Alert archive / Montana / Roosevelt County
Weather alerts in Roosevelt County, Montana, 2023
112 weather alerts in 2023, 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 2023. Tap one for its archive.
- Alerts
- 112
- Warnings
- 31
- Watches
- 10
- Advisories
- 39
- Busiest month
- July26 alerts
- Busiest day
- July 30, 20238 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, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 9 | 44% | 17 | 82% | 34 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: tornado warnings | 1 | 0 | 100% | 2 | 0% | |
| NWS Glasgow, MT: severe thunderstorm warnings | 73 | 26 | 64% | 69 | 74% | 33 min |
| NWS Glasgow, MT: flash flood warnings | 8 | 2 | 75% | 7 | 29% | 11 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, 9:50 AM MST | Dense Fog Advisory | GGW | 53 hr |
| Jan 5, 7:39 PM MST | Dense Fog Advisory | GGW | 15 hr |
| Jan 10, 6:57 PM MST | Dense Fog Advisory | GGW | 44 hr |
| Jan 12, 6:59 PM MST | Dense Fog Advisory | GGW | 13 hr |
| Jan 14, 7:11 PM MST | Dense Fog Advisory | GGW | 63 hr |
| Jan 18, 7:02 PM MST | Dense Fog Advisory | GGW | 40 hr |
| Jan 25, 2:38 AM MST | High Wind Watch | GGW | 12 hr |
| Jan 25, 2:15 PM MST | High Wind Warning | GGW | 33 hr |
| Jan 27, 12:31 PM MST | Wind Chill Advisory | GGW | 3 days |
| Jan 30, 12:55 PM MST | Wind Chill Advisory | GGW | 19 hr |
| Feb 1, 7:07 PM MST | Wind Chill Advisory | GGW | 35 hr |
| Feb 20, 2:40 AM MST | Winter Storm Warning | GGW | 36 hr |
| Feb 20, 2:40 AM MST | Winter Weather Advisory | GGW | 39 hr |
| Feb 20, 2:34 PM MST | Blizzard Warning | GGW | 24 hr |
| Feb 21, 2:38 PM MST | Wind Chill Advisory | GGW | 4 days |
| Feb 27, 7:58 PM MST | Winter Weather Advisory | GGW | 33 hr |
| Mar 4, 2:12 PM MST | Winter Weather Advisory | GGW | 3 days |
| Mar 9, 2:44 AM MST | Winter Storm Watch | GGW | 24 hr |
| Mar 10, 3:05 AM MST | Blizzard Warning | GGW | 41 hr |
| Mar 10, 3:05 AM MST | Winter Weather Advisory | GGW | 39 hr |
| Mar 10, 9:44 AM MST | Winter Storm Warning | GGW | 32 hr |
| Mar 10, 4:51 PM MST | Mesoscale Discussion | SPC | 4 hr |
| Mar 11, 6:07 PM MST | Blizzard Warning | GGW | 104 min |
| Mar 14, 2:44 AM MDT | Winter Weather Advisory | GGW | 48 hr |
| Mar 14, 1:35 PM MDT | Winter Storm Warning | GGW | 37 hr |
| Mar 16, 2:13 PM MDT | Wind Chill Advisory | GGW | 43 hr |
| Mar 18, 1:26 AM MDT | Dense Fog Advisory | GGW | 10 hr |
| Mar 23, 3:08 AM MDT | Dense Fog Advisory | GGW | 8 hr |
| Mar 24, 2:23 AM MDT | Dense Fog Advisory | GGW | 8 hr |
| Mar 26, 2:57 AM MDT | Dense Fog Advisory | GGW | 7 hr |
| Apr 1, 2:21 AM MDT | Winter Weather Advisory | GGW | 31 hr |
| Apr 2, 2:24 PM MDT | Winter Weather Advisory | GGW | 21 hr |
| Apr 9, 8:54 PM MDT | Areal Flood Advisory | GGW | 7 days |
| Apr 11, 11:05 AM MDT | River Flood Warning | GGW | 19 hr |
| Apr 12, 2:42 PM MDT | Winter Weather Advisory | GGW | 36 hr |
| Apr 13, 3:14 PM MDT | River Flood Warning | GGW | 36 hr |
| Apr 17, 2:13 PM MDT | Winter Storm Watch | GGW | 25 hr |
| Apr 18, 2:56 PM MDT | Winter Storm Warning | GGW | 36 hr |
| Apr 20, 2:31 AM MDT | Winter Weather Advisory | GGW | 12 hr |
| May 9, 2:32 AM MDT | Flood Watch | GGW | 72 hr |
| May 17, 7:23 AM MDT | Dense Smoke Advisory | GGW | 19 hr |
| May 20, 7:43 PM MDT | Dense Smoke Advisory | GGW | 18 hr |
| May 25, 9:56 AM MDT | Flood Watch | GGW | 62 hr |
| May 25, 12:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| May 25, 9:10 PM MDT | Special Weather Statement | GGW | 65 min |
| May 25, 10:37 PM MDT | Special Weather Statement | GGW | 53 min |
| May 25, 11:59 PM MDT | Areal Flood Advisory | GGW | 10 hr |
| May 27, 5:54 PM MDT | Mesoscale Discussion | SPC | 96 min |
| May 27, 7:39 PM MDT | Special Weather Statement | GGW | 66 min |
| May 27, 8:42 PM MDT | Special Weather Statement | GGW | 63 min |
| May 27, 9:38 PM MDT | Special Weather Statement | GGW | 52 min |
| May 27, 10:26 PM MDT | Special Weather Statement | GGW | 64 min |
| May 29, 12:54 PM MDT | Special Weather Statement | GGW | 66 min |
| May 29, 3:36 PM MDT | Special Weather Statement | GGW | 54 min |
| May 30, 6:41 PM MDT | Special Weather Statement | GGW | 64 min |
