Alert archive / Montana / Petroleum County
Weather alerts in Petroleum County, Montana, 2016
130 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Petroleum County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 130
- Warnings
- 21
- Watches
- 14
- Advisories
- 54
- Busiest month
- June35 alerts
- Busiest day
- June 9, 201610 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Petroleum County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 11 | 15% | 16 | 81% | 20 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: tornado warnings | 3 | 0 | 100% | 1 | 0% | |
| NWS Glasgow, MT: severe thunderstorm warnings | 144 | 78 | 46% | 242 | 78% | 28 min |
| NWS Glasgow, MT: flash flood warnings | 1 | 1 | 0% | 1 | 100% | 7 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 |
|---|---|---|---|
| Feb 5, 3:54 AM MST | High Wind Watch | GGW | 11 hr |
| Feb 5, 2:34 PM MST | High Wind Warning | GGW | 50 hr |
| Feb 13, 8:47 AM MST | Freezing Rain Advisory | GGW | 6 hr |
| Feb 14, 2:21 PM MST | High Wind Watch | GGW | 13 hr |
| Feb 17, 2:10 PM MST | High Wind Watch | GGW | 13 hr |
| Feb 18, 3:28 AM MST | High Wind Warning | GGW | 35 hr |
| Mar 13, 2:09 PM MDT | Lake Wind Advisory | GGW | 54 hr |
| Mar 16, 3:01 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Mar 17, 2:50 AM MDT | Lake Wind Advisory | GGW | 18 hr |
| Mar 21, 2:57 AM MDT | Lake Wind Advisory | GGW | 16 hr |
| Mar 22, 3:03 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Mar 24, 2:00 PM MDT | Lake Wind Advisory | GGW | 23 hr |
| Mar 29, 2:44 AM MDT | Lake Wind Advisory | GGW | 18 hr |
| Mar 30, 3:18 AM MDT | Lake Wind Advisory | GGW | 41 hr |
| Apr 2, 2:46 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Apr 3, 3:07 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Apr 4, 3:03 AM MDT | High Wind Watch | GGW | 12 hr |
| Apr 4, 2:53 PM MDT | High Wind Warning | GGW | 30 hr |
| Apr 6, 3:10 AM MDT | Lake Wind Advisory | GGW | 41 hr |
| Apr 8, 2:19 PM MDT | Lake Wind Advisory | GGW | 30 hr |
| Apr 14, 9:09 PM MDT | Lake Wind Advisory | GGW | 24 hr |
| Apr 22, 2:37 PM MDT | Lake Wind Advisory | GGW | 37 hr |
| May 6, 4:38 AM MDT | Lake Wind Advisory | GGW | 10 hr |
| May 8, 3:08 AM MDT | Lake Wind Advisory | GGW | 18 hr |
| May 9, 3:02 AM MDT | Lake Wind Advisory | GGW | 66 hr |
| May 10, 9:45 AM MDT | Winter Weather Advisory | GGW | 20 hr |
| May 20, 3:33 AM MDT | Lake Wind Advisory | GGW | 47 hr |
| May 21, 1:47 AM MDT | Special Weather Statement | GGW | 43 min |
| May 21, 2:10 PM MDT | Mesoscale Discussion | SPC | 65 min |
| May 21, 2:26 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 21, 4:01 PM MDT | Special Weather Statement | TFX | 14 min |
| May 21, 4:34 PM MDT | Special Weather Statement | GGW | 41 min |
| May 21, 4:37 PM MDT | Mesoscale Discussion | SPC | 53 min |
| May 22, 3:22 AM MDT | Lake Wind Advisory | GGW | 19 hr |
| May 23, 3:18 AM MDT | Lake Wind Advisory | GGW | 18 hr |
| May 30, 2:56 AM MDT | Lake Wind Advisory | GGW | 42 hr |
| Jun 2, 7:26 PM MDT | Lake Wind Advisory | GGW | 25 hr |
| Jun 9, 11:44 AM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 9, 1:01 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 9, 1:48 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Jun 9, 2:29 PM MDT | Special Weather Statement | TFX | 46 min |
| Jun 9, 2:40 PM MDT | Special Weather Statement | GGW | 50 min |
| Jun 9, 2:51 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 9, 3:06 PM MDT | Severe Thunderstorm Warning | GGW | 54 min |
| Jun 9, 3:58 PM MDT | Severe Thunderstorm Warning | GGW | 62 min |
| Jun 9, 5:30 PM MDT | Special Weather Statement | TFX | 30 min |
| Jun 9, 5:32 PM MDT | Severe Thunderstorm Warning | GGW | 43 min |
| Jun 9, 6:05 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 9, 6:15 PM MDT | Severe Thunderstorm Warning | GGW | 60 min |
| Jun 10, 3:06 PM MDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Jun 10, 5:18 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Jun 10, 7:20 PM MDT | Severe Thunderstorm Warning | GGW | 55 min |
| Jun 10, 8:35 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 10, 8:36 PM MDT | Severe Thunderstorm Warning | GGW | 54 min |
| Jun 10, 9:28 PM MDT | Severe Thunderstorm Warning | GGW | 62 min |
| Jun 11, 2:50 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 11, 3:00 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 14, 2:17 PM MDT | Lake Wind Advisory | GGW | 8 hr |
| Jun 14, 5:09 PM MDT | Severe Thunderstorm Warning | GGW | 51 min |
