Alert archive / Montana / Rosebud County
Weather alerts in Rosebud County, Montana, 2009
91 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Rosebud County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 91
- Warnings
- 27
- Watches
- 15
- Advisories
- 18
- Busiest month
- July23 alerts
- Busiest day
- July 2, 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.
Rosebud County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 15 | 3 | 80% | 4 | 75% | 39 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Billings, MT: severe thunderstorm warnings | 85 | 28 | 67% | 63 | 60% | 23 min |
| NWS Billings, MT: flash flood warnings | 8 | 3 | 63% | 8 | 50% | 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, 12:41 AM MST | Freezing Rain Advisory | BYZ | 9 hr |
| Jan 2, 8:56 PM MST | Wind Chill Advisory | BYZ | 21 hr |
| Jan 6, 3:37 PM MST | Winter Weather Advisory | BYZ | 43 hr |
| Jan 8, 10:18 AM MST | Ice Storm Warning | BYZ | 6 hr |
| Jan 13, 3:23 PM MST | Winter Weather Advisory | BYZ | 35 hr |
| Jan 15, 9:16 AM MST | Winter Weather Advisory | BYZ | 12 hr |
| Feb 19, 3:06 PM MST | Winter Weather Advisory | BYZ | 23 hr |
| Feb 25, 3:43 AM MST | Winter Weather Advisory | BYZ | 24 hr |
| Feb 26, 3:44 AM MST | Winter Storm Warning | BYZ | 32 hr |
| Mar 7, 3:16 PM MST | Winter Weather Advisory | BYZ | 61 hr |
| Mar 8, 4:42 AM MDT | Winter Storm Warning | BYZ | 49 hr |
| Mar 21, 4:29 AM MDT | Blizzard Watch | BYZ | 35 hr |
| Mar 22, 3:58 PM MDT | Winter Storm Warning | BYZ | 29 hr |
| Mar 27, 3:11 PM MDT | Winter Storm Watch | BYZ | 22 hr |
| Mar 28, 3:11 AM MDT | Blizzard Watch | BYZ | 25 hr |
| Mar 28, 12:49 PM MDT | Winter Storm Warning | BYZ | 51 hr |
| Mar 29, 3:48 AM MDT | Blizzard Warning | BYZ | 38 hr |
| Mar 29, 9:03 PM MDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 2, 4:23 AM MDT | Winter Storm Watch | BYZ | 12 hr |
| Apr 2, 3:53 PM MDT | Winter Weather Advisory | BYZ | 42 hr |
| Apr 22, 9:12 AM MDT | Red Flag Warning | BYZ | 11 hr |
| May 24, 8:23 PM MDT | Flash Flood Warning | BYZ | 6 hr |
| Jun 20, 9:59 PM MDT | Severe Thunderstorm Warning | BYZ | 31 min |
| Jun 20, 10:44 PM MDT | Severe Thunderstorm Warning | BYZ | 31 min |
| Jun 20, 11:41 PM MDT | Special Weather Statement | BYZ | 49 min |
| Jun 30, 2:35 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 2, 11:23 AM MDT | Severe Thunderstorm Warning | BYZ | 43 min |
| Jul 2, 11:25 AM MDT | Mesoscale Discussion | SPC | 65 min |
| Jul 2, 11:41 AM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 2, 12:40 PM MDT | Special Weather Statement | BYZ | 50 min |
| Jul 2, 1:04 PM MDT | Severe Thunderstorm Warning | BYZ | 30 min |
| Jul 2, 1:08 PM MDT | Severe Thunderstorm Warning | BYZ | 52 min |
| Jul 2, 1:49 PM MDT | Severe Thunderstorm Warning | BYZ | 40 min |
| Jul 2, 2:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 2, 6:29 PM MDT | Mesoscale Discussion | SPC | 61 min |
| Jul 6, 1:05 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 6, 5:00 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 6, 7:35 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 7, 10:35 PM MDT | Special Weather Statement | BYZ | 55 min |
