Alert archive / Michigan / Mason County
Weather alerts in Mason County, Michigan, 2010
87 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Mason County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 87
- Warnings
- 21
- Watches
- 16
- Advisories
- 27
- Busiest month
- April14 alerts
- Busiest day
- September 21, 20104 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Mason County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 4 | 2 | 50% | 3 | 67% | 16 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 31 | 4 | 87% | 8 | 50% | 20 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 91 | 47 | 48% | 186 | 70% | 26 min |
| NWS Grand Rapids, MI: flash flood warnings | 8 | 5 | 38% | 18 | 78% | 61 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 5, 8:14 PM EST | Freezing Rain Advisory | GRR | 7 hr |
| Feb 8, 4:05 PM EST | Winter Weather Advisory | GRR | 42 hr |
| Feb 17, 3:12 AM EST | Winter Weather Advisory | GRR | 8 hr |
| Feb 20, 3:21 PM EST | Winter Storm Watch | GRR | 24 hr |
| Feb 21, 3:50 PM EST | Winter Weather Advisory | GRR | 21 hr |
| Feb 23, 8:58 PM EST | Lake Effect Snow Advisory | GRR | 6 hr |
| Feb 24, 3:15 AM EST | Lake Effect Snow Warning | GRR | 16 hr |
| Feb 26, 2:50 PM EST | Winter Weather Advisory | GRR | 14 hr |
| Mar 8, 6:33 PM EST | Dense Fog Advisory | GRR | 10 hr |
| Mar 11, 10:03 PM EST | River Flood Advisory | GRR | 5 days |
| Mar 12, 1:44 AM EST | Areal Flood Advisory | GRR | 58 hr |
| Mar 31, 3:37 PM EDT | Fire Weather Watch | GRR | 36 hr |
| Apr 2, 3:38 AM EDT | Red Flag Warning | GRR | 16 hr |
| Apr 6, 11:54 PM EDT | Severe Thunderstorm Warning | GRR | 36 min |
| Apr 7, 1:10 AM EDT | Special Weather Statement | GRR | 65 min |
| Apr 15, 4:47 AM EDT | Red Flag Warning | GRR | 15 hr |
| Apr 16, 3:35 PM EDT | Freeze Watch | GRR | 24 hr |
| Apr 17, 3:15 PM EDT | Freeze Warning | GRR | 19 hr |
| Apr 18, 2:09 PM EDT | Freeze Warning | GRR | 18 hr |
| Apr 19, 1:51 PM EDT | Freeze Warning | GRR | 18 hr |
| Apr 21, 3:02 AM EDT | Freeze Watch | GRR | 13 hr |
| Apr 21, 3:41 PM EDT | Freeze Warning | GRR | 17 hr |
| Apr 22, 3:11 PM EDT | Freeze Warning | GRR | 18 hr |
| Apr 27, 3:18 AM EDT | Freeze Watch | GRR | 11 hr |
| Apr 27, 2:07 PM EDT | Freeze Warning | GRR | 18 hr |
| Apr 28, 3:47 PM EDT | Freeze Warning | GRR | 16 hr |
| Apr 30, 9:48 PM EDT | Severe Thunderstorm Warning | GRR | 27 min |
| Apr 30, 10:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| May 8, 3:36 PM EDT | Freeze Warning | GRR | 16 hr |
| May 9, 10:53 AM EDT | Freeze Warning | GRR | 21 hr |
| May 23, 3:50 AM EDT | Dense Fog Advisory | GRR | 4 hr |
| May 31, 7:45 AM EDT | Special Weather Statement | GRR | 60 min |
| Jun 15, 8:57 PM EDT | Special Weather Statement | GRR | 2 hr |
| Jun 15, 9:39 PM EDT | Areal Flood Advisory | GRR | 10 hr |
| Jun 18, 5:51 PM EDT | Flash Flood Watch | GRR | 10 hr |
