Alert archive / Michigan / Mason County
Weather alerts in Mason County, Michigan, 2026
102 weather alerts in 2026, 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 2026. Tap one for its archive.
- Alerts
- 102
- Warnings
- 18
- Watches
- 13
- Advisories
- 30
- Busiest month
- April16 alerts
- Busiest day
- April 14, 20267 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, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 2 | 71% | 1 | 100% | 21 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 23 | 3 | 87% | 8 | 75% | 7 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 131 | 61 | 53% | 233 | 86% | 31 min |
| NWS Grand Rapids, MI: flash flood warnings | 3 | 1 | 67% | 8 | 25% | 28 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
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 4, 3:24 AM EST | Winter Weather Advisory | GRR | 27 hr |
| Jan 5, 12:31 PM EST | Winter Weather Advisory | GRR | 24 hr |
| Jan 9, 2:08 AM EST | Wind Advisory | GRR | 14 hr |
| Jan 9, 3:19 PM EST | Winter Weather Advisory | GRR | 43 hr |
| Jan 13, 2:12 PM EST | Winter Weather Advisory | GRR | 41 hr |
| Jan 15, 12:48 PM EST | Winter Weather Advisory | GRR | 66 hr |
| Jan 17, 3:00 PM EST | Winter Storm Watch | GRR | 13 hr |
| Jan 18, 3:51 AM EST | Winter Storm Warning | GRR | 51 hr |
| Jan 20, 2:26 PM EST | Winter Weather Advisory | GRR | 21 hr |
| Jan 21, 2:28 PM EST | Winter Weather Advisory | GRR | 65 hr |
| Jan 21, 3:30 PM EST | Extreme Cold Watch | GRR | 11 hr |
| Jan 22, 2:43 AM EST | Cold Weather Advisory | GRR | 56 hr |
| Jan 22, 3:36 PM EST | Extreme Cold Warning | GRR | 43 hr |
| Jan 26, 1:48 PM EST | Winter Weather Advisory | GRR | 68 hr |
| Jan 29, 2:42 PM EST | Cold Weather Advisory | GRR | 19 hr |
| Feb 2, 9:58 AM EST | Winter Weather Advisory | GRR | 9 hr |
| Feb 5, 10:34 AM EST | Winter Weather Advisory | GRR | 24 hr |
| Feb 21, 2:42 PM EST | Winter Weather Advisory | GRR | 40 hr |
| Mar 7, 3:25 AM EST | Special Weather Statement | GRR | 65 min |
| Mar 12, 2:45 AM EDT | High Wind Watch | GRR | 10 hr |
| Mar 12, 12:07 PM EDT | Winter Weather Advisory | GRR | 35 hr |
| Mar 12, 12:54 PM EDT | High Wind Warning | GRR | 34 hr |
| Mar 13, 3:44 AM EDT | Winter Storm Watch | GRR | 33 hr |
| Mar 14, 12:52 PM EDT | Winter Weather Advisory | GRR | 22 hr |
| Mar 14, 1:22 PM EDT | Wind Advisory | GRR | 57 hr |
| Mar 15, 1:41 PM EDT | Winter Weather Advisory | GRR | 45 hr |
| Mar 16, 7:56 AM EDT | Winter Storm Warning | GRR | 19 hr |
| Mar 31, 1:49 AM EDT | Severe Thunderstorm Warning | GRR | 41 min |
| Mar 31, 11:08 AM EDT | Special Weather Statement | GRR | 52 min |
| Apr 2, 10:16 PM EDT | Special Weather Statement | GRR | 59 min |
| Apr 12, 1:40 PM EDT | Flood Watch | GRR | 4 days |
| Apr 13, 8:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 13, 11:12 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 13, 11:21 PM EDT | Severe Thunderstorm Warning | GRR | 39 min |
| Apr 13, 11:45 PM EDT | Severe Thunderstorm Warning | GRR | 45 min |
| Apr 14, 12:43 AM EDT | Mesoscale Discussion | SPC | 92 min |
| Apr 14, 1:46 AM EDT | Areal Flood Advisory | GRR | 6 hr |
| Apr 14, 2:08 AM EDT | Areal Flood Warning | GRR | 5 hr |
| Apr 14, 8:31 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Apr 14, 8:54 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 17, 2:12 AM EDT | Dense Fog Advisory | GRR | 9 hr |
| Apr 17, 11:33 AM EDT | River Flood Warning | GRR | 72 hr |
| Apr 27, 1:44 PM EDT | Wind Advisory | GRR | 6 hr |
| Apr 30, 12:45 PM EDT | Frost Advisory | GRR | 19 hr |
| Apr 30, 12:45 PM EDT | Freeze Watch | GRR | 23 hr |
