Alert archive / Michigan / Isabella County
Weather alerts in Isabella County, Michigan, 2011
136 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Isabella County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 136
- Warnings
- 24
- Watches
- 17
- Advisories
- 37
- Busiest month
- April30 alerts
- Busiest day
- April 4, 20117 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Isabella County in 2011 had a tornado report inside them.
Isabella County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 12 | 5 | 58% | 10 | 100% | 24 min |
| Flash flood warnings | 1 | 1 | 0% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Rapids, MI: tornado warnings | 13 | 1 | 92% | 3 | 33% | 8 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 124 | 64 | 48% | 242 | 62% | 30 min |
| NWS Grand Rapids, MI: flash flood warnings | 21 | 8 | 62% | 27 | 56% | 113 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 3, 4:17 PM EST | Winter Weather Advisory | GRR | 24 hr |
| Jan 17, 10:28 AM EST | Winter Weather Advisory | GRR | 24 hr |
| Jan 23, 10:44 PM EST | Wind Chill Advisory | GRR | 8 hr |
| Jan 24, 11:17 AM EST | Winter Weather Advisory | GRR | 12 hr |
| Jan 28, 3:54 AM EST | Winter Weather Advisory | GRR | 30 hr |
| Jan 30, 5:38 AM EST | Winter Storm Watch | GRR | 46 hr |
| Feb 1, 3:39 AM EST | Winter Storm Warning | GRR | 28 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, 7:19 AM EST | Winter Weather Advisory | GRR | 12 hr |
| Feb 18, 3:44 AM EST | Wind Advisory | GRR | 20 hr |
| Feb 18, 3:54 PM EST | Winter Storm Watch | GRR | 24 hr |
| Feb 18, 10:02 PM EST | River Flood Advisory | GRR | 19 hr |
| Feb 19, 4:09 PM EST | Winter Storm Warning | GRR | 48 hr |
| Feb 24, 7:45 AM EST | Special Weather Statement | GRR | 2 hr |
| Feb 27, 2:07 AM EST | Special Weather Statement | GRR | 113 min |
| Feb 27, 3:58 PM EST | Winter Weather Advisory | GRR | 17 hr |
| Feb 28, 12:04 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Mar 4, 4:22 AM EST | Winter Weather Advisory | GRR | 29 hr |
| Mar 4, 5:36 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 5, 10:19 AM EST | Special Weather Statement | GRR | 116 min |
| Mar 8, 2:51 PM EST | Winter Weather Advisory | GRR | 25 hr |
| Mar 9, 9:45 PM EST | Dense Fog Advisory | GRR | 6 hr |
| Mar 21, 4:06 AM EDT | Winter Storm Watch | GRR | 13 hr |
| Mar 21, 4:49 PM EDT | Winter Storm Warning | GRR | 51 hr |
| Mar 22, 9:57 PM EDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 24, 6:58 AM EDT | Special Weather Statement | GRR | 2 hr |
| Apr 3, 10:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 3, 11:11 PM EDT | Special Weather Statement | GRR | 64 min |
| Apr 4, 12:02 AM EDT | Special Weather Statement | GRR | 58 min |
| Apr 4, 2:53 AM EDT | Mesoscale Discussion | SPC | 97 min |
| Apr 4, 3:47 AM EDT | Special Weather Statement | GRR | 58 min |
| Apr 4, 11:12 AM EDT | River Flood Advisory | GRR | 5 days |
| Apr 4, 5:44 PM EDT | River Flood Warning | GRR | 27 hr |
| Apr 10, 5:22 AM EDT | Special Weather Statement | GRR | 53 min |
| Apr 10, 6:07 AM EDT | Severe Thunderstorm Warning | GRR | 38 min |
| Apr 10, 6:45 AM EDT | Severe Thunderstorm Warning | GRR | 45 min |
| Apr 10, 8:00 PM EDT | Special Weather Statement | GRR | 60 min |
| Apr 11, 12:03 AM EDT | Mesoscale Discussion | SPC | 87 min |
| Apr 11, 1:37 AM EDT | Special Weather Statement | GRR | 53 min |
| Apr 16, 4:34 PM EDT | Wind Advisory | GRR | 25 hr |
| Apr 19, 2:27 PM EDT | Winter Weather Advisory | GRR | 13 hr |
| Apr 19, 7:22 PM EDT | Special Weather Statement | GRR | 38 min |
| Apr 19, 8:09 PM EDT | Special Weather Statement | GRR | 51 min |
| Apr 19, 9:08 PM EDT | Special Weather Statement | GRR | 52 min |
| Apr 19, 10:11 PM EDT | Special Weather Statement | GRR | 49 min |
| Apr 20, 10:39 PM EDT | River Flood Advisory | GRR | 12 hr |
| Apr 22, 11:14 PM EDT | Special Weather Statement | GRR | 61 min |
| Apr 26, 3:02 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 26, 3:21 PM EDT | Flood Watch | GRR | 44 hr |
| Apr 26, 5:44 PM EDT | Severe Thunderstorm Warning | GRR | 46 min |
| Apr 26, 7:04 PM EDT | River Flood Advisory | GRR | 15 hr |
| Apr 26, 7:25 PM EDT | Severe Thunderstorm Warning | GRR | 50 min |
| Apr 26, 8:14 PM EDT | Severe Thunderstorm Warning | GRR | 20 min |
| Apr 26, 8:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Apr 27, 8:43 AM EDT | River Flood Warning | GRR | 4 days |
| Apr 27, 2:39 PM EDT | Areal Flood Advisory | GRR | 4 days |
| Apr 30, 8:48 PM EDT | River Flood Advisory | GRR | 3 days |
| May 6, 2:18 PM EDT | Special Weather Statement | GRR | 57 min |
| May 10, 2:40 AM EDT | Special Weather Statement | GRR | 2 hr |
