Alert archive / Michigan / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Michigan, 2009
130 severe thunderstorm warnings in 2009. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Severe Thunderstorm Warnings
- 130
- Busiest month
- June50 severe thunderstorm warnings
- Busiest day
- April 25, 200923 severe thunderstorm warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
65 of 130 severe thunderstorm warnings covering Michigan in 2009 had a qualifying storm report inside them; 151 of 215 hail, wind and damage reports fell inside a warning, on average 26 minutes after it went out.
Michigan, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 130 | 65 | 50% | 215 | 70% | 26 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Gaylord, MI: severe thunderstorm warnings | 18 | 6 | 67% | 17 | 59% | 16 min |
| NWS Marquette, MI: severe thunderstorm warnings | 14 | 3 | 79% | 9 | 44% | 13 min |
| NWS Northern Indiana: severe thunderstorm warnings | 59 | 25 | 58% | 90 | 77% | 26 min |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 40 | 22 | 45% | 85 | 62% | 24 min |
| NWS Detroit, MI: severe thunderstorm warnings | 49 | 28 | 43% | 96 | 82% | 30 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 | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 8:39 PM EDT | Severe Thunderstorm Warning | MQT | Dickinson, Iron | 36 min |
| Apr 24, 9:13 PM EDT | Severe Thunderstorm Warning | MQT | Dickinson, Marquette | 47 min |
| Apr 25, 1:16 AM EDT | Severe Thunderstorm Warning | APX | Mackinac | 59 min |
| Apr 25, 9:35 AM EDT | Severe Thunderstorm Warning | APX | Antrim, Crawford, Grand Traverse, Kalkaska, Otsego | 49 min |
| Apr 25, 1:13 PM EDT | Severe Thunderstorm Warning | GRR | Ingham, Jackson | 26 min |
| Apr 25, 1:15 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Livingston, Washtenaw | 60 min |
| Apr 25, 1:37 PM EDT | Severe Thunderstorm Warning | DTX | Oakland, Washtenaw, Wayne | 53 min |
| Apr 25, 1:42 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Shiawassee | 50 min |
| Apr 25, 2:04 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer, Macomb | 56 min |
| Apr 25, 2:21 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 54 min |
| Apr 25, 2:24 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot, Isabella, Mecosta, Montcalm | 50 min |
| Apr 25, 2:28 PM EDT | Severe Thunderstorm Warning | DTX | Sanilac | 47 min |
| Apr 25, 2:34 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Kent, Ottawa | 41 min |
| Apr 25, 2:57 PM EDT | Severe Thunderstorm Warning | DTX | Midland, Saginaw | 28 min |
| Apr 25, 4:30 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Calhoun, Eaton, Kalamazoo | 45 min |
| Apr 25, 4:39 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun, Kalamazoo | 36 min |
| Apr 25, 5:00 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun, Clinton, Eaton, Ingham, Jackson | 60 min |
| Apr 25, 5:27 PM EDT | Severe Thunderstorm Warning | DTX | Livingston, Shiawassee, Washtenaw | 93 min |
| Apr 25, 5:56 PM EDT | Severe Thunderstorm Warning | GRR | Ingham, Jackson | 22 min |
| Apr 25, 5:59 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Oakland | 68 min |
| Apr 25, 6:12 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Gratiot | 21 min |
| Apr 25, 6:21 PM EDT | Severe Thunderstorm Warning | DTX | Wayne | 71 min |
| Apr 25, 7:04 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Saint Clair | 41 min |
| May 6, 3:27 PM EDT | Severe Thunderstorm Warning | MQT | Dickinson | 63 min |
| May 7, 3:17 PM EDT | Severe Thunderstorm Warning | MQT | Alger, Schoolcraft | 43 min |