| Jun 16, 12:32 AM MDT | Severe Thunderstorm Warning | GGW | 58 min |
| Jun 18, 3:16 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 18, 3:24 PM MDT | Lake Wind Advisory | GGW | 31 hr |
| Jun 18, 5:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 7:01 PM MDT | Special Weather Statement | GGW | 59 min |
| Jun 21, 3:04 AM MDT | Lake Wind Advisory | GGW | 24 hr |
| Jun 21, 1:46 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jun 24, 2:20 PM MDT | Lake Wind Advisory | GGW | 30 hr |
| Jun 24, 3:47 PM MDT | Special Weather Statement | GGW | 58 min |
| Jun 24, 3:51 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 24, 4:16 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 24, 4:19 PM MDT | Severe Thunderstorm Warning | GGW | 56 min |
| Jul 2, 2:39 PM MDT | Special Weather Statement | GGW | 66 min |
| Jul 2, 5:48 PM MDT | Special Weather Statement | GGW | 42 min |
| Jul 2, 7:12 PM MDT | Special Weather Statement | GGW | 63 min |
| Jul 8, 7:44 PM MDT | Special Weather Statement | GGW | 61 min |
| Jul 8, 9:19 PM MDT | Lake Wind Advisory | GGW | 6 hr |
| Jul 9, 2:30 PM MDT | Special Weather Statement | GGW | 45 min |
| Jul 9, 2:37 PM MDT | Severe Thunderstorm Warning | GGW | 38 min |
| Jul 9, 3:12 PM MDT | Severe Thunderstorm Warning | GGW | 63 min |
| Jul 11, 3:02 AM MDT | Lake Wind Advisory | GGW | 42 hr |
| Jul 19, 3:41 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jul 22, 2:19 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 6:01 PM MDT | Special Weather Statement | GGW | 59 min |
| Jul 22, 9:24 PM MDT | Special Weather Statement | GGW | 66 min |
| Jul 23, 2:51 AM MDT | Lake Wind Advisory | GGW | 18 hr |
| Jul 26, 8:43 PM MDT | Special Weather Statement | GGW | 62 min |
| Jul 26, 9:47 PM MDT | Special Weather Statement | GGW | 28 min |
| Jul 26, 10:14 PM MDT | Special Weather Statement | GGW | 61 min |
| Jul 27, 1:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 3:26 PM MDT | Severe Thunderstorm Warning | GGW | 64 min |
| Jul 27, 4:15 PM MDT | Special Weather Statement | GGW | 60 min |
| Aug 2, 2:22 PM MDT | Lake Wind Advisory | GGW | 36 hr |
| Aug 9, 4:53 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 9, 5:35 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Aug 9, 8:30 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Aug 17, 2:14 PM MDT | Lake Wind Advisory | GGW | 13 hr |
| Aug 22, 2:44 PM MDT | Lake Wind Advisory | GGW | 54 hr |
| Aug 31, 2:23 PM MDT | Fire Weather Watch | GGW | 37 hr |
| Sep 1, 6:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Sep 1, 6:57 PM MDT | Special Weather Statement | GGW | 63 min |
| Sep 2, 3:18 AM MDT | Red Flag Warning | GGW | 18 hr |
| Sep 7, 3:03 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Sep 8, 2:39 AM MDT | Lake Wind Advisory | GGW | 19 hr |
| Sep 11, 2:57 AM MDT | Lake Wind Advisory | GGW | 18 hr |
| Sep 17, 2:09 PM MDT | Lake Wind Advisory | GGW | 31 hr |
| Sep 21, 2:48 PM MDT | Lake Wind Advisory | GGW | 4 days |
| Oct 1, 3:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 2, 8:21 PM MDT | Special Weather Statement | GGW | 54 min |
| Oct 3, 2:43 AM MDT | Lake Wind Advisory | GGW | 66 hr |
| Oct 4, 8:05 AM MDT | Areal Flood Advisory | GGW | 48 hr |
| Oct 4, 12:02 PM MDT | Areal Flood Warning | GGW | 11 days |
| Oct 4, 8:52 PM MDT | Areal Flood Warning | GGW | 6 days |
| Oct 10, 8:41 PM MDT | Winter Weather Advisory | GGW | 18 hr |
| Oct 14, 2:51 AM MDT | Lake Wind Advisory | GGW | 18 hr |
| Oct 16, 2:44 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Oct 16, 6:08 AM MDT | Special Weather Statement | GGW | 52 min |
| Oct 31, 2:53 AM MDT | Lake Wind Advisory | GGW | 24 hr |
| Nov 12, 2:48 PM MST | Lake Wind Advisory | GGW | 24 hr |
| Nov 14, 3:09 AM MST | Lake Wind Advisory | GGW | 17 hr |
| Nov 15, 2:02 PM MST | Lake Wind Advisory | GGW | 27 hr |
| Dec 5, 10:45 PM MST | Wind Chill Advisory | GGW | 36 hr |
| Dec 9, 2:04 PM MST | Winter Weather Advisory | GGW | 37 hr |
| Dec 11, 2:58 AM MST | Wind Chill Advisory | GGW | 54 hr |
| Dec 11, 2:58 AM MST | Winter Weather Advisory | GGW | 32 hr |
| Dec 14, 3:11 AM MST | Winter Storm Watch | GGW | 19 hr |
| Dec 14, 10:06 PM MST | Winter Storm Warning | GGW | 41 hr |
| Dec 15, 2:36 PM MST | Wind Chill Advisory | GGW | 45 hr |
| Dec 16, 2:39 PM MST | Wind Chill Warning | GGW | 21 hr |
| Dec 21, 2:28 PM MST | Winter Storm Watch | GGW | 48 hr |
| Dec 23, 2:52 PM MST | Winter Weather Advisory | GGW | 60 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 archive20152017
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.