Alert archive / Michigan / Allegan County
Weather alerts in Allegan County, Michigan, 2011
179 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 179
- Warnings
- 23
- Watches
- 27
- Advisories
- 49
- Busiest month
- May30 alerts
- Busiest day
- April 26, 20118 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 warnings covering Allegan County in 2011 had a tornado report inside them; 0 of 2 tornado reports fell inside a warning.
Allegan County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 2 | 0% | |
| Severe thunderstorm warnings | 13 | 7 | 46% | 10 | 70% | 27 min |
| Flash flood warnings | 3 | 1 | 67% | 3 | 0% |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 13 | 1 | 92% | 3 | 33% | 8 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 124 | 64 | 48% | 242 | 62% | 30 min |
| NWS Grand Rapids, MI: flash flood warnings | 21 | 8 | 62% | 27 | 56% | 113 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 3, 4:17 PM EST | Winter Weather Advisory | GRR | 24 hr |
| Jan 5, 4:16 PM EST | Lake Effect Snow Watch | GRR | 19 hr |
| Jan 6, 11:00 AM EST | Lake Effect Snow Warning | GRR | 70 hr |
| Jan 8, 10:29 AM EST | Special Weather Statement | GRR | 106 min |
| Jan 13, 3:06 PM EST | Winter Weather Advisory | GRR | 20 hr |
| Jan 14, 2:05 PM EST | Winter Weather Advisory | GRR | 15 hr |
| Jan 17, 10:28 AM EST | Winter Weather Advisory | GRR | 24 hr |
| Jan 20, 4:12 AM EST | Winter Weather Advisory | GRR | 31 hr |
| Jan 24, 11:17 AM EST | Winter Weather Advisory | GRR | 12 hr |
| Jan 30, 5:38 AM EST | Winter Storm Watch | GRR | 46 hr |
| Feb 1, 3:39 AM EST | Blizzard Warning | GRR | 28 hr |
| Feb 1, 4:36 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 1, 7:28 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 2, 3:33 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 2, 7:19 AM EST | Winter Weather Advisory | GRR | 12 hr |
| Feb 6, 10:55 AM EST | Winter Weather Advisory | GRR | 14 hr |
| Feb 7, 3:32 PM EST | Lake Effect Snow Advisory | GRR | 12 hr |
| Feb 18, 3:44 AM EST | Wind Advisory | GRR | 20 hr |
| Feb 18, 3:54 PM EST | Winter Storm Watch | GRR | 24 hr |
| Feb 19, 4:09 PM EST | Winter Storm Warning | GRR | 48 hr |
| Feb 20, 11:49 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 21, 4:09 PM EST | Winter Weather Advisory | GRR | 12 hr |
| Feb 24, 7:45 AM EST | Special Weather Statement | GRR | 2 hr |
| Feb 26, 2:04 AM EST | Special Weather Statement | GRR | 116 min |
| Feb 26, 5:51 PM EST | Special Weather Statement | GRR | 2 hr |
| Feb 26, 8:04 PM EST | Special Weather Statement | GRR | 4 hr |
| Feb 27, 2:07 AM EST | Special Weather Statement | GRR | 113 min |
| Feb 27, 3:58 PM EST | Winter Weather Advisory | GRR | 17 hr |
| Feb 28, 12:04 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Mar 4, 8:10 AM EST | Special Weather Statement | GRR | 2 hr |
| Mar 4, 2:06 PM EST | Flood Watch | GRR | 13 hr |
| Mar 11, 10:07 AM EST | River Flood Advisory | GRR | 58 hr |
| Mar 20, 7:49 PM EDT | Special Weather Statement | GRR | 41 min |
| Mar 20, 8:39 PM EDT | Areal Flood Advisory | GRR | 14 hr |
| Mar 20, 8:45 PM EDT | Special Weather Statement | GRR | 45 min |
| Mar 23, 4:10 AM EDT | Special Weather Statement | GRR | 2 hr |
| Mar 23, 11:39 AM EDT | River Flood Advisory | GRR | 22 hr |
| Mar 24, 6:58 AM EDT | Special Weather Statement | GRR | 2 hr |
| Apr 3, 1:29 PM EDT | Special Weather Statement | GRR | 91 min |
| Apr 3, 10:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 4, 2:53 AM EDT | Mesoscale Discussion | SPC | 97 min |
| Apr 11, 12:03 AM EDT | Mesoscale Discussion | SPC | 87 min |
| Apr 11, 2:35 AM EDT | Special Weather Statement | GRR | 115 min |
| Apr 16, 4:34 PM EDT | Wind Advisory | GRR | 25 hr |
| Apr 17, 3:59 PM EDT | Winter Weather Advisory | GRR | 20 hr |
| Apr 19, 8:09 PM EDT | Special Weather Statement | GRR | 51 min |
| Apr 19, 9:08 PM EDT | Special Weather Statement | GRR | 52 min |
| Apr 19, 10:11 PM EDT | Special Weather Statement | GRR | 49 min |
| Apr 19, 10:24 PM EDT | Severe Thunderstorm Warning | GRR | 66 min |
| Apr 22, 9:07 PM EDT | Special Weather Statement | GRR | 38 min |
