Alert archive / Michigan / Flash Flood Warnings
Flash Flood Warnings in Michigan, 2013
15 flash flood warnings in 2013. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2013. Tap one for its archive.
- Flash Flood Warnings
- 15
- Busiest month
- September5 flash flood warnings
- Busiest day
- June 13, 20132 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
5 of 15 flash flood warnings covering Michigan in 2013 had a flash flood report inside them; 13 of 18 flash flood reports fell inside a warning, on average 103 minutes after it went out.
Michigan, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 15 | 5 | 67% | 18 | 72% | 103 min |
Each office's whole area, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Northern Indiana: flash flood warnings | 19 | 8 | 58% | 16 | 94% | 124 min |
| NWS Grand Rapids, MI: flash flood warnings | 3 | 2 | 33% | 6 | 100% | 104 min |
| NWS Gaylord, MI: flash flood warnings | 3 | 2 | 33% | 11 | 55% | 111 min |
| NWS Marquette, MI: flash flood warnings | 1 | 0 | 100% | 0 | ||
| NWS Detroit, MI: flash flood warnings | 3 | 0 | 100% | 0 |
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 | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 10:55 PM EDT | Flash Flood Warning | GRR | Allegan, Barry, Clinton, Eaton, Ingham, Ionia and 2 more | 6 hr |
| Jun 13, 4:07 AM EDT | Flash Flood Warning | GRR | Eaton, Ingham | 6 hr |
| Jun 25, 8:31 PM EDT | Flash Flood Warning | IWX | Branch, Hillsdale, Saint Joseph | 6 hr |
| Jun 27, 4:27 PM EDT | Flash Flood Warning | MQT | Menominee | 3 hr |
| Jul 15, 7:52 PM EDT | Flash Flood Warning | DTX | Macomb | 3 hr |
| Aug 7, 2:53 PM EDT | Flash Flood Warning | IWX | Berrien | 6 hr |
| Aug 22, 3:44 PM EDT | Flash Flood Warning | GRR | Calhoun | 6 hr |
| Aug 27, 3:18 PM EDT | Flash Flood Warning | APX | Benzie, Grand Traverse, Kalkaska, Leelanau | 6 hr |
| Aug 30, 11:19 PM EDT | Flash Flood Warning | DTX | Macomb, Oakland, Wayne | 6 hr |
| Sep 9, 7:41 AM EDT | Flash Flood Warning | IWX | Branch, Hillsdale | 4 hr |
| Sep 9, 9:13 AM EDT | Flash Flood Warning | DTX | Lenawee | 5 hr |
| Sep 9, 11:47 PM EDT | Flash Flood Warning | APX | Chippewa | 6 hr |
| Sep 19, 11:25 AM EDT | Flash Flood Warning | IWX | Berrien | 110 min |
| Sep 19, 12:12 PM EDT | Flash Flood Warning | IWX | Berrien | 108 min |
| Nov 17, 3:15 PM EST | Flash Flood Warning | APX | Antrim, Benzie, Charlevoix, Cheboygan, Chippewa, Emmet and 6 more | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Berrien County3
- Eaton County2
- Ingham County2
- Branch County2
- Hillsdale County2
- Macomb County2
- Benzie County2
- Grand Traverse County2
- Kalkaska County2
- Leelanau County2
- Chippewa County2
- Allegan County1
- Barry County1
- Clinton County1
- Ionia County1
- Kent County1
- Ottawa County1
- Saint Joseph County1
- Menominee County1
- Calhoun County1
- Oakland County1
- Wayne County1
- Lenawee County1
- Antrim County1
- Charlevoix County1
- Cheboygan County1
- Emmet County1
- Mackinac County1
- Manistee County1
- Wexford County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20122014
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.