Alert archive / Montana / Sweet Grass County
Weather alerts in Sweet Grass County, Montana, 2016
103 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sweet Grass County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 103
- Warnings
- 21
- Watches
- 10
- Advisories
- 34
- Busiest month
- December30 alerts
- Busiest day
- June 9, 20163 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sweet Grass County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 4 | 1 | 75% | 7 | 43% | 3 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 Billings, MT: tornado warnings | 4 | 0 | 100% | 4 | 0% | |
| NWS Billings, MT: severe thunderstorm warnings | 97 | 42 | 57% | 164 | 68% | 22 min |
| NWS Billings, MT: flash flood warnings | 2 | 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 10, 2:31 PM MST | Wind Advisory | BYZ | 4 days |
| Jan 20, 2:10 PM MST | Wind Advisory | BYZ | 61 hr |
| Jan 26, 3:21 AM MST | Wind Advisory | BYZ | 27 hr |
| Jan 27, 2:21 PM MST | Wind Advisory | BYZ | 37 hr |
| Feb 3, 3:10 PM MST | Wind Advisory | BYZ | 21 hr |
| Feb 5, 4:23 AM MST | Wind Advisory | BYZ | 34 hr |
| Feb 14, 2:42 PM MST | Wind Advisory | BYZ | 25 hr |
| Feb 17, 3:41 PM MST | Wind Advisory | BYZ | 49 hr |
| Feb 27, 3:22 AM MST | Wind Advisory | BYZ | 12 hr |
| Feb 28, 3:57 AM MST | Wind Advisory | BYZ | 23 hr |
| Mar 1, 2:55 PM MST | Wind Advisory | BYZ | 24 hr |
| Mar 8, 3:19 PM MST | Special Weather Statement | BYZ | 116 min |
| Mar 9, 2:18 AM MST | Wind Advisory | BYZ | 42 hr |
| Mar 13, 2:20 PM MDT | Winter Storm Warning | BYZ | 28 hr |
| Mar 16, 3:11 PM MDT | Winter Weather Advisory | BYZ | 30 hr |
| Mar 22, 3:29 AM MDT | Winter Weather Advisory | BYZ | 27 hr |
| Mar 27, 5:23 AM MDT | Winter Storm Watch | BYZ | 48 hr |
| Mar 27, 4:05 PM MDT | Winter Storm Warning | BYZ | 61 hr |
| Mar 30, 2:49 PM MDT | Winter Storm Warning | BYZ | 15 hr |
| Apr 4, 7:41 PM MDT | Special Weather Statement | BYZ | 64 min |
| Apr 4, 8:41 PM MDT | Wind Advisory | BYZ | 21 hr |
| Apr 6, 6:17 PM MDT | Special Weather Statement | BYZ | 118 min |
| Apr 18, 1:29 AM MDT | Winter Weather Advisory | BYZ | 34 hr |
| May 9, 2:40 PM MDT | Winter Weather Advisory | BYZ | 20 hr |
| May 21, 1:03 PM MDT | Special Weather Statement | BYZ | 27 min |
| Jun 7, 12:50 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 7, 6:18 PM MDT | Severe Thunderstorm Warning | BYZ | 42 min |
| Jun 8, 2:39 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 8, 9:01 PM MDT | Special Weather Statement | BYZ | 44 min |
| Jun 9, 1:01 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 9, 2:51 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 9, 6:05 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 10, 2:21 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jun 14, 1:00 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 12:52 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jun 29, 4:11 PM MDT | Severe Thunderstorm Warning | BYZ | 64 min |
| Jul 3, 3:18 PM MDT | Special Weather Statement | BYZ | 57 min |
| Jul 3, 9:30 PM MDT | Special Weather Statement | BYZ | 45 min |
| Jul 8, 5:12 PM MDT | Special Weather Statement | BYZ | 78 min |
| Jul 8, 6:36 PM MDT | Special Weather Statement | BYZ | 54 min |
| Jul 9, 3:28 PM MDT | Special Weather Statement | BYZ | 62 min |
| Jul 10, 7:05 PM MDT | Special Weather Statement | BYZ | 55 min |
| Jul 12, 8:13 PM MDT | Special Weather Statement | BYZ | 62 min |
| Jul 15, 6:55 PM MDT | Special Weather Statement | BYZ | 35 min |
| Jul 15, 7:35 PM MDT | Severe Thunderstorm Warning | BYZ | 40 min |
| Jul 16, 6:19 PM MDT | Severe Thunderstorm Warning | BYZ | 41 min |
| Jul 19, 3:41 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jul 27, 1:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 8:59 AM MDT | Red Flag Warning | BYZ | 12 hr |