| May 7, 7:02 PM EDT | Severe Thunderstorm Warning | DTX | Huron, Sanilac | 88 min |
| May 13, 10:55 PM EDT | Severe Thunderstorm Warning | GRR | Oceana | 25 min |
| May 14, 12:21 AM EDT | Severe Thunderstorm Warning | IWX | Berrien, Cass | 54 min |
| May 21, 8:46 AM EDT | Severe Thunderstorm Warning | MQT | Dickinson, Iron, Marquette | 59 min |
| May 27, 4:07 PM EDT | Severe Thunderstorm Warning | DTX | Genesee | 53 min |
| May 27, 4:25 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 43 min |
| May 30, 2:24 PM EDT | Severe Thunderstorm Warning | APX | Alcona, Oscoda | 38 min |
| May 30, 4:39 PM EDT | Severe Thunderstorm Warning | APX | Iosco | 36 min |
| May 30, 4:54 PM EDT | Severe Thunderstorm Warning | APX | Iosco, Ogemaw | 35 min |
| Jun 8, 3:19 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Eaton, Ingham | 56 min |
| Jun 8, 3:54 PM EDT | Severe Thunderstorm Warning | GRR | Ingham | 51 min |
| Jun 8, 4:06 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 71 min |
| Jun 8, 5:06 PM EDT | Severe Thunderstorm Warning | GRR | Barry | 54 min |
| Jun 8, 5:59 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot, Montcalm | 61 min |
| Jun 8, 6:37 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw | 28 min |
| Jun 8, 6:42 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Ottawa, Van Buren | 63 min |
| Jun 8, 7:23 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Barry | 52 min |
| Jun 8, 7:25 PM EDT | Severe Thunderstorm Warning | DTX | Shiawassee | 40 min |
| Jun 8, 8:13 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 47 min |
| Jun 8, 8:16 PM EDT | Severe Thunderstorm Warning | DTX | Genesee | 44 min |
| Jun 8, 8:24 PM EDT | Severe Thunderstorm Warning | IWX | Branch, Hillsdale | 66 min |
| Jun 8, 8:40 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 52 min |
| Jun 8, 8:42 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer | 49 min |
| Jun 13, 3:58 PM EDT | Severe Thunderstorm Warning | MQT | Gogebic, Ontonagon | 62 min |
| Jun 13, 4:48 PM EDT | Severe Thunderstorm Warning | MQT | Gogebic, Iron | 57 min |
| Jun 14, 2:08 PM EDT | Severe Thunderstorm Warning | APX | Chippewa, Mackinac | 67 min |
| Jun 14, 6:54 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer | 66 min |
| Jun 19, 2:37 AM EDT | Severe Thunderstorm Warning | GRR | Allegan | 53 min |
| Jun 19, 3:23 AM EDT | Severe Thunderstorm Warning | IWX | Berrien, Cass | 52 min |
| Jun 19, 3:35 AM EDT | Severe Thunderstorm Warning | GRR | Allegan, Van Buren | 55 min |
| Jun 19, 4:04 AM EDT | Severe Thunderstorm Warning | GRR | Kalamazoo | 41 min |
| Jun 19, 4:14 AM EDT | Severe Thunderstorm Warning | IWX | Berrien, Cass, Saint Joseph | 61 min |
| Jun 19, 4:41 AM EDT | Severe Thunderstorm Warning | GRR | Calhoun | 49 min |
| Jun 19, 4:57 AM EDT | Severe Thunderstorm Warning | IWX | Branch, Hillsdale | 52 min |
| Jun 19, 5:40 AM EDT | Severe Thunderstorm Warning | IWX | Hillsdale | 49 min |
| Jun 19, 6:53 AM EDT | Severe Thunderstorm Warning | IWX | Berrien, Cass | 67 min |
| Jun 19, 8:36 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Ottawa | 39 min |
| Jun 19, 9:11 PM EDT | Severe Thunderstorm Warning | GRR | Allegan | 49 min |
| Jun 19, 9:24 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Eaton | 66 min |
| Jun 19, 9:34 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Van Buren | 30 min |
| Jun 19, 10:27 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Calhoun, Eaton | 63 min |
| Jun 19, 10:46 PM EDT | Severe Thunderstorm Warning | GRR | Ingham, Jackson | 59 min |
