Alert archive / Michigan / Sanilac County
Weather alerts in Sanilac County, Michigan, 2017
80 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sanilac County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 80
- Warnings
- 14
- Watches
- 8
- Advisories
- 27
- Busiest month
- April13 alerts
- Busiest day
- April 6, 20173 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 1 tornado warnings covering Sanilac County in 2017 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 3 minutes after it went out.
Sanilac County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 2 | 100% | 3 min |
| Severe thunderstorm warnings | 7 | 4 | 43% | 5 | 100% | 30 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Detroit, MI: tornado warnings | 3 | 1 | 67% | 4 | 50% | 3 min |
| NWS Detroit, MI: severe thunderstorm warnings | 55 | 35 | 36% | 89 | 76% | 20 min |
| NWS Detroit, MI: flash flood warnings | 4 | 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 3, 12:14 PM EST | Dense Fog Advisory | DTX | 4 hr |
| Jan 9, 3:19 PM EST | Winter Weather Advisory | DTX | 22 hr |
| Jan 10, 3:44 AM EST | High Wind Watch | DTX | 10 hr |
| Jan 10, 2:11 PM EST | High Wind Warning | DTX | 13 hr |
| Jan 11, 7:05 PM EST | Special Weather Statement | DTX | 55 min |
| Jan 12, 6:27 AM EST | Freezing Rain Advisory | DTX | 6 hr |
| Jan 16, 3:35 AM EST | Winter Weather Advisory | DTX | 27 hr |
| Jan 20, 4:06 PM EST | Dense Fog Advisory | DTX | 20 hr |
| Jan 21, 3:23 PM EST | Dense Fog Advisory | DTX | 36 hr |
| Feb 21, 10:37 PM EST | Dense Fog Advisory | DTX | 11 hr |
| Feb 24, 10:17 AM EST | Special Weather Statement | DTX | 58 min |
| Feb 24, 3:44 PM EST | Severe Thunderstorm Watch | SPC | 6 hr |
| Feb 24, 8:30 PM EST | Special Weather Statement | DTX | 45 min |
| Mar 7, 11:25 AM EST | High Wind Watch | DTX | 11 hr |
| Mar 7, 10:14 PM EST | High Wind Warning | DTX | 21 hr |
| Mar 8, 6:56 PM EST | Wind Advisory | DTX | 2 hr |
| Mar 14, 3:33 AM EDT | Winter Weather Advisory | DTX | 30 hr |
| Apr 5, 3:57 AM EDT | High Wind Watch | DTX | 25 hr |
| Apr 5, 3:00 PM EDT | Flood Watch | DTX | 14 hr |
| Apr 6, 4:28 AM EDT | Winter Storm Warning | DTX | 252 days |
| Apr 6, 9:33 AM EDT | High Wind Warning | DTX | 18 hr |
| Apr 6, 9:33 AM EDT | Winter Weather Advisory | DTX | 12 hr |
| Apr 7, 3:24 AM EDT | Wind Advisory | DTX | 12 hr |
| Apr 10, 11:48 AM EDT | Special Weather Statement | DTX | 42 min |
| Apr 10, 12:23 PM EDT | Special Weather Statement | DTX | 67 min |
| Apr 10, 3:02 PM EDT | Flood Watch | DTX | 12 hr |
| Apr 20, 7:22 AM EDT | Special Weather Statement | DTX | 38 min |
| Apr 20, 1:44 PM EDT | Special Weather Statement | DTX | 61 min |
| Apr 27, 12:17 AM EDT | Special Weather Statement | DTX | 58 min |
| Apr 27, 12:33 AM EDT | Severe Thunderstorm Warning | DTX | 32 min |
| May 1, 8:33 AM EDT | Special Weather Statement | DTX | 27 min |
| May 1, 1:02 PM EDT | Special Weather Statement | DTX | 43 min |
| May 7, 4:03 AM EDT | Freeze Warning | DTX | 28 hr |
| May 8, 2:16 PM EDT | Freeze Warning | DTX | 18 hr |
| May 9, 3:17 PM EDT | Frost Advisory | DTX | 17 hr |
| May 18, 2:51 AM EDT | Wind Advisory | DTX | 17 hr |
| May 21, 3:18 PM EDT | Special Weather Statement | DTX | 117 min |
