Alert archive / Montana / Powder River County
Weather alerts in Powder River County, Montana, 2018
153 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 153
- Warnings
- 38
- Watches
- 18
- Advisories
- 23
- Busiest month
- June47 alerts
- Busiest day
- June 29, 201814 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, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 31 | 17 | 45% | 12 | 100% | 25 min |
| Flash flood warnings | 0 | 0 |
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 10, 3:08 PM MST | Wind Chill Advisory | BYZ | 18 hr |
| Jan 11, 3:54 AM MST | Winter Weather Advisory | BYZ | 41 hr |
| Jan 13, 12:27 PM MST | Special Weather Statement | BYZ | 2 hr |
| Jan 13, 2:54 PM MST | Special Weather Statement | BYZ | 3 hr |
| Jan 14, 2:26 AM MST | Wind Chill Advisory | BYZ | 57 hr |
| Jan 14, 1:11 PM MST | Special Weather Statement | BYZ | 19 min |
| Jan 14, 1:15 PM MST | Special Weather Statement | BYZ | 15 min |
| Jan 14, 1:54 PM MST | Special Weather Statement | BYZ | 81 min |
| Jan 19, 7:34 AM MST | Special Weather Statement | BYZ | 116 min |
| Jan 31, 2:01 PM MST | Special Weather Statement | BYZ | 119 min |
| Jan 31, 3:49 PM MST | Special Weather Statement | BYZ | 116 min |
| 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 2, 2:51 PM MST | Winter Weather Advisory | BYZ | 13 hr |
| Feb 4, 3:16 PM MST | Winter Weather Advisory | BYZ | 30 hr |
| 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 9, 2:55 PM MST | Wind Chill Advisory | BYZ | 21 hr |
| Feb 11, 2:05 PM MST | Wind Chill Advisory | BYZ | 22 hr |
| Feb 14, 2:33 PM MST | Winter Weather Advisory | BYZ | 24 hr |
| Feb 16, 11:55 PM MST | Special Weather Statement | BYZ | 95 min |
| Feb 17, 2:56 AM MST | Winter Weather Advisory | BYZ | 66 hr |
| Mar 2, 3:18 AM MST | Winter Storm Watch | BYZ | 48 hr |
| Mar 3, 2:34 PM MST | Winter Weather Advisory | BYZ | 49 hr |
| Mar 3, 2:38 PM MST | Dense Fog Advisory | BYZ | 21 hr |
| Mar 4, 11:58 AM MST | Special Weather Statement | BYZ | 3 hr |
| Mar 9, 10:22 PM MST | Special Weather Statement | BYZ | 83 min |
| Mar 14, 2:49 PM MDT | Winter Storm Watch | BYZ | 12 hr |
| Mar 15, 2:37 AM MDT | Winter Storm Warning | BYZ | 41 hr |
| Mar 17, 8:12 PM MDT | Areal Flood Advisory | BYZ | 42 hr |
| Mar 23, 3:13 PM MDT | Winter Storm Watch | BYZ | 36 hr |
| Mar 25, 2:50 AM MDT | Winter Weather Advisory | BYZ | 35 hr |
| 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 10, 2:58 PM MDT | Winter Storm Watch | BYZ | 36 hr |
| Apr 12, 2:36 AM MDT | Winter Weather Advisory | BYZ | 36 hr |
| Apr 23, 3:20 PM MDT | Winter Weather Advisory | BYZ | 15 hr |
| Apr 29, 12:40 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 29, 3:16 PM MDT | Special Weather Statement | BYZ | 44 min |
| Apr 29, 3:52 PM MDT | Severe Thunderstorm Warning | BYZ | 53 min |
| Apr 29, 4:21 PM MDT | Special Weather Statement | BYZ | 39 min |
| Apr 29, 4:29 PM MDT | Severe Thunderstorm Warning | BYZ | 41 min |
| Apr 29, 5:06 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 7, 2:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| May 17, 5:18 PM MDT | Special Weather Statement | BYZ | 27 min |
| May 17, 5:36 PM MDT | Special Weather Statement | BYZ | 24 min |
| May 17, 5:51 PM MDT | Severe Thunderstorm Warning | BYZ | 24 min |
| May 17, 6:08 PM MDT | Special Weather Statement | BYZ | 37 min |
| May 17, 6:49 PM MDT | Special Weather Statement | BYZ | 26 min |
