Alert archive / Michigan / Calhoun County
Weather alerts in Calhoun County, Michigan, 2023
70 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Calhoun County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 70
- Warnings
- 18
- Watches
- 12
- Advisories
- 20
- Busiest month
- April15 alerts
- Busiest day
- April 5, 20235 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Calhoun County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 6 | 25% | 8 | 75% | 18 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 5 | 1 | 80% | 4 | 25% | 10 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 82 | 51 | 38% | 164 | 83% | 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 2, 3:55 AM EST | Dense Fog Advisory | GRR | 8 hr |
| Jan 12, 12:44 AM EST | Dense Fog Advisory | GRR | 6 hr |
| Jan 24, 10:58 AM EST | Winter Weather Advisory | GRR | 62 hr |
| Jan 27, 9:01 PM EST | Winter Weather Advisory | GRR | 34 hr |
| Feb 2, 12:55 PM EST | Wind Chill Advisory | GRR | 20 hr |
| Feb 8, 3:03 PM EST | Wind Advisory | GRR | 32 hr |
| Feb 14, 3:51 AM EST | Wind Advisory | GRR | 36 hr |
| Feb 15, 3:33 PM EST | Winter Weather Advisory | GRR | 39 hr |
| Feb 20, 3:52 PM EST | Winter Storm Watch | GRR | 23 hr |
| Feb 21, 2:42 PM EST | Ice Storm Warning | GRR | 37 hr |
| Feb 22, 9:46 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 22, 4:27 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 2, 3:53 AM EST | Winter Storm Watch | GRR | 18 hr |
| Mar 2, 9:46 PM EST | Winter Storm Warning | GRR | 25 hr |
| Mar 3, 5:25 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 9, 3:25 AM EST | Winter Weather Advisory | GRR | 32 hr |
| Mar 12, 3:48 PM EDT | Winter Weather Advisory | GRR | 21 hr |
| Mar 17, 3:43 AM EDT | Winter Weather Advisory | GRR | 46 hr |
| Mar 31, 8:30 PM EDT | Severe Thunderstorm Warning | GRR | 45 min |
| Mar 31, 8:54 PM EDT | Severe Thunderstorm Warning | GRR | 21 min |
| Apr 5, 7:09 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 5, 8:41 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 5, 9:12 AM EDT | Areal Flood Advisory | GRR | 6 hr |
| Apr 5, 10:57 AM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 5, 11:26 AM EDT | Severe Thunderstorm Warning | GRR | 50 min |
| Apr 11, 3:42 PM EDT | Fire Weather Watch | GRR | 13 hr |
| Apr 12, 5:05 AM EDT | Red Flag Warning | GRR | 15 hr |
| Apr 13, 8:47 AM EDT | Red Flag Warning | GRR | 11 hr |
| Apr 18, 1:51 PM EDT | Freeze Warning | GRR | 19 hr |
| Apr 23, 2:53 PM EDT | Freeze Warning | GRR | 16 hr |
| Apr 24, 3:26 PM EDT | Freeze Warning | GRR | 17 hr |
| Apr 25, 10:30 AM EDT | Freeze Warning | GRR | 22 hr |
| Apr 26, 10:34 AM EDT | Freeze Warning | GRR | 22 hr |
| May 3, 3:27 PM EDT | Frost Advisory | GRR | 18 hr |
| May 7, 7:27 AM EDT | Special Weather Statement | GRR | 2 hr |
| May 17, 3:00 PM EDT | Frost Advisory | GRR | 16 hr |
| Jun 3, 3:48 PM EDT | Fire Weather Watch | GRR | 12 hr |
| Jun 3, 5:08 PM EDT | Special Weather Statement | GRR | 52 min |
| Jun 3, 5:50 PM EDT | Severe Thunderstorm Warning | GRR | 47 min |
| Jun 4, 3:33 AM EDT | Red Flag Warning | GRR | 17 hr |
| Jun 25, 1:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 25, 4:10 PM EDT | Severe Thunderstorm Warning | GRR | 51 min |
| Jun 25, 5:03 PM EDT | Severe Thunderstorm Warning | GRR | 57 min |
| Jul 2, 6:38 PM EDT | Special Weather Statement | GRR | 97 min |
| Jul 12, 8:55 PM EDT | Tornado Watch | SPC | 6 hr |
| Jul 12, 10:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 14, 2:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 11:40 PM EDT | Special Weather Statement | GRR | 50 min |
| Jul 20, 10:38 AM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 20, 12:16 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 26, 10:03 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 26, 12:24 PM EDT | Special Weather Statement | GRR | 66 min |
| Jul 26, 12:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 26, 6:06 PM EDT | Severe Thunderstorm Warning | GRR | 39 min |
| Jul 26, 6:42 PM EDT | Severe Thunderstorm Warning | GRR | 16 min |
| Jul 28, 11:58 PM EDT | Special Weather Statement | GRR | 62 min |
| Jul 29, 12:00 AM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 29, 1:57 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 3:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 14, 12:09 PM EDT | Flood Watch | GRR | 24 hr |
| Aug 22, 4:12 AM EDT | Heat Advisory | GRR | 65 hr |
| Aug 24, 4:44 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 24, 6:35 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 24, 8:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 29, 10:36 PM EDT | Dense Fog Advisory | GRR | 11 hr |
| Nov 27, 3:17 PM EST | Winter Weather Advisory | GRR | 20 hr |
| Dec 9, 3:04 AM EST | Wind Advisory | GRR | 11 hr |
| Dec 23, 9:22 AM EST | Dense Fog Advisory | GRR | 5 hr |
| Dec 23, 8:23 PM EST | Dense Fog Advisory | GRR | 15 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 | 8 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 14 |
| Special Weather Statement | 6 |
| Flooding | |
| Flood Watch | 1 |
| Areal Flood Advisory | 1 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 5 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.