Alert archive / Montana / Ravalli County
Weather alerts in Ravalli County, Montana, 2009
92 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Ravalli County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 92
- Warnings
- 23
- Watches
- 16
- Advisories
- 44
- Busiest month
- January17 alerts
- Busiest day
- May 19, 20095 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Ravalli County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 3 | 0% | 4 | 75% | 5 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 Missoula, MT: severe thunderstorm warnings | 30 | 13 | 57% | 35 | 80% | 22 min |
| NWS Missoula, MT: flash flood warnings | 3 | 1 | 67% | 8 | 13% | 48 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 1, 4:22 AM MST | Winter Storm Warning | MSO | 37 hr |
| Jan 1, 4:22 AM MST | Winter Weather Advisory | MSO | 9 hr |
| Jan 1, 12:57 PM MST | Winter Weather Advisory | MSO | 28 hr |
| Jan 2, 8:57 AM MST | Wind Advisory | MSO | 5 hr |
| Jan 3, 3:03 PM MST | Winter Storm Watch | MSO | 13 hr |
| Jan 4, 4:10 AM MST | Winter Storm Warning | MSO | 41 hr |
| Jan 5, 2:56 PM MST | Winter Storm Watch | MSO | 13 hr |
| Jan 5, 3:57 PM MST | Flood Watch | MSO | 44 hr |
| Jan 6, 4:15 AM MST | Winter Storm Warning | MSO | 30 hr |
| Jan 6, 12:21 PM MST | Freezing Rain Advisory | MSO | 19 hr |
| Jan 8, 8:39 AM MST | Winter Weather Advisory | MSO | 13 hr |
| Jan 16, 7:27 AM MST | Dense Fog Advisory | MSO | 49 hr |
| Jan 17, 10:33 AM MST | Dense Fog Advisory | MSO | 26 hr |
| Jan 24, 3:25 AM MST | Wind Chill Advisory | MSO | 35 hr |
| Jan 24, 3:25 AM MST | Winter Weather Advisory | MSO | 32 hr |
| Jan 26, 2:41 PM MST | Winter Weather Advisory | MSO | 48 hr |
| Jan 31, 8:45 AM MST | Wind Advisory | MSO | 3 hr |
| Feb 3, 2:48 PM MST | Dense Fog Advisory | MSO | 24 hr |
| Feb 23, 2:36 PM MST | Winter Weather Advisory | MSO | 27 hr |
| Feb 24, 5:53 PM MST | Winter Storm Warning | MSO | 11 hr |
| Feb 25, 4:32 AM MST | Winter Storm Warning | MSO | 42 hr |
| Feb 25, 2:45 PM MST | Winter Storm Watch | MSO | 13 hr |
| Mar 3, 2:08 PM MST | Winter Storm Watch | MSO | 43 hr |
| Mar 4, 2:29 PM MST | Winter Storm Warning | MSO | 42 hr |
| Mar 4, 2:29 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Mar 7, 4:24 AM MST | Winter Weather Advisory | MSO | 37 hr |
| Mar 13, 2:44 PM MDT | Winter Weather Advisory | MSO | 3 days |
| Mar 14, 9:07 PM MDT | Winter Storm Warning | MSO | 47 hr |
| Mar 16, 5:44 PM MDT | Winter Weather Advisory | MSO | 10 hr |
| Mar 17, 7:47 AM MDT | Winter Weather Advisory | MSO | 4 hr |
| Mar 23, 2:10 PM MDT | Winter Storm Watch | MSO | 38 hr |
| Mar 24, 2:12 PM MDT | Winter Storm Warning | MSO | 33 hr |
| Mar 28, 4:10 AM MDT | Winter Storm Warning | MSO | 44 hr |
| Mar 30, 2:51 PM MDT | Winter Weather Advisory | MSO | 39 hr |
| Apr 1, 9:58 PM MDT | Winter Weather Advisory | MSO | 32 hr |
| Apr 27, 2:35 PM MDT | Winter Weather Advisory | MSO | 39 hr |
| May 11, 2:41 PM MDT | Winter Weather Advisory | MSO | 30 hr |
| May 18, 11:32 PM MDT | River Flood Watch | MSO | 13 hr |
| May 19, 4:10 AM MDT | Wind Advisory | MSO | 16 hr |
| May 19, 9:40 AM MDT | River Flood Watch | MSO | 3 hr |
| May 19, 12:23 PM MDT | River Flood Warning | MSO | 44 hr |
| May 19, 12:23 PM MDT | River Flood Warning | MSO | 34 hr |
| May 23, 2:01 PM MDT | River Flood Watch | MSO | 26 hr |
| May 24, 3:45 PM MDT | River Flood Warning | MSO | 42 hr |
| May 24, 4:07 PM MDT | River Flood Watch | MSO | 37 hr |