| Apr 22, 11:14 PM EDT | Special Weather Statement | GRR | 61 min |
| Apr 26, 3:02 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 26, 3:21 PM EDT | Flood Watch | GRR | 44 hr |
| Apr 26, 4:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Apr 26, 5:28 PM EDT | River Flood Advisory | GRR | 6 days |
| Apr 26, 5:34 PM EDT | Severe Thunderstorm Warning | GRR | 41 min |
| Apr 26, 5:48 PM EDT | Areal Flood Advisory | GRR | 12 hr |
| Apr 26, 6:43 PM EDT | Severe Thunderstorm Warning | GRR | 47 min |
| Apr 26, 6:59 PM EDT | Severe Thunderstorm Warning | GRR | 46 min |
| Apr 27, 5:17 AM EDT | Special Weather Statement | GRR | 43 min |
| Apr 27, 2:39 PM EDT | Areal Flood Advisory | GRR | 4 days |
| May 4, 2:25 PM EDT | Frost Advisory | GRR | 18 hr |
| May 9, 7:16 PM EDT | Special Weather Statement | GRR | 59 min |
| May 11, 6:40 PM EDT | Mesoscale Discussion | SPC | 65 min |
| May 11, 6:56 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 11, 9:30 PM EDT | Special Weather Statement | GRR | 90 min |
| May 11, 10:30 PM EDT | Severe Thunderstorm Warning | GRR | 39 min |
| May 11, 11:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 12, 5:41 PM EDT | Severe Thunderstorm Warning | GRR | 33 min |
| May 12, 6:25 PM EDT | Areal Flood Advisory | GRR | 3 hr |
| May 13, 6:59 PM EDT | Special Weather Statement | GRR | 61 min |
| May 19, 9:58 PM EDT | Dense Fog Advisory | GRR | 14 hr |
| May 22, 5:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| May 22, 5:32 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 22, 7:16 PM EDT | Severe Thunderstorm Warning | GRR | 59 min |
| May 22, 8:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 22, 10:59 PM EDT | Mesoscale Discussion | SPC | 61 min |
| May 25, 9:06 AM EDT | Flood Watch | GRR | 33 hr |
| May 25, 11:39 AM EDT | Areal Flood Advisory | GRR | 72 hr |
| May 26, 11:05 AM EDT | River Flood Advisory | GRR | 9 days |
| May 29, 9:39 AM EDT | Mesoscale Discussion | SPC | 66 min |
| May 29, 11:12 AM EDT | Flood Watch | GRR | 11 hr |
| May 29, 12:59 PM EDT | Mesoscale Discussion | SPC | 61 min |
| May 29, 1:29 PM EDT | Tornado Watch | SPC | 7 hr |
| May 29, 1:39 PM EDT | Special Weather Statement | GRR | 51 min |
| May 29, 2:25 PM EDT | Special Weather Statement | GRR | 80 min |
| May 29, 2:38 PM EDT | Flash Flood Warning | GRR | 5 hr |
| May 29, 3:14 PM EDT | Special Weather Statement | GRR | 61 min |
| May 31, 1:59 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 31, 3:33 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 31, 7:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 8, 12:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 8, 9:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 8, 10:39 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 8, 11:30 PM EDT | Severe Thunderstorm Warning | GRR | 48 min |
| Jun 9, 12:45 AM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 21, 4:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 21, 4:57 PM EDT | Tornado Watch | SPC | 7 hr |
| Jun 21, 5:59 PM EDT | Severe Thunderstorm Warning | GRR | 61 min |
| Jun 21, 6:14 PM EDT | Areal Flood Advisory | GRR | 6 hr |
| Jun 21, 6:26 PM EDT | Tornado Warning | GRR | 34 min |
| Jun 21, 6:59 PM EDT | Severe Thunderstorm Warning | GRR | 46 min |
| Jun 21, 10:51 PM EDT | Areal Flood Advisory | GRR | 12 hr |
| Jun 30, 5:00 PM EDT | Flash Flood Watch | GRR | 23 hr |
| Jul 1, 12:48 PM EDT | Areal Flood Advisory | GRR | 4 hr |
| Jul 1, 2:24 PM EDT | Special Weather Statement | GRR | 51 min |
| Jul 1, 3:39 PM EDT | Special Weather Statement | GRR | 51 min |
| Jul 2, 2:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 2, 2:24 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 11, 6:37 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 11, 8:10 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 11, 8:48 AM EDT | Severe Thunderstorm Warning | GRR | 44 min |
| Jul 11, 8:50 AM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 11, 9:09 AM EDT | Areal Flood Advisory | GRR | 5 hr |
| Jul 11, 9:46 AM EDT | Severe Thunderstorm Warning | GRR | 73 min |
