Alert archive / Montana / Ravalli County
Weather alerts in Ravalli County, Montana, 2020
113 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 113
- Warnings
- 12
- Watches
- 13
- Advisories
- 62
- Busiest month
- August14 alerts
- Busiest day
- May 19, 20206 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, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 0 | 100% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 7 | 5 | 29% | 29 | 69% | 12 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 3, 8:21 AM MST | Wind Advisory | MSO | 35 hr |
| Jan 5, 12:57 PM MST | Winter Weather Advisory | MSO | 4 days |
| Jan 6, 11:06 AM MST | Winter Weather Advisory | MSO | 17 hr |
| Jan 10, 4:02 AM MST | Winter Weather Advisory | MSO | 3 days |
| Jan 13, 2:20 PM MST | Winter Weather Advisory | MSO | 37 hr |
| Jan 14, 3:55 PM MST | Special Weather Statement | MSO | 65 min |
| Jan 16, 1:39 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Jan 25, 3:31 AM MST | Winter Weather Advisory | MSO | 7 hr |
| Jan 26, 3:20 AM MST | Freezing Fog Advisory | MSO | 8 hr |
| Jan 27, 3:12 AM MST | Dense Fog Advisory | MSO | 7 hr |
| Jan 27, 2:22 PM MST | Winter Weather Advisory | MSO | 24 hr |
| Jan 31, 1:20 PM MST | Wind Advisory | MSO | 28 hr |
| Feb 1, 9:01 AM MST | High Wind Warning | MSO | 11 hr |
| Feb 1, 2:04 PM MST | Winter Weather Advisory | MSO | 34 hr |
| Feb 3, 2:11 PM MST | Winter Storm Watch | MSO | 24 hr |
| Feb 4, 1:48 PM MST | Winter Weather Advisory | MSO | 71 hr |
| Feb 5, 1:21 PM MST | Winter Weather Advisory | MSO | 43 hr |
| Feb 7, 2:00 PM MST | Winter Weather Advisory | MSO | 33 hr |
| Feb 10, 4:23 AM MST | Winter Weather Advisory | MSO | 5 hr |
| Feb 12, 3:14 AM MST | Winter Weather Advisory | MSO | 8 hr |
| Feb 13, 3:45 AM MST | Winter Weather Advisory | MSO | 4 days |
| Feb 22, 2:43 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Feb 23, 5:26 PM MST | Special Weather Statement | MSO | 49 min |
| Feb 23, 5:51 PM MST | Snow Squall Warning | MSO | 54 min |
| Mar 3, 2:23 PM MST | High Wind Watch | MSO | 17 hr |
| Mar 3, 2:23 PM MST | Wind Advisory | MSO | 27 hr |
| Mar 3, 2:26 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Mar 12, 2:24 PM MDT | Winter Weather Advisory | MSO | 49 hr |
| Mar 13, 3:26 AM MDT | Wind Advisory | MSO | 23 hr |
| Mar 14, 8:05 AM MDT | Special Weather Statement | MSO | 55 min |
| Mar 29, 2:27 PM MDT | Wind Advisory | MSO | 31 hr |
| Mar 29, 2:29 PM MDT | Winter Weather Advisory | MSO | 70 hr |
| Apr 1, 2:43 PM MDT | Winter Weather Advisory | MSO | 18 hr |
| Apr 10, 2:45 PM MDT | Winter Weather Advisory | MSO | 31 hr |
| Apr 14, 2:59 AM MDT | Winter Weather Advisory | MSO | 33 hr |
| Apr 15, 6:26 AM MDT | Special Weather Statement | MSO | 49 min |
| Apr 15, 7:16 AM MDT | Special Weather Statement | MSO | 74 min |
| Apr 15, 8:47 AM MDT | Special Weather Statement | MSO | 73 min |
| May 5, 2:05 PM MDT | Wind Advisory | MSO | 31 hr |
| May 15, 8:37 AM MDT | Winter Weather Advisory | MSO | 3 hr |
| May 19, 11:02 AM MDT | Flood Watch | MSO | 24 hr |
| May 19, 12:03 PM MDT | River Flood Watch | MSO | 3 days |
| May 19, 12:03 PM MDT | River Flood Watch | MSO | 67 hr |
| May 19, 1:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| May 19, 1:57 PM MDT | Special Weather Statement | TFX | 18 min |
| May 19, 2:34 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 20, 11:15 AM MDT | Areal Flood Advisory | MSO | 25 hr |
| May 20, 11:55 AM MDT | River Flood Advisory | MSO | 23 hr |
| May 20, 11:55 AM MDT | River Flood Advisory | MSO | 23 hr |
| May 31, 6:33 AM MDT | Special Weather Statement | MSO | 57 min |
| May 31, 6:56 AM MDT | Special Weather Statement | MSO | 34 min |
| Jun 5, 1:46 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jun 6, 1:51 PM MDT | Winter Weather Advisory | MSO | 46 hr |
| Jun 12, 2:11 PM MDT | Wind Advisory | MSO | 28 hr |
| Jun 13, 2:21 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 15, 10:49 AM MDT | Winter Storm Watch | MSO | 24 hr |
| Jun 16, 10:40 AM MDT | Winter Storm Warning | MSO | 22 hr |
