Alert archive / Montana / Roosevelt County
Weather alerts in Roosevelt County, Montana, 2015
98 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Roosevelt County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 98
- Warnings
- 24
- Watches
- 17
- Advisories
- 36
- Busiest month
- June23 alerts
- Busiest day
- June 19, 20158 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Roosevelt County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 11 | 15% | 6 | 67% | 31 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: tornado warnings | 0 | 1 | 0% | |||
| NWS Glasgow, MT: severe thunderstorm warnings | 65 | 39 | 40% | 86 | 72% | 24 min |
| NWS Glasgow, MT: flash flood warnings | 3 | 0 | 100% | 4 | 0% |
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 1, 2:53 AM MST | Winter Storm Watch | GGW | 24 hr |
| Jan 2, 2:55 AM MST | Winter Weather Advisory | GGW | 28 hr |
| Jan 3, 3:53 AM MST | Wind Chill Advisory | GGW | 48 hr |
| Jan 3, 2:48 PM MST | Winter Weather Advisory | GGW | 3 days |
| Jan 5, 2:44 PM MST | Wind Chill Advisory | GGW | 46 hr |
| Jan 6, 3:08 AM MST | Wind Chill Warning | GGW | 34 hr |
| Jan 7, 2:04 PM MST | Winter Weather Advisory | GGW | 15 hr |
| Jan 8, 3:21 AM MST | Wind Chill Advisory | GGW | 32 hr |
| Jan 8, 5:11 AM MST | Blizzard Warning | GGW | 7 hr |
| Jan 8, 8:25 AM MST | Winter Weather Advisory | GGW | 8 hr |
| Jan 9, 2:24 PM MST | Wind Chill Advisory | GGW | 18 hr |
| Jan 11, 2:18 PM MST | Wind Chill Advisory | GGW | 20 hr |
| Jan 18, 8:53 AM MST | Freezing Rain Advisory | GGW | 8 hr |
| Jan 30, 2:27 PM MST | Winter Weather Advisory | GGW | 32 hr |
| Feb 2, 3:21 AM MST | Winter Weather Advisory | GGW | 30 hr |
| Feb 3, 2:26 PM MST | Wind Chill Advisory | GGW | 21 hr |
| Feb 4, 8:37 PM MST | Freezing Rain Advisory | GGW | 25 hr |
| Feb 7, 2:33 PM MST | Freezing Rain Advisory | GGW | 20 hr |
| Feb 8, 9:03 PM MST | Dense Fog Advisory | GGW | 32 hr |
| Feb 9, 3:11 AM MST | Freezing Rain Advisory | GGW | 24 hr |
| Feb 13, 2:07 PM MST | Winter Weather Advisory | GGW | 27 hr |
| Feb 16, 2:28 PM MST | Wind Chill Advisory | GGW | 21 hr |
| Feb 17, 2:52 PM MST | Wind Chill Advisory | GGW | 18 hr |
| Feb 20, 11:06 AM MST | Wind Chill Advisory | GGW | 46 hr |
| Feb 25, 3:19 AM MST | Wind Chill Advisory | GGW | 31 hr |
| Feb 26, 8:08 PM MST | Wind Chill Advisory | GGW | 13 hr |
| Mar 2, 3:14 AM MST | Wind Chill Advisory | GGW | 57 hr |
| Mar 14, 4:56 AM MDT | Areal Flood Warning | GGW | 31 hr |
| Mar 14, 3:11 PM MDT | Flash Flood Watch | GGW | 21 hr |
| Mar 15, 2:35 PM MDT | Winter Weather Advisory | GGW | 20 hr |
| Mar 23, 3:27 AM MDT | Winter Weather Advisory | GGW | 35 hr |
| Mar 30, 1:37 PM MDT | Red Flag Warning | GGW | 55 hr |
| Apr 5, 3:29 AM MDT | Winter Storm Watch | GGW | 10 hr |
| Apr 5, 1:58 PM MDT | Winter Weather Advisory | GGW | 42 hr |
| Apr 13, 2:36 PM MDT | Red Flag Warning | GGW | 30 hr |
| Jun 5, 9:15 AM MDT | Flash Flood Watch | GGW | 18 hr |
| Jun 5, 3:31 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 4:02 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 5, 6:41 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 8:42 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jun 19, 12:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 1:38 PM MDT | Severe Thunderstorm Warning | GGW | 52 min |
| Jun 19, 2:01 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 19, 2:22 PM MDT | Severe Thunderstorm Warning | GGW | 53 min |
