Alert archive / Michigan / Oakland County
Weather alerts in Oakland County, Michigan, 2009
85 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Oakland County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 85
- Warnings
- 18
- Watches
- 18
- Advisories
- 30
- Busiest month
- June16 alerts
- Busiest day
- April 25, 20098 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Oakland County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 9 | 6 | 33% | 16 | 100% | 29 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 6 min |
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 4, 6:56 AM EST | Mesoscale Discussion | SPC | 3 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 9, 4:29 AM EST | Winter Weather Advisory | DTX | 23 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 17, 4:23 AM EST | Winter Weather Advisory | DTX | 25 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 | Wind Advisory | DTX | 27 hr |
| Feb 11, 5:11 AM EST | Dense Fog Advisory | DTX | 7 hr |
| 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 9, 4:05 PM EDT | Flood Watch | DTX | 35 hr |
| Mar 10, 4:28 AM EDT | High Wind Watch | DTX | 11 hr |
| Mar 10, 3:51 PM EDT | Wind Advisory | DTX | 24 hr |
| Apr 2, 9:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Apr 4, 4:03 PM EDT | Winter Storm Watch | DTX | 23 hr |
| Apr 5, 3:04 PM EDT | Winter Storm Warning | DTX | 17 hr |
| Apr 6, 2:04 AM EDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 20, 9:53 PM EDT | Areal Flood Advisory | DTX | 6 hr |
| Apr 25, 10:44 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 25, 11:55 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 25, 1:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Apr 25, 1:37 PM EDT | Severe Thunderstorm Warning | DTX | 53 min |
| Apr 25, 2:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 25, 3:39 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 25, 5:59 PM EDT | Severe Thunderstorm Warning | DTX | 68 min |
| Apr 25, 7:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Apr 25, 9:07 PM EDT | Areal Flood Advisory | DTX | 11 hr |
| Apr 27, 3:57 PM EDT | Flood Watch | DTX | 15 hr |
| May 10, 3:53 AM EDT | Frost Advisory | DTX | 28 hr |
| May 11, 1:33 PM EDT | Frost Advisory | DTX | 18 hr |
| May 14, 1:42 AM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 17, 3:20 PM EDT | Frost Advisory | DTX | 17 hr |
| May 27, 4:25 PM EDT | Severe Thunderstorm Warning | DTX | 43 min |
| May 28, 4:03 AM EDT | Dense Fog Advisory | DTX | 5 hr |
| Jun 8, 3:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 8, 4:02 PM EDT | Tornado Watch | SPC | 6 hr |
| Jun 8, 6:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 8, 8:40 PM EDT | Severe Thunderstorm Warning | DTX | 52 min |
| Jun 19, 2:57 AM EDT | Flash Flood Watch | DTX | 25 hr |
| Jun 19, 7:04 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 19, 9:57 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jun 19, 10:47 PM EDT | Flash Flood Warning | DTX | 5 hr |
| Jun 24, 3:51 AM EDT | Heat Advisory | DTX | 16 hr |
| 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, 2:26 PM EDT | Severe Thunderstorm Warning | DTX | 64 min |
| Jun 25, 3:19 PM EDT | Severe Thunderstorm Warning | DTX | 56 min |
| Jun 25, 4:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jun 25, 4:21 PM EDT | Flash Flood Warning | DTX | 3 hr |
| Jun 25, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 9, 1:45 AM EDT | Severe Thunderstorm Warning | DTX | 50 min |
| Aug 9, 2:05 AM EDT | Areal Flood Advisory | DTX | 3 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 9, 7:33 PM EDT | Severe Thunderstorm Warning | DTX | 72 min |
| Aug 9, 8:46 PM EDT | Severe Thunderstorm Warning | DTX | 49 min |
| Aug 19, 9:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 20, 2:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| 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 10, 4:06 AM EDT | Freeze Warning | DTX | 29 hr |
| Oct 29, 5:16 AM EDT | Dense Fog Advisory | DTX | 6 hr |
| Oct 30, 4:11 PM EDT | Wind Advisory | DTX | 20 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, 12:09 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 9, 4:10 AM EST | High Wind Warning | DTX | 16 hr |
| Dec 9, 3:50 PM EST | Winter Weather Advisory | DTX | 14 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.