| May 31, 1:41 PM MDT | Flood Watch | GGW | 4 days |
| Jun 1, 9:17 PM MDT | Special Weather Statement | GGW | 58 min |
| Jun 1, 10:11 PM MDT | Special Weather Statement | GGW | 64 min |
| Jun 1, 11:14 PM MDT | Special Weather Statement | GGW | 61 min |
| Jun 4, 5:21 PM MDT | Severe Thunderstorm Warning | GGW | 28 min |
| Jun 30, 2:29 PM MDT | Special Weather Statement | GGW | 61 min |
| Jun 30, 3:31 PM MDT | Special Weather Statement | GGW | 59 min |
| Jul 1, 3:18 PM MDT | Special Weather Statement | GGW | 57 min |
| Jul 1, 3:52 PM MDT | Special Weather Statement | GGW | 53 min |
| Jul 1, 4:20 PM MDT | Special Weather Statement | GGW | 55 min |
| Jul 1, 5:15 PM MDT | Special Weather Statement | GGW | 60 min |
| Jul 11, 1:56 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 11, 2:26 PM MDT | Special Weather Statement | GGW | 64 min |
| Jul 11, 2:37 PM MDT | Severe Thunderstorm Warning | GGW | 53 min |
| Jul 11, 3:25 PM MDT | Severe Thunderstorm Warning | GGW | 65 min |
| Jul 13, 6:20 PM MDT | Special Weather Statement | GGW | 55 min |
| Jul 14, 3:18 PM MDT | Dense Smoke Advisory | GGW | 47 hr |
| Jul 17, 10:39 PM MDT | Severe Thunderstorm Warning | GGW | 49 min |
| Jul 21, 2:17 PM MDT | Heat Advisory | GGW | 4 days |
| Jul 22, 10:25 PM MDT | Severe Thunderstorm Warning | GGW | 65 min |
| Jul 22, 11:24 PM MDT | Severe Thunderstorm Warning | GGW | 66 min |
| Jul 26, 2:30 AM MDT | Red Flag Warning | GGW | 19 hr |
| Jul 30, 2:15 AM MDT | Severe Thunderstorm Warning | GGW | 35 min |
| Jul 30, 2:41 AM MDT | Special Weather Statement | GGW | 64 min |
| Jul 30, 3:23 AM MDT | Severe Thunderstorm Warning | GGW | 45 min |
| Jul 30, 3:43 AM MDT | Special Weather Statement | GGW | 62 min |
| Jul 30, 4:28 AM MDT | Severe Thunderstorm Warning | GGW | 50 min |
| Jul 30, 3:42 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jul 30, 4:38 PM MDT | Severe Thunderstorm Warning | GGW | 67 min |
| Jul 30, 5:43 PM MDT | Severe Thunderstorm Warning | GGW | 62 min |
| Jul 30, 11:42 PM MDT | Severe Thunderstorm Warning | GGW | 63 min |
| Jul 31, 12:42 AM MDT | Special Weather Statement | GGW | 63 min |
| Jul 31, 1:30 AM MDT | Special Weather Statement | GGW | 60 min |
| Aug 1, 4:59 AM MDT | Severe Thunderstorm Warning | GGW | 61 min |
| Aug 1, 2:52 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 1, 4:23 PM MDT | Severe Thunderstorm Warning | GGW | 56 min |
| Aug 3, 3:05 PM MDT | Special Weather Statement | GGW | 55 min |
| Aug 16, 2:36 PM MDT | Fire Weather Watch | GGW | 23 hr |
| Aug 17, 2:41 AM MDT | Heat Advisory | GGW | 43 hr |
| Aug 17, 2:05 PM MDT | Red Flag Warning | GGW | 31 hr |
| Aug 30, 8:31 PM MDT | Special Weather Statement | GGW | 59 min |
| Aug 30, 8:52 PM MDT | Severe Thunderstorm Warning | GGW | 53 min |
| Aug 30, 9:40 PM MDT | Areal Flood Advisory | GGW | 4 hr |
| Aug 30, 9:44 PM MDT | Severe Thunderstorm Warning | GGW | 33 min |
| Sep 3, 7:30 PM MDT | Special Weather Statement | GGW | 60 min |
| Sep 3, 8:31 PM MDT | Special Weather Statement | GGW | 59 min |
| Sep 4, 11:30 AM MDT | Dense Smoke Advisory | GGW | 39 hr |
| Sep 16, 1:38 PM MDT | Red Flag Warning | GGW | 55 hr |
| Oct 16, 10:01 AM MDT | High Wind Warning | GGW | 43 hr |
| Oct 23, 3:11 AM MDT | Winter Storm Watch | GGW | 35 hr |
| Oct 24, 2:43 AM MDT | Winter Storm Warning | GGW | 63 hr |
| Oct 24, 1:55 PM MDT | Winter Weather Advisory | GGW | 62 hr |
| Nov 2, 5:23 AM MDT | Dense Fog Advisory | GGW | 6 hr |
| Nov 2, 2:02 PM MDT | Winter Weather Advisory | GGW | 22 hr |
| Nov 3, 5:14 PM MDT | Dense Fog Advisory | GGW | 27 hr |
| Dec 6, 2:08 PM MST | Winter Weather Advisory | GGW | 48 hr |
| Dec 31, 12:02 AM MST | Dense Fog Advisory | GGW | 12 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 | 2 |
| Mesoscale Discussion | 4 |
| Special Weather Statement | 28 |
| Flooding | |
| River Flood Warning | 2 |
| Flood Watch | 3 |
| Areal Flood Advisory | 3 |
| Winter | |
| Blizzard Warning | 3 |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 12 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 1 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 13 |
| Dense Smoke Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.