Alert archive / Michigan / Ottawa County
Weather alerts in Ottawa County, Michigan, 2015
115 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Ottawa County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 115
- Warnings
- 18
- Watches
- 13
- Advisories
- 37
- Busiest month
- August17 alerts
- Busiest day
- July 18, 20156 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Ottawa County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 4 | 43% | 7 | 14% | 3 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 2 | 0 | 100% | 2 | 0% | |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 62 | 33 | 47% | 90 | 66% | 26 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, 3:18 PM EST | Winter Weather Advisory | GRR | 4 days |
| Jan 4, 3:47 PM EST | Winter Storm Watch | GRR | 12 hr |
| Jan 6, 11:55 AM EST | Winter Weather Advisory | GRR | 27 hr |
| Jan 7, 3:53 PM EST | Winter Storm Warning | GRR | 48 hr |
| Jan 21, 4:29 AM EST | Winter Weather Advisory | GRR | 6 hr |
| Jan 28, 3:45 AM EST | Winter Weather Advisory | GRR | 35 hr |
| Jan 31, 3:10 AM EST | Winter Weather Advisory | GRR | 48 hr |
| Jan 31, 3:22 PM EST | Winter Storm Warning | GRR | 36 hr |
| Feb 3, 2:37 PM EST | Winter Weather Advisory | GRR | 19 hr |
| Feb 11, 3:48 AM EST | Winter Weather Advisory | GRR | 39 hr |
| Feb 13, 3:45 AM EST | Winter Storm Watch | GRR | 8 hr |
| Feb 13, 11:47 AM EST | Winter Storm Warning | GRR | 39 hr |
| Feb 14, 7:45 PM EST | Wind Chill Warning | GRR | 16 hr |
| Feb 15, 11:36 AM EST | Wind Chill Advisory | GRR | 22 hr |
| Feb 17, 9:37 PM EST | Winter Weather Advisory | GRR | 45 hr |
| Feb 18, 12:28 PM EST | Wind Chill Advisory | GRR | 46 hr |
| Feb 22, 3:11 AM EST | Wind Chill Advisory | GRR | 32 hr |
| Feb 23, 3:22 PM EST | Winter Weather Advisory | GRR | 32 hr |
| Mar 2, 3:57 PM EST | Winter Weather Advisory | GRR | 27 hr |
| Mar 11, 8:44 AM EDT | Dense Fog Advisory | GRR | 2 hr |
| Apr 9, 4:01 AM EDT | Special Weather Statement | GRR | 89 min |
| Apr 9, 2:37 PM EDT | Areal Flood Advisory | GRR | 45 hr |
| Apr 9, 3:55 PM EDT | Wind Advisory | GRR | 23 hr |
| Apr 9, 9:27 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 9, 9:55 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 9, 11:09 PM EDT | Severe Thunderstorm Warning | GRR | 51 min |
| Apr 10, 5:17 PM EDT | Special Weather Statement | GRR | 118 min |
| Apr 22, 3:31 PM EDT | Freeze Warning | GRR | 17 hr |
| Apr 23, 3:27 PM EDT | Freeze Warning | GRR | 18 hr |
| Apr 27, 3:42 PM EDT | Frost Advisory | GRR | 17 hr |
| May 11, 6:30 AM EDT | Dense Fog Advisory | GRR | 4 hr |
| May 13, 3:21 PM EDT | Frost Advisory | GRR | 17 hr |
| May 19, 3:39 PM EDT | Frost Advisory | GRR | 16 hr |
| May 24, 3:42 PM EDT | Beach Hazards Statement | GRR | 40 hr |
| May 26, 12:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 26, 3:01 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 26, 3:57 PM EDT | Special Weather Statement | GRR | 63 min |
| May 27, 12:50 AM EDT | Beach Hazards Statement | GRR | 10 hr |
| May 30, 4:19 AM EDT | Beach Hazards Statement | GRR | 35 hr |
| Jun 7, 4:54 AM EDT | Beach Hazards Statement | GRR | 18 hr |
| Jun 10, 4:13 AM EDT | Beach Hazards Statement | GRR | 8 hr |
| Jun 15, 6:24 AM EDT | Dense Fog Advisory | GRR | 3 hr |
| Jun 18, 3:05 AM EDT | Dense Fog Advisory | GRR | 5 hr |
| Jun 21, 10:32 PM EDT | Beach Hazards Statement | GRR | 33 hr |
| Jun 22, 12:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 1:23 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 22, 1:40 PM EDT | Special Weather Statement | GRR | 50 min |
| Jun 23, 11:36 AM EDT | Beach Hazards Statement | GRR | 5 hr |
| Jul 5, 3:59 PM EDT | Beach Hazards Statement | GRR | 60 hr |
| Jul 13, 7:16 AM EDT | Special Weather Statement | GRR | 89 min |
| Jul 13, 7:58 AM EDT | Severe Thunderstorm Warning | GRR | 62 min |
| Jul 13, 11:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 14, 12:38 AM EDT | Severe Thunderstorm Warning | GRR | 32 min |
| Jul 14, 3:30 AM EDT | Beach Hazards Statement | GRR | 31 hr |
| Jul 16, 3:38 AM EDT | Beach Hazards Statement | GRR | 31 hr |
| Jul 17, 3:20 PM EDT | Heat Advisory | GRR | 22 hr |
| Jul 18, 8:14 AM EDT | Special Weather Statement | GRR | 2 hr |
