Alert archive / Michigan / Monroe County
Weather alerts in Monroe County, Michigan, 2009
64 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 64
- Warnings
- 13
- Watches
- 15
- Advisories
- 23
- Busiest month
- January10 alerts
- Busiest day
- June 25, 20096 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 Monroe County in 2009 had a tornado report inside them.
Monroe County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 1 | 1 | 0% | 2 | 100% | 48 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Detroit, MI: tornado warnings | 5 | 0 | 100% | 0 | ||
| NWS Detroit, MI: severe thunderstorm warnings | 49 | 28 | 43% | 96 | 82% | 30 min |
| NWS Detroit, MI: flash flood warnings | 6 | 5 | 17% | 11 | 64% | 85 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, 3:42 PM EST | Freezing Rain Advisory | DTX | 22 hr |
| Jan 6, 9:50 PM EST | Winter Weather Advisory | DTX | 10 hr |
| Jan 8, 3:07 PM EST | Winter Storm Watch | DTX | 13 hr |
| Jan 9, 4:29 AM EST | Winter Storm Warning | DTX | 42 hr |
| Jan 10, 6:33 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 12, 4:01 PM EST | Winter Weather Advisory | DTX | 19 hr |
| Jan 14, 11:46 AM EST | Wind Chill Watch | DTX | 39 hr |
| Jan 14, 11:46 AM EST | Wind Chill Advisory | DTX | 67 hr |
| Jan 15, 10:39 AM EST | Wind Chill Warning | DTX | 44 hr |
| Jan 27, 3:32 AM EST | Winter Weather Advisory | DTX | 33 hr |
| Feb 4, 3:38 AM EST | Wind Chill Advisory | DTX | 31 hr |
| Feb 10, 3:52 PM EST | Flood Watch | DTX | 36 hr |
| Feb 11, 4:28 AM EST | High Wind Warning | DTX | 24 hr |
| Feb 11, 4:28 AM EST | Wind Advisory | DTX | 27 hr |
| Feb 11, 5:11 AM EST | Dense Fog Advisory | DTX | 7 hr |
| Feb 11, 6:26 AM EST | River Flood Warning | DTX | 3 days |
| Feb 11, 2:22 PM EST | River Flood Warning | DTX | 4 days |
| Feb 19, 3:41 PM EST | Winter Storm Watch | DTX | 24 hr |
| Feb 20, 3:34 PM EST | Winter Storm Warning | DTX | 25 hr |
| Feb 21, 6:35 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Mar 6, 4:30 PM EST | Flood Watch | DTX | 35 hr |
| Mar 8, 4:36 AM EDT | Areal Flood Advisory | DTX | 18 hr |
| Mar 8, 4:25 PM EDT | Wind Advisory | DTX | 7 hr |
| Mar 9, 4:05 PM EDT | Flood Watch | DTX | 35 hr |
| Mar 10, 4:28 AM EDT | High Wind Watch | DTX | 11 hr |
| Mar 10, 10:42 AM EDT | River Flood Warning | DTX | 4 days |
| Mar 10, 10:42 AM EDT | River Flood Warning | DTX | 5 days |
| Mar 10, 10:42 AM EDT | River Flood Warning | DTX | 5 days |
| Mar 10, 3:51 PM EDT | Wind Advisory | DTX | 24 hr |
| Apr 2, 9:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Apr 5, 3:04 PM EDT | Winter Weather Advisory | DTX | 17 hr |
| Apr 25, 3:39 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 25, 7:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 9, 4:03 AM EDT | Wind Advisory | DTX | 12 hr |
| May 14, 1:42 AM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 17, 3:20 PM EDT | Frost Advisory | DTX | 17 hr |
| Jun 1, 5:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jun 19, 2:57 AM EDT | Flash Flood Watch | DTX | 25 hr |
| Jun 19, 4:16 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 19, 7:04 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 25, 1:30 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 25, 2:08 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 25, 4:01 PM EDT | Severe Thunderstorm Warning | DTX | 65 min |
| Jun 25, 4:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jun 25, 4:35 PM EDT | Tornado Warning | DTX | 29 min |
| Jun 25, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 9, 4:11 AM EDT | Heat Advisory | DTX | 18 hr |
| Aug 9, 5:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 9, 5:48 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 11, 12:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 19, 9:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 20, 11:42 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 27, 3:44 PM EDT | Wind Advisory | DTX | 30 hr |
| Sep 27, 10:46 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 30, 4:40 AM EDT | Frost Advisory | DTX | 11 hr |
| Sep 30, 4:40 AM EDT | Freeze Warning | DTX | 27 hr |
| Oct 7, 2:04 AM EDT | Wind Advisory | DTX | 8 hr |
| Oct 29, 5:16 AM EDT | Dense Fog Advisory | DTX | 6 hr |
| Nov 21, 9:34 PM EST | Dense Fog Advisory | DTX | 12 hr |
| Dec 8, 4:41 AM EST | Winter Weather Advisory | DTX | 29 hr |
| Dec 8, 3:36 PM EST | High Wind Watch | DTX | 13 hr |
| Dec 9, 4:10 AM EST | High Wind Warning | DTX | 16 hr |
| Dec 9, 8:18 PM EST | Wind Advisory | DTX | 2 hr |
| Dec 24, 4:30 PM EST | Winter Weather Advisory | DTX | 20 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 archive20082010
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.