| Jul 11, 10:53 AM EDT | Coastal Flood Warning | GRR | 9 hr |
| Jul 11, 10:55 AM EDT | Mesoscale Discussion | SPC | 65 min |
| Jul 18, 2:06 AM EDT | Special Weather Statement | GRR | 114 min |
| Jul 18, 3:13 AM EDT | Special Weather Statement | GRR | 2 hr |
| Jul 18, 3:55 AM EDT | Special Weather Statement | GRR | 65 min |
| Jul 18, 10:59 AM EDT | Heat Advisory | GRR | 9 hr |
| Jul 18, 4:07 PM EDT | Excessive Heat Watch | GRR | 12 hr |
| Jul 19, 4:00 AM EDT | Excessive Heat Warning | GRR | 65 hr |
| Jul 22, 9:32 AM EDT | Special Weather Statement | GRR | 58 min |
| Jul 22, 10:41 AM EDT | Flash Flood Watch | GRR | 5 hr |
| Jul 27, 8:46 PM EDT | Flash Flood Watch | GRR | 32 hr |
| Jul 29, 12:26 AM EDT | Special Weather Statement | GRR | 94 min |
| Jul 29, 12:44 AM EDT | Flash Flood Warning | GRR | 8 hr |
| Jul 29, 12:51 AM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 29, 10:34 AM EDT | River Flood Advisory | GRR | 36 hr |
| Aug 2, 11:26 AM EDT | Flash Flood Watch | GRR | 15 hr |
| Aug 2, 2:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 2, 6:22 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 2, 11:36 PM EDT | Special Weather Statement | GRR | 54 min |
| Aug 7, 3:53 AM EDT | Dense Fog Advisory | GRR | 5 hr |
| Aug 9, 5:10 AM EDT | Dense Fog Advisory | GRR | 4 hr |
| Aug 13, 9:31 AM EDT | Special Weather Statement | GRR | 59 min |
| Aug 13, 9:52 AM EDT | Flash Flood Warning | GRR | 7 hr |
| Aug 13, 10:37 AM EDT | Special Weather Statement | GRR | 53 min |
| Aug 13, 12:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Aug 13, 1:12 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 13, 2:53 PM EDT | Special Weather Statement | GRR | 82 min |
| Aug 13, 4:08 PM EDT | Special Weather Statement | GRR | 82 min |
| Aug 18, 1:00 AM EDT | Special Weather Statement | GRR | 75 min |
| Aug 18, 3:34 AM EDT | Special Weather Statement | GRR | 71 min |
| Aug 20, 1:21 PM EDT | Severe Thunderstorm Warning | GRR | 39 min |
| Aug 20, 1:41 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 24, 5:21 PM EDT | Special Weather Statement | GRR | 54 min |
| Aug 24, 6:00 PM EDT | Tornado Watch | SPC | 5 hr |
| Aug 24, 8:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 2, 4:20 AM EDT | Heat Advisory | GRR | 13 hr |
| Sep 3, 7:22 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 3, 1:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Sep 15, 4:15 AM EDT | Frost Advisory | GRR | 29 hr |
| Sep 19, 10:39 PM EDT | Dense Fog Advisory | GRR | 11 hr |
| Sep 29, 4:13 AM EDT | Wind Advisory | GRR | 34 hr |
| Sep 29, 4:35 AM EDT | Dense Fog Advisory | GRR | 4 hr |
| Sep 29, 6:01 PM EDT | Special Weather Statement | GRR | 59 min |
| Sep 29, 6:21 PM EDT | Special Weather Statement | GRR | 39 min |
| Sep 29, 6:55 PM EDT | Special Weather Statement | GRR | 65 min |
| Oct 1, 4:15 AM EDT | Frost Advisory | GRR | 29 hr |
| Oct 15, 3:44 AM EDT | Wind Advisory | GRR | 14 hr |
| Oct 19, 4:20 AM EDT | Wind Advisory | GRR | 33 hr |
| Oct 19, 2:23 PM EDT | Areal Flood Advisory | GRR | 24 hr |
| Oct 21, 2:42 PM EDT | Frost Advisory | GRR | 8 hr |
| Oct 21, 2:42 PM EDT | Freeze Warning | GRR | 19 hr |
| Oct 24, 12:03 AM EDT | Special Weather Statement | GRR | 57 min |
| Oct 25, 6:14 PM EDT | Special Weather Statement | GRR | 61 min |
| Oct 28, 8:39 AM EDT | Special Weather Statement | GRR | 81 min |
| Nov 9, 3:48 AM EST | Wind Advisory | GRR | 16 hr |
| Nov 9, 11:26 AM EST | Special Weather Statement | GRR | 109 min |
| Nov 17, 3:19 PM EST | Wind Advisory | GRR | 31 hr |
| Nov 28, 3:59 PM EST | Flood Watch | GRR | 24 hr |
| Dec 15, 11:44 AM EST | Wind Advisory | GRR | 11 hr |
| Dec 17, 10:20 PM EST | Winter Weather Advisory | GRR | 6 hr |
| Dec 21, 4:42 AM EST | Dense Fog Advisory | GRR | 6 hr |
| Dec 27, 10:11 AM EST | Special Weather Statement | GRR | 49 min |
| Dec 27, 10:19 AM EST | Special Weather Statement | GRR | 41 min |
| Dec 29, 7:57 AM EST | Winter Weather Advisory | GRR | 5 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 archive20102012
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.