Alert archive / Michigan / Mason County
Weather alerts in Mason County, Michigan, 2019
113 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 113
- Warnings
- 14
- Watches
- 10
- Advisories
- 62
- Busiest month
- January14 alerts
- Busiest day
- July 20, 20197 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, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 2 | 33% | 5 | 80% | 26 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 5 | 0 | 100% | 1 | 0% | |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 72 | 37 | 49% | 146 | 68% | 23 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 2, 3:24 AM EST | Winter Weather Advisory | GRR | 18 hr |
| Jan 5, 3:38 AM EST | Dense Fog Advisory | GRR | 6 hr |
| Jan 6, 3:25 AM EST | Winter Weather Advisory | GRR | 37 hr |
| Jan 8, 3:33 AM EST | Winter Weather Advisory | GRR | 36 hr |
| Jan 14, 3:15 PM EST | Winter Weather Advisory | GRR | 12 hr |
| Jan 15, 5:52 AM EST | Winter Weather Advisory | GRR | 28 hr |
| Jan 19, 3:27 PM EST | Winter Weather Advisory | GRR | 24 hr |
| Jan 20, 10:45 AM EST | Wind Chill Advisory | GRR | 25 hr |
| Jan 21, 3:25 PM EST | Winter Weather Advisory | GRR | 47 hr |
| Jan 23, 3:24 PM EST | Winter Weather Advisory | GRR | 59 hr |
| Jan 26, 4:10 AM EST | Winter Weather Advisory | GRR | 21 hr |
| Jan 26, 3:18 PM EST | Winter Storm Watch | GRR | 12 hr |
| Jan 27, 3:21 AM EST | Winter Storm Warning | GRR | 5 days |
| Jan 28, 3:42 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 2, 2:44 PM EST | Dense Fog Advisory | GRR | 15 hr |
| Feb 3, 5:49 PM EST | Dense Fog Advisory | GRR | 16 hr |
| Feb 4, 3:43 PM EST | Winter Weather Advisory | GRR | 4 days |
| Feb 5, 7:24 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 7, 12:35 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Feb 10, 3:30 PM EST | Winter Weather Advisory | GRR | 70 hr |
| Feb 11, 1:40 PM EST | Winter Storm Warning | GRR | 25 hr |
| Feb 19, 2:36 PM EST | Winter Weather Advisory | GRR | 31 hr |
| Feb 21, 3:25 PM EST | Winter Storm Watch | GRR | 48 hr |
| Feb 23, 11:25 AM EST | Lakeshore Flood Statement | GRR | 40 hr |
| Feb 23, 3:32 PM EST | Blizzard Warning | GRR | 36 hr |
| Feb 26, 3:14 AM EST | Winter Weather Advisory | GRR | 34 hr |
| Mar 4, 3:04 AM EST | Winter Weather Advisory | GRR | 3 days |
| Mar 9, 3:07 AM EST | Winter Weather Advisory | GRR | 22 hr |
| Mar 10, 3:14 AM EDT | Wind Advisory | GRR | 17 hr |
| Mar 13, 11:31 AM EDT | Flood Watch | GRR | 31 hr |
| Mar 14, 9:48 AM EDT | Wind Advisory | GRR | 13 hr |
| Mar 14, 6:12 PM EDT | Areal Flood Warning | GRR | 20 hr |
| Mar 15, 2:04 PM EDT | Areal Flood Advisory | GRR | 6 days |
| Apr 13, 3:22 PM EDT | Winter Weather Advisory | GRR | 36 hr |
| Apr 22, 9:58 AM EDT | Red Flag Warning | GRR | 10 hr |
| Apr 26, 3:39 AM EDT | Wind Advisory | GRR | 17 hr |
| May 10, 3:33 AM EDT | Freeze Warning | GRR | 28 hr |
| May 20, 3:42 AM EDT | Frost Advisory | GRR | 28 hr |
| May 31, 9:29 PM EDT | Severe Thunderstorm Warning | GRR | 46 min |
| Jun 1, 11:35 AM EDT | Special Weather Statement | GRR | 85 min |
| Jun 2, 3:47 AM EDT | Frost Advisory | GRR | 28 hr |
| Jun 5, 2:07 AM EDT | Special Weather Statement | GRR | 53 min |
| Jun 12, 3:46 PM EDT | Beach Hazards Statement | GRR | 28 hr |
| Jun 12, 3:46 PM EDT | Lakeshore Flood Advisory | GRR | 28 hr |
| Jun 14, 3:23 AM EDT | Beach Hazards Statement | GRR | 19 hr |
| Jul 10, 4:03 PM EDT | Beach Hazards Statement | GRR | 31 hr |
| Jul 17, 3:37 PM EDT | Beach Hazards Statement | GRR | 52 hr |
| Jul 18, 3:27 AM EDT | Heat Advisory | GRR | 65 hr |
| Jul 19, 10:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 19, 10:55 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 19, 11:49 PM EDT | Severe Thunderstorm Warning | GRR | 56 min |
| Jul 20, 8:58 AM EDT | Areal Flood Advisory | GRR | 2 hr |
| Jul 20, 10:54 AM EDT | Areal Flood Warning | GRR | 36 hr |
| Jul 20, 1:45 PM EDT | Severe Thunderstorm Warning | GRR | 60 min |
| Jul 20, 2:15 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 26, 3:43 AM EDT | Beach Hazards Statement | GRR | 44 hr |
| Jul 26, 10:47 AM EDT | Lakeshore Flood Advisory | GRR | 37 hr |
