Alert archive / Montana / Sheridan County
Weather alerts in Sheridan County, Montana, 2016
94 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sheridan County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 94
- Warnings
- 15
- Watches
- 11
- Advisories
- 28
- Busiest month
- June37 alerts
- Busiest day
- June 19, 20164 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado reports fell inside a warning.
Sheridan County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 1 | 0% | |||
| Severe thunderstorm warnings | 10 | 5 | 50% | 3 | 100% | 26 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: tornado warnings | 3 | 0 | 100% | 1 | 0% | |
| NWS Glasgow, MT: severe thunderstorm warnings | 144 | 78 | 46% | 242 | 78% | 28 min |
| NWS Glasgow, MT: flash flood warnings | 1 | 1 | 0% | 1 | 100% | 7 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 14, 2:03 PM MST | Freezing Rain Advisory | GGW | 6 hr |
| Jan 15, 2:17 PM MST | Wind Chill Advisory | GGW | 44 hr |
| Jan 17, 2:08 PM MST | Wind Chill Advisory | GGW | 19 hr |
| Jan 19, 10:10 PM MST | Freezing Fog Advisory | GGW | 13 hr |
| Jan 25, 8:29 PM MST | Dense Fog Advisory | GGW | 13 hr |
| Jan 27, 3:25 AM MST | High Wind Warning | GGW | 7 hr |
| Feb 2, 10:04 PM MST | Dense Fog Advisory | GGW | 8 hr |
| Feb 5, 3:54 AM MST | High Wind Watch | GGW | 11 hr |
| Feb 5, 2:34 PM MST | High Wind Warning | GGW | 50 hr |
| Feb 10, 9:35 PM MST | Winter Weather Advisory | GGW | 14 hr |
| Feb 13, 8:47 AM MST | Freezing Rain Advisory | GGW | 6 hr |
| Feb 16, 7:58 AM MST | Freezing Rain Advisory | GGW | 4 hr |
| Feb 16, 8:13 PM MST | Dense Fog Advisory | GGW | 19 hr |
| Feb 17, 7:45 PM MST | Dense Fog Advisory | GGW | 22 hr |
| Feb 18, 6:07 PM MST | Dense Fog Advisory | GGW | 3 hr |
| Mar 1, 1:26 PM MST | Winter Weather Advisory | GGW | 13 hr |
| Apr 6, 2:44 PM MDT | Special Weather Statement | GGW | 46 min |
| Apr 6, 4:26 PM MDT | Special Weather Statement | GGW | 49 min |
| May 21, 2:26 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 21, 6:38 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jun 8, 2:33 PM MDT | Heat Advisory | GGW | 28 hr |
| Jun 9, 1:01 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 9, 2:19 PM MDT | Severe Thunderstorm Warning | GGW | 24 min |
| Jun 9, 6:05 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 9, 6:42 PM MDT | Special Weather Statement | GGW | 48 min |
| Jun 9, 6:57 PM MDT | Severe Thunderstorm Warning | GGW | 18 min |
| Jun 11, 11:15 AM MDT | Special Weather Statement | GGW | 60 min |
| Jun 11, 3:00 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 11, 7:36 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 11, 9:28 PM MDT | Areal Flood Advisory | GGW | 3 hr |
| Jun 13, 1:37 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jun 13, 3:40 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jun 13, 4:07 PM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 13, 6:00 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jun 14, 8:56 PM MDT | Special Weather Statement | GGW | 64 min |
| Jun 14, 9:54 PM MDT | Special Weather Statement | GGW | 66 min |
| Jun 14, 11:39 PM MDT | Special Weather Statement | GGW | 51 min |
| Jun 15, 10:04 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jun 16, 2:19 AM MDT | Special Weather Statement | GGW | 41 min |
| Jun 16, 3:01 AM MDT | Special Weather Statement | GGW | 44 min |
| Jun 18, 2:43 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jun 18, 3:16 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 18, 5:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 8:58 PM MDT | Mesoscale Discussion | SPC | 62 min |
| Jun 18, 9:02 PM MDT | Severe Thunderstorm Warning | GGW | 58 min |