| Jun 21, 11:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jun 23, 3:47 AM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 23, 7:26 AM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 23, 7:40 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 27, 2:16 AM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 27, 5:03 AM EDT | Special Weather Statement | GRR | 57 min |
| Jun 27, 2:35 PM EDT | Areal Flood Advisory | GRR | 6 hr |
| Jul 7, 10:45 AM EDT | Areal Flood Advisory | GRR | 5 hr |
| Jul 14, 6:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jul 14, 10:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 18, 12:45 PM EDT | Special Weather Statement | GRR | 45 min |
| Jul 19, 10:49 PM EDT | Flood Watch | GRR | 7 hr |
| Jul 22, 4:05 PM EDT | Flash Flood Watch | GRR | 12 hr |
| Aug 8, 3:34 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 8, 6:02 AM EDT | Special Weather Statement | GRR | 58 min |
| Aug 10, 3:26 AM EDT | Dense Fog Advisory | GRR | 6 hr |
| Aug 11, 7:31 AM EDT | Special Weather Statement | GRR | 119 min |
| Aug 20, 6:26 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Aug 20, 6:41 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 20, 7:57 PM EDT | Special Weather Statement | GRR | 63 min |
| Aug 20, 9:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Sep 2, 9:35 PM EDT | Special Weather Statement | GRR | 55 min |
| Sep 3, 10:18 AM EDT | Wind Advisory | GRR | 18 hr |
| Sep 6, 2:45 PM EDT | Special Weather Statement | GRR | 60 min |
| Sep 6, 3:43 PM EDT | Wind Advisory | GRR | 36 hr |
| Sep 21, 12:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 21, 5:25 PM EDT | Severe Thunderstorm Warning | GRR | 50 min |
| Sep 21, 5:53 PM EDT | Severe Thunderstorm Warning | GRR | 67 min |
| Sep 21, 9:19 PM EDT | Areal Flood Advisory | GRR | 4 hr |
| Sep 23, 4:14 PM EDT | Wind Advisory | GRR | 28 hr |
| Sep 26, 2:53 PM EDT | Frost Advisory | GRR | 18 hr |
| Oct 2, 7:45 PM EDT | Frost Advisory | GRR | 13 hr |
| Oct 3, 3:07 PM EDT | Freeze Warning | GRR | 18 hr |
| Oct 4, 3:20 PM EDT | Frost Advisory | GRR | 18 hr |
| Oct 8, 3:37 AM EDT | Red Flag Warning | GRR | 16 hr |
| Oct 15, 3:47 PM EDT | Frost Advisory | GRR | 17 hr |
| Oct 18, 4:02 PM EDT | Frost Advisory | GRR | 17 hr |
| Oct 21, 2:59 PM EDT | Freeze Warning | GRR | 18 hr |
| Oct 24, 4:12 PM EDT | High Wind Watch | GRR | 23 hr |
| Oct 25, 3:37 PM EDT | High Wind Warning | GRR | 58 hr |
| Oct 26, 4:28 AM EDT | Tornado Watch | SPC | 8 hr |
| Oct 26, 9:06 AM EDT | Special Weather Statement | GRR | 54 min |
| Oct 26, 11:04 AM EDT | Tornado Watch | SPC | 4 hr |
| Nov 22, 4:49 PM EST | Mesoscale Discussion | SPC | 86 min |
| Nov 22, 6:13 PM EST | Tornado Watch | SPC | 4 hr |
| Nov 24, 2:09 PM EST | Winter Weather Advisory | GRR | 14 hr |
| Dec 1, 10:20 AM EST | Lake Effect Snow Advisory | GRR | 12 hr |
| Dec 4, 4:24 PM EST | Lake Effect Snow Advisory | GRR | 71 hr |
| Dec 10, 4:20 PM EST | Winter Storm Watch | GRR | 24 hr |
| Dec 11, 4:04 PM EST | Winter Storm Warning | GRR | 50 hr |
| Dec 13, 5:54 PM EST | Winter Weather Advisory | GRR | 10 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 archive20092011
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.