| May 17, 8:39 PM MDT | Special Weather Statement | BYZ | 51 min |
| May 22, 4:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 23, 2:34 PM MDT | Mesoscale Discussion | SPC | 116 min |
| May 23, 5:06 PM MDT | Special Weather Statement | BYZ | 39 min |
| May 23, 7:16 PM MDT | Severe Thunderstorm Warning | BYZ | 59 min |
| May 27, 1:15 AM MDT | Special Weather Statement | BYZ | 30 min |
| May 27, 4:25 AM MDT | Flood Watch | BYZ | 40 hr |
| May 31, 1:50 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 31, 5:27 PM MDT | Mesoscale Discussion | SPC | 93 min |
| May 31, 8:18 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Jun 1, 11:03 AM MDT | Mesoscale Discussion | SPC | 117 min |
| Jun 1, 11:45 AM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 1, 12:51 PM MDT | Special Weather Statement | UNR | 24 min |
| Jun 1, 12:53 PM MDT | Severe Thunderstorm Warning | BYZ | 67 min |
| Jun 1, 1:55 PM MDT | Special Weather Statement | BYZ | 50 min |
| Jun 1, 3:04 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jun 6, 6:57 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Jun 6, 7:52 PM MDT | Special Weather Statement | BYZ | 38 min |
| Jun 6, 8:04 PM MDT | Severe Thunderstorm Warning | BYZ | 56 min |
| Jun 7, 1:51 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 7, 3:49 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 7, 5:16 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jun 7, 6:14 PM MDT | Severe Thunderstorm Warning | BYZ | 61 min |
| Jun 7, 7:10 PM MDT | Special Weather Statement | BYZ | 80 min |
| Jun 8, 8:40 PM MDT | Special Weather Statement | BYZ | 50 min |
| Jun 9, 2:50 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 5:15 PM MDT | Special Weather Statement | BYZ | 45 min |
| Jun 9, 5:27 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Jun 9, 5:50 PM MDT | Special Weather Statement | BYZ | 40 min |
| Jun 9, 6:19 PM MDT | Special Weather Statement | BYZ | 41 min |
| Jun 9, 6:35 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 15, 5:49 PM MDT | Severe Thunderstorm Warning | BYZ | 56 min |
| Jun 15, 6:44 PM MDT | Special Weather Statement | BYZ | 61 min |
| Jun 21, 6:43 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 21, 9:43 PM MDT | Special Weather Statement | BYZ | 62 min |
| Jun 28, 2:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 3:42 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 28, 3:54 PM MDT | Special Weather Statement | BYZ | 51 min |
| Jun 28, 4:09 PM MDT | Severe Thunderstorm Warning | BYZ | 66 min |
| Jun 28, 5:13 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Jun 28, 5:16 PM MDT | Special Weather Statement | BYZ | 44 min |
| Jun 28, 5:59 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jun 28, 6:35 PM MDT | Severe Thunderstorm Warning | BYZ | 55 min |
| Jun 28, 6:48 PM MDT | Severe Thunderstorm Warning | BYZ | 57 min |
| Jun 28, 7:29 PM MDT | Severe Thunderstorm Warning | BYZ | 61 min |
| Jun 28, 7:44 PM MDT | Severe Thunderstorm Warning | BYZ | 61 min |
| Jun 28, 8:06 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 28, 8:25 PM MDT | Severe Thunderstorm Warning | BYZ | 65 min |
| Jun 28, 8:29 PM MDT | Severe Thunderstorm Warning | BYZ | 61 min |
| Jun 28, 9:26 PM MDT | Severe Thunderstorm Warning | BYZ | 79 min |
| Jun 28, 10:18 PM MDT | Severe Thunderstorm Warning | BYZ | 57 min |
| Jun 28, 10:41 PM MDT | Severe Thunderstorm Warning | BYZ | 34 min |
