Alert archive / Michigan / Mason County
Weather alerts in Mason County, Michigan, 2025
90 weather alerts in 2025, 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 2025. Tap one for its archive.
- Alerts
- 90
- Warnings
- 14
- Watches
- 4
- Advisories
- 40
- Busiest month
- May12 alerts
- Busiest day
- May 16, 20255 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, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 4 | 2 | 50% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 17 | 8 | 53% | 19 | 63% | 14 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 58 | 31 | 47% | 151 | 82% | 33 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, 2:59 PM EST | Winter Weather Advisory | GRR | 34 hr |
| Jan 9, 2:51 PM EST | Winter Weather Advisory | GRR | 43 hr |
| Jan 13, 3:13 AM EST | Winter Weather Advisory | GRR | 40 hr |
| Jan 18, 2:55 AM EST | Winter Weather Advisory | GRR | 4 days |
| Jan 19, 11:53 AM EST | Cold Weather Advisory | GRR | 3 days |
| Jan 21, 3:38 PM EST | Winter Storm Warning | GRR | 36 hr |
| Jan 22, 2:44 AM EST | Winter Weather Advisory | GRR | 40 hr |
| Jan 26, 1:50 PM EST | Wind Advisory | GRR | 32 hr |
| Jan 27, 5:27 PM EST | Winter Weather Advisory | GRR | 8 hr |
| Feb 2, 6:40 PM EST | Dense Fog Advisory | GRR | 16 hr |
| Feb 5, 2:46 PM EST | Wind Advisory | GRR | 34 hr |
| Feb 7, 2:09 PM EST | Winter Weather Advisory | GRR | 33 hr |
| Feb 10, 2:17 PM EST | Winter Storm Watch | GRR | 24 hr |
| Feb 11, 2:20 PM EST | Winter Weather Advisory | GRR | 47 hr |
| Feb 14, 3:01 AM EST | Winter Weather Advisory | GRR | 4 days |
| Feb 28, 2:50 AM EST | Wind Advisory | GRR | 19 hr |
| Feb 28, 3:44 PM EST | Winter Weather Advisory | GRR | 20 hr |
| Mar 5, 3:08 AM EST | Wind Advisory | GRR | 28 hr |
| Mar 14, 3:34 PM EDT | Wind Advisory | GRR | 28 hr |
| Mar 19, 12:01 PM EDT | Wind Advisory | GRR | 24 hr |
| Mar 21, 3:30 AM EDT | Wind Advisory | GRR | 15 hr |
| Mar 23, 2:43 PM EDT | Winter Weather Advisory | GRR | 22 hr |
| Apr 1, 2:22 PM EDT | Winter Weather Advisory | GRR | 22 hr |
| Apr 18, 10:36 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Apr 18, 9:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Apr 18, 9:56 PM EDT | Severe Thunderstorm Warning | GRR | 27 min |
| Apr 18, 10:13 PM EDT | Severe Thunderstorm Warning | GRR | 20 min |
| Apr 21, 10:17 AM EDT | Wind Advisory | GRR | 10 hr |
| Apr 28, 9:15 AM EDT | Red Flag Warning | GRR | 9 hr |
| Apr 29, 8:25 AM EDT | Wind Advisory | GRR | 7 hr |
| Apr 29, 3:45 PM EDT | Freeze Warning | GRR | 16 hr |
| May 8, 10:36 AM EDT | Freeze Warning | GRR | 22 hr |
| May 10, 3:23 PM EDT | Frost Advisory | GRR | 17 hr |
| May 15, 7:50 PM EDT | Mesoscale Discussion | SPC | 85 min |
| May 15, 8:22 PM EDT | Tornado Watch | SPC | 5 hr |
| May 15, 9:16 PM EDT | Severe Thunderstorm Warning | GRR | 89 min |
| May 15, 10:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 16, 7:33 PM EDT | Special Weather Statement | GRR | 42 min |
| May 16, 7:53 PM EDT | Severe Thunderstorm Warning | GRR | 37 min |
| May 16, 8:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 21, 2:22 PM EDT | Beach Hazards Statement | GRR | 34 hr |
| May 24, 3:23 PM EDT | Frost Advisory | GRR | 17 hr |
| May 31, 12:39 PM EDT | Frost Advisory | GRR | 19 hr |
| Jun 2, 3:58 AM EDT | Beach Hazards Statement | GRR | 52 hr |
