Alert archive / Michigan / Mason County
Weather alerts in Mason County, Michigan, 2018
77 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Mason County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 77
- Warnings
- 8
- Watches
- 8
- Advisories
- 30
- Busiest month
- August14 alerts
- Busiest day
- August 28, 20186 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Mason County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 3 | 0% | 8 | 100% | 34 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 Grand Rapids, MI: tornado warnings | 3 | 1 | 67% | 6 | 17% | 12 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 58 | 35 | 40% | 112 | 71% | 22 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 1, 7:10 AM EST | Special Weather Statement | GRR | 110 min |
| Jan 2, 2:24 AM EST | Winter Weather Advisory | GRR | 4 days |
| Jan 7, 12:20 PM EST | Winter Weather Advisory | GRR | 21 hr |
| Jan 10, 4:57 PM EST | Dense Fog Advisory | GRR | 11 hr |
| Jan 11, 11:07 AM EST | River Flood Advisory | GRR | 5 days |
| Jan 14, 12:05 PM EST | Special Weather Statement | GRR | 115 min |
| Jan 21, 9:03 PM EST | River Flood Advisory | GRR | 6 days |
| Jan 31, 3:31 PM EST | Winter Weather Advisory | GRR | 45 hr |
| Feb 2, 3:03 PM EST | Winter Weather Advisory | GRR | 52 hr |
| Feb 4, 10:17 PM EST | Winter Weather Advisory | GRR | 29 hr |
| Feb 6, 2:56 PM EST | Winter Weather Advisory | GRR | 25 hr |
| Feb 10, 2:45 PM EST | Winter Weather Advisory | GRR | 24 hr |
| Feb 18, 3:02 PM EST | Flood Watch | GRR | 45 hr |
| Feb 20, 1:42 PM EST | River Flood Advisory | GRR | 7 days |
| Feb 22, 3:36 PM EST | Winter Weather Advisory | GRR | 11 hr |
| Feb 25, 1:34 AM EST | Wind Advisory | GRR | 12 hr |
| Mar 6, 8:26 AM EST | Special Weather Statement | GRR | 3 hr |
| Mar 30, 2:53 PM EDT | Wind Advisory | GRR | 28 hr |
| Apr 2, 3:39 PM EDT | Winter Weather Advisory | GRR | 43 hr |
| Apr 5, 2:45 AM EDT | Winter Weather Advisory | GRR | 31 hr |
| Apr 12, 3:24 AM EDT | Winter Storm Watch | GRR | 36 hr |
| Apr 13, 11:44 AM EDT | Special Weather Statement | GRR | 91 min |
| Apr 13, 3:31 PM EDT | Winter Storm Warning | GRR | 54 hr |
| Apr 30, 12:28 PM EDT | Fire Weather Watch | GRR | 8 hr |
| Apr 30, 3:00 PM EDT | Red Flag Warning | GRR | 29 hr |
| May 10, 3:39 AM EDT | Freeze Warning | GRR | 30 hr |
| May 31, 3:09 PM EDT | Beach Hazards Statement | GRR | 31 hr |
| Jun 13, 11:34 AM EDT | Beach Hazards Statement | GRR | 4 hr |
| Jun 16, 2:31 PM EDT | Heat Advisory | GRR | 29 hr |
| Jun 27, 6:33 AM EDT | Areal Flood Advisory | GRR | 4 hr |
| Jun 28, 3:46 PM EDT | Beach Hazards Statement | GRR | 34 hr |
| Jun 29, 2:23 AM EDT | Excessive Heat Warning | GRR | 66 hr |
| Jun 30, 9:51 PM EDT | Beach Hazards Statement | GRR | 29 hr |
| Jul 1, 6:05 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 1, 6:35 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 1, 6:49 PM EDT | Severe Thunderstorm Warning | GRR | 56 min |
| Jul 4, 3:17 AM EDT | Heat Advisory | GRR | 17 hr |