| Jun 29, 6:16 AM MDT | Special Weather Statement | BYZ | 44 min |
| Jun 29, 1:06 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 29, 1:57 PM MDT | Special Weather Statement | BYZ | 48 min |
| Jun 29, 2:29 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jul 2, 5:58 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 2, 6:59 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 2, 8:50 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 2, 10:23 PM MDT | Severe Thunderstorm Warning | BYZ | 52 min |
| Jul 2, 11:01 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jul 2, 11:15 PM MDT | Severe Thunderstorm Warning | BYZ | 45 min |
| Jul 3, 2:25 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 7:26 PM MDT | Severe Thunderstorm Warning | BYZ | 49 min |
| Jul 8, 9:59 PM MDT | Special Weather Statement | BYZ | 31 min |
| Jul 8, 10:33 PM MDT | Special Weather Statement | BYZ | 57 min |
| Jul 8, 11:20 PM MDT | Special Weather Statement | BYZ | 25 min |
| Jul 8, 11:33 PM MDT | Special Weather Statement | BYZ | 27 min |
| Jul 8, 11:51 PM MDT | Special Weather Statement | BYZ | 24 min |
| Jul 9, 6:22 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 12, 4:57 PM MDT | Special Weather Statement | BYZ | 48 min |
| Jul 12, 5:13 PM MDT | Special Weather Statement | BYZ | 47 min |
| Jul 17, 3:25 AM MDT | Flash Flood Watch | BYZ | 18 hr |
| Jul 17, 2:46 PM MDT | Severe Thunderstorm Warning | BYZ | 44 min |
| Jul 17, 3:23 PM MDT | Special Weather Statement | BYZ | 82 min |
| Jul 17, 3:26 PM MDT | Special Weather Statement | BYZ | 79 min |
| Jul 17, 3:58 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Jul 21, 1:53 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 21, 3:49 PM MDT | Severe Thunderstorm Warning | BYZ | 41 min |
| Jul 28, 8:42 PM MDT | Special Weather Statement | BYZ | 48 min |
| Jul 29, 1:12 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 5:27 PM MDT | Severe Thunderstorm Warning | BYZ | 63 min |
| Aug 3, 6:28 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Aug 3, 6:41 PM MDT | Severe Thunderstorm Warning | BYZ | 49 min |
| Aug 3, 7:28 PM MDT | Severe Thunderstorm Warning | BYZ | 92 min |
| Aug 9, 3:51 AM MDT | Excessive Heat Warning | BYZ | 4 days |
| 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 12, 5:04 PM MDT | Special Weather Statement | BYZ | 41 min |
| Aug 22, 8:43 PM MDT | Special Weather Statement | BYZ | 62 min |
| Sep 15, 3:11 AM MDT | Red Flag Warning | BYZ | 18 hr |
| Sep 23, 8:04 AM MDT | Special Weather Statement | BYZ | 4 hr |
| Oct 7, 3:26 AM MDT | Winter Weather Advisory | BYZ | 50 hr |
| Nov 15, 2:33 PM MST | Winter Weather Advisory | BYZ | 38 hr |
| Nov 25, 4:48 AM MST | Special Weather Statement | BYZ | 5 hr |
| Nov 29, 3:13 AM MST | Winter Storm Watch | BYZ | 24 hr |
| Nov 30, 3:33 AM MST | Winter Weather Advisory | BYZ | 48 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.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 31 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 26 |
| Special Weather Statement | 48 |
| Flooding | |
| Flash Flood Watch | 1 |
| Flood Watch | 1 |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 9 |
| Winter Weather Advisory | 17 |
| Heat | |
| Excessive Heat Warning | 1 |
| Cold | |
| Wind Chill Advisory | 4 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| 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 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.