| Jun 18, 9:54 PM MDT | Severe Thunderstorm Warning | GGW | 66 min |
| Jun 19, 12:03 AM MDT | Severe Thunderstorm Warning | GGW | 42 min |
| Jun 21, 1:46 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jun 21, 3:09 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 21, 6:35 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jun 21, 10:26 PM MDT | Special Weather Statement | GGW | 49 min |
| Jun 24, 3:51 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 24, 4:16 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 24, 7:06 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 24, 7:50 PM MDT | Severe Thunderstorm Warning | GGW | 55 min |
| Jun 24, 8:45 PM MDT | Severe Thunderstorm Warning | GGW | 60 min |
| Jun 24, 9:37 PM MDT | Special Weather Statement | GGW | 38 min |
| Jul 2, 12:49 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 9, 10:35 PM MDT | Special Weather Statement | GGW | 55 min |
| Jul 19, 12:19 AM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 19, 1:28 AM MDT | Special Weather Statement | GGW | 62 min |
| Jul 22, 3:06 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 22, 9:56 PM MDT | Severe Thunderstorm Warning | GGW | 64 min |
| Jul 22, 10:54 PM MDT | Special Weather Statement | GGW | 66 min |
| Jul 31, 1:27 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 4:42 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 5:15 PM MDT | Severe Thunderstorm Warning | GGW | 60 min |
| Jul 31, 6:07 PM MDT | Severe Thunderstorm Warning | GGW | 16 min |
| Aug 10, 1:08 PM MDT | Special Weather Statement | GGW | 52 min |
| Aug 10, 2:26 PM MDT | Special Weather Statement | GGW | 64 min |
| Aug 10, 2:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Aug 10, 9:54 PM MDT | Special Weather Statement | GGW | 51 min |
| Aug 17, 6:02 PM MDT | Special Weather Statement | GGW | 58 min |
| Aug 17, 6:50 PM MDT | Special Weather Statement | GGW | 40 min |
| Sep 2, 4:16 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 9:26 PM MDT | Special Weather Statement | GGW | 64 min |
| Oct 20, 3:10 AM MDT | Freezing Fog Advisory | GGW | 9 hr |
| Nov 27, 3:09 AM MST | Winter Storm Watch | GGW | 24 hr |
| Nov 28, 3:15 AM MST | Winter Weather Advisory | GGW | 50 hr |
| Dec 5, 3:07 AM MST | Winter Weather Advisory | GGW | 7 hr |
| Dec 5, 9:52 AM MST | Blizzard Warning | GGW | 13 hr |
| Dec 5, 10:45 PM MST | Wind Chill Advisory | GGW | 36 hr |
| Dec 5, 10:45 PM MST | Winter Weather Advisory | GGW | 5 hr |
| Dec 7, 11:18 AM MST | Wind Chill Advisory | GGW | 25 hr |
| Dec 8, 11:59 AM MST | Wind Chill Advisory | GGW | 24 hr |
| Dec 9, 2:04 PM MST | Winter Weather Advisory | GGW | 37 hr |
| Dec 11, 2:58 AM MST | Wind Chill Advisory | GGW | 54 hr |
| Dec 13, 3:05 PM MST | Wind Chill Advisory | GGW | 20 hr |
| Dec 15, 2:36 PM MST | Wind Chill Advisory | GGW | 45 hr |
| Dec 17, 12:13 PM MST | Wind Chill Advisory | GGW | 21 hr |
| Dec 21, 2:28 PM MST | Winter Storm Watch | GGW | 48 hr |
| Dec 23, 2:52 PM MST | Winter Storm Warning | GGW | 68 hr |
| Dec 24, 9:42 PM MST | Blizzard Warning | GGW | 37 hr |
| Dec 30, 12:37 PM MST | Winter Weather Advisory | GGW | 7 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 | 10 |
| Severe Thunderstorm Watch | 8 |
| Mesoscale Discussion | 20 |
| Special Weather Statement | 20 |
| Flooding | |
| Areal Flood Advisory | 1 |
| Winter | |
| Blizzard Warning | 2 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Freezing Rain Advisory | 3 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Wind Chill Advisory | 9 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Freezing Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20152017
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.