| Jul 8, 12:23 AM MDT | Special Weather Statement | BYZ | 67 min |
| Jul 12, 9:01 PM MDT | Special Weather Statement | BYZ | 59 min |
| Jul 12, 9:18 PM MDT | Severe Thunderstorm Warning | BYZ | 28 min |
| Jul 13, 1:12 AM MDT | Special Weather Statement | BYZ | 63 min |
| Jul 13, 12:10 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jul 13, 1:02 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 13, 5:01 PM MDT | Special Weather Statement | BYZ | 59 min |
| Jul 13, 5:05 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 13, 7:43 PM MDT | Severe Thunderstorm Warning | BYZ | 54 min |
| Jul 13, 10:42 PM MDT | Special Weather Statement | BYZ | 63 min |
| Aug 6, 4:41 AM MDT | Special Weather Statement | BYZ | 49 min |
| Aug 6, 6:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Aug 6, 9:07 PM MDT | Special Weather Statement | BYZ | 53 min |
| Aug 7, 11:50 AM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 7, 2:38 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 7, 4:15 PM MDT | Flash Flood Watch | BYZ | 6 hr |
| Aug 7, 5:26 PM MDT | Severe Thunderstorm Warning | BYZ | 64 min |
| Aug 7, 5:47 PM MDT | Severe Thunderstorm Warning | BYZ | 58 min |
| Aug 7, 5:55 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Aug 7, 6:30 PM MDT | Severe Thunderstorm Warning | BYZ | 60 min |
| Aug 7, 6:43 PM MDT | Severe Thunderstorm Warning | BYZ | 62 min |
| Aug 7, 7:32 PM MDT | Severe Thunderstorm Warning | BYZ | 20 min |
| Aug 7, 7:55 PM MDT | Special Weather Statement | BYZ | 50 min |
| Aug 14, 5:10 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Aug 14, 7:27 PM MDT | Severe Thunderstorm Warning | BYZ | 52 min |
| Aug 14, 7:51 PM MDT | Severe Thunderstorm Warning | BYZ | 54 min |
| Aug 14, 8:00 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 14, 10:22 PM MDT | Special Weather Statement | BYZ | 53 min |
| Aug 14, 10:47 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Sep 4, 3:37 PM MDT | Fire Weather Watch | BYZ | 37 hr |
| Sep 6, 4:46 AM MDT | Red Flag Warning | BYZ | 16 hr |
| Sep 7, 6:28 PM MDT | Special Weather Statement | BYZ | 62 min |
| Sep 10, 4:12 AM MDT | Red Flag Warning | BYZ | 17 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 24, 2:57 PM MDT | Fire Weather Watch | BYZ | 24 hr |
| Sep 25, 2:56 PM MDT | Red Flag Warning | BYZ | 31 hr |
| Sep 28, 2:18 PM MDT | Red Flag Warning | BYZ | 31 hr |
| Oct 2, 2:48 PM MDT | Winter Storm Watch | BYZ | 49 hr |
| Oct 4, 3:31 PM MDT | Winter Weather Advisory | BYZ | 35 hr |
| Oct 4, 6:31 PM MDT | Mesoscale Discussion | SPC | 6 hr |
| Oct 5, 1:44 AM MDT | Mesoscale Discussion | SPC | 5 hr |
| Dec 8, 2:24 PM MST | Wind Chill Advisory | BYZ | 21 hr |
| Dec 9, 2:53 PM MST | Wind Chill Advisory | BYZ | 12 hr |
| Dec 11, 2:58 PM MST | Winter Storm Watch | BYZ | 24 hr |
| Dec 12, 2:57 PM MST | Winter Weather Advisory | BYZ | 50 hr |
| Dec 20, 7:39 AM MST | Dense Fog Advisory | BYZ | 3 hr |
| Dec 20, 11:16 PM MST | Winter Weather Advisory | BYZ | 16 hr |
| Dec 21, 5:10 PM MST | Dense Fog Advisory | BYZ | 24 hr |
| Dec 22, 4:17 AM MST | Winter Weather Advisory | BYZ | 41 hr |
| Dec 25, 3:59 AM MST | Winter Weather Advisory | BYZ | 31 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.