Alert archive / Michigan / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 642
The Storm Prediction Center issued this severe thunderstorm watch at Aug 23, 2007, 4:09 PM EDT for 14 counties in Indiana; 38 counties in Michigan; 9 counties in Ohio. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 23, 2007, 4:09 PM EDT (20:09 UTC)
- Expired
- Aug 24, 2007, 12:08 AM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 70 kt
All 61 counties
Allen County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Noble County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Bay County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Mecosta County, MI, Midland County, MI, Monroe County, MI, Montcalm County, MI, Oakland County, MI, Ottawa County, MI, Saginaw County, MI, Saint Clair County, MI, Saint Joseph County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Ottawa County, OH, Paulding County, OH, Sandusky County, OH, Williams County, OH, Wood County, OH
The radar
The Grand Rapids radar (KGRR), 40 km from the middle of the area, began a volume at 20:10 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 80%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
31 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 4:24 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot | 28 min |
| Aug 23, 4:30 PM EDT | Tornado Warning | GRR | Isabella | 30 min |
| Aug 23, 4:44 PM EDT | Severe Thunderstorm Warning | IWX | LaPorte, Marshall, Saint Joseph, Starke | 76 min |
| Aug 23, 5:12 PM EDT | Tornado Warning | IWX | LaPorte | 48 min |
| Aug 23, 5:17 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Kalamazoo, Van Buren | 88 min |
| Aug 23, 5:24 PM EDT | Severe Thunderstorm Warning | DTX | Bay, Saginaw | 40 min |
| Aug 23, 5:29 PM EDT | Tornado Warning | DTX | Bay | 34 min |
| Aug 23, 5:40 PM EDT | Severe Thunderstorm Warning | IWX | Elkhart | 53 min |
| Aug 23, 5:50 PM EDT | Tornado Warning | DTX | Tuscola | 55 min |
| Aug 23, 5:57 PM EDT | Severe Thunderstorm Warning | GRR | Ottawa | 69 min |
| Aug 23, 6:15 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Kent | 60 min |
| Aug 23, 6:16 PM EDT | Severe Thunderstorm Warning | IWX | LaGrange | 50 min |
| Aug 23, 6:27 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun, Eaton, Ionia | 67 min |
| Aug 23, 6:40 PM EDT | Severe Thunderstorm Warning | IWX | Steuben | 44 min |
| Aug 23, 6:40 PM EDT | Tornado Warning | DTX | Sanilac | 64 min |
| Aug 23, 6:43 PM EDT | Tornado Warning | DTX | Tuscola | 14 min |
| Aug 23, 6:53 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Ingham, Jackson | 65 min |
| Aug 23, 7:10 PM EDT | Severe Thunderstorm Warning | DTX | Livingston, Shiawassee, Washtenaw | 65 min |
| Aug 23, 7:13 PM EDT | Severe Thunderstorm Warning | IWX | Hillsdale | 42 min |
| Aug 23, 7:20 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 55 min |
| Aug 23, 7:36 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Oakland, Wayne | 54 min |
| Aug 23, 8:05 PM EDT | Severe Thunderstorm Warning | IWX | Berrien | 40 min |
| Aug 23, 8:14 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw | 39 min |
| Aug 23, 8:21 PM EDT | Severe Thunderstorm Warning | DTX | Macomb | 54 min |
| Aug 23, 8:31 PM EDT | Severe Thunderstorm Warning | DTX | Oakland, Wayne | 57 min |
| Aug 23, 8:46 PM EDT | Severe Thunderstorm Warning | IWX | LaPorte, Starke | 59 min |
| Aug 23, 8:47 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 34 min |
| Aug 23, 9:20 PM EDT | Severe Thunderstorm Warning | IWX | Saint Joseph | 39 min |
| Aug 23, 10:02 PM EDT | Severe Thunderstorm Warning | IWX | Elkhart, Kosciusko, Noble | 43 min |
| Aug 23, 10:21 PM EDT | Severe Thunderstorm Warning | IWX | LaPorte, Pulaski, Starke | 39 min |
| Aug 23, 10:55 PM EDT | Severe Thunderstorm Warning | IWX | Marshall | 20 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 8.2 hours before the alert went out and 148 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1330 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 8:21 PM EDT | Mesoscale Discussion | SPC | Jasper, Lake, LaPorte, Newton, Porter, Starke | 2 hr |
| Aug 23, 2:48 AM EDT | Mesoscale Discussion | SPC | DeKalb, LaGrange, Noble, Steuben, Whitley | 27 min |
| Aug 23, 11:36 AM EDT | Mesoscale Discussion | SPC | Lake | 114 min |
| Aug 23, 1:28 PM EDT | Severe Thunderstorm Watch | SPC | Benton, Jasper, Lake, Newton, Porter | 7 hr |
| Aug 23, 3:07 PM EDT | Mesoscale Discussion | SPC | Allen, Cass, DeKalb, Elkhart, Fulton, Huntington and 13 more | 83 min |
| Aug 23, 4:10 PM EDT | Mesoscale Discussion | SPC | Jasper, Lake, Newton | 95 min |
| Aug 23, 6:38 PM EDT | Mesoscale Discussion | SPC | DeKalb, Elkhart, Fulton, Jasper, Kosciusko, LaGrange and 11 more | 97 min |
| Aug 22, 8:19 PM EDT | Severe Thunderstorm Watch | SPC | Allegan, Barry, Clinton, Eaton, Genesee, Gratiot and 16 more | 4 hr |
| Aug 23, 12:01 AM EDT | Mesoscale Discussion | SPC | Clinton, Eaton, Genesee, Gratiot, Ingham, Lapeer and 8 more | 59 min |
| Aug 23, 11:17 AM EDT | Mesoscale Discussion | SPC | Carroll, Columbiana, Coshocton, Guernsey, Harrison, Holmes and 6 more | 88 min |
| Aug 23, 2:43 PM EDT | Severe Thunderstorm Watch | SPC | Ashland, Belmont, Carroll, Columbiana, Coshocton, Guernsey and 14 more | 6 hr |
| Aug 23, 5:30 PM EDT | Mesoscale Discussion | SPC | Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 10 more | 60 min |
Nearby
Severe Thunderstorm Watches in Michigan, 2007Severe Thunderstorm Watches in Indiana, 2007Severe Thunderstorm Watches in Ohio, 2007Every severe thunderstorm watch in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.