 9:40 PM MDT | Special Weather Statement | BYZ | 50 min |
| Aug 26, 4:12 AM MDT | Winter Weather Advisory | BYZ | 53 hr |
| Sep 8, 3:56 PM MDT | Special Weather Statement | BYZ | 49 min |
| Sep 27, 2:50 AM MDT | Winter Weather Advisory | BYZ | 31 hr |
| Sep 30, 5:56 AM MDT | Winter Weather Advisory | BYZ | 6 hr |
| Oct 4, 3:46 AM MDT | Winter Weather Advisory | BYZ | 27 hr |
| Oct 12, 2:36 PM MDT | Winter Weather Advisory | BYZ | 30 hr |
| Nov 2, 2:24 PM MDT | Winter Storm Watch | BYZ | 24 hr |
| Nov 2, 6:42 PM MDT | Special Weather Statement | BYZ | 63 min |
| Nov 3, 2:43 PM MDT | Winter Storm Warning | BYZ | 31 hr |
| Nov 5, 2:26 PM MST | Winter Weather Advisory | BYZ | 25 hr |
| Nov 7, 9:31 AM MST | Winter Weather Advisory | BYZ | 13 hr |
| Nov 10, 3:13 PM MST | Winter Weather Advisory | BYZ | 35 hr |
| Nov 15, 2:33 PM MST | Winter Weather Advisory | BYZ | 38 hr |
| Nov 22, 2:54 PM MST | Winter Weather Advisory | BYZ | 54 hr |
| Nov 23, 8:15 AM MST | Winter Storm Warning | BYZ | 37 hr |
| Nov 25, 4:48 AM MST | Special Weather Statement | BYZ | 5 hr |
| Dec 25, 3:17 AM MST | Winter Weather Advisory | BYZ | 38 hr |
| Dec 29, 1:58 PM MST | Winter Weather Advisory | BYZ | 49 hr |
| Dec 30, 8:48 PM MST | Mesoscale Discussion | SPC | 5 hr |
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 archive20172019
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.