Alert archive / Michigan / Mason County
Weather alerts in Mason County, Michigan, 2008
173 weather alerts in 2008, 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 2008. Tap one for its archive.
- Alerts
- 173
- Warnings
- 44
- Watches
- 32
- Advisories
- 45
- Busiest month
- June53 alerts
- Busiest day
- June 13, 200821 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 2 tornado warnings covering Mason County in 2008 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 9 minutes after it went out.
Mason County, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 100% | 9 min |
| Severe thunderstorm warnings | 14 | 5 | 64% | 7 | 71% | 10 min |
| Flash flood warnings | 1 | 1 | 0% | 6 | 100% | 356 min |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 16 | 3 | 81% | 36 | 19% | 18 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 129 | 74 | 43% | 265 | 75% | 31 min |
| NWS Grand Rapids, MI: flash flood warnings | 6 | 5 | 17% | 20 | 90% | 240 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 1, 10:38 AM EST | Lake Effect Snow Advisory | GRR | 22 hr |
| Jan 5, 6:32 PM EST | Dense Fog Advisory | GRR | 17 hr |
| Jan 7, 4:04 AM EST | Flood Watch | GRR | 41 hr |
| Jan 8, 4:39 PM EST | Wind Advisory | GRR | 12 hr |
| Jan 9, 4:47 PM EST | Winter Storm Watch | GRR | 23 hr |
| Jan 10, 7:57 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 17, 3:29 PM EST | Winter Storm Watch | GRR | 13 hr |
| Jan 17, 9:38 PM EST | Wind Advisory | GRR | 7 hr |
| Jan 18, 4:23 AM EST | Winter Weather Advisory | GRR | 54 hr |
| Jan 20, 2:59 PM EST | Winter Storm Watch | GRR | 13 hr |
| Jan 21, 3:46 AM EST | Winter Storm Warning | GRR | 35 hr |
| Jan 22, 4:12 PM EST | Lake Effect Snow Warning | GRR | 45 hr |
| Jan 22, 4:12 PM EST | Lake Effect Snow Advisory | GRR | 45 hr |
| Jan 28, 11:42 PM EST | Winter Storm Watch | GRR | 12 hr |
| Jan 29, 3:45 AM EST | Winter Storm Warning | GRR | 32 hr |
| Jan 29, 7:15 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 30, 12:19 PM EST | Blowing Snow Advisory | GRR | 6 hr |
| Feb 3, 8:12 PM EST | Winter Weather Advisory | GRR | 28 hr |
| Feb 4, 4:02 PM EST | Winter Storm Watch | GRR | 23 hr |
| Feb 4, 11:32 PM EST | Freezing Fog Advisory | GRR | 8 hr |
| Feb 5, 3:29 PM EST | Winter Storm Warning | GRR | 32 hr |
| Feb 6, 12:32 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 8, 4:26 PM EST | Winter Weather Advisory | GRR | 56 hr |
| Feb 14, 11:15 AM EST | Snow Advisory | GRR | 11 hr |
| Feb 14, 2:12 PM EST | Winter Storm Warning | GRR | 8 hr |
| Feb 16, 3:41 PM EST | Freezing Rain Advisory | GRR | 21 hr |
| Feb 18, 4:30 AM EST | Lake Effect Snow Warning | GRR | 55 hr |
| Feb 18, 4:30 AM EST | Lake Effect Snow Advisory | GRR | 48 hr |
| Feb 25, 7:48 AM EST | Freezing Rain Advisory | GRR | 6 hr |
| Feb 27, 2:54 AM EST | Lake Effect Snow Advisory | GRR | 28 hr |
| Feb 28, 3:38 AM EST | Winter Storm Watch | GRR | 12 hr |
| Feb 28, 3:18 PM EST | Snow Advisory | GRR | 24 hr |
| Mar 12, 2:03 PM EDT | Winter Weather Advisory | GRR | 14 hr |
| Mar 17, 2:55 PM EDT | Winter Weather Advisory | GRR | 20 hr |
| Mar 24, 3:05 PM EDT | Winter Weather Advisory | GRR | 21 hr |
| Mar 25, 4:34 AM EDT | Wind Advisory | GRR | 13 hr |
| Mar 31, 3:20 PM EDT | Wind Advisory | GRR | 24 hr |
| Apr 16, 12:28 PM EDT | Red Flag Warning | GRR | 10 hr |
| Apr 23, 11:27 AM EDT | Fire Weather Watch | GRR | 3 hr |
| Apr 23, 2:51 PM EDT | Red Flag Warning | GRR | 29 hr |
| Apr 25, 1:33 PM EDT | Special Weather Statement | GRR | 57 min |
| Apr 25, 7:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Apr 25, 8:38 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 25, 9:24 PM EDT | Severe Thunderstorm Warning | GRR | 51 min |
| Apr 29, 3:47 AM EDT | Freeze Warning | GRR | 28 hr |
| May 2, 4:30 PM EDT | Special Weather Statement | GRR | 90 min |
| May 2, 9:13 PM EDT | Tornado Watch | SPC | 3 hr |
| May 8, 1:51 PM EDT | Frost Advisory | GRR | 18 hr |
