Alert archive / Montana / Ravalli County
Weather alerts in Ravalli County, Montana, 2018
113 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 113
- Warnings
- 16
- Watches
- 13
- Advisories
- 58
- Busiest month
- May26 alerts
- Busiest day
- May 31, 20187 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, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 2 | 0% | 3 | 67% | 33 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 11 | 9 | 18% | 17 | 76% | 18 min |
| NWS Missoula, MT: flash flood warnings | 1 | 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 3, 12:14 PM MST | Winter Weather Advisory | MSO | 4 hr |
| Jan 5, 12:58 PM MST | Winter Weather Advisory | MSO | 22 hr |
| Jan 9, 2:25 PM MST | Winter Storm Watch | MSO | 24 hr |
| Jan 10, 2:16 PM MST | Winter Weather Advisory | MSO | 42 hr |
| Jan 16, 7:02 AM MST | Dense Fog Advisory | MSO | 3 hr |
| Jan 17, 6:20 AM MST | Dense Fog Advisory | MSO | 4 hr |
| Jan 17, 1:59 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Jan 17, 1:59 PM MST | Winter Weather Advisory | MSO | 45 hr |
| Jan 23, 3:31 AM MST | Winter Weather Advisory | MSO | 35 hr |
| Jan 24, 2:06 PM MST | Winter Weather Advisory | MSO | 21 hr |
| Jan 25, 8:58 PM MST | Winter Weather Advisory | MSO | 13 hr |
| Jan 29, 6:08 AM MST | Freezing Fog Advisory | MSO | 5 hr |
| Jan 30, 1:05 AM MST | Wind Advisory | MSO | 16 hr |
| Feb 1, 2:04 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Feb 7, 2:27 PM MST | Winter Weather Advisory | MSO | 53 hr |
| Feb 8, 11:39 PM MST | Winter Storm Warning | MSO | 11 hr |
| Feb 13, 2:18 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Feb 15, 3:18 PM MST | Winter Storm Watch | MSO | 44 hr |
| Feb 15, 3:18 PM MST | Winter Weather Advisory | MSO | 50 hr |
| Feb 15, 3:18 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Feb 16, 2:53 PM MST | Winter Storm Warning | MSO | 57 hr |
| Feb 18, 2:26 PM MST | Wind Chill Advisory | MSO | 23 hr |
| Feb 24, 6:50 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Mar 2, 8:08 AM MST | Winter Weather Advisory | MSO | 14 hr |
| Mar 3, 2:05 PM MST | Winter Weather Advisory | MSO | 24 hr |
| Mar 5, 3:03 AM MST | Winter Weather Advisory | MSO | 8 hr |
| Mar 8, 7:26 AM MST | Winter Weather Advisory | MSO | 25 hr |
| Mar 14, 12:54 PM MDT | Winter Weather Advisory | MSO | 28 hr |
| Mar 16, 3:17 AM MDT | Winter Weather Advisory | MSO | 57 hr |
| Mar 19, 7:20 AM MDT | Dense Fog Advisory | MSO | 4 hr |
| Apr 1, 3:49 AM MDT | Winter Weather Advisory | MSO | 50 hr |
| Apr 4, 2:39 PM MDT | Winter Weather Advisory | MSO | 45 hr |
| Apr 11, 12:48 PM MDT | Winter Weather Advisory | MSO | 29 hr |
| Apr 29, 2:30 PM MDT | Winter Weather Advisory | MSO | 20 hr |
| May 6, 11:24 AM MDT | Flood Watch | MSO | 24 hr |
| May 6, 2:50 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 6, 4:53 PM MDT | Special Weather Statement | MSO | 67 min |
| May 7, 10:51 AM MDT | Areal Flood Warning | MSO | 4 days |
| May 7, 10:56 AM MDT | Areal Flood Warning | MSO | 4 days |
| May 7, 11:19 AM MDT | Areal Flood Warning | MSO | 6 days |
| May 10, 4:37 AM MDT | Dense Fog Advisory | MSO | 5 hr |
| May 10, 11:18 AM MDT | Areal Flood Advisory | MSO | 46 hr |
| May 11, 1:35 PM MDT | Areal Flood Advisory | MSO | 20 hr |
| May 14, 1:21 PM MDT | Flood Watch | MSO | 71 hr |
| May 16, 12:48 PM MDT | Areal Flood Warning | MSO | 4 days |
| May 16, 2:16 PM MDT | Special Weather Statement | MSO | 44 min |
| May 21, 11:59 AM MDT | Flood Watch | MSO | 45 hr |
| May 22, 1:57 PM MDT | Areal Flood Warning | MSO | 11 days |
| May 22, 3:30 PM MDT | Special Weather Statement | MSO | 30 min |
| May 22, 3:51 PM MDT | Special Weather Statement | MSO | 24 min |
| May 23, 9:34 AM MDT | Flood Watch | MSO | 4 days |
| May 23, 4:29 PM MDT | Special Weather Statement | MSO | 31 min |
| May 25, 9:31 AM MDT | Areal Flood Warning | MSO | 49 hr |
| May 30, 10:38 PM MDT | Special Weather Statement | MSO | 22 min |
| May 30, 10:44 PM MDT | Special Weather Statement | TFX | 31 min |
| May 31, 11:12 AM MDT | Special Weather Statement | MSO | 33 min |
