Alert archive / Michigan / Ionia County
Weather alerts in Ionia County, Michigan, 2018
93 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Ionia County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 93
- Warnings
- 10
- Watches
- 9
- Advisories
- 46
- Busiest month
- February19 alerts
- Busiest day
- August 2, 20184 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Ionia County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 2 | 0% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 3 | 1 | 67% | 6 | 17% | 12 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 58 | 35 | 40% | 112 | 71% | 22 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, 3:20 PM EST | Wind Chill Advisory | GRR | 15 hr |
| Jan 4, 6:10 AM EST | Wind Chill Advisory | GRR | 29 hr |
| Jan 5, 3:54 PM EST | Wind Chill Advisory | GRR | 15 hr |
| Jan 7, 12:20 PM EST | Winter Weather Advisory | GRR | 21 hr |
| Jan 10, 4:57 PM EST | Dense Fog Advisory | GRR | 11 hr |
| Jan 11, 11:07 AM EST | River Flood Advisory | GRR | 7 days |
| Jan 11, 3:26 PM EST | Winter Weather Advisory | GRR | 22 hr |
| Jan 12, 3:04 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 14, 3:26 PM EST | Winter Weather Advisory | GRR | 40 hr |
| Jan 21, 9:03 PM EST | River Flood Advisory | GRR | 7 days |
| Jan 22, 11:14 PM EST | Special Weather Statement | GRR | 61 min |
| Feb 2, 3:03 PM EST | Winter Weather Advisory | GRR | 52 hr |
| Feb 4, 10:17 PM EST | Winter Weather Advisory | GRR | 29 hr |
| Feb 5, 2:19 PM EST | River Flood Advisory | GRR | 6 days |
| Feb 6, 2:56 PM EST | Winter Weather Advisory | GRR | 25 hr |
| Feb 8, 3:42 AM EST | Winter Weather Advisory | GRR | 39 hr |
| Feb 9, 12:01 PM EST | River Flood Advisory | GRR | 46 hr |
| Feb 10, 2:45 PM EST | Winter Weather Advisory | GRR | 24 hr |
| Feb 14, 8:00 PM EST | Dense Fog Advisory | GRR | 12 hr |
| Feb 15, 11:35 AM EST | Dense Fog Advisory | GRR | 6 hr |
| Feb 18, 1:18 PM EST | River Flood Advisory | GRR | 24 hr |
| Feb 18, 1:18 PM EST | River Flood Advisory | GRR | 10 days |
| Feb 18, 3:02 PM EST | Flood Watch | GRR | 45 hr |
| Feb 18, 9:49 PM EST | River Flood Warning | GRR | 9 days |
| Feb 18, 10:21 PM EST | River Flood Advisory | GRR | 24 hr |
| Feb 19, 12:53 PM EST | River Flood Warning | GRR | 7 days |
| Feb 20, 6:23 AM EST | Areal Flood Warning | GRR | 55 hr |
| Feb 25, 1:34 AM EST | Wind Advisory | GRR | 12 hr |
| Feb 25, 11:05 AM EST | River Flood Advisory | GRR | 36 hr |
| Feb 28, 2:55 PM EST | Winter Weather Advisory | GRR | 30 hr |
| Mar 7, 2:59 AM EST | Winter Weather Advisory | GRR | 9 hr |
| Mar 30, 2:53 PM EDT | Wind Advisory | GRR | 28 hr |
| Apr 2, 3:39 PM EDT | Winter Weather Advisory | GRR | 43 hr |
| Apr 3, 2:53 PM EDT | Special Weather Statement | GRR | 67 min |
| Apr 5, 2:45 AM EDT | Winter Weather Advisory | GRR | 31 hr |
| Apr 12, 3:24 AM EDT | Winter Storm Watch | GRR | 36 hr |
| Apr 13, 3:31 PM EDT | Winter Storm Warning | GRR | 54 hr |
| Apr 13, 9:39 PM EDT | River Flood Advisory | GRR | 13 days |
| Apr 15, 12:14 AM EDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 18, 3:22 PM EDT | Winter Weather Advisory | GRR | 12 hr |
| Apr 30, 12:28 PM EDT | Fire Weather Watch | GRR | 8 hr |
| Apr 30, 3:00 PM EDT | Red Flag Warning | GRR | 29 hr |