| Aug 1, 2:28 PM MDT | Fire Weather Watch | BYZ | 13 hr |
| Aug 2, 3:15 AM MDT | Red Flag Warning | BYZ | 42 hr |
| Aug 6, 2:37 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 6, 3:54 PM MDT | Special Weather Statement | BYZ | 51 min |
| Aug 6, 6:42 PM MDT | Special Weather Statement | BYZ | 48 min |
| Aug 7, 1:52 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 6:00 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 22, 3:11 AM MDT | Red Flag Warning | BYZ | 18 hr |
| Aug 31, 2:51 PM MDT | Fire Weather Watch | BYZ | 21 hr |
| Sep 1, 11:26 AM MDT | Red Flag Warning | BYZ | 34 hr |
| Sep 1, 6:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Sep 22, 2:47 AM MDT | Special Weather Statement | BYZ | 3 hr |
| Oct 2, 2:51 AM MDT | Winter Storm Watch | BYZ | 24 hr |
| Oct 3, 2:40 AM MDT | Winter Storm Warning | BYZ | 33 hr |
| Oct 7, 8:26 AM MDT | Special Weather Statement | BYZ | 94 min |
| Oct 10, 4:16 AM MDT | Winter Weather Advisory | BYZ | 40 hr |
| Oct 13, 3:49 AM MDT | Wind Advisory | BYZ | 40 hr |
| Oct 30, 7:43 PM MDT | Wind Advisory | BYZ | 19 hr |
| Nov 14, 3:28 AM MST | Wind Advisory | BYZ | 17 hr |
| Nov 15, 1:52 PM MST | Winter Storm Watch | BYZ | 14 hr |
| Nov 16, 4:11 AM MST | Winter Storm Warning | BYZ | 40 hr |
| Nov 16, 4:11 AM MST | Winter Weather Advisory | BYZ | 40 hr |
| Nov 24, 2:58 AM MST | Wind Advisory | BYZ | 42 hr |
| Nov 29, 6:14 AM MST | Special Weather Statement | BYZ | 2 hr |
| Dec 1, 2:40 PM MST | Wind Advisory | BYZ | 3 days |
| Dec 3, 3:17 AM MST | Winter Storm Watch | BYZ | 15 hr |
| Dec 3, 6:07 PM MST | Winter Storm Warning | BYZ | 39 hr |
| Dec 4, 4:11 AM MST | Winter Weather Advisory | BYZ | 34 hr |
| Dec 9, 9:45 AM MST | Winter Weather Advisory | BYZ | 32 hr |
| Dec 9, 4:45 PM MST | Winter Storm Warning | BYZ | 25 hr |
| Dec 10, 7:18 PM MST | Special Weather Statement | BYZ | 117 min |
| Dec 11, 2:48 PM MST | Winter Weather Advisory | BYZ | 24 hr |
| Dec 13, 3:21 PM MST | Winter Storm Watch | BYZ | 23 hr |
| Dec 14, 4:59 AM MST | Winter Storm Warning | BYZ | 71 hr |
| Dec 15, 3:26 PM MST | Special Weather Statement | BYZ | 3 hr |
| Dec 15, 6:03 PM MST | Special Weather Statement | BYZ | 117 min |
| Dec 16, 2:59 PM MST | Blizzard Watch | BYZ | 23 hr |
| Dec 16, 2:59 PM MST | Wind Chill Warning | BYZ | 20 hr |
| Dec 17, 7:36 AM MST | Special Weather Statement | BYZ | 114 min |
| Dec 17, 8:50 AM MST | Winter Weather Advisory | BYZ | 63 hr |
| Dec 17, 2:21 PM MST | Blizzard Warning | BYZ | 46 hr |
| Dec 18, 2:24 PM MST | High Wind Warning | BYZ | 38 hr |
| Dec 19, 9:05 PM MST | Wind Advisory | BYZ | 30 hr |
| Dec 20, 7:10 PM MST | Special Weather Statement | BYZ | 35 min |
| Dec 23, 11:42 AM MST | Winter Weather Advisory | BYZ | 67 hr |
| Dec 25, 3:51 PM MST | High Wind Watch | BYZ | 10 hr |
| Dec 25, 7:07 PM MST | Special Weather Statement | BYZ | 4 hr |
| Dec 26, 1:58 AM MST | High Wind Warning | BYZ | 42 hr |
| Dec 26, 1:58 AM MST | Wind Advisory | BYZ | 22 hr |
| Dec 27, 7:29 PM MST | Wind Advisory | BYZ | 46 hr |
| Dec 29, 3:02 PM MST | Winter Weather Advisory | BYZ | 30 hr |
| Dec 29, 5:28 PM MST | High Wind Warning | BYZ | 17 hr |
| Dec 31, 6:10 AM MST | Special Weather Statement | BYZ | 110 min |
| Dec 31, 8:22 AM MST | Winter Weather Advisory | BYZ | 8 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 | 4 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 25 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 8 |
| Blizzard Watch | 1 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 13 |
| Cold | |
| Wind Chill Warning | 1 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
| Wind Advisory | 21 |
| Fire | |
| Red Flag Warning | 4 |
| Fire Weather Watch | 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.