Alert archive / Michigan / Oakland County
Weather alerts in Oakland County, Michigan, 2020
99 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 99
- Warnings
- 18
- Watches
- 15
- Advisories
- 25
- Busiest month
- July16 alerts
- Busiest day
- June 10, 20205 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, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 6 | 0% | 7 | 57% | 22 min |
| Flash flood warnings | 3 | 0 | 100% | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Detroit, MI: severe thunderstorm warnings | 81 | 63 | 22% | 163 | 88% | 25 min |
| NWS Detroit, MI: flash flood warnings | 12 | 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 | Lasted |
|---|---|---|---|
| Jan 7, 4:34 PM EST | Special Weather Statement | DTX | 41 min |
| Jan 8, 7:56 AM EST | Special Weather Statement | DTX | 64 min |
| Jan 8, 9:35 AM EST | Special Weather Statement | DTX | 55 min |
| Jan 9, 2:17 PM EST | Flood Watch | DTX | 50 hr |
| Jan 9, 2:59 PM EST | Winter Storm Watch | DTX | 25 hr |
| Jan 10, 3:34 PM EST | Ice Storm Warning | DTX | 36 hr |
| Jan 11, 10:20 AM EST | Areal Flood Warning | DTX | 18 hr |
| Jan 11, 8:25 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 12, 10:20 PM EST | Winter Weather Advisory | DTX | 10 hr |
| Jan 16, 2:37 PM EST | Winter Storm Watch | DTX | 13 hr |
| Jan 17, 3:55 AM EST | Winter Storm Warning | DTX | 31 hr |
| Jan 24, 9:34 PM EST | Dense Fog Advisory | DTX | 10 hr |
| Feb 5, 3:21 PM EST | Winter Weather Advisory | DTX | 17 hr |
| Feb 9, 3:16 AM EST | Winter Weather Advisory | DTX | 19 hr |
| Feb 24, 3:10 PM EST | Winter Storm Watch | DTX | 25 hr |
| Feb 25, 3:45 PM EST | Winter Weather Advisory | DTX | 30 hr |
| Mar 28, 3:41 PM EDT | Wind Advisory | DTX | 28 hr |
| Apr 7, 6:59 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Apr 7, 7:18 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 7, 7:41 PM EDT | Special Weather Statement | DTX | 64 min |
| Apr 11, 3:40 PM EDT | High Wind Watch | DTX | 24 hr |
| Apr 12, 3:26 PM EDT | Wind Advisory | DTX | 31 hr |
| Apr 21, 12:14 AM EDT | Special Weather Statement | DTX | 61 min |
| May 7, 3:53 PM EDT | Freeze Warning | DTX | 41 hr |
| May 11, 3:16 AM EDT | Freeze Warning | DTX | 29 hr |
| May 12, 12:26 PM EDT | Freeze Warning | DTX | 20 hr |
| May 14, 3:45 PM EDT | Flood Watch | DTX | 16 hr |
| May 16, 3:04 PM EDT | Flood Watch | DTX | 56 hr |
| May 29, 10:38 AM EDT | Special Weather Statement | DTX | 52 min |
| Jun 3, 1:56 AM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 3, 3:09 AM EDT | Special Weather Statement | DTX | 66 min |
| Jun 10, 12:41 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 10, 3:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 10, 3:46 PM EDT | Severe Thunderstorm Warning | DTX | 74 min |
| Jun 10, 4:32 PM EDT | Severe Thunderstorm Warning | DTX | 44 min |
| Jun 10, 6:26 PM EDT | Special Weather Statement | DTX | 34 min |
| Jun 11, 8:49 PM EDT | Special Weather Statement | DTX | 56 min |
| Jun 11, 9:41 PM EDT | Special Weather Statement | DTX | 49 min |
| Jun 21, 4:17 PM EDT | Special Weather Statement | DTX | 58 min |
| Jun 26, 7:57 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 26, 10:50 PM EDT | Special Weather Statement | DTX | 70 min |
| Jun 26, 10:57 PM EDT | Areal Flood Advisory | DTX | 4 hr |
| Jun 26, 11:39 PM EDT | Severe Thunderstorm Warning | DTX | 59 min |
| Jul 6, 6:39 PM EDT | Special Weather Statement | DTX | 51 min |
| Jul 7, 4:03 AM EDT | Excessive Heat Watch | DTX | 24 hr |
