Alert archive / Michigan / Monroe County
Weather alerts in Monroe County, Michigan, 2023
88 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Monroe County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 88
- Warnings
- 26
- Watches
- 12
- Advisories
- 16
- Busiest month
- July25 alerts
- Busiest day
- August 24, 20237 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 2 tornado warnings covering Monroe County in 2023 had a tornado report inside them; 1 of 5 tornado reports fell inside a warning, on average 0 minutes after it went out.
Monroe County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 5 | 20% | 0 min |
| Severe thunderstorm warnings | 15 | 12 | 20% | 23 | 100% | 27 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Detroit, MI: tornado warnings | 15 | 5 | 67% | 20 | 60% | 11 min |
| NWS Detroit, MI: severe thunderstorm warnings | 110 | 70 | 36% | 212 | 90% | 27 min |
| NWS Detroit, MI: flash flood warnings | 4 | 1 | 75% | 2 | 100% | 0 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, 3:21 AM EST | Dense Fog Advisory | DTX | 9 hr |
| Jan 3, 3:48 AM EST | Dense Fog Advisory | DTX | 3 hr |
| Jan 4, 3:20 AM EST | Dense Fog Advisory | DTX | 10 hr |
| Jan 12, 12:48 AM EST | Dense Fog Advisory | DTX | 7 hr |
| Jan 23, 3:50 PM EST | Winter Storm Watch | DTX | 23 hr |
| Jan 24, 2:56 PM EST | Winter Storm Warning | DTX | 31 hr |
| Jan 25, 10:14 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 2, 2:03 PM EST | Wind Chill Advisory | DTX | 19 hr |
| Feb 8, 3:04 PM EST | Wind Advisory | DTX | 31 hr |
| Feb 14, 3:42 AM EST | Wind Advisory | DTX | 36 hr |
| Feb 15, 3:43 PM EST | Winter Weather Advisory | DTX | 36 hr |
| Feb 21, 3:33 PM EST | Ice Storm Warning | DTX | 36 hr |
| Feb 21, 3:33 PM EST | Winter Weather Advisory | DTX | 27 hr |
| Feb 22, 4:27 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 2, 3:53 AM EST | Winter Storm Watch | DTX | 18 hr |
| Mar 2, 3:47 PM EST | Lakeshore Flood Watch | DTX | 12 hr |
| Mar 2, 10:08 PM EST | Winter Storm Warning | DTX | 30 hr |
| Mar 3, 4:02 AM EST | Lakeshore Flood Warning | DTX | 24 hr |
| Mar 3, 5:25 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 9, 3:20 AM EST | Winter Weather Advisory | DTX | 41 hr |
| Mar 24, 3:48 PM EDT | Wind Advisory | DTX | 32 hr |
| Apr 1, 12:50 AM EDT | Severe Thunderstorm Warning | DTX | 39 min |
| Apr 1, 1:03 AM EDT | Severe Thunderstorm Warning | DTX | 57 min |
| Apr 1, 10:39 AM EDT | Special Weather Statement | DTX | 81 min |
| Apr 1, 10:51 AM EDT | Severe Thunderstorm Warning | DTX | 39 min |
| Apr 1, 11:28 AM EDT | Severe Thunderstorm Warning | DTX | 27 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, 10:57 AM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 5, 2:18 PM EDT | Special Weather Statement | DTX | 42 min |
| Apr 16, 1:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 24, 3:00 PM EDT | Freeze Warning | DTX | 17 hr |
| Apr 25, 10:38 AM EDT | Freeze Warning | DTX | 21 hr |
| Apr 26, 10:49 AM EDT | Freeze Warning | DTX | 21 hr |
| Jun 15, 4:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 15, 5:37 PM EDT | Severe Thunderstorm Warning | DTX | 53 min |
| Jun 15, 6:12 PM EDT | Tornado Warning | DTX | 18 min |
| Jun 15, 6:27 PM EDT | Severe Thunderstorm Warning | DTX | 48 min |
| Jun 25, 3:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 25, 4:18 PM EDT | Tornado Watch | SPC | 4 hr |
| Jun 25, 5:40 PM EDT | Severe Thunderstorm Warning | DTX | 65 min |
| Jun 26, 2:36 PM EDT | Special Weather Statement | DTX | 39 min |
| Jul 1, 1:37 PM EDT | Special Weather Statement | DTX | 53 min |
| Jul 11, 5:18 PM EDT | Severe Thunderstorm Warning | DTX | 72 min |
| Jul 11, 6:29 PM EDT | Special Weather Statement | DTX | 46 min |
| Jul 11, 8:24 PM EDT | Special Weather Statement | DTX | 36 min |
| Jul 12, 8:55 PM EDT | Tornado Watch | SPC | 6 hr |
| Jul 12, 10:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 13, 12:59 AM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 14, 2:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 4:21 PM EDT | Severe Thunderstorm Warning | DTX | 43 min |
| Jul 14, 7:47 PM EDT | Special Weather Statement | DTX | 58 min |
| Jul 14, 9:56 PM EDT | Special Weather Statement | DTX | 64 min |
| Jul 20, 12:16 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 20, 2:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 20, 5:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 26, 1:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 26, 2:03 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 26, 2:58 PM EDT | Severe Thunderstorm Warning | DTX | 62 min |
| Jul 26, 3:14 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 26, 6:33 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 26, 7:45 PM EDT | Special Weather Statement | DTX | 45 min |
| Jul 26, 8:02 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 28, 3:36 AM EDT | Flood Watch | DTX | 25 hr |
| Jul 29, 1:25 AM EDT | Severe Thunderstorm Warning | DTX | 40 min |
| Jul 29, 1:57 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 2:52 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 10, 4:10 PM EDT | Special Weather Statement | DTX | 50 min |
| Aug 11, 3:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 8:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 12, 12:41 PM EDT | Special Weather Statement | DTX | 64 min |
| Aug 23, 3:20 PM EDT | Heat Advisory | DTX | 29 hr |
| Aug 24, 12:28 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 24, 2:17 AM EDT | Severe Thunderstorm Warning | DTX | 58 min |
| Aug 24, 3:26 AM EDT | Severe Thunderstorm Warning | DTX | 64 min |
| Aug 24, 3:30 AM EDT | Flash Flood Warning | DTX | 4 hr |
| Aug 24, 6:54 AM EDT | Areal Flood Warning | DTX | 9 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, 9:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 24, 10:03 PM EDT | Severe Thunderstorm Warning | DTX | 72 min |
| Aug 24, 10:42 PM EDT | Tornado Warning | DTX | 10 min |
| Aug 24, 11:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 6, 8:16 PM EDT | Severe Thunderstorm Warning | DTX | 24 min |
| Sep 30, 1:35 AM EDT | Dense Fog Advisory | DTX | 10 hr |
| Dec 24, 3:21 AM EST | Dense Fog Advisory | DTX | 8 hr |
| Dec 24, 6:42 PM EST | Dense Fog Advisory | DTX | 9 hr |
| Dec 25, 6:17 AM EST | Dense Fog Advisory | DTX | 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 | 15 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 23 |
| Special Weather Statement | 11 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 1 |
| Flood Watch | 1 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 3 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 3 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
| Coast and beach | |
| Lakeshore Flood Warning | 1 |
| Lakeshore Flood Watch | 1 |
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.