Alert archive / Michigan / Allegan County
Weather alerts in Allegan County, Michigan, 2021
123 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Allegan County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 123
- Warnings
- 19
- Watches
- 15
- Advisories
- 36
- Busiest month
- June26 alerts
- Busiest day
- June 26, 20217 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado reports fell inside a warning.
Allegan County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 1 | 0% | |||
| Severe thunderstorm warnings | 12 | 9 | 25% | 18 | 78% | 24 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 14 | 0 | 100% | 8 | 0% | |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 100 | 54 | 46% | 209 | 75% | 23 min |
| NWS Grand Rapids, MI: flash flood warnings | 1 | 0 | 100% | 2 | 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 11, 3:06 PM EST | Winter Weather Advisory | GRR | 24 hr |
| Jan 19, 3:27 AM EST | Winter Weather Advisory | GRR | 24 hr |
| Jan 24, 2:21 PM EST | Winter Weather Advisory | GRR | 49 hr |
| Jan 29, 3:54 PM EST | Winter Weather Advisory | GRR | 43 hr |
| Feb 3, 3:38 PM EST | Winter Weather Advisory | GRR | 4 days |
| Feb 4, 11:59 AM EST | Winter Storm Warning | GRR | 27 hr |
| Feb 8, 3:49 AM EST | Winter Weather Advisory | GRR | 32 hr |
| Feb 14, 3:16 PM EST | Winter Weather Advisory | GRR | 45 hr |
| Feb 15, 3:52 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 19, 3:39 AM EST | Winter Weather Advisory | GRR | 29 hr |
| Mar 10, 3:37 AM EST | Wind Advisory | GRR | 38 hr |
| Mar 15, 11:22 AM EDT | Winter Weather Advisory | GRR | 21 hr |
| Mar 18, 3:23 AM EDT | Wind Advisory | GRR | 17 hr |
| Apr 5, 8:39 AM EDT | Special Weather Statement | GRR | 111 min |
| Apr 5, 10:56 AM EDT | Special Weather Statement | GRR | 2 hr |
| Apr 10, 3:25 PM EDT | Special Weather Statement | GRR | 65 min |
| Apr 19, 3:42 AM EDT | Freeze Watch | GRR | 12 hr |
| Apr 19, 3:30 PM EDT | Freeze Warning | GRR | 66 hr |
| Apr 29, 6:46 PM EDT | Special Weather Statement | GRR | 119 min |
| May 1, 3:00 AM EDT | Wind Advisory | GRR | 17 hr |
| May 1, 8:44 PM EDT | Special Weather Statement | GRR | 2 hr |
| May 1, 10:11 PM EDT | Special Weather Statement | GRR | 64 min |
| May 7, 5:58 AM EDT | Dense Fog Advisory | GRR | 3 hr |
| May 7, 3:51 PM EDT | Frost Advisory | GRR | 17 hr |
| May 9, 3:46 PM EDT | Frost Advisory | GRR | 17 hr |
| May 10, 10:10 AM EDT | Freeze Warning | GRR | 22 hr |
| May 11, 11:13 AM EDT | Freeze Warning | GRR | 21 hr |
| May 12, 1:38 PM EDT | Frost Advisory | GRR | 18 hr |
| May 13, 12:00 PM EDT | Frost Advisory | GRR | 19 hr |
| May 26, 3:31 AM EDT | Special Weather Statement | GRR | 89 min |
| May 29, 10:20 AM EDT | Frost Advisory | GRR | 22 hr |
| Jun 7, 3:24 PM EDT | Areal Flood Advisory | GRR | 6 hr |
| Jun 14, 4:50 AM EDT | Beach Hazards Statement | GRR | 14 hr |
| Jun 15, 3:57 AM EDT | Beach Hazards Statement | GRR | 18 hr |
| Jun 17, 9:12 AM EDT | Red Flag Warning | GRR | 11 hr |
| Jun 18, 4:44 AM EDT | Special Weather Statement | GRR | 4 hr |
| Jun 18, 5:45 AM EDT | Severe Thunderstorm Warning | GRR | 45 min |
| Jun 20, 4:52 AM EDT | Beach Hazards Statement | GRR | 45 hr |
| Jun 20, 6:06 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 20, 7:56 PM EDT | Severe Thunderstorm Warning | GRR | 64 min |
| Jun 20, 10:39 PM EDT | Areal Flood Advisory | GRR | 6 hr |
| Jun 20, 11:51 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jun 21, 1:00 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 21, 2:14 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 3:41 PM EDT | Beach Hazards Statement | GRR | 60 hr |
| Jun 24, 2:54 PM EDT | Areal Flood Advisory | GRR | 6 hr |
| Jun 25, 1:47 PM EDT | Areal Flood Advisory | GRR | 6 hr |
| Jun 25, 2:56 PM EDT | Flood Watch | GRR | 29 hr |
| Jun 26, 11:37 AM EDT | Areal Flood Advisory | GRR | 4 hr |
| Jun 26, 1:05 PM EDT | Tornado Watch | SPC | 9 hr |
| Jun 26, 1:48 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jun 26, 3:10 PM EDT | Areal Flood Warning | GRR | 43 hr |
| Jun 26, 3:25 PM EDT | Severe Thunderstorm Warning | GRR | 57 min |
| Jun 26, 3:49 PM EDT | Beach Hazards Statement | GRR | 24 hr |
| Jun 26, 7:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jun 28, 7:46 PM EDT | Severe Thunderstorm Warning | GRR | 44 min |
| Jun 30, 3:14 PM EDT | Beach Hazards Statement | GRR | 37 hr |
| Jul 7, 12:13 PM EDT | Special Weather Statement | GRR | 4 hr |
| Jul 7, 11:28 PM EDT | Special Weather Statement | GRR | 62 min |
| Jul 8, 3:57 AM EDT | Beach Hazards Statement | GRR | 23 hr |