| Jun 24, 7:59 PM EDT | Severe Thunderstorm Warning | APX | Arenac, Iosco, Ogemaw | 61 min |
| Jun 24, 8:51 PM EDT | Severe Thunderstorm Warning | DTX | Midland | 30 min |
| Jun 25, 5:52 AM EDT | Severe Thunderstorm Warning | APX | Alcona, Oscoda | 53 min |
| Jun 25, 1:49 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Lapeer | 56 min |
| Jun 25, 1:56 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 64 min |
| Jun 25, 2:26 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 64 min |
| Jun 25, 2:36 PM EDT | Severe Thunderstorm Warning | GRR | Ingham | 20 min |
| Jun 25, 2:45 PM EDT | Severe Thunderstorm Warning | DTX | Macomb | 60 min |
| Jun 25, 2:55 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 65 min |
| Jun 25, 3:19 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 56 min |
| Jun 25, 3:34 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw, Wayne | 71 min |
| Jun 25, 3:47 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer | 29 min |
| Jun 25, 4:01 PM EDT | Severe Thunderstorm Warning | DTX | Monroe | 65 min |
| Jun 25, 4:45 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw | 45 min |
| Jun 25, 5:14 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 20 min |
| Jun 25, 6:22 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Lapeer, Tuscola | 38 min |
| Jun 25, 10:58 PM EDT | Severe Thunderstorm Warning | APX | Missaukee, Wexford | 20 min |
| Jul 5, 2:08 PM EDT | Severe Thunderstorm Warning | APX | Iosco | 46 min |
| Jul 10, 7:49 PM EDT | Severe Thunderstorm Warning | APX | Chippewa | 41 min |
| Jul 10, 11:48 PM EDT | Severe Thunderstorm Warning | APX | Mackinac | 42 min |
| Jul 15, 5:35 PM EDT | Severe Thunderstorm Warning | MQT | Alger, Luce, Schoolcraft | 55 min |
| Jul 20, 3:07 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair, Sanilac | 24 min |
| Jul 22, 11:57 AM EDT | Severe Thunderstorm Warning | GRR | Isabella, Mecosta | 63 min |
| Jul 22, 5:10 PM EDT | Severe Thunderstorm Warning | APX | Arenac, Gladwin, Ogemaw | 28 min |
| Jul 25, 9:20 AM EDT | Severe Thunderstorm Warning | GRR | Isabella, Mecosta | 42 min |
| Jul 28, 4:09 PM EDT | Severe Thunderstorm Warning | IWX | Berrien | 51 min |
| Jul 28, 5:15 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw | 60 min |
| Jul 28, 6:07 PM EDT | Severe Thunderstorm Warning | GRR | Ingham, Jackson | 15 min |
| Jul 28, 6:08 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 31 min |
| Aug 9, 1:33 AM EDT | Severe Thunderstorm Warning | GRR | Gratiot | 27 min |
| Aug 9, 1:40 AM EDT | Severe Thunderstorm Warning | DTX | Saginaw, Shiawassee | 27 min |
| Aug 9, 1:45 AM EDT | Severe Thunderstorm Warning | DTX | Lapeer, Macomb, Oakland, Saint Clair | 50 min |
| Aug 9, 2:01 AM EDT | Severe Thunderstorm Warning | MQT | Houghton, Ontonagon | 44 min |
| Aug 9, 2:38 AM EDT | Severe Thunderstorm Warning | MQT | Baraga, Houghton, Ontonagon | 67 min |
| Aug 9, 3:43 AM EDT | Severe Thunderstorm Warning | MQT | Marquette | 62 min |
| Aug 9, 4:12 AM EDT | Severe Thunderstorm Warning | MQT | Alger | 63 min |
| Aug 9, 4:21 AM EDT | Severe Thunderstorm Warning | MQT | Alger, Schoolcraft | 54 min |
| Aug 9, 3:38 PM EDT | Severe Thunderstorm Warning | APX | Presque Isle | 67 min |
| Aug 9, 4:00 PM EDT | Severe Thunderstorm Warning | APX | Alpena, Montmorency | 45 min |
| Aug 9, 6:01 PM EDT | Severe Thunderstorm Warning | GRR | Kent, Muskegon, Newaygo, Ottawa | 66 min |
| Aug 9, 6:45 PM EDT | Severe Thunderstorm Warning | GRR | Ionia, Kent, Mecosta, Montcalm, Muskegon, Newaygo and 1 more | 60 min |