| Jul 28, 3:05 AM EDT | Beach Hazards Statement | GRR | 41 hr |
| Jul 30, 10:19 AM EDT | Beach Hazards Statement | GRR | 13 hr |
| Aug 16, 5:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 17, 4:08 PM EDT | Beach Hazards Statement | GRR | 28 hr |
| Aug 26, 2:53 AM EDT | Beach Hazards Statement | GRR | 4 days |
| Aug 27, 3:54 PM EDT | Lakeshore Flood Advisory | GRR | 57 hr |
| Aug 29, 2:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Sep 2, 4:10 AM EDT | Beach Hazards Statement | GRR | 60 hr |
| Sep 2, 4:10 AM EDT | Lakeshore Flood Watch | GRR | 12 hr |
| Sep 2, 3:59 PM EDT | Lakeshore Flood Warning | GRR | 36 hr |
| Sep 4, 3:46 AM EDT | Lakeshore Flood Advisory | GRR | 12 hr |
| Sep 5, 3:22 PM EDT | Beach Hazards Statement | GRR | 32 hr |
| Sep 10, 3:48 AM EDT | Beach Hazards Statement | GRR | 19 hr |
| Sep 11, 2:31 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 14, 3:12 AM EDT | Beach Hazards Statement | GRR | 9 hr |
| Sep 14, 3:41 PM EDT | Beach Hazards Statement | GRR | 25 hr |
| Sep 20, 4:06 PM EDT | Beach Hazards Statement | GRR | 3 days |
| Sep 20, 4:06 PM EDT | Lakeshore Flood Advisory | GRR | 3 days |
| Sep 24, 3:58 AM EDT | Beach Hazards Statement | GRR | 60 hr |
| Sep 24, 3:58 AM EDT | Lakeshore Flood Advisory | GRR | 36 hr |
| Sep 26, 9:16 PM EDT | Beach Hazards Statement | GRR | 23 hr |
| Oct 1, 3:56 AM EDT | Flood Watch | GRR | 31 hr |
| Oct 1, 9:04 PM EDT | Areal Flood Advisory | GRR | 37 hr |
| Oct 4, 3:11 AM EDT | Frost Advisory | GRR | 29 hr |
| Oct 7, 3:19 PM EDT | Frost Advisory | GRR | 17 hr |
| Oct 10, 4:04 PM EDT | Lakeshore Flood Advisory | GRR | 3 days |
| Oct 11, 11:25 AM EDT | Areal Flood Advisory | GRR | 6 hr |
| Oct 14, 3:20 AM EDT | Frost Advisory | GRR | 29 hr |
| Oct 15, 3:29 AM EDT | Wind Advisory | GRR | 43 hr |
| Oct 15, 3:36 AM EDT | Lakeshore Flood Advisory | GRR | 12 hr |
| Oct 15, 3:59 PM EDT | Lakeshore Flood Warning | GRR | 30 hr |
| Oct 17, 3:25 AM EDT | Frost Advisory | GRR | 29 hr |
| Oct 21, 3:58 AM EDT | Lakeshore Flood Warning | GRR | 55 hr |
| Oct 30, 3:52 PM EDT | Winter Weather Advisory | GRR | 35 hr |
| Oct 30, 3:57 PM EDT | Lakeshore Flood Advisory | GRR | 35 hr |
| Nov 5, 3:51 PM EST | Winter Weather Advisory | GRR | 32 hr |
| Nov 7, 11:36 AM EST | Winter Weather Advisory | GRR | 17 hr |
| Nov 8, 11:10 AM EST | Lakeshore Flood Advisory | GRR | 31 hr |
| Nov 10, 12:08 PM EST | Winter Weather Advisory | GRR | 53 hr |
| Nov 12, 9:50 PM EST | Lakeshore Flood Advisory | GRR | 18 hr |
| Nov 13, 3:40 AM EST | Winter Weather Advisory | GRR | 24 hr |
| Nov 20, 3:11 PM EST | Lakeshore Flood Advisory | GRR | 34 hr |
| Nov 24, 7:46 PM EST | Lakeshore Flood Watch | GRR | 43 hr |
| Nov 25, 3:23 PM EST | High Wind Watch | GRR | 24 hr |
| Nov 26, 2:56 PM EST | Lakeshore Flood Warning | GRR | 37 hr |
| Nov 26, 3:04 PM EST | Wind Advisory | GRR | 30 hr |
| Nov 29, 3:52 PM EST | Winter Weather Advisory | GRR | 49 hr |
| Dec 1, 2:36 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 6, 3:44 PM EST | Lakeshore Flood Advisory | GRR | 46 hr |
| Dec 11, 2:45 PM EST | Lakeshore Flood Advisory | GRR | 36 hr |
| Dec 14, 6:01 PM EST | Winter Weather Advisory | GRR | 6 hr |
| Dec 17, 3:35 AM EST | Lakeshore Flood Advisory | GRR | 35 hr |
| Dec 17, 3:55 AM EST | Winter Weather Advisory | GRR | 35 hr |
| Dec 29, 3:29 AM EST | Lakeshore Flood Advisory | GRR | 51 hr |
| Dec 29, 3:53 PM EST | Areal Flood Advisory | GRR | 42 hr |
| Dec 29, 4:06 PM EST | Winter Weather Advisory | GRR | 44 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 | 3 |
| Mesoscale Discussion | 7 |
| Special Weather Statement | 2 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flood Watch | 2 |
| Areal Flood Advisory | 5 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 25 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 6 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Watch | 1 |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
| Coast and beach | |
| Lakeshore Flood Warning | 4 |
| Lakeshore Flood Watch | 2 |
| Lakeshore Flood Advisory | 16 |
| Beach Hazards Statement | 17 |
| Lakeshore Flood Statement | 1 |
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.