Alert archive / Montana / Fallon County
Weather alerts in Fallon County, Montana, 2019
115 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Fallon County and its neighbors
Each county as a circle sized by its count in 2019. Tap one for its archive.
- Alerts
- 115
- Warnings
- 14
- Watches
- 20
- Advisories
- 25
- Busiest month
- July35 alerts
- Busiest day
- July 9, 20199 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Fallon County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 3 | 63% | 3 | 67% | 18 min |
| Flash flood warnings | 1 | 1 | 0% | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Billings, MT: tornado warnings | 3 | 0 | 100% | 4 | 0% | |
| NWS Billings, MT: severe thunderstorm warnings | 185 | 83 | 55% | 233 | 73% | 29 min |
| NWS Billings, MT: flash flood warnings | 12 | 4 | 67% | 12 | 67% | 171 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 12, 2:02 AM MST | Special Weather Statement | BYZ | 4 hr |
| Jan 12, 3:18 AM MST | Dense Fog Advisory | BYZ | 8 hr |
| Jan 17, 12:24 AM MST | Dense Fog Advisory | BYZ | 6 hr |
| Jan 24, 3:25 AM MST | Wind Chill Advisory | BYZ | 9 hr |
| Jan 25, 3:24 PM MST | High Wind Warning | BYZ | 59 hr |
| Jan 26, 3:20 AM MST | High Wind Watch | BYZ | 23 hr |
| Jan 28, 3:48 AM MST | Wind Chill Advisory | BYZ | 46 hr |
| Jan 28, 2:07 PM MST | Special Weather Statement | BYZ | 3 hr |
| Feb 1, 4:08 AM MST | Winter Storm Watch | BYZ | 24 hr |
| Feb 2, 3:45 AM MST | Winter Weather Advisory | BYZ | 41 hr |
| Feb 3, 11:46 AM MST | Wind Chill Advisory | BYZ | 5 days |
| Feb 8, 12:07 PM MST | Wind Chill Advisory | BYZ | 48 hr |
| Feb 10, 11:52 AM MST | Wind Chill Advisory | BYZ | 21 hr |
| Feb 13, 2:20 PM MST | Wind Chill Advisory | BYZ | 20 hr |
| Feb 14, 2:40 PM MST | Winter Weather Advisory | BYZ | 25 hr |
| Feb 15, 3:32 PM MST | Winter Storm Watch | BYZ | 12 hr |
| Feb 15, 8:53 PM MST | Winter Storm Warning | BYZ | 38 hr |
| Feb 23, 3:00 AM MST | Winter Weather Advisory | BYZ | 6 days |
| Feb 23, 3:12 PM MST | Wind Chill Advisory | BYZ | 20 hr |
| Feb 24, 2:57 AM MST | Winter Weather Advisory | BYZ | 60 hr |
| Feb 26, 2:30 PM MST | Wind Chill Advisory | BYZ | 20 hr |
| Mar 1, 1:14 PM MST | Wind Chill Advisory | BYZ | 70 hr |
| Mar 2, 3:10 PM MST | Wind Chill Warning | BYZ | 44 hr |
| Mar 4, 2:59 PM MST | Wind Chill Advisory | BYZ | 19 hr |
| Mar 7, 3:28 AM MST | Winter Storm Watch | BYZ | 23 hr |
| Mar 8, 2:55 AM MST | Winter Weather Advisory | BYZ | 31 hr |
| Mar 12, 2:05 AM MDT | Winter Storm Watch | BYZ | 14 hr |
| Mar 12, 3:44 PM MDT | Winter Weather Advisory | BYZ | 35 hr |
| Mar 19, 8:13 AM MDT | Special Weather Statement | BYZ | 92 min |
| Mar 23, 9:26 AM MDT | Special Weather Statement | BYZ | 2 hr |
| Mar 24, 2:51 PM MDT | Dense Fog Advisory | BYZ | 18 hr |
| Mar 26, 1:42 AM MDT | Special Weather Statement | BYZ | 4 hr |
| Apr 6, 6:42 AM MDT | Special Weather Statement | BYZ | 108 min |
| May 18, 10:08 AM MDT | Special Weather Statement | BYZ | 112 min |
| May 20, 2:43 PM MDT | Flood Watch | BYZ | 48 hr |
| May 28, 5:34 AM MDT | Special Weather Statement | BYZ | 3 hr |
| Jun 3, 3:40 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jun 3, 4:51 PM MDT | Special Weather Statement | BYZ | 24 min |
| Jun 7, 3:45 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 7, 5:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jun 14, 2:44 AM MDT | Special Weather Statement | BYZ | 46 min |
| Jun 14, 2:05 PM MDT | Special Weather Statement | GGW | 40 min |
| Jun 18, 2:16 PM MDT | Special Weather Statement | BYZ | 44 min |
| Jun 19, 8:28 PM MDT | Special Weather Statement | BYZ | 62 min |
| Jun 20, 4:38 PM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 20, 8:43 PM MDT | Mesoscale Discussion | SPC | 32 min |
| Jun 26, 2:16 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 26, 9:47 PM MDT | Special Weather Statement | BYZ | 58 min |
| Jun 30, 2:18 AM MDT | Special Weather Statement | BYZ | 57 min |
| Jul 1, 6:18 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 2, 1:33 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 2, 4:20 PM MDT | Severe Thunderstorm Warning | BYZ | 40 min |
| Jul 5, 9:27 AM MDT | Flash Flood Watch | BYZ | 14 hr |
| Jul 7, 2:58 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 7, 8:43 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 3:21 AM MDT | Flash Flood Watch | BYZ | 24 hr |