| Jun 24, 2:29 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 1:50 PM MDT | Flood Watch | MSO | 3 days |
| Jun 28, 2:22 PM MDT | Winter Weather Advisory | MSO | 22 hr |
| Jul 3, 6:56 PM MDT | Special Weather Statement | MSO | 34 min |
| Jul 4, 1:53 PM MDT | Special Weather Statement | MSO | 52 min |
| Jul 23, 11:39 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 2:51 PM MDT | Heat Advisory | MSO | 4 days |
| Jul 31, 5:36 PM MDT | Special Weather Statement | MSO | 39 min |
| Aug 6, 1:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 14, 11:30 AM MDT | Heat Advisory | MSO | 4 days |
| Aug 14, 11:56 AM MDT | Heat Advisory | MSO | 4 days |
| Aug 17, 12:28 PM MDT | Fire Weather Watch | MSO | 20 hr |
| Aug 19, 2:45 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 19, 3:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 25, 3:49 PM MDT | Special Weather Statement | MSO | 41 min |
| Aug 26, 2:44 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Aug 26, 3:01 PM MDT | Special Weather Statement | MSO | 29 min |
| Aug 26, 5:30 PM MDT | Special Weather Statement | MSO | 30 min |
| Aug 26, 5:53 PM MDT | Severe Thunderstorm Warning | MSO | 22 min |
| Aug 26, 6:49 PM MDT | Special Weather Statement | MSO | 26 min |
| Aug 27, 2:47 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 28, 2:19 PM MDT | Red Flag Warning | MSO | 34 hr |
| Sep 4, 12:29 PM MDT | Red Flag Warning | MSO | 34 hr |
| Sep 6, 1:07 PM MDT | Winter Weather Advisory | MSO | 35 hr |
| Sep 6, 1:09 PM MDT | High Wind Warning | MSO | 35 hr |
| Sep 6, 1:09 PM MDT | Wind Advisory | MSO | 30 hr |
| Sep 7, 2:12 PM MDT | Freeze Warning | MSO | 19 hr |
| Oct 10, 2:02 PM MDT | Winter Weather Advisory | MSO | 20 hr |
| Oct 11, 2:19 PM MDT | Winter Weather Advisory | MSO | 22 hr |
| Oct 12, 2:14 AM MDT | Wind Advisory | MSO | 16 hr |
| Oct 12, 2:18 PM MDT | High Wind Watch | MSO | 24 hr |
| Oct 13, 3:05 AM MDT | High Wind Warning | MSO | 24 hr |
| Oct 13, 3:05 AM MDT | Wind Advisory | MSO | 24 hr |
| Oct 16, 10:55 AM MDT | Wind Advisory | MSO | 10 hr |
| Oct 20, 2:45 PM MDT | Winter Weather Advisory | MSO | 36 hr |
| Oct 22, 2:56 AM MDT | Winter Storm Watch | MSO | 11 hr |
| Oct 22, 1:55 PM MDT | Winter Storm Warning | MSO | 52 hr |
| Oct 23, 4:36 PM MDT | Mesoscale Discussion | SPC | 4 hr |
| Oct 26, 12:02 PM MDT | Air Stagnation Advisory | MSO | 4 days |
| Oct 29, 4:09 AM MDT | Dense Fog Advisory | MSO | 7 hr |
| Oct 30, 11:39 AM MDT | Wind Advisory | MSO | 8 hr |
| Nov 5, 1:39 PM MST | Winter Storm Watch | MSO | 46 hr |
| Nov 7, 3:36 AM MST | Winter Storm Warning | MSO | 35 hr |
| Nov 7, 3:36 AM MST | Winter Weather Advisory | MSO | 49 hr |
| Nov 10, 12:58 PM MST | Winter Weather Advisory | MSO | 28 hr |
| Nov 10, 9:48 PM MST | Winter Storm Warning | MSO | 7 hr |
| Nov 12, 2:40 PM MST | Winter Weather Advisory | MSO | 47 hr |
| Nov 18, 1:54 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Nov 24, 1:45 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Nov 30, 1:11 PM MST | Winter Weather Advisory | MSO | 19 hr |
| Nov 30, 2:27 PM MST | Air Stagnation Advisory | MSO | 8 days |
| Dec 8, 1:54 PM MST | Winter Weather Advisory | MSO | 33 hr |
| Dec 11, 11:22 AM MST | Winter Weather Advisory | MSO | 21 hr |
| Dec 13, 1:44 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Dec 19, 2:24 PM MST | Winter Weather Advisory | MSO | 43 hr |
| Dec 21, 2:50 PM MST | Winter Weather Advisory | MSO | 32 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 | 1 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 10 |
| Special Weather Statement | 16 |
| Flooding | |
| Flood Watch | 2 |
| River Flood Watch | 2 |
| Areal Flood Advisory | 1 |
| River Flood Advisory | 2 |
| Winter | |
| Snow Squall Warning | 1 |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 39 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 1 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 2 |
| Wind Advisory | 12 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Air Stagnation Advisory | 2 |
| Dense Fog Advisory | 2 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.