| May 3, 12:15 AM EDT | Special Weather Statement | GRR | 60 min |
| May 3, 4:08 PM EDT | Wind Advisory | GRR | 24 hr |
| May 4, 10:17 AM EDT | High Wind Warning | GRR | 6 hr |
| May 11, 12:43 PM EDT | River Flood Advisory | GRR | 7 days |
| May 13, 5:15 PM EDT | River Flood Advisory | GRR | 12 days |
| May 30, 4:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 16, 2:31 PM EDT | Heat Advisory | GRR | 29 hr |
| Jun 27, 3:54 PM EDT | Excessive Heat Watch | GRR | 34 hr |
| Jun 29, 2:23 AM EDT | Excessive Heat Warning | GRR | 66 hr |
| Jul 1, 6:35 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 1, 9:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 1, 9:16 PM EDT | Special Weather Statement | GRR | 59 min |
| Jul 4, 3:17 AM EDT | Heat Advisory | GRR | 17 hr |
| Jul 16, 1:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 7:35 AM EDT | Special Weather Statement | GRR | 25 min |
| Jul 20, 8:26 AM EDT | Special Weather Statement | GRR | 34 min |
| Jul 20, 8:36 AM EDT | Special Weather Statement | GRR | 24 min |
| Aug 2, 4:39 PM EDT | Special Weather Statement | GRR | 3 hr |
| Aug 2, 5:39 PM EDT | Severe Thunderstorm Warning | GRR | 37 min |
| Aug 2, 7:30 PM EDT | Special Weather Statement | GRR | 60 min |
| Aug 2, 7:59 PM EDT | Special Weather Statement | GRR | 61 min |
| Aug 19, 7:09 AM EDT | Special Weather Statement | GRR | 111 min |
| Aug 26, 10:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Aug 26, 11:05 PM EDT | Special Weather Statement | GRR | 115 min |
| Aug 28, 10:59 AM EDT | Flood Watch | GRR | 16 hr |
| Aug 28, 6:23 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 28, 8:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Sep 1, 12:43 PM EDT | Flood Watch | GRR | 18 hr |
| Sep 1, 6:57 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Sep 2, 6:05 AM EDT | Special Weather Statement | GRR | 55 min |
| Sep 5, 5:56 PM EDT | Special Weather Statement | GRR | 64 min |
| Sep 11, 2:17 AM EDT | Dense Fog Advisory | GRR | 8 hr |
| Sep 14, 3:40 AM EDT | Dense Fog Advisory | GRR | 6 hr |
| Sep 20, 11:55 AM EDT | Special Weather Statement | GRR | 50 min |
| Sep 21, 6:06 AM EDT | Special Weather Statement | GRR | 54 min |
| Sep 21, 7:41 AM EDT | Special Weather Statement | GRR | 94 min |
| Sep 25, 6:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 25, 6:31 PM EDT | Severe Thunderstorm Warning | GRR | 44 min |
| Oct 12, 3:42 PM EDT | Frost Advisory | GRR | 17 hr |
| Oct 13, 4:03 PM EDT | Frost Advisory | GRR | 16 hr |
| Oct 17, 3:52 AM EDT | Freeze Warning | GRR | 30 hr |
| Oct 20, 11:58 AM EDT | Wind Advisory | GRR | 8 hr |
| Oct 28, 11:25 AM EDT | Special Weather Statement | GRR | 2 hr |
| Nov 8, 1:55 AM EST | Winter Weather Advisory | GRR | 56 hr |
| Nov 15, 3:11 PM EST | Special Weather Statement | GRR | 3 hr |
| Nov 15, 5:27 PM EST | Winter Weather Advisory | GRR | 17 hr |
| Nov 24, 3:45 AM EST | Winter Storm Watch | GRR | 11 hr |
| Nov 24, 2:41 PM EST | Winter Weather Advisory | GRR | 46 hr |
| Dec 14, 6:15 PM EST | Dense Fog Advisory | GRR | 15 hr |
| Dec 16, 5:13 AM EST | Freezing Fog Advisory | GRR | 8 hr |
| Dec 30, 3:13 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.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.