Alert archive / Michigan / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 408
The Storm Prediction Center issued this severe thunderstorm watch at May 31, 2011, 2:33 PM CDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 31, 2011, 2:33 PM CDT (19:33 UTC)
- Expired
- May 31, 2011, 9:56 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 113 counties
Champaign County, IL, Christian County, IL, Coles County, IL, Cook County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, McLean County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Shelby County, IL, Vermilion County, IL, Will County, IL, Woodford County, IL, Allen County, IN, Benton County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Parke County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White 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, Clare 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, Lake County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Mason County, MI, Mecosta County, MI, Midland County, MI, Monroe County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oakland County, MI, Oceana County, MI, Osceola 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, Paulding County, OH, Williams County, OH
The radar
The Grand Rapids radar (KGRR), 83 km from the middle of the area, began a volume at 19:36 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 90%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 4:10 PM CDT | Severe Thunderstorm Warning | IWX | Saint Joseph | 35 min |
| May 31, 4:38 PM CDT | Severe Thunderstorm Warning | GRR | Isabella, Kent, Montcalm | 56 min |
| May 31, 4:42 PM CDT | Severe Thunderstorm Warning | IWX | Cass, Saint Joseph | 33 min |
| May 31, 5:14 PM CDT | Severe Thunderstorm Warning | GRR | Isabella, Montcalm | 46 min |
| May 31, 5:24 PM CDT | Severe Thunderstorm Warning | DTX | Bay, Midland | 66 min |
| May 31, 5:30 PM CDT | Tornado Warning | GRR | Isabella | 19 min |
| May 31, 5:33 PM CDT | Tornado Warning | DTX | Midland | 57 min |
| May 31, 5:35 PM CDT | Severe Thunderstorm Warning | GRR | Ionia, Montcalm | 40 min |
| May 31, 5:48 PM CDT | Severe Thunderstorm Warning | GRR | Ingham | 42 min |
| May 31, 6:06 PM CDT | Severe Thunderstorm Warning | DTX | Livingston, Shiawassee | 33 min |
| May 31, 6:10 PM CDT | Tornado Warning | DTX | Bay, Midland | 35 min |
| May 31, 6:25 PM CDT | Severe Thunderstorm Warning | DTX | Bay, Midland, Saginaw | 65 min |
| May 31, 7:15 PM CDT | Severe Thunderstorm Warning | DTX | Huron, Tuscola | 75 min |
| May 31, 7:25 PM CDT | Severe Thunderstorm Warning | DTX | Genesee, Saginaw, Shiawassee | 50 min |
| May 31, 7:52 PM CDT | Severe Thunderstorm Warning | DTX | Huron, Sanilac, Tuscola | 43 min |
| May 31, 7:59 PM CDT | Tornado Warning | DTX | Huron | 11 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, 7.6 hours before the alert went out and 233 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
- 1647 J/kg
- Mixed-layer CIN
- -247 J/kg
- Mixed-layer LCL
- 1517 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -82 m²/s²
- 0-3 km storm-relative helicity
- -60 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 |
|---|---|---|---|---|
| May 31, 12:59 PM CDT | Mesoscale Discussion | SPC | Adams, Boone, Brown, Bureau, Calhoun, Cass and 49 more | 3 hr |
| May 31, 6:26 PM CDT | Mesoscale Discussion | SPC | Champaign, Coles, DeWitt, Douglas, Edgar, Ford and 8 more | 2 hr |
| May 31, 12:00 PM CDT | Mesoscale Discussion | SPC | Alger, Alpena, Antrim, Baraga, Benzie, Charlevoix and 35 more | 3 hr |
| May 31, 12:56 PM CDT | Severe Thunderstorm Watch | SPC | Alcona, Alger, Alpena, Antrim, Arenac, Baraga and 30 more | 8 hr |
| May 31, 3:07 PM CDT | Mesoscale Discussion | SPC | Carroll, Columbiana, Coshocton, Cuyahoga, Geauga, Holmes and 8 more | 113 min |
Nearby
Severe Thunderstorm Watches in Michigan, 2011Severe Thunderstorm Watches in Indiana, 2011Severe Thunderstorm Watches in Illinois, 2011Every severe thunderstorm watch in 2011
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.