| May 11, 2:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| May 11, 11:13 PM EDT | Special Weather Statement | GRR | 92 min |
| May 15, 2:40 PM EDT | Freeze Warning | GRR | 17 hr |
| May 19, 9:58 PM EDT | Dense Fog Advisory | GRR | 14 hr |
| May 23, 1:14 AM EDT | Special Weather Statement | GRR | 61 min |
| May 23, 12:10 PM EDT | Special Weather Statement | GRR | 65 min |
| May 25, 9:06 AM EDT | Flood Watch | GRR | 33 hr |
| May 31, 3:33 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 31, 5:38 PM EDT | Severe Thunderstorm Warning | GRR | 56 min |
| May 31, 6:14 PM EDT | Severe Thunderstorm Warning | GRR | 46 min |
| May 31, 6:30 PM EDT | Tornado Warning | GRR | 19 min |
| May 31, 7:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 1, 10:16 AM EDT | Wind Advisory | GRR | 11 hr |
| Jun 8, 12:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 8, 10:39 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 8, 11:35 PM EDT | Severe Thunderstorm Warning | GRR | 85 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, 7:59 PM EDT | Severe Thunderstorm Warning | GRR | 91 min |
| Jun 21, 8:05 PM EDT | Areal Flood Advisory | GRR | 15 hr |
| Jun 21, 8:44 PM EDT | Flash Flood Warning | GRR | 15 hr |
| Jun 22, 11:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 22, 12:12 PM EDT | Special Weather Statement | GRR | 93 min |
| Jun 22, 3:38 PM EDT | Special Weather Statement | GRR | 67 min |
| Jul 2, 2:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 2, 2:24 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 11, 6:37 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 11, 8:10 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 11, 8:39 AM EDT | Severe Thunderstorm Warning | GRR | 51 min |
| Jul 18, 1:51 AM EDT | Special Weather Statement | GRR | 69 min |
| Jul 18, 1:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 18, 1:37 PM EDT | Special Weather Statement | GRR | 53 min |
| Jul 18, 4:07 PM EDT | Excessive Heat Watch | GRR | 12 hr |
| Jul 19, 4:00 AM EDT | Excessive Heat Warning | GRR | 65 hr |
| Jul 19, 4:00 AM EDT | Heat Advisory | GRR | 16 hr |
| Jul 19, 4:30 PM EDT | Excessive Heat Watch | GRR | 11 hr |
| Jul 24, 7:27 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Aug 1, 2:03 AM EDT | Special Weather Statement | GRR | 27 min |
| Aug 1, 3:47 AM EDT | Mesoscale Discussion | SPC | 58 min |
| Aug 2, 11:26 AM EDT | Flash Flood Watch | GRR | 15 hr |
| Aug 2, 2:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 2, 6:22 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 7, 3:53 AM EDT | Dense Fog Advisory | GRR | 5 hr |
| Aug 9, 5:10 AM EDT | Dense Fog Advisory | GRR | 4 hr |
| Aug 9, 11:43 AM EDT | Special Weather Statement | GRR | 2 hr |
| Aug 9, 1:10 PM EDT | Special Weather Statement | GRR | 95 min |
| Aug 20, 10:05 AM EDT | Special Weather Statement | GRR | 55 min |
| Aug 24, 6:00 PM EDT | Tornado Watch | SPC | 5 hr |
| Aug 24, 7:01 PM EDT | Special Weather Statement | GRR | 74 min |
| Aug 24, 8:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 2, 1:53 AM EDT | Special Weather Statement | GRR | 52 min |
| Sep 2, 3:04 AM EDT | Special Weather Statement | GRR | 56 min |
| Sep 2, 4:20 AM EDT | Heat Advisory | GRR | 13 hr |
| Sep 3, 6:53 AM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 3, 7:22 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 3, 8:35 AM EDT | Severe Thunderstorm Warning | GRR | 38 min |
| Sep 3, 9:34 AM EDT | Severe Thunderstorm Warning | GRR | 56 min |
| Sep 15, 4:15 AM EDT | Frost Advisory | GRR | 29 hr |
| Sep 15, 2:43 PM EDT | Freeze Warning | GRR | 18 hr |
| Sep 16, 3:46 PM EDT | Frost Advisory | GRR | 17 hr |
| Sep 19, 10:39 PM EDT | Dense Fog Advisory | GRR | 11 hr |
| Sep 29, 4:35 AM EDT | Dense Fog Advisory | GRR | 4 hr |
| Sep 29, 6:57 PM EDT | Special Weather Statement | GRR | 63 min |
| Oct 1, 4:15 AM EDT | Frost Advisory | GRR | 29 hr |
| Oct 1, 4:07 PM EDT | Freeze Warning | GRR | 17 hr |
| Oct 15, 3:44 AM EDT | Wind Advisory | GRR | 14 hr |
| Oct 19, 4:20 AM EDT | Wind Advisory | GRR | 33 hr |
| Oct 21, 2:42 PM EDT | Freeze Warning | GRR | 19 hr |
| Oct 24, 12:08 AM EDT | Special Weather Statement | GRR | 52 min |
| Nov 9, 3:48 AM EST | Wind Advisory | GRR | 16 hr |
| Dec 17, 10:20 PM EST | Winter Weather Advisory | GRR | 6 hr |
| Dec 27, 10:11 AM EST | Special Weather Statement | GRR | 49 min |
| Dec 27, 10:19 AM EST | Special Weather Statement | GRR | 41 min |
| Dec 29, 7:57 AM EST | Winter Weather Advisory | GRR | 5 hr |
| Dec 29, 4:06 PM EST | Winter Weather Advisory | GRR | 21 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 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.