| May 13, 8:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 14, 3:17 PM EDT | Frost Advisory | GRR | 17 hr |
| May 18, 3:32 PM EDT | Frost Advisory | GRR | 16 hr |
| May 24, 11:06 AM EDT | Fire Weather Watch | GRR | 17 hr |
| May 25, 4:02 AM EDT | Red Flag Warning | GRR | 17 hr |
| May 25, 11:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| May 27, 2:11 AM EDT | Freeze Watch | GRR | 12 hr |
| May 27, 2:14 PM EDT | Freeze Warning | GRR | 18 hr |
| May 30, 11:09 PM EDT | Mesoscale Discussion | SPC | 66 min |
| May 30, 11:36 PM EDT | Special Weather Statement | GRR | 39 min |
| Jun 5, 2:38 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 5, 7:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 5, 9:02 AM EDT | Special Weather Statement | GRR | 88 min |
| Jun 5, 9:03 AM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 5, 9:05 AM EDT | Special Weather Statement | GRR | 85 min |
| Jun 6, 1:57 PM EDT | Special Weather Statement | GRR | 78 min |
| Jun 6, 2:18 PM EDT | Tornado Watch | SPC | 10 hr |
| Jun 6, 7:50 PM EDT | Special Weather Statement | GRR | 55 min |
| Jun 6, 9:25 PM EDT | Areal Flood Advisory | GRR | 191 days |
| Jun 7, 3:27 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 7, 7:33 PM EDT | Areal Flood Advisory | GRR | 191 days |
| Jun 7, 10:57 PM EDT | Areal Flood Advisory | GRR | 203 days |
| Jun 8, 3:27 AM EDT | Flood Watch | GRR | 48 hr |
| Jun 8, 11:50 AM EDT | Special Weather Statement | GRR | 55 min |
| Jun 8, 12:57 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 8, 1:06 PM EDT | Special Weather Statement | GRR | 54 min |
| Jun 8, 1:12 PM EDT | Severe Thunderstorm Warning | GRR | 48 min |
| Jun 8, 1:38 PM EDT | Severe Thunderstorm Warning | GRR | 52 min |
| Jun 8, 10:21 PM EDT | Areal Flood Warning | GRR | 36 hr |
| Jun 12, 9:12 PM EDT | Severe Thunderstorm Warning | GRR | 48 min |
| Jun 12, 9:16 PM EDT | Tornado Warning | GRR | 44 min |
| Jun 12, 9:21 PM EDT | Mesoscale Discussion | SPC | 24 min |
| Jun 12, 9:35 PM EDT | Tornado Watch | SPC | 4 hr |
| Jun 12, 10:00 PM EDT | Severe Thunderstorm Warning | GRR | 45 min |
| Jun 12, 10:07 PM EDT | Severe Thunderstorm Warning | GRR | 38 min |
| Jun 12, 10:17 PM EDT | Tornado Warning | GRR | 58 min |
| Jun 12, 10:22 PM EDT | Areal Flood Advisory | GRR | 2 hr |
| Jun 12, 10:44 PM EDT | Severe Thunderstorm Warning | GRR | 46 min |
| Jun 12, 10:55 PM EDT | Flash Flood Warning | GRR | 17 hr |
| Jun 12, 11:14 PM EDT | Severe Thunderstorm Warning | GRR | 61 min |
| Jun 12, 11:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jun 12, 11:58 PM EDT | Severe Thunderstorm Warning | GRR | 47 min |
| Jun 13, 12:33 AM EDT | Severe Thunderstorm Warning | GRR | 42 min |
| Jun 13, 1:04 AM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 13, 1:16 AM EDT | Severe Thunderstorm Warning | GRR | 29 min |
| Jun 13, 1:51 AM EDT | Special Weather Statement | GRR | 69 min |
| Jun 13, 1:57 AM EDT | Tornado Watch | SPC | 5 hr |
| Jun 13, 2:56 AM EDT | Special Weather Statement | GRR | 64 min |
| Jun 13, 3:07 AM EDT | River Flood Warning | GRR | 53 hr |
| Jun 13, 3:25 PM EDT | Areal Flood Warning | GRR | 24 hr |
| Jun 14, 2:10 PM EDT | Areal Flood Warning | GRR | 24 hr |
| Jun 14, 7:51 PM EDT | Special Weather Statement | GRR | 54 min |
| Jun 14, 8:07 PM EDT | Severe Thunderstorm Warning | GRR | 38 min |
| Jun 14, 8:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 14, 8:51 PM EDT | Special Weather Statement | GRR | 54 min |
| Jun 15, 1:38 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 15, 2:17 PM EDT | Areal Flood Warning | GRR | 24 hr |
| Jun 22, 11:36 AM EDT | Special Weather Statement | GRR | 54 min |
| Jun 28, 3:37 AM EDT | Special Weather Statement | GRR | 53 min |
| Jun 28, 11:44 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 4:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 5:42 PM EDT | Special Weather Statement | GRR | 63 min |
