Alert archive / Michigan / Lapeer County
Weather alerts in Lapeer County, Michigan, 2011
98 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lapeer County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 98
- Warnings
- 14
- Watches
- 25
- Advisories
- 33
- Busiest month
- May16 alerts
- Busiest day
- June 22, 20118 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Lapeer County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 10 | 7 | 30% | 14 | 93% | 18 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Detroit, MI: tornado warnings | 16 | 2 | 88% | 6 | 50% | 12 min |
| NWS Detroit, MI: severe thunderstorm warnings | 145 | 100 | 31% | 267 | 80% | 28 min |
| NWS Detroit, MI: flash flood warnings | 10 | 4 | 60% | 11 | 45% | 66 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 11, 4:03 AM EST | Winter Weather Advisory | DTX | 20 hr |
| Jan 17, 3:41 PM EST | Winter Weather Advisory | DTX | 20 hr |
| Jan 19, 4:27 AM EST | Freezing Rain Advisory | DTX | 3 hr |
| Jan 21, 4:31 PM EST | Wind Chill Advisory | DTX | 5 hr |
| Jan 23, 7:04 PM EST | Wind Chill Advisory | DTX | 8 hr |
| Jan 28, 3:47 AM EST | Winter Weather Advisory | DTX | 30 hr |
| Jan 30, 4:24 AM EST | Winter Storm Watch | DTX | 48 hr |
| Feb 1, 4:25 AM EST | Blizzard Warning | DTX | 37 hr |
| Feb 1, 7:28 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 2, 3:33 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 2, 7:05 AM EST | Winter Weather Advisory | DTX | 12 hr |
| Feb 18, 1:54 PM EST | Wind Advisory | DTX | 12 hr |
| Feb 19, 3:17 AM EST | Winter Storm Watch | DTX | 25 hr |
| Feb 20, 4:10 AM EST | Winter Storm Warning | DTX | 26 hr |
| Feb 28, 12:04 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Mar 4, 4:09 AM EST | Winter Weather Advisory | DTX | 10 hr |
| Mar 4, 2:49 PM EST | Flood Watch | DTX | 20 hr |
| Mar 4, 8:38 PM EST | Winter Weather Advisory | DTX | 10 hr |
| Mar 8, 10:51 PM EST | Winter Weather Advisory | DTX | 14 hr |
| Mar 9, 9:10 PM EST | Dense Fog Advisory | DTX | 12 hr |
| Mar 10, 4:20 PM EST | Winter Weather Advisory | DTX | 17 hr |
| Mar 21, 4:57 PM EDT | Winter Storm Watch | DTX | 19 hr |
| Mar 22, 4:18 AM EDT | Winter Storm Warning | DTX | 34 hr |
| Mar 22, 9:57 PM EDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 23, 10:52 AM EDT | Winter Weather Advisory | DTX | 5 hr |
| Apr 16, 3:59 PM EDT | Wind Advisory | DTX | 27 hr |
| Apr 26, 3:02 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 26, 8:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| May 4, 2:46 PM EDT | Frost Advisory | DTX | 17 hr |
| May 14, 11:06 AM EDT | Areal Flood Advisory | DTX | 6 hr |
| May 14, 11:09 AM EDT | Areal Flood Advisory | DTX | 6 hr |
| May 20, 4:19 AM EDT | Dense Fog Advisory | DTX | 6 hr |
| May 22, 3:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 22, 3:41 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 23, 12:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| May 23, 2:15 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 25, 9:43 AM EDT | Flood Watch | DTX | 30 hr |
| May 29, 11:26 AM EDT | Flood Watch | DTX | 8 hr |
| May 29, 1:29 PM EDT | Tornado Watch | SPC | 7 hr |
| May 29, 5:57 PM EDT | Severe Thunderstorm Warning | DTX | 78 min |
| May 29, 6:51 PM EDT | Mesoscale Discussion | SPC | 54 min |
| May 31, 4:15 AM EDT | Heat Advisory | DTX | 16 hr |
| May 31, 3:33 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 31, 7:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 3:08 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 7, 9:52 AM EDT | Heat Advisory | DTX | 38 hr |
| Jun 9, 12:45 AM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 21, 4:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 21, 4:57 PM EDT | Tornado Watch | SPC | 7 hr |
| Jun 21, 7:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 21, 10:43 PM EDT | Severe Thunderstorm Warning | DTX | 42 min |
| Jun 22, 4:22 AM EDT | Flash Flood Watch | DTX | 15 hr |
| Jun 22, 11:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 22, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 22, 3:22 PM EDT | Severe Thunderstorm Warning | DTX | 52 min |
| Jun 22, 4:35 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jun 22, 4:54 PM EDT | Severe Thunderstorm Warning | DTX | 66 min |
| Jun 22, 5:40 PM EDT | Severe Thunderstorm Warning | DTX | 80 min |
| Jul 2, 4:58 AM EDT | Heat Advisory | DTX | 15 hr |
| Jul 2, 2:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 2, 2:24 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 2, 5:28 PM EDT | Severe Thunderstorm Warning | DTX | 77 min |
| Jul 2, 6:42 PM EDT | Severe Thunderstorm Warning | DTX | 63 min |
| Jul 2, 7:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 11, 8:10 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 11, 9:07 AM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 11, 11:57 AM EDT | Severe Thunderstorm Warning | DTX | 63 min |
| Jul 18, 12:48 PM EDT | Heat Advisory | DTX | 39 hr |
| Jul 18, 1:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 18, 4:21 PM EDT | Excessive Heat Watch | DTX | 36 hr |
| Jul 20, 3:57 AM EDT | Excessive Heat Warning | DTX | 60 hr |
| Jul 28, 3:16 PM EDT | Flash Flood Watch | DTX | 16 hr |
| Aug 1, 3:47 AM EDT | Mesoscale Discussion | SPC | 58 min |
| Aug 2, 2:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 13, 5:28 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 20, 12:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 20, 1:41 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 20, 2:40 PM EDT | Areal Flood Advisory | DTX | 4 hr |
| Aug 21, 2:42 AM EDT | Dense Fog Advisory | DTX | 6 hr |
| Aug 24, 6:00 PM EDT | Tornado Watch | SPC | 5 hr |
| Aug 24, 8:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 2, 3:18 AM EDT | Heat Advisory | DTX | 17 hr |
| Sep 3, 7:22 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 3, 4:05 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 3, 6:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Sep 3, 8:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Sep 3, 9:38 PM EDT | Severe Thunderstorm Warning | DTX | 40 min |
| Sep 4, 12:15 AM EDT | Severe Thunderstorm Warning | DTX | 45 min |
| Sep 15, 3:21 PM EDT | Frost Advisory | DTX | 18 hr |
| Sep 20, 2:22 AM EDT | Dense Fog Advisory | DTX | 8 hr |
| Oct 15, 3:53 AM EDT | Wind Advisory | DTX | 14 hr |
| Oct 30, 3:59 AM EDT | Dense Fog Advisory | DTX | 6 hr |
| Nov 9, 11:01 AM EST | Wind Advisory | DTX | 12 hr |
| Nov 28, 12:53 PM EST | Flood Watch | DTX | 21 hr |
| Nov 29, 3:12 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Nov 29, 3:36 PM EST | Winter Weather Advisory | DTX | 12 hr |
| Nov 29, 8:55 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Dec 21, 7:10 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 | 10 |
| Severe Thunderstorm Watch | 11 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 26 |
| Flooding | |
| Flash Flood Watch | 2 |
| Flood Watch | 4 |
| Areal Flood Advisory | 3 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 10 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 5 |
| Cold | |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.