| Jul 18, 9:07 AM EDT | Severe Thunderstorm Warning | GRR | 38 min |
| Jul 18, 4:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 18, 4:59 PM EDT | Tornado Watch | SPC | 5 hr |
| Jul 18, 5:35 PM EDT | Special Weather Statement | GRR | 55 min |
| Jul 18, 6:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 30, 7:44 AM EDT | Beach Hazards Statement | GRR | 8 hr |
| Jul 31, 7:59 AM EDT | Beach Hazards Statement | GRR | 10 hr |
| Aug 1, 3:16 PM EDT | Beach Hazards Statement | GRR | 40 hr |
| Aug 2, 3:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 3:59 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 2, 6:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Aug 2, 6:27 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 2, 7:15 PM EDT | Special Weather Statement | GRR | 2 hr |
| Aug 2, 8:05 PM EDT | Severe Thunderstorm Warning | GRR | 55 min |
| Aug 2, 9:00 PM EDT | Severe Thunderstorm Warning | GRR | 90 min |
| Aug 2, 9:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Aug 10, 8:24 PM EDT | Beach Hazards Statement | GRR | 28 hr |
| Aug 13, 3:44 AM EDT | Beach Hazards Statement | GRR | 24 hr |
| Aug 18, 10:56 AM EDT | Beach Hazards Statement | GRR | 65 hr |
| Aug 19, 12:15 AM EDT | Special Weather Statement | GRR | 60 min |
| Aug 22, 3:50 PM EDT | Beach Hazards Statement | GRR | 3 days |
| Aug 23, 11:14 AM EDT | Special Weather Statement | GRR | 61 min |
| Aug 23, 11:55 AM EDT | Special Weather Statement | GRR | 2 hr |
| Aug 31, 1:16 AM EDT | Dense Fog Advisory | GRR | 9 hr |
| Sep 3, 12:54 AM EDT | Special Weather Statement | GRR | 66 min |
| Sep 3, 1:16 AM EDT | Severe Thunderstorm Warning | GRR | 30 min |
| Sep 5, 2:57 AM EDT | Dense Fog Advisory | GRR | 9 hr |
| Sep 8, 2:44 PM EDT | Special Weather Statement | GRR | 31 min |
| Sep 8, 3:11 PM EDT | Areal Flood Advisory | GRR | 12 hr |
| Sep 10, 3:52 PM EDT | Beach Hazards Statement | GRR | 56 hr |
| Sep 13, 3:53 AM EDT | Beach Hazards Statement | GRR | 5 days |
| Sep 18, 3:45 PM EDT | Beach Hazards Statement | GRR | 30 hr |
| Sep 18, 10:14 PM EDT | Areal Flood Advisory | GRR | 3 hr |
| Oct 15, 3:42 PM EDT | Freeze Watch | GRR | 23 hr |
| Oct 16, 10:44 AM EDT | Freeze Watch | GRR | 28 hr |
| Oct 16, 2:59 PM EDT | Freeze Warning | GRR | 19 hr |
| Oct 17, 2:30 PM EDT | Freeze Warning | GRR | 19 hr |
| Oct 28, 9:33 PM EDT | Special Weather Statement | GRR | 117 min |
| Nov 11, 3:58 AM EST | Lakeshore Flood Warning | GRR | 36 hr |
| Nov 11, 4:49 AM EST | High Wind Watch | GRR | 11 hr |
| Nov 11, 3:26 PM EST | High Wind Warning | GRR | 24 hr |
| Nov 11, 3:26 PM EST | Wind Advisory | GRR | 36 hr |
| Nov 11, 10:07 PM EST | Special Weather Statement | GRR | 83 min |
| Nov 11, 11:28 PM EST | Special Weather Statement | GRR | 107 min |
| Nov 12, 4:04 PM EST | Lakeshore Flood Advisory | GRR | 28 hr |
| Nov 18, 6:09 AM EST | Special Weather Statement | GRR | 66 min |
| Nov 19, 3:08 AM EST | Wind Advisory | GRR | 21 hr |
| Nov 20, 3:52 AM EST | Winter Storm Watch | GRR | 12 hr |
| Nov 20, 3:34 PM EST | Winter Weather Advisory | GRR | 36 hr |
| Nov 22, 2:50 PM EST | Winter Weather Advisory | GRR | 22 hr |
| Dec 5, 12:09 AM EST | Freezing Fog Advisory | GRR | 12 hr |
| Dec 6, 9:53 PM EST | Dense Fog Advisory | GRR | 12 hr |
| Dec 12, 4:44 PM EST | Dense Fog Advisory | GRR | 11 hr |
| Dec 17, 3:15 PM EST | Winter Weather Advisory | GRR | 35 hr |
| Dec 23, 3:53 AM EST | Wind Advisory | GRR | 30 hr |
| Dec 27, 3:42 AM EST | Winter Storm Watch | GRR | 12 hr |
| Dec 27, 3:53 PM EST | Winter Storm Warning | GRR | 35 hr |
| Dec 28, 7:00 PM EST | Mesoscale Discussion | SPC | 5 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 | 7 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 10 |
| Special Weather Statement | 17 |
| Flooding | |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 13 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 4 |
| Wind Chill Warning | 1 |
| Freeze Watch | 2 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
| Freezing Fog Advisory | 1 |
| Coast and beach | |
| Lakeshore Flood Warning | 1 |
| Lakeshore Flood Advisory | 1 |
| Beach Hazards Statement | 20 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20142016
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.