| Jul 7, 4:03 AM EDT | Heat Advisory | DTX | 68 hr |
| Jul 8, 4:15 PM EDT | Special Weather Statement | DTX | 45 min |
| Jul 9, 6:07 PM EDT | Severe Thunderstorm Warning | DTX | 23 min |
| Jul 9, 10:23 PM EDT | Special Weather Statement | DTX | 52 min |
| Jul 9, 11:01 PM EDT | Special Weather Statement | DTX | 59 min |
| Jul 10, 1:06 PM EDT | Special Weather Statement | DTX | 54 min |
| Jul 10, 1:23 PM EDT | Severe Thunderstorm Warning | DTX | 52 min |
| Jul 10, 3:06 PM EDT | Flash Flood Watch | DTX | 10 hr |
| Jul 10, 9:59 PM EDT | Areal Flood Advisory | DTX | 3 hr |
| Jul 10, 10:25 PM EDT | Flash Flood Warning | DTX | 3 hr |
| Jul 19, 3:05 AM EDT | Heat Advisory | DTX | 10 hr |
| Jul 19, 8:42 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 10:21 AM EDT | Severe Thunderstorm Warning | DTX | 54 min |
| Jul 19, 11:16 AM EDT | Special Weather Statement | DTX | 44 min |
| Aug 1, 3:51 AM EDT | Flash Flood Watch | DTX | 33 hr |
| Aug 2, 6:33 AM EDT | Flash Flood Warning | DTX | 72 min |
| Aug 10, 6:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Aug 16, 9:08 AM EDT | Special Weather Statement | DTX | 67 min |
| Aug 27, 3:15 PM EDT | Special Weather Statement | DTX | 60 min |
| Aug 28, 5:36 AM EDT | Areal Flood Advisory | DTX | 3 hr |
| Aug 28, 6:02 AM EDT | Areal Flood Advisory | DTX | 3 hr |
| Aug 28, 6:11 AM EDT | Flash Flood Warning | DTX | 4 hr |
| Aug 28, 10:02 AM EDT | Areal Flood Warning | DTX | 6 hr |
| Aug 28, 9:15 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 29, 1:00 AM EDT | Special Weather Statement | DTX | 45 min |
| Sep 1, 7:33 PM EDT | Special Weather Statement | DTX | 72 min |
| Sep 6, 11:57 PM EDT | Special Weather Statement | DTX | 78 min |
| Sep 7, 1:57 AM EDT | Special Weather Statement | DTX | 2 hr |
| Sep 18, 11:10 AM EDT | Frost Advisory | DTX | 22 hr |
| Oct 1, 12:24 PM EDT | Special Weather Statement | DTX | 51 min |
| Oct 1, 2:45 PM EDT | Special Weather Statement | DTX | 60 min |
| Oct 2, 2:38 PM EDT | Frost Advisory | DTX | 17 hr |
| Oct 4, 3:10 PM EDT | Frost Advisory | DTX | 17 hr |
| Oct 12, 7:42 PM EDT | Special Weather Statement | DTX | 63 min |
| Oct 15, 2:11 PM EDT | Freeze Warning | DTX | 19 hr |
| Oct 16, 2:58 PM EDT | Frost Advisory | DTX | 17 hr |
| Oct 23, 1:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Oct 23, 1:56 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Oct 23, 3:01 PM EDT | Special Weather Statement | DTX | 74 min |
| Nov 1, 3:09 AM EST | Wind Advisory | DTX | 19 hr |
| Nov 10, 10:56 PM EST | Special Weather Statement | DTX | 64 min |
| Nov 14, 3:13 AM EST | High Wind Watch | DTX | 11 hr |
| Nov 14, 2:41 PM EST | Wind Advisory | DTX | 12 hr |
| Nov 15, 3:06 AM EST | High Wind Warning | DTX | 20 hr |
| Nov 15, 9:58 AM EST | Mesoscale Discussion | SPC | 92 min |
| Nov 15, 6:59 PM EST | Wind Advisory | DTX | 8 hr |
| Nov 19, 2:28 AM EST | Wind Advisory | DTX | 15 hr |
| Nov 22, 4:05 AM EST | Winter Weather Advisory | DTX | 11 hr |
| Nov 30, 3:24 AM EST | Winter Weather Advisory | DTX | 36 hr |
| Dec 10, 2:16 AM EST | Freezing Fog Advisory | DTX | 8 hr |
| Dec 21, 7:37 PM EST | Special Weather Statement | DTX | 53 min |
| Dec 29, 3:57 AM EST | Winter Weather Advisory | DTX | 32 hr |
| Dec 29, 8:50 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 30, 2:15 AM EST | Mesoscale Discussion | SPC | 6 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 archive20192021
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.