| Jun 19, 3:15 PM MDT | Severe Thunderstorm Warning | GGW | 60 min |
| Jun 19, 4:12 PM MDT | Severe Thunderstorm Warning | GGW | 18 min |
| Jun 19, 4:25 PM MDT | Severe Thunderstorm Warning | GGW | 20 min |
| Jun 19, 4:48 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Jun 21, 1:10 PM MDT | Special Weather Statement | GGW | 50 min |
| Jun 21, 1:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 2:23 PM MDT | Tornado Watch | SPC | 8 hr |
| Jun 21, 4:24 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Jun 23, 1:05 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jun 29, 8:12 PM MDT | Dense Smoke Advisory | GGW | 16 hr |
| Jun 30, 2:49 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jun 30, 4:29 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 30, 4:58 PM MDT | Severe Thunderstorm Warning | GGW | 41 min |
| Jun 30, 5:37 PM MDT | Special Weather Statement | GGW | 53 min |
| Jun 30, 6:19 PM MDT | Severe Thunderstorm Warning | GGW | 56 min |
| Jul 1, 1:43 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 1, 3:06 PM MDT | Special Weather Statement | GGW | 54 min |
| Jul 1, 3:09 PM MDT | Severe Thunderstorm Warning | GGW | 66 min |
| Jul 1, 5:24 PM MDT | Special Weather Statement | GGW | 66 min |
| Jul 4, 12:43 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 4, 1:47 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 3:15 PM MDT | Severe Thunderstorm Warning | GGW | 43 min |
| Jul 4, 9:54 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 15, 2:53 PM MDT | Special Weather Statement | GGW | 52 min |
| Jul 23, 2:37 PM MDT | Red Flag Warning | GGW | 30 hr |
| Jul 27, 3:40 AM MDT | High Wind Watch | GGW | 11 hr |
| Jul 27, 4:09 AM MDT | Flood Watch | GGW | 53 hr |
| Jul 27, 2:25 PM MDT | High Wind Warning | GGW | 30 hr |
| Jul 27, 2:58 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 3:44 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 5:51 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 6:31 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 7:40 PM MDT | Severe Thunderstorm Warning | GGW | 65 min |
| Jul 27, 7:44 PM MDT | Severe Thunderstorm Warning | GGW | 61 min |
| Jul 27, 8:19 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 27, 8:43 PM MDT | Severe Thunderstorm Warning | GGW | 62 min |
| Aug 13, 3:39 AM MDT | Fire Weather Watch | GGW | 24 hr |
| Aug 14, 3:36 AM MDT | Red Flag Warning | GGW | 41 hr |
| Aug 28, 1:00 PM MDT | Dense Smoke Advisory | GGW | 48 hr |
| Aug 30, 7:55 PM MDT | Severe Thunderstorm Warning | GGW | 50 min |
| Aug 30, 8:35 PM MDT | Special Weather Statement | GGW | 55 min |
| Aug 30, 9:19 PM MDT | Special Weather Statement | GGW | 56 min |
| Oct 9, 9:49 AM MDT | High Wind Watch | GGW | 29 hr |
| Oct 10, 2:19 PM MDT | High Wind Warning | GGW | 37 hr |
| Oct 10, 2:21 PM MDT | Red Flag Warning | GGW | 30 hr |
| Nov 9, 8:08 PM MST | Dense Fog Advisory | GGW | 13 hr |
| Nov 16, 3:22 AM MST | High Wind Watch | GGW | 24 hr |
| Nov 17, 3:07 AM MST | High Wind Warning | GGW | 48 hr |
| Nov 30, 12:45 AM MST | Freezing Fog Advisory | GGW | 11 hr |
| Dec 12, 7:22 AM MST | Freezing Rain Advisory | GGW | 3 hr |
| Dec 12, 3:56 PM MST | Dense Fog Advisory | GGW | 17 hr |
| Dec 14, 3:07 AM MST | Winter Weather Advisory | GGW | 35 hr |
| Dec 19, 2:44 AM MST | Winter Weather Advisory | GGW | 11 hr |
| Dec 20, 8:26 AM MST | Dense Fog Advisory | GGW | 24 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 archive20142016
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.