| May 31, 12:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| May 31, 12:34 PM MDT | Special Weather Statement | MSO | 41 min |
| May 31, 12:52 PM MDT | Severe Thunderstorm Warning | MSO | 38 min |
| May 31, 1:24 PM MDT | Severe Thunderstorm Warning | MSO | 36 min |
| Jun 4, 1:47 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jun 7, 1:20 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 9, 11:54 AM MDT | Winter Weather Advisory | MSO | 48 hr |
| Jun 9, 1:06 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 9, 1:43 PM MDT | Special Weather Statement | MSO | 47 min |
| Jun 9, 2:47 PM MDT | Special Weather Statement | TFX | 13 min |
| Jun 9, 4:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 11, 1:15 PM MDT | Frost Advisory | MSO | 19 hr |
| Aug 1, 12:04 PM MDT | Red Flag Warning | MSO | 34 hr |
| Aug 7, 2:46 PM MDT | Heat Advisory | MSO | 3 days |
| Aug 8, 2:13 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 9, 2:23 PM MDT | Red Flag Warning | MSO | 3 days |
| Aug 15, 2:14 PM MDT | Fire Weather Watch | MSO | 32 hr |
| Aug 15, 2:14 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 16, 2:26 PM MDT | Red Flag Warning | MSO | 37 hr |
| Aug 17, 1:41 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 17, 2:41 PM MDT | Special Weather Statement | MSO | 34 min |
| Aug 17, 3:18 PM MDT | Special Weather Statement | MSO | 27 min |
| Aug 20, 2:23 PM MDT | Special Weather Statement | MSO | 37 min |
| Aug 20, 4:28 PM MDT | Special Weather Statement | MSO | 32 min |
| Aug 22, 5:31 PM MDT | Special Weather Statement | MSO | 44 min |
| Sep 5, 7:04 PM MDT | Special Weather Statement | MSO | 41 min |
| Sep 5, 7:51 PM MDT | Special Weather Statement | MSO | 39 min |
| Sep 28, 10:11 AM MDT | Wind Advisory | MSO | 38 hr |
| Oct 9, 3:48 AM MDT | Winter Weather Advisory | MSO | 29 hr |
| Oct 9, 3:50 AM MDT | Wind Advisory | MSO | 11 hr |
| Oct 13, 1:31 AM MDT | Winter Weather Advisory | MSO | 10 hr |
| Nov 2, 3:38 AM MDT | Wind Advisory | MSO | 17 hr |
| Nov 5, 2:53 AM MST | Winter Weather Advisory | MSO | 33 hr |
| Nov 6, 2:18 PM MST | Winter Weather Advisory | MSO | 42 hr |
| Nov 9, 6:06 PM MST | Winter Weather Advisory | MSO | 16 hr |
| Nov 11, 1:49 PM MST | Winter Weather Advisory | MSO | 7 hr |
| Nov 15, 1:38 PM MST | Winter Weather Advisory | MSO | 37 hr |
| Nov 21, 2:47 PM MST | Winter Storm Watch | MSO | 23 hr |
| Nov 21, 2:47 PM MST | Winter Weather Advisory | MSO | 69 hr |
| Nov 22, 1:53 PM MST | Winter Storm Warning | MSO | 46 hr |
| Nov 26, 3:15 AM MST | Dense Fog Advisory | MSO | 6 hr |
| Nov 27, 6:55 AM MST | Winter Weather Advisory | MSO | 3 hr |
| Nov 28, 9:41 PM MST | Dense Fog Advisory | MSO | 10 hr |
| Nov 29, 11:07 PM MST | Freezing Fog Advisory | MSO | 8 hr |
| Dec 10, 3:20 AM MST | Winter Storm Watch | MSO | 11 hr |
| Dec 10, 2:42 PM MST | Winter Storm Warning | MSO | 42 hr |
| Dec 10, 2:42 PM MST | Winter Weather Advisory | MSO | 50 hr |
| Dec 17, 3:39 AM MST | Winter Storm Watch | MSO | 11 hr |
| Dec 17, 2:37 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Dec 20, 2:39 PM MST | Winter Weather Advisory | MSO | 20 hr |
| Dec 22, 3:34 AM MST | Winter Weather Advisory | MSO | 64 hr |
| Dec 26, 2:25 PM MST | Winter Weather Advisory | MSO | 24 hr |
| Dec 27, 2:39 PM MST | Winter Storm Watch | MSO | 48 hr |
| Dec 28, 2:40 PM MST | Winter Weather Advisory | MSO | 24 hr |
| Dec 29, 2:11 PM MST | Winter Storm Warning | MSO | 30 hr |
| Dec 29, 2:11 PM MST | Winter Weather Advisory | MSO | 39 hr |
| Dec 30, 5:20 PM MST | Special Weather Statement | MSO | 40 min |
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 | 2 |
| Mesoscale Discussion | 7 |
| Special Weather Statement | 19 |
| Flooding | |
| Areal Flood Warning | 6 |
| Flood Watch | 4 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 6 |
| Winter Weather Advisory | 41 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Frost Advisory | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
| Freezing Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.