| Jul 20, 5:26 AM EDT | Special Weather Statement | GRR | 64 min |
| Jul 26, 9:52 AM EDT | Beach Hazards Statement | GRR | 6 hr |
| Aug 1, 8:38 PM EDT | Special Weather Statement | GRR | 67 min |
| Aug 4, 9:56 PM EDT | Beach Hazards Statement | GRR | 22 hr |
| Aug 9, 4:05 AM EDT | Special Weather Statement | GRR | 85 min |
| Aug 20, 4:19 AM EDT | Beach Hazards Statement | GRR | 60 hr |
| Aug 23, 3:37 AM EDT | Beach Hazards Statement | GRR | 61 hr |
| Aug 26, 3:47 AM EDT | Beach Hazards Statement | GRR | 4 days |
| Aug 26, 8:55 PM EDT | Special Weather Statement | GRR | 65 min |
| Aug 27, 11:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 28, 12:54 AM EDT | Severe Thunderstorm Warning | GRR | 66 min |
| Aug 28, 10:59 AM EDT | Flood Watch | GRR | 16 hr |
| Aug 28, 4:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 28, 6:23 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 28, 6:42 PM EDT | Severe Thunderstorm Warning | GRR | 63 min |
| Aug 31, 3:54 PM EDT | Beach Hazards Statement | GRR | 23 hr |
| Sep 1, 9:04 AM EDT | Special Weather Statement | GRR | 56 min |
| Sep 1, 12:43 PM EDT | Flood Watch | GRR | 18 hr |
| Sep 2, 6:57 PM EDT | Special Weather Statement | GRR | 63 min |
| Sep 4, 3:02 PM EDT | Beach Hazards Statement | GRR | 29 hr |
| Sep 14, 3:40 AM EDT | Dense Fog Advisory | GRR | 6 hr |
| Sep 21, 3:33 AM EDT | Wind Advisory | GRR | 14 hr |
| Sep 21, 3:47 AM EDT | Beach Hazards Statement | GRR | 16 hr |
| Sep 25, 12:32 PM EDT | Beach Hazards Statement | GRR | 4 days |
| Oct 3, 10:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Oct 4, 12:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Oct 4, 12:50 AM EDT | Special Weather Statement | GRR | 40 min |
| Oct 12, 3:42 PM EDT | Frost Advisory | GRR | 17 hr |
| Oct 17, 3:52 AM EDT | Freeze Warning | GRR | 30 hr |
| Nov 8, 1:55 AM EST | Winter Weather Advisory | GRR | 56 hr |
| Nov 9, 2:44 PM EST | Lakeshore Flood Advisory | GRR | 21 hr |
| Nov 10, 9:39 PM EST | Winter Weather Advisory | GRR | 10 hr |
| Nov 15, 3:11 PM EST | Special Weather Statement | GRR | 3 hr |
| Nov 15, 5:27 PM EST | Winter Weather Advisory | GRR | 17 hr |
| Nov 24, 3:45 AM EST | Winter Storm Watch | GRR | 11 hr |
| Nov 24, 2:41 PM EST | Winter Weather Advisory | GRR | 46 hr |
| Dec 14, 9:50 PM EST | Freezing Fog Advisory | GRR | 7 hr |
| Dec 16, 5:13 AM EST | Freezing Fog Advisory | GRR | 8 hr |
| Dec 30, 3:13 PM EST | Winter Weather Advisory | GRR | 36 hr |
| Dec 31, 12:50 PM EST | Mesoscale Discussion | SPC | 6 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 | 3 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 6 |
| Special Weather Statement | 12 |
| Flooding | |
| Flood Watch | 3 |
| Areal Flood Advisory | 1 |
| River Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 15 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
| Freezing Fog Advisory | 2 |
| Coast and beach | |
| Lakeshore Flood Advisory | 1 |
| Beach Hazards Statement | 13 |
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.