| May 1, 12:01 PM EDT | Freeze Warning | GRR | 21 hr |
| May 5, 12:43 PM EDT | Frost Advisory | GRR | 19 hr |
| May 6, 1:57 PM EDT | Freeze Warning | GRR | 18 hr |
| May 7, 12:53 PM EDT | Frost Advisory | GRR | 20 hr |
| May 9, 1:53 AM EDT | Frost Advisory | GRR | 30 hr |
| May 10, 1:10 PM EDT | Freeze Warning | GRR | 19 hr |
| May 11, 1:34 PM EDT | Freeze Warning | GRR | 18 hr |
| May 12, 5:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| May 12, 8:55 PM EDT | Special Weather Statement | GRR | 65 min |
| May 16, 3:43 AM EDT | Special Weather Statement | GRR | 92 min |
| May 17, 3:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 20, 1:33 PM EDT | Frost Advisory | GRR | 19 hr |
| May 24, 9:53 PM EDT | Dense Fog Advisory | GRR | 12 hr |
| May 27, 2:24 PM EDT | Beach Hazards Statement | GRR | 11 hr |
| Jun 4, 3:25 PM EDT | Beach Hazards Statement | GRR | 24 hr |
| Jun 5, 11:04 PM EDT | Special Weather Statement | GRR | 86 min |
| Jun 10, 3:07 AM EDT | Dense Fog Advisory | GRR | 7 hr |
| Jun 10, 4:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 5:41 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 10, 5:49 PM EDT | Severe Thunderstorm Warning | GRR | 56 min |
| Jun 11, 4:18 AM EDT | Beach Hazards Statement | GRR | 32 hr |
| Jun 12, 4:10 PM EDT | Beach Hazards Statement | GRR | 34 hr |
| Jun 15, 9:17 PM EDT | Beach Hazards Statement | GRR | 29 hr |
| Jun 17, 2:15 PM EDT | Beach Hazards Statement | GRR | 28 hr |
| Jun 24, 4:04 AM EDT | Beach Hazards Statement | GRR | 17 hr |
| Jun 28, 2:31 AM EDT | Extreme Heat Watch | GRR | 11 hr |
| Jun 28, 1:26 PM EDT | Extreme Heat Warning | GRR | 4 days |
| Jun 28, 2:22 PM EDT | Beach Hazards Statement | GRR | 54 hr |
| Jun 30, 11:34 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 30, 9:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 9:29 PM EDT | Special Weather Statement | GRR | 61 min |
| Jul 1, 10:11 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 1, 11:17 AM EDT | Severe Thunderstorm Warning | GRR | 58 min |
| Jul 1, 11:53 AM EDT | Severe Thunderstorm Warning | GRR | 39 min |
| Jul 1, 12:05 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 13, 10:35 AM EDT | Heat Advisory | GRR | 57 hr |
| Jul 17, 2:00 PM EDT | Beach Hazards Statement | GRR | 38 hr |
| Jul 20, 2:39 AM EDT | Beach Hazards Statement | GRR | 67 hr |
| Jul 20, 7:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 27, 3:50 AM EDT | Beach Hazards Statement | GRR | 46 hr |
| Jul 27, 12:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 1:29 PM EDT | Severe Thunderstorm Warning | GRR | 36 min |
| Jul 27, 5:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Aug 1, 7:09 PM EDT | Beach Hazards Statement | GRR | 31 hr |
| Aug 18, 5:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 21, 2:25 AM EDT | Beach Hazards Statement | GRR | 18 hr |
| Aug 21, 2:20 PM EDT | Beach Hazards Statement | GRR | 55 hr |
| Aug 25, 1:25 PM EDT | Beach Hazards Statement | GRR | 32 hr |
| Aug 29, 1:30 PM EDT | Beach Hazards Statement | GRR | 33 hr |
| Aug 31, 2:36 AM EDT | Beach Hazards Statement | GRR | 20 hr |
| Sep 2, 6:37 AM EDT | Mesoscale Discussion | SPC | 113 min |
| Sep 3, 8:52 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Sep 3, 11:54 AM EDT | Areal Flood Advisory | GRR | 6 hr |
| Sep 8, 3:14 AM EDT | Beach Hazards Statement | GRR | 41 hr |
| Sep 11, 2:27 PM EDT | Beach Hazards Statement | GRR | 30 hr |
| Sep 12, 1:59 PM EDT | Beach Hazards Statement | GRR | 33 hr |
| Sep 14, 2:49 AM EDT | Beach Hazards Statement | GRR | 44 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive2025
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.