| Jun 9, 2:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 9, 3:10 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 10, 3:29 PM EDT | Beach Hazards Statement | GRR | 24 hr |
| Jun 20, 3:18 PM EDT | Heat Advisory | GRR | 4 days |
| Jun 20, 3:38 PM EDT | Beach Hazards Statement | GRR | 3 days |
| Jun 26, 11:21 PM EDT | Special Weather Statement | GRR | 84 min |
| Jul 2, 4:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 4, 3:37 PM EDT | Beach Hazards Statement | GRR | 55 hr |
| Jul 16, 10:55 AM EDT | Beach Hazards Statement | GRR | 37 hr |
| Jul 16, 8:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 22, 3:40 PM EDT | Beach Hazards Statement | GRR | 32 hr |
| Jul 23, 9:09 PM EDT | Special Weather Statement | GRR | 51 min |
| Jul 28, 2:10 AM EDT | Heat Advisory | GRR | 19 hr |
| Jul 31, 3:43 AM EDT | Beach Hazards Statement | GRR | 25 hr |
| Aug 8, 3:35 PM EDT | Beach Hazards Statement | GRR | 31 hr |
| Aug 10, 4:47 AM EDT | Beach Hazards Statement | GRR | 10 hr |
| Aug 12, 8:17 AM EDT | Special Weather Statement | GRR | 58 min |
| Aug 12, 9:11 AM EDT | Special Weather Statement | GRR | 64 min |
| Aug 17, 4:30 AM EDT | Beach Hazards Statement | GRR | 14 hr |
| Aug 20, 3:01 AM EDT | Beach Hazards Statement | GRR | 24 hr |
| Aug 23, 9:18 AM EDT | Beach Hazards Statement | GRR | 60 hr |
| Aug 27, 3:07 PM EDT | Beach Hazards Statement | GRR | 36 hr |
| Sep 2, 1:31 PM EDT | Beach Hazards Statement | GRR | 4 days |
| Sep 8, 2:24 PM EDT | Beach Hazards Statement | GRR | 27 hr |
| Sep 22, 7:25 AM EDT | Special Weather Statement | GRR | 65 min |
| Oct 4, 3:37 PM EDT | Beach Hazards Statement | GRR | 35 hr |
| Oct 8, 1:17 PM EDT | Freeze Warning | GRR | 20 hr |
| Nov 8, 2:21 PM EST | Winter Weather Advisory | GRR | 35 hr |
| Nov 10, 3:32 AM EST | Winter Storm Warning | GRR | 22 hr |
| Nov 10, 9:47 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Nov 25, 2:36 PM EST | Winter Storm Warning | GRR | 44 hr |
| Nov 25, 2:36 PM EST | Winter Weather Advisory | GRR | 64 hr |
| Nov 25, 2:54 PM EST | High Wind Warning | GRR | 40 hr |
| Nov 27, 6:50 AM EST | Wind Advisory | GRR | 3 hr |
| Nov 28, 3:09 PM EST | Winter Weather Advisory | GRR | 52 hr |
| Dec 1, 1:57 AM EST | Winter Storm Warning | GRR | 29 hr |
| Dec 8, 3:27 AM EST | Winter Weather Advisory | GRR | 31 hr |
| Dec 9, 3:15 AM EST | Winter Weather Advisory | GRR | 36 hr |
| Dec 13, 3:06 AM EST | Winter Weather Advisory | GRR | 32 hr |
| Dec 18, 2:38 AM EST | Winter Weather Advisory | GRR | 37 hr |
| Dec 19, 3:33 AM EST | Wind Advisory | GRR | 10 hr |
| Dec 20, 7:46 PM EST | Wind Advisory | GRR | 8 hr |
| Dec 25, 10:29 AM EST | Winter Weather Advisory | GRR | 27 hr |
| Dec 27, 2:45 PM EST | Winter Storm Watch | GRR | 20 hr |
| Dec 28, 10:43 AM EST | Winter Storm Warning | GRR | 37 hr |
| Dec 30, 2:43 PM EST | Winter Weather Advisory | GRR | 36 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 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 9 |
| Special Weather Statement | 6 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 21 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 3 |
| Cold Weather Advisory | 1 |
| Frost Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 12 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
| Coast and beach | |
| Beach Hazards Statement | 17 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
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.