| Jul 8, 12:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 1:25 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 8, 5:24 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 8:02 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 8, 8:14 PM MDT | Severe Thunderstorm Warning | BYZ | 61 min |
| Jul 8, 8:44 PM MDT | Flash Flood Warning | BYZ | 6 hr |
| Jul 8, 8:59 PM MDT | Special Weather Statement | BYZ | 16 min |
| Jul 8, 9:12 PM MDT | Special Weather Statement | BYZ | 48 min |
| Jul 8, 9:15 PM MDT | Severe Thunderstorm Warning | BYZ | 60 min |
| Jul 8, 10:10 PM MDT | Special Weather Statement | BYZ | 50 min |
| Jul 8, 11:09 PM MDT | Special Weather Statement | BYZ | 51 min |
| Jul 9, 12:50 AM MDT | Special Weather Statement | BYZ | 55 min |
| Jul 13, 10:36 PM MDT | Special Weather Statement | BYZ | 54 min |
| Jul 14, 6:15 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 9:33 PM MDT | Severe Thunderstorm Warning | BYZ | 57 min |
| Jul 14, 10:27 PM MDT | Severe Thunderstorm Warning | BYZ | 43 min |
| Jul 16, 12:56 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jul 16, 1:28 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 17, 2:41 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 24, 3:51 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 30, 4:52 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jul 30, 5:08 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 30, 7:29 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jul 30, 7:34 PM MDT | Severe Thunderstorm Warning | BYZ | 56 min |
| Jul 30, 8:23 PM MDT | Severe Thunderstorm Warning | BYZ | 33 min |
| Jul 30, 9:06 PM MDT | Areal Flood Advisory | BYZ | 114 min |
| Jul 30, 11:24 PM MDT | Special Weather Statement | BYZ | 36 min |
| Jul 31, 2:51 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 2:22 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 4:22 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Aug 4, 6:24 PM MDT | Special Weather Statement | BYZ | 51 min |
| Aug 4, 7:12 PM MDT | Special Weather Statement | BYZ | 48 min |
| Aug 5, 12:10 AM MDT | Special Weather Statement | BYZ | 50 min |
| Aug 10, 4:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 12:15 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Aug 11, 1:59 PM MDT | Tornado Watch | SPC | 10 hr |
| Aug 11, 5:54 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Aug 11, 8:45 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Aug 11, 10:45 PM MDT | Special Weather Statement | BYZ | 45 min |
| Aug 18, 7:45 AM MDT | Special Weather Statement | BYZ | 75 min |
| Aug 22, 5:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 25, 8:51 PM MDT | Special Weather Statement | BYZ | 69 min |
| Sep 1, 4:14 PM MDT | Severe Thunderstorm Warning | BYZ | 61 min |
| Sep 1, 4:59 PM MDT | Special Weather Statement | BYZ | 61 min |
| Sep 17, 5:27 PM MDT | Special Weather Statement | BYZ | 48 min |
| Oct 1, 9:10 AM MDT | Winter Weather Advisory | BYZ | 36 hr |
| Oct 3, 4:56 AM MDT | Dense Fog Advisory | BYZ | 4 hr |
| Oct 6, 1:56 PM MDT | Winter Storm Watch | BYZ | 49 hr |
| Oct 8, 4:02 AM MDT | Winter Storm Warning | BYZ | 47 hr |
| Nov 5, 3:10 AM MST | Winter Weather Advisory | BYZ | 32 hr |
| Nov 8, 2:39 PM MST | Winter Weather Advisory | BYZ | 54 hr |
| Nov 20, 8:49 AM MST | Special Weather Statement | BYZ | 116 min |
| Nov 26, 9:45 AM MST | Winter Storm Watch | BYZ | 25 hr |
| Nov 27, 8:00 AM MST | Special Weather Statement | BYZ | 2 hr |
| Nov 27, 10:22 AM MST | Winter Storm Warning | BYZ | 3 days |
| Nov 29, 8:04 AM MST | Special Weather Statement | BYZ | 4 hr |
| Dec 7, 3:14 AM MST | Winter Weather Advisory | BYZ | 41 hr |
| Dec 12, 7:38 AM MST | Special Weather Statement | BYZ | 3 hr |
| Dec 24, 11:28 PM MST | Special Weather Statement | BYZ | 2 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 | 8 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 21 |
| Special Weather Statement | 35 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 2 |
| Flood Watch | 1 |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 6 |
| Winter Weather Advisory | 10 |
| Cold | |
| Wind Chill Warning | 1 |
| Wind Chill Advisory | 10 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.