| May 21, 7:02 PM EDT | Special Weather Statement | DTX | 28 min |
| Jun 4, 4:12 PM EDT | Special Weather Statement | DTX | 63 min |
| Jun 4, 4:49 PM EDT | Special Weather Statement | DTX | 56 min |
| Jun 15, 4:35 PM EDT | Special Weather Statement | DTX | 25 min |
| Jun 15, 5:10 PM EDT | Areal Flood Advisory | DTX | 3 hr |
| Jun 17, 8:23 AM EDT | Special Weather Statement | DTX | 67 min |
| Jun 17, 10:33 AM EDT | Special Weather Statement | DTX | 57 min |
| Jun 17, 6:05 PM EDT | Severe Thunderstorm Warning | DTX | 55 min |
| Jun 19, 4:44 PM EDT | Special Weather Statement | DTX | 61 min |
| Jun 19, 4:45 PM EDT | Special Weather Statement | DTX | 60 min |
| Jun 22, 10:01 PM EDT | Flood Watch | DTX | 8 hr |
| Jun 22, 10:23 PM EDT | Special Weather Statement | DTX | 37 min |
| Jun 24, 4:23 PM EDT | Special Weather Statement | DTX | 52 min |
| Jul 7, 6:50 PM EDT | Special Weather Statement | DTX | 55 min |
| Jul 12, 3:51 AM EDT | Flood Watch | DTX | 28 hr |
| Jul 13, 3:19 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 3:20 AM EDT | Beach Hazards Statement | DTX | 41 hr |
| Jul 23, 6:24 PM EDT | Special Weather Statement | DTX | 81 min |
| Jul 28, 3:59 AM EDT | Beach Hazards Statement | DTX | 18 hr |
| Aug 3, 3:06 PM EDT | Special Weather Statement | DTX | 24 min |
| Aug 11, 1:51 PM EDT | Severe Thunderstorm Warning | DTX | 54 min |
| Aug 11, 3:02 PM EDT | Severe Thunderstorm Warning | DTX | 21 min |
| Aug 11, 3:46 PM EDT | Severe Thunderstorm Warning | DTX | 37 min |
| Aug 17, 7:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 17, 8:16 PM EDT | Tornado Warning | DTX | 44 min |
| Aug 28, 9:26 PM EDT | Areal Flood Advisory | DTX | 3 hr |
| Aug 30, 12:10 AM EDT | Dense Fog Advisory | DTX | 10 hr |
| Aug 30, 3:46 PM EDT | Beach Hazards Statement | DTX | 56 hr |
| Aug 30, 3:46 PM EDT | Lakeshore Flood Advisory | DTX | 36 hr |
| Sep 4, 3:49 AM EDT | Beach Hazards Statement | DTX | 16 hr |
| Oct 7, 3:26 PM EDT | Wind Advisory | DTX | 12 hr |
| Oct 7, 10:49 PM EDT | Severe Thunderstorm Warning | DTX | 56 min |
| Oct 14, 1:56 PM EDT | Wind Advisory | DTX | 25 hr |
| Oct 15, 11:46 AM EDT | Special Weather Statement | DTX | 59 min |
| Oct 15, 12:35 PM EDT | Severe Thunderstorm Warning | DTX | 40 min |
| Dec 5, 3:57 AM EST | Wind Advisory | DTX | 15 hr |
| Dec 13, 3:44 AM EST | Winter Weather Advisory | DTX | 26 hr |
| Dec 21, 7:03 PM EST | Winter Weather Advisory | DTX | 15 hr |
| Dec 24, 4:19 AM EST | Winter Weather Advisory | DTX | 22 hr |
| Dec 25, 3:32 PM EST | Wind Chill Advisory | DTX | 18 hr |
| Dec 26, 2:58 PM EST | Wind Chill Advisory | DTX | 19 hr |
| Dec 30, 3:15 AM EST | Winter Weather Advisory | DTX | 19 hr |
| Dec 30, 2:45 PM EST | Wind Chill Advisory | DTX | 13 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 | 7 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 25 |
| Flooding | |
| Flood Watch | 4 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 1 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 8 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 3 |
| Wind Advisory | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Coast and beach | |
| Lakeshore Flood Advisory | 1 |
| Beach Hazards Statement | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.