Alert archive / Montana / Petroleum County
Weather alerts in Petroleum County, Montana, 2018
123 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 123
- Warnings
- 27
- Watches
- 16
- Advisories
- 56
- Busiest month
- June23 alerts
- Busiest day
- July 10, 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.
Petroleum County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 6 | 25% | 3 | 67% | 17 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 Glasgow, MT: tornado warnings | 3 | 1 | 67% | 2 | 50% | 16 min |
| NWS Glasgow, MT: severe thunderstorm warnings | 108 | 65 | 40% | 166 | 83% | 28 min |
| NWS Glasgow, MT: flash flood warnings | 6 | 5 | 17% | 9 | 67% | 87 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, 3:39 AM MST | Winter Weather Advisory | GGW | 42 hr |
| Jan 10, 3:02 AM MST | Winter Storm Watch | GGW | 24 hr |
| Jan 11, 3:04 AM MST | Winter Storm Warning | GGW | 27 hr |
| Jan 27, 1:43 PM MST | Winter Weather Advisory | GGW | 15 hr |
| Jan 29, 2:39 PM MST | High Wind Watch | GGW | 13 hr |
| Feb 1, 1:45 PM MST | Winter Storm Watch | GGW | 37 hr |
| Feb 2, 3:43 AM MST | Winter Weather Advisory | GGW | 20 hr |
| Feb 3, 2:37 AM MST | Wind Chill Advisory | GGW | 32 hr |
| Feb 3, 2:37 AM MST | Winter Weather Advisory | GGW | 24 hr |
| Feb 3, 2:28 PM MST | Winter Storm Watch | GGW | 12 hr |
| Feb 4, 2:56 AM MST | Winter Storm Warning | GGW | 36 hr |
| Feb 6, 11:29 AM MST | Winter Storm Watch | GGW | 25 hr |
| Feb 7, 12:14 PM MST | Winter Storm Warning | GGW | 39 hr |
| Feb 8, 4:56 PM MST | Wind Chill Advisory | GGW | 42 hr |
| Feb 11, 2:25 PM MST | Wind Chill Advisory | GGW | 45 hr |
| Feb 12, 11:48 AM MST | Wind Chill Advisory | GGW | 21 hr |
| Feb 13, 2:48 PM MST | Winter Weather Advisory | GGW | 44 hr |
| Feb 16, 3:30 AM MST | Winter Storm Watch | GGW | 24 hr |
| Feb 17, 3:13 AM MST | Winter Storm Warning | GGW | 29 hr |
| Feb 19, 2:18 PM MST | Wind Chill Advisory | GGW | 21 hr |
| Feb 20, 10:45 AM MST | Wind Chill Advisory | GGW | 24 hr |
| Feb 25, 10:29 AM MST | Winter Weather Advisory | GGW | 12 hr |
| Mar 2, 3:06 AM MST | Winter Storm Watch | GGW | 48 hr |
| Mar 3, 2:27 PM MST | Winter Storm Warning | GGW | 57 hr |
| Mar 15, 2:33 PM MDT | Winter Weather Advisory | GGW | 32 hr |
| Mar 18, 10:26 AM MDT | Flood Watch | GGW | 9 days |
| Mar 21, 8:46 PM MDT | Areal Flood Warning | GGW | 60 hr |
| Mar 23, 1:59 PM MDT | Areal Flood Advisory | GGW | 8 days |
| Mar 24, 8:46 AM MDT | Areal Flood Warning | GGW | 3 days |
| Mar 27, 12:31 PM MDT | Areal Flood Warning | GGW | 48 hr |
| Mar 31, 2:21 PM MDT | Winter Storm Watch | GGW | 24 hr |
| Apr 1, 3:09 AM MDT | Winter Storm Warning | GGW | 48 hr |
| Apr 4, 1:48 PM MDT | Winter Weather Advisory | GGW | 43 hr |
| Apr 6, 2:28 PM MDT | Winter Weather Advisory | GGW | 45 hr |
