Alert archive / Montana / Roosevelt County
Weather alerts in Roosevelt County, Montana, 2009
114 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 114
- Warnings
- 43
- Watches
- 17
- Advisories
- 37
- Busiest month
- July29 alerts
- Busiest day
- August 24, 20098 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 4 tornado warnings covering Roosevelt County in 2009 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Roosevelt County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 24 | 12 | 50% | 13 | 69% | 31 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: tornado warnings | 18 | 2 | 89% | 7 | 43% | 13 min |
| NWS Glasgow, MT: severe thunderstorm warnings | 105 | 58 | 45% | 157 | 68% | 27 min |
| NWS Glasgow, MT: flash flood warnings | 4 | 0 | 100% | 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, 1:48 AM MST | Winter Weather Advisory | GGW | 8 hr |
| Jan 1, 9:24 PM MST | Winter Weather Advisory | GGW | 37 hr |
| Jan 3, 3:55 AM MST | Wind Chill Advisory | GGW | 15 hr |
| Jan 6, 3:03 PM MST | Winter Weather Advisory | GGW | 24 hr |
| Jan 7, 3:48 AM MST | Winter Storm Watch | GGW | 24 hr |
| Jan 8, 3:18 AM MST | Winter Storm Warning | GGW | 32 hr |
| Jan 8, 3:18 AM MST | Winter Weather Advisory | GGW | 7 hr |
| Jan 8, 10:28 AM MST | Ice Storm Warning | GGW | 11 hr |
| Jan 8, 11:55 AM MST | Mesoscale Discussion | SPC | 5 hr |
| Jan 8, 3:04 PM MST | Winter Weather Advisory | GGW | 20 hr |
| Jan 10, 2:45 PM MST | High Wind Watch | GGW | 24 hr |
| Jan 11, 4:07 AM MST | Blizzard Warning | GGW | 24 hr |
| Jan 13, 2:50 PM MST | Wind Chill Advisory | GGW | 13 hr |
| Jan 13, 2:50 PM MST | Winter Weather Advisory | GGW | 8 hr |
| Jan 13, 5:41 PM MST | High Wind Warning | GGW | 3 hr |
| Jan 22, 3:40 AM MST | Wind Chill Advisory | GGW | 37 hr |
| Jan 22, 12:09 PM MST | Winter Weather Advisory | GGW | 15 hr |
| Jan 26, 9:17 PM MST | Wind Chill Advisory | GGW | 13 hr |
| Jan 31, 4:02 AM MST | High Wind Warning | GGW | 8 hr |
| Feb 9, 7:32 AM MST | Dense Fog Advisory | GGW | 5 hr |
| Feb 17, 3:27 AM MST | Dense Fog Advisory | GGW | 8 hr |
| Feb 19, 2:58 PM MST | Winter Weather Advisory | GGW | 13 hr |
| Feb 23, 2:57 PM MST | Winter Weather Advisory | GGW | 22 hr |
| Feb 25, 3:22 AM MST | Winter Weather Advisory | GGW | 56 hr |
| Feb 26, 2:58 PM MST | Wind Chill Advisory | GGW | 20 hr |
| Mar 3, 10:37 PM MST | Freezing Rain Advisory | GGW | 5 hr |
| Mar 4, 7:42 AM MST | Dense Fog Advisory | GGW | 5 hr |
| Mar 4, 9:20 PM MST | Dense Fog Advisory | GGW | 10 hr |
| Mar 8, 2:34 PM MDT | Wind Chill Advisory | GGW | 54 hr |
| Mar 21, 11:20 AM MDT | Areal Flood Advisory | GGW | 24 hr |
| Mar 27, 3:10 PM MDT | Winter Storm Watch | GGW | 24 hr |
| Mar 28, 3:16 PM MDT | Winter Weather Advisory | GGW | 37 hr |
| Apr 22, 8:05 AM MDT | Red Flag Warning | GGW | 12 hr |
| May 10, 2:42 PM MDT | Severe Thunderstorm Warning | GGW | 23 min |
| May 14, 6:10 PM MDT | Severe Thunderstorm Warning | GGW | 48 min |
| May 19, 8:53 PM MDT | Severe Thunderstorm Warning | GGW | 67 min |
| May 19, 9:04 PM MDT | Severe Thunderstorm Warning | GGW | 56 min |
| May 19, 10:00 PM MDT | Severe Thunderstorm Warning | GGW | 30 min |
| Jun 24, 3:21 PM MDT | Red Flag Warning | GGW | 5 hr |
| Jun 25, 3:50 AM MDT | Red Flag Warning | GGW | 17 hr |
| Jun 25, 6:31 PM MDT | Severe Thunderstorm Warning | GGW | 29 min |
| Jun 30, 3:19 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 3:40 PM MDT | Tornado Warning | GGW | 24 min |
| Jun 30, 3:59 PM MDT | Severe Thunderstorm Warning | GGW | 61 min |
| Jul 3, 2:21 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jul 3, 4:31 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 3, 6:22 PM MDT | Severe Thunderstorm Warning | GGW | 53 min |
| Jul 3, 6:56 PM MDT | Severe Thunderstorm Warning | GGW | 64 min |
| Jul 3, 7:57 PM MDT | Severe Thunderstorm Warning | GGW | 63 min |
| Jul 3, 8:04 PM MDT | Severe Thunderstorm Warning | GGW | 56 min |
| Jul 3, 9:18 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Jul 5, 3:41 PM MDT | Severe Thunderstorm Warning | GGW | 64 min |
