Alert archive / Montana / Powder River County
Weather alerts in Powder River County, Montana, 2020
98 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Powder River County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 98
- Warnings
- 31
- Watches
- 22
- Advisories
- 10
- Busiest month
- July32 alerts
- Busiest day
- July 6, 20209 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Powder River County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 6 | 63% | 12 | 58% | 28 min |
| 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 27, 7:47 AM MST | Special Weather Statement | BYZ | 118 min |
| Feb 1, 2:15 PM MST | Winter Weather Advisory | BYZ | 49 hr |
| Feb 8, 2:05 AM MST | Winter Weather Advisory | BYZ | 30 hr |
| Feb 11, 2:45 AM MST | Winter Weather Advisory | BYZ | 43 hr |
| Feb 23, 3:11 PM MST | Winter Weather Advisory | BYZ | 43 hr |
| Feb 26, 6:58 PM MST | Winter Weather Advisory | BYZ | 13 hr |
| Mar 2, 3:08 AM MST | High Wind Warning | BYZ | 65 hr |
| Mar 3, 3:25 AM MST | Red Flag Warning | BYZ | 39 hr |
| Mar 15, 2:46 AM MDT | Special Weather Statement | BYZ | 3 hr |
| Mar 15, 5:47 AM MDT | Special Weather Statement | BYZ | 118 min |
| Mar 31, 3:23 AM MDT | Winter Weather Advisory | BYZ | 61 hr |
| Apr 10, 3:01 AM MDT | Winter Weather Advisory | BYZ | 56 hr |
| May 3, 2:10 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 3, 6:30 PM MDT | Special Weather Statement | BYZ | 60 min |
| May 20, 1:43 PM MDT | Mesoscale Discussion | SPC | 92 min |
| May 20, 3:11 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 20, 6:27 PM MDT | Mesoscale Discussion | SPC | 93 min |
| May 31, 2:35 PM MDT | Mesoscale Discussion | SPC | 115 min |
| May 31, 4:07 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 31, 6:00 PM MDT | Severe Thunderstorm Warning | BYZ | 45 min |
| Jun 4, 1:25 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jun 4, 2:27 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 4, 3:29 PM MDT | Special Weather Statement | BYZ | 46 min |
| Jun 4, 3:49 PM MDT | Severe Thunderstorm Warning | BYZ | 56 min |
| Jun 5, 7:02 PM MDT | Special Weather Statement | BYZ | 43 min |
| Jun 6, 4:49 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 7, 3:47 PM MDT | Special Weather Statement | BYZ | 43 min |
| Jun 7, 4:29 PM MDT | Special Weather Statement | BYZ | 46 min |
| Jun 7, 5:14 PM MDT | Special Weather Statement | BYZ | 46 min |
| Jun 28, 1:11 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 1:39 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 28, 5:18 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Jun 29, 3:56 PM MDT | Tornado Watch | SPC | 8 hr |
| Jun 29, 6:43 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 2:47 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jul 3, 3:44 PM MDT | Special Weather Statement | BYZ | 46 min |
| Jul 3, 4:31 PM MDT | Special Weather Statement | BYZ | 44 min |
| Jul 3, 5:05 PM MDT | Severe Thunderstorm Warning | BYZ | 55 min |
| Jul 3, 5:27 PM MDT | Severe Thunderstorm Warning | BYZ | 33 min |
| Jul 3, 5:30 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 3, 5:59 PM MDT | Severe Thunderstorm Warning | BYZ | 61 min |
| Jul 4, 5:39 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 4, 5:57 PM MDT | Severe Thunderstorm Warning | BYZ | 48 min |
| Jul 4, 6:36 PM MDT | Special Weather Statement | BYZ | 54 min |
| Jul 4, 6:50 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 4, 7:13 PM MDT | Severe Thunderstorm Warning | BYZ | 47 min |
| Jul 5, 4:13 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 5, 9:06 PM MDT | Special Weather Statement | BYZ | 39 min |
| Jul 6, 1:50 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 6, 2:45 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 6, 3:44 PM MDT | Special Weather Statement | BYZ | 46 min |
| Jul 6, 4:10 PM MDT | Severe Thunderstorm Warning | BYZ | 65 min |
| Jul 6, 5:14 PM MDT | Severe Thunderstorm Warning | BYZ | 25 min |
| Jul 6, 5:14 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jul 6, 5:28 PM MDT | Severe Thunderstorm Warning | BYZ | 32 min |
| Jul 6, 5:58 PM MDT | Severe Thunderstorm Warning | BYZ | 24 min |
| Jul 7, 12:47 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 1:14 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 7, 4:52 PM MDT | Severe Thunderstorm Warning | BYZ | 53 min |
| Jul 7, 5:43 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Jul 7, 6:42 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Jul 10, 12:31 PM MDT | Special Weather Statement | BYZ | 59 min |
| Jul 10, 1:41 PM MDT | Severe Thunderstorm Warning | BYZ | 64 min |
| Jul 23, 1:56 PM MDT | Fire Weather Watch | BYZ | 24 hr |
| Jul 28, 3:52 PM MDT | Special Weather Statement | BYZ | 38 min |
| Jul 29, 11:37 AM MDT | Areal Flood Warning | BYZ | 9 hr |
| Aug 3, 12:20 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Aug 6, 4:57 PM MDT | Severe Thunderstorm Warning | BYZ | 49 min |
| 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 21, 12:00 AM MDT | Special Weather Statement | BYZ | 45 min |
| Aug 25, 10:58 PM MDT | Special Weather Statement | BYZ | 62 min |
| Aug 27, 7:56 AM MDT | Special Weather Statement | BYZ | 49 min |
| Aug 27, 1:27 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 27, 4:52 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Aug 27, 5:31 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| 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 12, 2:46 AM MDT | Fire Weather Watch | BYZ | 24 hr |
| Sep 13, 3:11 AM MDT | Red Flag Warning | BYZ | 42 hr |
| Sep 18, 1:53 PM MDT | Red Flag Warning | BYZ | 31 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 13, 3:20 AM MDT | High Wind Watch | BYZ | 12 hr |
| Oct 13, 2:57 PM MDT | High Wind Warning | BYZ | 27 hr |
| Oct 20, 3:33 AM MDT | Winter Storm Watch | BYZ | 25 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 Weather Advisory | BYZ | 50 hr |
| Dec 18, 2:42 AM MST | High Wind Warning | BYZ | 65 hr |
| Dec 21, 11:00 AM MST | High Wind Watch | BYZ | 15 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 | 16 |
| Severe Thunderstorm Watch | 11 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 16 |
| Special Weather Statement | 19 |
| Flooding | |
| Areal Flood Warning | 1 |
| Winter | |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 5 |
| High Wind Watch | 3 |
| Fire | |
| Red Flag Warning | 9 |
| Fire Weather Watch | 5 |
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.