| Apr 11, 3:28 AM MDT | Winter Storm Watch | GGW | 24 hr |
| Apr 12, 3:08 AM MDT | Winter Storm Warning | GGW | 33 hr |
| Apr 12, 4:50 PM MDT | Areal Flood Advisory | GGW | 9 days |
| Apr 27, 2:01 PM MDT | Lake Wind Advisory | GGW | 29 hr |
| May 7, 2:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| May 17, 3:41 AM MDT | Lake Wind Advisory | GGW | 30 hr |
| May 22, 6:28 PM MDT | Special Weather Statement | GGW | 47 min |
| May 26, 2:21 PM MDT | Mesoscale Discussion | SPC | 114 min |
| May 29, 3:13 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| May 30, 3:37 PM MDT | Special Weather Statement | GGW | 68 min |
| May 30, 7:39 PM MDT | Special Weather Statement | GGW | 66 min |
| May 30, 7:52 PM MDT | Severe Thunderstorm Warning | GGW | 53 min |
| May 31, 1:50 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 1, 3:06 AM MDT | Lake Wind Advisory | GGW | 40 hr |
| Jun 1, 7:56 PM MDT | River Flood Warning | GGW | 15 hr |
| Jun 4, 1:47 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jun 4, 4:38 PM MDT | Severe Thunderstorm Warning | GGW | 34 min |
| Jun 4, 6:14 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 4, 8:34 PM MDT | Special Weather Statement | GGW | 56 min |
| Jun 4, 8:56 PM MDT | Severe Thunderstorm Warning | GGW | 44 min |
| Jun 7, 10:02 AM MDT | Special Weather Statement | GGW | 58 min |
| Jun 7, 10:16 AM MDT | Severe Thunderstorm Warning | GGW | 44 min |
| Jun 7, 10:24 AM MDT | Mesoscale Discussion | SPC | 66 min |
| Jun 9, 1:58 PM MDT | Lake Wind Advisory | GGW | 55 hr |
| Jun 12, 3:13 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Jun 14, 3:08 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Jun 15, 6:46 PM MDT | Lake Wind Advisory | GGW | 25 hr |
| Jun 18, 3:12 AM MDT | Lake Wind Advisory | GGW | 14 hr |
| Jun 21, 2:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jun 21, 3:25 PM MDT | Special Weather Statement | GGW | 65 min |
| Jun 21, 6:15 PM MDT | Special Weather Statement | GGW | 60 min |
| Jun 21, 7:13 PM MDT | Special Weather Statement | GGW | 62 min |
| Jun 28, 3:56 PM MDT | Special Weather Statement | GGW | 64 min |
| Jun 28, 3:59 PM MDT | Severe Thunderstorm Warning | GGW | 47 min |
| Jun 28, 4:11 PM MDT | Severe Thunderstorm Warning | GGW | 64 min |
| Jun 28, 4:28 PM MDT | Severe Thunderstorm Warning | GGW | 20 min |
| Jul 1, 3:11 AM MDT | Lake Wind Advisory | GGW | 16 hr |
| Jul 3, 2:49 PM MDT | Heat Advisory | GGW | 3 days |
| Jul 4, 3:29 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Jul 5, 3:21 AM MDT | Lake Wind Advisory | GGW | 18 hr |
| Jul 10, 1:50 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 10, 2:14 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 10, 4:25 PM MDT | Special Weather Statement | TFX | 35 min |