| Jul 2, 10:42 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 2, 11:09 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 2, 12:26 PM EDT | Special Weather Statement | GRR | 64 min |
| Jul 2, 12:35 PM EDT | Severe Thunderstorm Warning | GRR | 40 min |
| Jul 2, 1:10 PM EDT | Severe Thunderstorm Warning | GRR | 65 min |
| Jul 2, 2:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 2, 3:47 PM EDT | Special Weather Statement | GRR | 58 min |
| Jul 2, 4:08 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 2, 5:23 PM EDT | Lakeshore Flood Statement | GRR | 7 hr |
| Jul 2, 8:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 7, 3:15 AM EDT | Special Weather Statement | GRR | 90 min |
| Jul 7, 11:10 AM EDT | Special Weather Statement | GRR | 65 min |
| Jul 7, 8:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 16, 1:42 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 16, 4:33 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 17, 8:45 AM EDT | Special Weather Statement | GRR | 45 min |
| Aug 1, 1:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Aug 1, 2:37 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 6, 4:58 PM EDT | Special Weather Statement | GRR | 92 min |
| Aug 7, 2:06 PM EDT | Special Weather Statement | GRR | 114 min |
| Sep 9, 3:43 PM EDT | Frost Advisory | GRR | 16 hr |
| Sep 25, 1:03 AM EDT | Dense Fog Advisory | GRR | 9 hr |
| Oct 3, 11:37 AM EDT | Freeze Warning | GRR | 21 hr |
| Oct 25, 3:44 AM EDT | Wind Advisory | GRR | 40 hr |
| Oct 26, 2:26 PM EDT | Special Weather Statement | GRR | 64 min |
| Oct 26, 3:30 PM EDT | Special Weather Statement | GRR | 60 min |
| Oct 26, 4:36 PM EDT | Special Weather Statement | GRR | 84 min |
| Oct 26, 5:49 PM EDT | Special Weather Statement | GRR | 101 min |
| Nov 17, 4:22 AM EST | Lake Effect Snow Advisory | GRR | 21 hr |
| Nov 19, 2:45 AM EST | Lake Effect Snow Watch | GRR | 25 hr |
| Nov 20, 3:38 AM EST | Lake Effect Snow Warning | GRR | 33 hr |
| Nov 24, 5:04 AM EST | Winter Weather Advisory | GRR | 26 hr |
| Nov 29, 3:32 PM EST | Winter Storm Watch | GRR | 12 hr |
| Nov 30, 3:48 AM EST | Winter Storm Warning | GRR | 39 hr |
| Dec 1, 1:37 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 3, 3:41 AM EST | Winter Weather Advisory | GRR | 17 hr |
| Dec 5, 3:44 AM EST | Winter Storm Watch | GRR | 13 hr |
| Dec 5, 4:16 PM EST | Winter Storm Warning | GRR | 35 hr |
| Dec 7, 3:44 PM EST | Winter Storm Watch | GRR | 24 hr |
| Dec 8, 3:44 PM EST | Winter Storm Warning | GRR | 33 hr |
| Dec 12, 10:08 AM EST | Winter Weather Advisory | GRR | 5 hr |
| Dec 14, 4:01 PM EST | Wind Advisory | GRR | 22 hr |
| Dec 15, 2:37 AM EST | Winter Weather Advisory | GRR | 19 hr |
| Dec 16, 4:16 PM EST | Winter Storm Watch | GRR | 36 hr |
| Dec 18, 4:05 AM EST | Winter Storm Warning | GRR | 38 hr |
| Dec 19, 3:27 PM EST | Winter Storm Watch | GRR | 24 hr |
| Dec 20, 3:32 PM EST | Winter Storm Warning | GRR | 36 hr |
| Dec 22, 4:04 PM EST | Winter Storm Watch | GRR | 20 hr |
| Dec 23, 3:36 AM EST | Winter Weather Advisory | GRR | 43 hr |
| Dec 23, 11:36 AM EST | Winter Storm Warning | GRR | 35 hr |
| Dec 25, 3:32 PM EST | Flood Watch | GRR | 45 hr |
| Dec 25, 3:37 PM EST | Winter Weather Advisory | GRR | 21 hr |
| Dec 26, 9:53 AM EST | River Flood Warning | GRR | 6 days |
| Dec 26, 3:32 PM EST | Dense Fog Advisory | GRR | 27 hr |
| Dec 27, 4:14 AM EST | Wind Advisory | GRR | 22 hr |
| Dec 27, 10:44 AM EST | Areal Flood Warning | GRR | 47 hr |
| Dec 27, 4:27 PM EST | Winter Weather Advisory | GRR | 19 hr |
| Dec 27, 4:28 PM EST | Special Weather Statement | GRR | 77 min |
| Dec 28, 2:00 AM EST | High Wind Warning | GRR | 10 hr |
| Dec 28, 11:55 AM EST | Wind Advisory | GRR | 4 hr |
| Dec 29, 9:46 AM EST | Wind Advisory | GRR | 11 hr |
| Dec 30, 4:09 AM EST | Winter Weather Advisory | GRR | 24 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 archive20072009
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.