| Aug 9, 7:10 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Barry, Calhoun, Clinton, Eaton, Ingham and 5 more | 65 min |
| Aug 9, 7:11 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 39 min |
| Aug 9, 7:33 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 72 min |
| Aug 9, 7:40 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Eaton, Gratiot, Ingham, Ionia, Isabella and 2 more | 65 min |
| Aug 9, 7:49 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun, Ingham, Jackson | 56 min |
| Aug 9, 8:23 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw | 53 min |
| Aug 9, 8:23 PM EDT | Severe Thunderstorm Warning | GRR | Ingham, Jackson | 26 min |
| Aug 9, 8:25 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Saint Clair | 65 min |
| Aug 9, 8:46 PM EDT | Severe Thunderstorm Warning | DTX | Livingston, Oakland, Wayne | 49 min |
| Aug 10, 4:39 PM EDT | Severe Thunderstorm Warning | MQT | Schoolcraft | 66 min |
| Aug 10, 8:48 PM EDT | Severe Thunderstorm Warning | APX | Benzie, Manistee | 72 min |
| Aug 10, 9:57 PM EDT | Severe Thunderstorm Warning | APX | Manistee, Wexford | 29 min |
| Aug 11, 12:27 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Saint Clair | 48 min |
| Aug 11, 5:17 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Wayne | 43 min |
| Aug 16, 3:41 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Barry, Ionia, Kent, Montcalm | 17 min |
| Aug 16, 4:41 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot, Ionia, Isabella, Montcalm | 37 min |
| Aug 16, 7:37 PM EDT | Severe Thunderstorm Warning | APX | Antrim, Crawford, Kalkaska, Otsego | 53 min |
| Aug 20, 2:32 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 43 min |
| Sep 27, 10:51 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Muskegon, Ottawa | 39 min |
| Sep 27, 11:31 PM EDT | Severe Thunderstorm Warning | IWX | Berrien, Cass | 59 min |
| Sep 28, 1:14 AM EDT | Severe Thunderstorm Warning | DTX | Bay, Midland, Saginaw | 46 min |
| Oct 6, 9:32 PM EDT | Severe Thunderstorm Warning | GRR | Clare, Isabella, Lake, Mason, Mecosta, Newaygo and 2 more | 35 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Ingham County12
- Allegan County11
- Livingston County10
- Oakland County9
- Jackson County8
- Washtenaw County7
- Lapeer County7
- Macomb County7
- Saint Clair County7
- Barry County7
- Calhoun County7
- Eaton County7
- Genesee County6
- Gratiot County6
- Isabella County6
- Mecosta County6
- Montcalm County6
- Ottawa County6
- Berrien County6
- Wayne County5
- Kent County5
- Clinton County5
- Cass County5
- Ionia County5
- Dickinson County4
- Shiawassee County4
- Saginaw County4
- Kalamazoo County4
- Alger County4
- Schoolcraft County4
- Iosco County4
- Van Buren County4
- Iron County3
- Marquette County3
- Mackinac County3
- Sanilac County3
- Midland County3
- Ogemaw County3
- Hillsdale County3
- Ontonagon County3
35 more counties
- Muskegon County3
- Newaygo County3
- Antrim County2
- Crawford County2
- Kalkaska County2
- Otsego County2
- Oceana County2
- Alcona County2
- Oscoda County2
- Branch County2
- Gogebic County2
- Chippewa County2
- Arenac County2
- Wexford County2
- Houghton County2
- Manistee County2
- Grand Traverse County1
- Lenawee County1
- Huron County1
- Saint Joseph County1
- Monroe County1
- Tuscola County1
- Missaukee County1
- Luce County1
- Gladwin County1
- Baraga County1
- Presque Isle County1
- Alpena County1
- Montmorency County1
- Benzie County1
- Bay County1
- Clare County1
- Lake County1
- Mason County1
- Osceola County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
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.