| Jul 14, 3:17 AM EDT | Beach Hazards Statement | GRR | 39 hr |
| Jul 19, 4:00 PM EDT | Beach Hazards Statement | GRR | 35 hr |
| Jul 24, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 24, 5:50 PM EDT | Severe Thunderstorm Warning | GRR | 55 min |
| Jul 24, 6:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 28, 11:06 AM EDT | Beach Hazards Statement | GRR | 55 hr |
| Jul 29, 1:32 AM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 29, 2:00 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 29, 4:05 AM EDT | Severe Thunderstorm Warning | GRR | 55 min |
| Jul 29, 4:18 AM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 29, 4:47 AM EDT | Severe Thunderstorm Warning | GRR | 58 min |
| Jul 31, 4:21 AM EDT | Beach Hazards Statement | GRR | 48 hr |
| Aug 6, 2:43 PM EDT | Special Weather Statement | GRR | 62 min |
| Aug 6, 4:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Aug 9, 11:41 PM EDT | Special Weather Statement | GRR | 3 hr |
| Aug 10, 3:06 PM EDT | Beach Hazards Statement | GRR | 36 hr |
| Aug 10, 8:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Aug 10, 8:38 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 9:22 PM EDT | Special Weather Statement | GRR | 3 hr |
| Aug 10, 9:40 PM EDT | Severe Thunderstorm Warning | GRR | 73 min |
| Aug 11, 11:50 AM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 11, 12:51 PM EDT | Severe Thunderstorm Warning | GRR | 28 min |
| Aug 11, 7:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Aug 11, 8:19 PM EDT | Severe Thunderstorm Warning | GRR | 72 min |
| Aug 11, 8:56 PM EDT | Severe Thunderstorm Warning | GRR | 49 min |
| Aug 11, 9:22 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 12, 12:01 AM EDT | Special Weather Statement | GRR | 59 min |
| Aug 12, 12:06 AM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 21, 8:59 AM EDT | Beach Hazards Statement | GRR | 38 hr |
| Aug 25, 3:38 AM EDT | Heat Advisory | GRR | 16 hr |
| Aug 27, 3:22 PM EDT | Heat Advisory | GRR | 29 hr |
| Aug 28, 10:40 AM EDT | Beach Hazards Statement | GRR | 35 hr |
| Aug 29, 4:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 1, 11:39 AM EDT | Beach Hazards Statement | GRR | 15 hr |
| Sep 3, 3:56 PM EDT | Beach Hazards Statement | GRR | 64 hr |
| Sep 6, 3:50 PM EDT | Beach Hazards Statement | GRR | 64 hr |
| Sep 7, 3:20 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 7, 4:49 PM EDT | Severe Thunderstorm Warning | GRR | 42 min |
| Sep 7, 5:37 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Sep 10, 3:53 AM EDT | Beach Hazards Statement | GRR | 41 hr |
| Sep 12, 6:03 AM EDT | Beach Hazards Statement | GRR | 10 hr |
| Sep 12, 5:15 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Sep 13, 3:08 AM EDT | Beach Hazards Statement | GRR | 50 hr |
| Sep 14, 3:08 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 19, 4:02 PM EDT | Beach Hazards Statement | GRR | 8 days |
| Oct 11, 5:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Oct 11, 7:36 PM EDT | Special Weather Statement | GRR | 39 min |
| Oct 25, 1:41 AM EDT | Special Weather Statement | GRR | 64 min |
| Nov 21, 10:32 AM EST | Wind Advisory | GRR | 11 hr |
| Nov 27, 3:19 AM EST | Winter Weather Advisory | GRR | 19 hr |
| Nov 29, 11:23 AM EST | Winter Weather Advisory | GRR | 16 hr |
| Nov 29, 4:46 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 6, 4:02 AM EST | Winter Weather Advisory | GRR | 18 hr |
| Dec 7, 3:40 AM EST | Winter Weather Advisory | GRR | 37 hr |
| Dec 9, 3:27 PM EST | High Wind Watch | GRR | 24 hr |
| Dec 10, 2:58 PM EST | Wind Advisory | GRR | 28 hr |
| Dec 11, 6:32 AM EST | High Wind Warning | GRR | 5 hr |
| Dec 11, 6:32 AM EST | Wind Advisory | GRR | 12 hr |
| Dec 14, 3:55 PM EST | High Wind Watch | GRR | 11 hr |
| Dec 15, 2:58 AM EST | Lakeshore Flood Advisory | GRR | 31 hr |
| Dec 15, 3:02 AM EST | Wind Advisory | GRR | 41 hr |
| Dec 26, 9:44 PM EST | Winter Weather Advisory | GRR | 11 hr |
| Dec 30, 6:28 PM EST | Dense Fog Advisory | GRR | 9 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 | 12 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 16 |
| Special Weather Statement | 16 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flood Watch | 1 |
| Areal Flood Advisory | 5 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Weather Advisory | 14 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 1 |
| Frost Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 2 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
| Coast and beach | |
| Lakeshore Flood Advisory | 1 |
| Beach Hazards Statement | 21 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.