| Jul 10, 4:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 4:45 PM MDT | Special Weather Statement | TFX | 15 min |
| Jul 10, 4:54 PM MDT | Severe Thunderstorm Warning | GGW | 66 min |
| Jul 10, 6:32 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jul 11, 3:10 AM MDT | Lake Wind Advisory | GGW | 14 hr |
| Jul 13, 2:19 PM MDT | Lake Wind Advisory | GGW | 30 hr |
| Jul 16, 2:28 PM MDT | Fire Weather Watch | GGW | 36 hr |
| Jul 18, 2:28 AM MDT | Red Flag Warning | GGW | 19 hr |
| Jul 20, 3:11 AM MDT | Lake Wind Advisory | GGW | 30 hr |
| Jul 21, 3:00 PM MDT | Lake Wind Advisory | GGW | 29 hr |
| Jul 27, 4:20 PM MDT | Special Weather Statement | GGW | 55 min |
| Aug 1, 11:26 AM MDT | Red Flag Warning | GGW | 59 hr |
| Aug 3, 4:42 PM MDT | Special Weather Statement | GGW | 33 min |
| Aug 3, 5:26 PM MDT | Special Weather Statement | GGW | 64 min |
| Aug 8, 3:09 AM MDT | Heat Advisory | GGW | 48 hr |
| Aug 8, 3:11 AM MDT | Fire Weather Watch | GGW | 3 days |
| Aug 9, 3:01 AM MDT | Heat Advisory | GGW | 18 hr |
| Aug 9, 3:07 PM MDT | Excessive Heat Warning | GGW | 54 hr |
| Aug 10, 3:21 AM MDT | Red Flag Warning | GGW | 18 hr |
| Aug 11, 3:31 AM MDT | Red Flag Warning | GGW | 19 hr |
| Aug 11, 2:49 PM MDT | Red Flag Warning | GGW | 30 hr |
| Aug 12, 3:30 AM MDT | Lake Wind Advisory | GGW | 18 hr |
| Aug 24, 5:09 PM MDT | Special Weather Statement | GGW | 66 min |
| Aug 29, 2:44 PM MDT | Lake Wind Advisory | GGW | 27 hr |
| Aug 31, 3:07 PM MDT | Lake Wind Advisory | GGW | 29 hr |
| Sep 2, 11:01 PM MDT | Lake Wind Advisory | GGW | 28 hr |
| Sep 15, 2:34 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Sep 25, 2:57 AM MDT | Lake Wind Advisory | GGW | 16 hr |
| Sep 26, 2:51 AM MDT | Lake Wind Advisory | GGW | 17 hr |
| Oct 3, 9:31 PM MDT | Lake Wind Advisory | GGW | 20 hr |
| Oct 9, 3:18 AM MDT | Lake Wind Advisory | GGW | 19 hr |
| Oct 12, 2:55 PM MDT | Lake Wind Advisory | GGW | 29 hr |
| Oct 14, 2:53 PM MDT | Lake Wind Advisory | GGW | 28 hr |
| Oct 26, 2:07 PM MDT | Lake Wind Advisory | GGW | 27 hr |
| Oct 31, 2:18 PM MDT | Lake Wind Advisory | GGW | 29 hr |
| Nov 4, 1:44 PM MST | Lake Wind Advisory | GGW | 54 hr |
| Nov 8, 2:04 PM MST | Lake Wind Advisory | GGW | 5 hr |
| Nov 9, 3:26 AM MST | Lake Wind Advisory | GGW | 43 hr |
| Nov 15, 3:07 AM MST | Winter Weather Advisory | GGW | 38 hr |
| Nov 29, 4:19 AM MST | Winter Storm Watch | GGW | 24 hr |
| Nov 30, 4:09 AM MST | Winter Storm Warning | GGW | 35 hr |
| Nov 30, 4:09 AM MST | Winter Weather Advisory | GGW | 62 hr |
| Dec 18, 3:15 AM MST | High Wind Watch | GGW | 19 hr |
| Dec 18, 9:45 PM MST | High Wind Warning | GGW | 18 hr |
| Dec 25, 3:01 AM MST | Winter Weather Advisory | GGW | 39 hr |
| Dec 30, 8:23 AM MST | Winter Weather Advisory | GGW | 9 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.