Alert archive / Michigan / Grand Traverse County
Weather alerts in Grand Traverse County, Michigan, 2020
73 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Grand Traverse County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 73
- Warnings
- 21
- Watches
- 8
- Advisories
- 25
- Busiest month
- January11 alerts
- Busiest day
- June 10, 20204 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Grand Traverse County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 1 | 83% | 0 | ||
| Flash flood warnings | 4 | 2 | 50% | 3 | 100% | 11 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Gaylord, MI: tornado warnings | 2 | 0 | 100% | 0 | ||
| NWS Gaylord, MI: severe thunderstorm warnings | 64 | 20 | 69% | 59 | 59% | 19 min |
| NWS Gaylord, MI: flash flood warnings | 15 | 4 | 73% | 6 | 83% | 37 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 4, 2:19 AM EST | Winter Weather Advisory | APX | 22 hr |
| Jan 7, 9:43 AM EST | Snow Squall Warning | APX | 92 min |
| Jan 7, 10:38 AM EST | Snow Squall Warning | APX | 52 min |
| Jan 8, 4:00 PM EST | Winter Weather Advisory | APX | 33 hr |
| Jan 9, 3:43 PM EST | Winter Storm Watch | APX | 45 hr |
| Jan 10, 3:06 PM EST | Winter Storm Warning | APX | 38 hr |
| Jan 10, 3:10 PM EST | Lakeshore Flood Advisory | APX | 36 hr |
| Jan 10, 10:48 PM EST | Winter Weather Advisory | APX | 11 hr |
| Jan 16, 4:14 PM EST | Winter Storm Watch | APX | 11 hr |
| Jan 17, 3:29 AM EST | Winter Weather Advisory | APX | 54 hr |
| Jan 18, 12:49 PM EST | Lakeshore Flood Advisory | APX | 27 hr |
| Feb 9, 3:15 AM EST | Winter Weather Advisory | APX | 21 hr |
| Feb 12, 12:23 PM EST | Lakeshore Flood Advisory | APX | 27 hr |
| Feb 17, 3:43 AM EST | Winter Weather Advisory | APX | 35 hr |
| Feb 27, 3:27 AM EST | Winter Weather Advisory | APX | 48 hr |
| Mar 5, 4:48 PM EST | Lakeshore Flood Advisory | APX | 23 hr |
| Apr 7, 4:55 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 11, 4:56 PM EDT | High Wind Watch | APX | 23 hr |
| Apr 12, 3:38 PM EDT | Wind Advisory | APX | 32 hr |
| May 16, 2:45 PM EDT | Flood Watch | APX | 56 hr |
| May 26, 3:16 PM EDT | Severe Thunderstorm Warning | APX | 29 min |
| May 26, 3:31 PM EDT | Special Weather Statement | APX | 59 min |
| May 26, 8:51 PM EDT | Severe Thunderstorm Warning | APX | 39 min |
| May 28, 1:47 PM EDT | Flash Flood Warning | APX | 3 hr |
| May 28, 2:24 PM EDT | Special Weather Statement | APX | 3 hr |
| May 28, 4:20 PM EDT | Areal Flood Warning | APX | 20 hr |
| May 30, 3:24 PM EDT | Frost Advisory | APX | 17 hr |
| Jun 9, 4:10 AM EDT | Wind Advisory | APX | 32 hr |
| Jun 10, 12:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 10, 5:42 PM EDT | Special Weather Statement | APX | 33 min |
| Jun 10, 6:23 PM EDT | Special Weather Statement | APX | 37 min |
| Jun 10, 7:02 PM EDT | Flash Flood Warning | APX | 90 min |
| Jul 15, 3:55 PM EDT | Special Weather Statement | APX | 50 min |
| Jul 15, 4:05 PM EDT | Severe Thunderstorm Warning | APX | 55 min |
| Jul 18, 9:45 AM EDT | Special Weather Statement | APX | 60 min |
| Jul 18, 10:30 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 18, 11:25 AM EDT | Flash Flood Warning | APX | 57 min |
| Jul 19, 4:22 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 19, 4:52 AM EDT | Special Weather Statement | APX | 53 min |
| Jul 19, 6:07 AM EDT | Severe Thunderstorm Warning | APX | 53 min |
| Jul 19, 6:35 AM EDT | Flash Flood Warning | APX | 3 hr |
| Jul 26, 6:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 8, 9:00 AM EDT | Special Weather Statement | APX | 2 hr |
| Aug 8, 10:00 AM EDT | Special Weather Statement | APX | 60 min |
| Aug 8, 1:33 PM EDT | Special Weather Statement | APX | 57 min |
| Aug 10, 4:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 10, 8:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 15, 2:55 PM EDT | Special Weather Statement | APX | 35 min |
| Sep 6, 9:38 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 17, 3:17 AM EDT | Freeze Warning | APX | 29 hr |
| Sep 18, 9:37 AM EDT | Freeze Warning | APX | 23 hr |
| Sep 19, 11:50 AM EDT | Frost Advisory | APX | 21 hr |
| Sep 26, 9:38 AM EDT | Severe Thunderstorm Warning | APX | 37 min |
| Oct 1, 3:41 PM EDT | Frost Advisory | APX | 16 hr |
| Oct 2, 10:52 AM EDT | Freeze Warning | APX | 21 hr |
| Oct 13, 5:06 PM EDT | Special Weather Statement | APX | 54 min |
| Oct 22, 10:37 PM EDT | Flood Watch | APX | 16 hr |
| Oct 22, 11:35 PM EDT | Areal Flood Warning | APX | 15 hr |
| Oct 30, 3:38 PM EDT | Lakeshore Flood Warning | APX | 56 hr |
| Oct 31, 4:18 AM EDT | Wind Advisory | APX | 40 hr |
| Oct 31, 2:54 PM EDT | Winter Weather Advisory | APX | 29 hr |
| Nov 10, 2:07 PM EST | Wind Advisory | APX | 20 hr |
| Nov 10, 7:22 PM EST | Severe Thunderstorm Warning | APX | 38 min |
| Nov 14, 4:42 AM EST | Wind Advisory | APX | 23 hr |
| Nov 15, 4:11 AM EST | High Wind Warning | APX | 21 hr |
| Nov 15, 9:39 PM EST | Wind Advisory | APX | 9 hr |
| Nov 24, 4:03 AM EST | Winter Weather Advisory | APX | 24 hr |
| Nov 30, 3:57 AM EST | Lakeshore Flood Advisory | APX | 55 hr |
| Dec 10, 4:05 PM EST | Winter Storm Watch | APX | 23 hr |
| Dec 11, 2:43 PM EST | Winter Storm Warning | APX | 30 hr |
| Dec 12, 10:01 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 23, 3:57 PM EST | Winter Weather Advisory | APX | 43 hr |
| Dec 29, 3:04 AM EST | Winter Weather Advisory | APX | 33 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 | 6 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 7 |
| Special Weather Statement | 12 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 4 |
| Flood Watch | 2 |
| Winter | |
| Snow Squall Warning | 2 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 11 |
| Cold | |
| Freeze Warning | 3 |
| Frost Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 6 |
| Coast and beach | |
| Lakeshore Flood Warning | 1 |
| Lakeshore Flood Advisory | 5 |
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.