| May 29, 10:17 AM MDT | River Flood Watch | MSO | 46 hr |
| May 29, 10:17 AM MDT | River Flood Watch | MSO | 46 hr |
| May 31, 8:10 AM MDT | River Flood Warning | MSO | 33 hr |
| May 31, 3:36 PM MDT | River Flood Warning | MSO | 26 hr |
| Jun 5, 4:21 PM MDT | Flash Flood Warning | MSO | 114 min |
| Jun 6, 8:46 AM MDT | Special Weather Statement | MSO | 44 min |
| Jun 15, 9:52 AM MDT | Areal Flood Advisory | MSO | 3 hr |
| Jul 6, 12:56 PM MDT | Severe Thunderstorm Warning | MSO | 49 min |
| Jul 6, 1:45 PM MDT | Severe Thunderstorm Warning | MSO | 45 min |
| Jul 13, 6:36 AM MDT | Special Weather Statement | MSO | 39 min |
| Jul 24, 1:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 24, 2:49 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 25, 6:52 PM MDT | Special Weather Statement | MSO | 38 min |
| Aug 5, 4:17 PM MDT | Special Weather Statement | MSO | 58 min |
| Aug 6, 12:04 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Aug 6, 12:34 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 13, 2:48 PM MDT | Special Weather Statement | MSO | 42 min |
| Aug 13, 2:54 PM MDT | Severe Thunderstorm Warning | MSO | 21 min |
| Aug 21, 7:00 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Aug 30, 6:12 PM MDT | Special Weather Statement | MSO | 48 min |
| Sep 20, 2:39 PM MDT | Frost Advisory | MSO | 18 hr |
| Sep 24, 2:45 PM MDT | Fire Weather Watch | MSO | 23 hr |
| Sep 25, 1:47 PM MDT | Red Flag Warning | MSO | 33 hr |
| Sep 29, 5:44 AM MDT | Wind Advisory | MSO | 3 hr |
| Sep 29, 2:37 PM MDT | Winter Weather Advisory | MSO | 13 hr |
| Oct 3, 2:05 PM MDT | Wind Advisory | MSO | 20 hr |
| Oct 7, 1:56 PM MDT | Winter Weather Advisory | MSO | 46 hr |
| Oct 10, 4:32 AM MDT | Wind Chill Advisory | MSO | 25 hr |
| Oct 25, 3:54 AM MDT | Winter Storm Watch | MSO | 24 hr |
| Oct 26, 3:59 AM MDT | Winter Storm Warning | MSO | 32 hr |
| Nov 11, 3:23 AM MST | Winter Weather Advisory | MSO | 32 hr |
| Nov 11, 6:46 AM MST | Winter Weather Advisory | MSO | 6 hr |
| Nov 21, 4:25 AM MST | Winter Weather Advisory | MSO | 49 hr |
| Dec 4, 2:05 PM MST | Wind Chill Warning | MSO | 69 hr |
| Dec 4, 2:05 PM MST | Wind Chill Advisory | MSO | 69 hr |
| Dec 7, 2:06 PM MST | Wind Chill Warning | MSO | 8 hr |
| Dec 11, 1:30 PM MST | Winter Storm Warning | MSO | 3 days |
| Dec 12, 4:06 AM MST | Winter Weather Advisory | MSO | 34 hr |
| Dec 15, 4:56 PM MST | Winter Weather Advisory | MSO | 18 hr |
| Dec 16, 2:00 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Dec 16, 6:34 PM MST | Freezing Rain Advisory | MSO | 16 hr |
| Dec 16, 9:38 PM MST | Dense Fog Advisory | MSO | 13 hr |
| Dec 17, 2:10 PM MST | Dense Fog Advisory | MSO | 21 hr |
| Dec 19, 6:21 AM MST | Dense Fog Advisory | MSO | 4 hr |
| Dec 20, 5:19 AM MST | Freezing Rain Advisory | MSO | 4 hr |
| Dec 20, 4:46 PM MST | Dense Fog Advisory | MSO | 18 hr |
| Dec 30, 2:47 PM MST | Winter Weather Advisory | MSO | 41 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 | 3 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 3 |
| Special Weather Statement | 6 |
| Flooding | |
| Flash Flood Warning | 1 |
| River Flood Warning | 5 |
| Flood Watch | 1 |
| River Flood Watch | 6 |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 11 |
| Winter Storm Watch | 6 |
| Freezing Rain Advisory | 3 |
| Winter Weather Advisory | 24 |
| Cold | |
| Wind Chill Warning | 2 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
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.