| Jul 5, 3:48 PM MDT | Mesoscale Discussion | SPC | 57 min |
| Jul 5, 3:55 PM MDT | Tornado Warning | GGW | 35 min |
| Jul 5, 4:30 PM MDT | Tornado Warning | GGW | 45 min |
| Jul 6, 7:23 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 6, 9:36 PM MDT | Severe Thunderstorm Warning | GGW | 54 min |
| Jul 6, 9:44 PM MDT | Severe Thunderstorm Warning | GGW | 61 min |
| Jul 6, 10:11 PM MDT | Tornado Warning | GGW | 34 min |
| Jul 6, 10:30 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jul 6, 10:43 PM MDT | Severe Thunderstorm Warning | GGW | 62 min |
| Jul 7, 1:38 AM MDT | Areal Flood Warning | GGW | 5 hr |
| Jul 8, 10:28 AM MDT | Flash Flood Watch | GGW | 9 hr |
| Jul 8, 10:38 AM MDT | Mesoscale Discussion | SPC | 97 min |
| Jul 8, 12:38 PM MDT | Severe Thunderstorm Warning | GGW | 22 min |
| Jul 8, 1:02 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 13, 5:05 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 13, 6:11 PM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 13, 7:06 PM MDT | Severe Thunderstorm Warning | GGW | 54 min |
| Jul 17, 2:54 PM MDT | Fire Weather Watch | GGW | 24 hr |
| Jul 18, 2:58 PM MDT | Red Flag Warning | GGW | 30 hr |
| Jul 22, 2:52 PM MDT | Fire Weather Watch | GGW | 13 hr |
| Jul 23, 3:57 AM MDT | Red Flag Warning | GGW | 17 hr |
| Aug 12, 9:03 PM MDT | Special Weather Statement | GGW | 57 min |
| Aug 14, 1:50 AM MDT | Severe Thunderstorm Warning | GGW | 40 min |
| Aug 14, 5:10 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Aug 14, 8:00 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 14, 10:47 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Aug 15, 1:31 AM MDT | Mesoscale Discussion | SPC | 89 min |
| Aug 23, 7:02 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Aug 23, 7:55 PM MDT | Tornado Watch | SPC | 5 hr |
| Aug 23, 8:30 PM MDT | Severe Thunderstorm Warning | GGW | 60 min |
| Aug 23, 8:59 PM MDT | Severe Thunderstorm Warning | GGW | 61 min |
| Aug 23, 9:28 PM MDT | Severe Thunderstorm Warning | GGW | 30 min |
| Aug 23, 9:46 PM MDT | Severe Thunderstorm Warning | GGW | 59 min |
| Aug 23, 10:12 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Aug 23, 10:32 PM MDT | Severe Thunderstorm Warning | GGW | 41 min |
| Sep 8, 2:44 PM MDT | Red Flag Warning | GGW | 28 hr |
| Sep 13, 1:44 PM MDT | Mesoscale Discussion | SPC | 61 min |
| Sep 13, 2:35 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 13, 6:29 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Sep 13, 9:52 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Sep 13, 10:11 PM MDT | Severe Thunderstorm Warning | GGW | 64 min |
| Sep 18, 4:05 AM MDT | Fire Weather Watch | GGW | 23 hr |
| Sep 19, 3:31 AM MDT | Red Flag Warning | GGW | 20 hr |
| Sep 24, 8:05 PM MDT | Fire Weather Watch | GGW | 19 hr |
| Sep 25, 3:00 PM MDT | Red Flag Warning | GGW | 30 hr |
| Nov 29, 6:40 AM MST | Dense Fog Advisory | GGW | 2 hr |
| Dec 9, 2:55 PM MST | Wind Chill Advisory | GGW | 18 hr |
| Dec 11, 3:06 PM MST | Winter Storm Watch | GGW | 13 hr |
| Dec 12, 4:19 AM MST | Wind Chill Warning | GGW | 24 hr |
| Dec 12, 4:19 AM MST | Winter Weather Advisory | GGW | 37 hr |
| Dec 14, 4:25 PM MST | Wind Chill Advisory | GGW | 12 hr |
| Dec 15, 11:15 AM MST | Wind Chill Advisory | GGW | 105 min |
| Dec 15, 1:05 PM MST | Wind Chill Advisory | GGW | 105 min |
| Dec 17, 2:59 AM MST | Dense Fog Advisory | GGW | 7 hr |
| Dec 18, 6:32 PM MST | Dense Fog Advisory | GGW | 15 hr |
| Dec 20, 7:52 AM MST | Dense Fog Advisory | GGW | 13 hr |
| Dec 20, 3:51 PM MST | Winter Weather Advisory | GGW | 22 hr |
| Dec 22, 3:44 AM MST | Winter Storm Watch | GGW | 23 hr |
| Dec 23, 3:01 AM MST | Winter Weather Advisory | GGW | 17 hr |
| Dec 23, 3:14 PM MST | Wind Chill Advisory | GGW | 68 hr |
| Dec 24, 3:22 PM MST | Winter Weather Advisory | GGW | 49 hr |
| Dec 28, 9:23 AM MST | Dense Fog Advisory | GGW | 4 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 archive20082010
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.