Alert archive / Michigan / Severe Thunderstorm Watches in 2008

Severe Thunderstorm Watch 487

June 8, 200845 counties in Michigan

The Storm Prediction Center issued this severe thunderstorm watch at Jun 8, 2008, 12:57 PM EDT for 45 counties in Michigan. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 8, 2008, 12:57 PM EDT (16:57 UTC)
Expired: Jun 8, 2008, 6:26 PM EDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 45 counties

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

The radar

The Grand Rapids radar (KGRR), 20 km from the middle of the area, began a volume at 16:58 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: 50%
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: 80%

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
Jun 8, 1:12 PM EDT	Severe Thunderstorm Warning	GRR	Mason, Oceana	48 min
Jun 8, 1:26 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Kent, Muskegon, Newaygo, Oceana, Ottawa and 1 more	64 min
Jun 8, 1:38 PM EDT	Severe Thunderstorm Warning	GRR	Lake, Mason, Mecosta, Newaygo, Oceana, Osceola	52 min
Jun 8, 1:52 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Van Buren	38 min
Jun 8, 2:16 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Barry, Clare, Gratiot, Ionia, Isabella and 7 more	74 min
Jun 8, 2:24 PM EDT	Severe Thunderstorm Warning	IWX	Berrien, Cass	66 min
Jun 8, 2:27 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Barry, Calhoun, Eaton, Kalamazoo, Van Buren	78 min
Jun 8, 2:30 PM EDT	Tornado Warning	GRR	Clare, Osceola	38 min
Jun 8, 2:34 PM EDT	Tornado Warning	GRR	Osceola	13 min
Jun 8, 2:46 PM EDT	Tornado Warning	IWX	Berrien, Cass	44 min
Jun 8, 2:57 PM EDT	Severe Thunderstorm Warning	DTX	Bay, Midland	63 min
Jun 8, 3:12 PM EDT	Severe Thunderstorm Warning	IWX	Cass, Saint Joseph	63 min
Jun 8, 3:16 PM EDT	Severe Thunderstorm Warning	GRR	Barry, Clinton, Eaton, Gratiot, Ingham, Ionia and 2 more	59 min
Jun 8, 3:18 PM EDT	Severe Thunderstorm Warning	DTX	Sanilac	34 min
Jun 8, 3:22 PM EDT	Tornado Warning	DTX	Bay	14 min
Jun 8, 3:34 PM EDT	Severe Thunderstorm Warning	GRR	Barry, Calhoun, Eaton, Ingham, Jackson, Kalamazoo	71 min
Jun 8, 3:35 PM EDT	Severe Thunderstorm Warning	DTX	Bay, Saginaw, Shiawassee	70 min
Jun 8, 3:48 PM EDT	Severe Thunderstorm Warning	DTX	Huron	57 min
Jun 8, 4:01 PM EDT	Tornado Warning	GRR	Clinton, Eaton, Ingham	25 min
Jun 8, 4:07 PM EDT	Severe Thunderstorm Warning	DTX	Huron, Saginaw, Sanilac, Tuscola	68 min
Jun 8, 4:13 PM EDT	Severe Thunderstorm Warning	DTX	Genesee, Livingston, Oakland, Shiawassee	61 min
Jun 8, 4:19 PM EDT	Tornado Warning	DTX	Genesee, Livingston, Shiawassee	41 min
Jun 8, 4:21 PM EDT	Severe Thunderstorm Warning	DTX	Washtenaw	69 min
Jun 8, 4:35 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer, Oakland	70 min
Jun 8, 4:45 PM EDT	Severe Thunderstorm Warning	DTX	Huron	22 min
Jun 8, 4:45 PM EDT	Severe Thunderstorm Warning	GRR	Jackson	30 min
Jun 8, 4:54 PM EDT	Severe Thunderstorm Warning	DTX	Sanilac	49 min
Jun 8, 5:03 PM EDT	Severe Thunderstorm Warning	DTX	Macomb, Saint Clair	57 min
Jun 8, 5:07 PM EDT	Tornado Warning	DTX	Macomb, Oakland	27 min
Jun 8, 5:14 PM EDT	Severe Thunderstorm Warning	DTX	Wayne	46 min
Jun 8, 5:23 PM EDT	Severe Thunderstorm Warning	DTX	Lenawee, Monroe	54 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, 5.0 hours before the alert went out and 166 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 538 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 1230 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 7, 9:57 PM EDT	Mesoscale Discussion	SPC	Allegan, Barry, Calhoun, Eaton, Ingham, Ionia and 5 more	63 min
Jun 8, 1:44 PM EDT	Mesoscale Discussion	SPC	Alcona, Alpena, Arenac, Barry, Bay, Branch and 35 more	91 min
Jun 8, 3:04 PM EDT	Mesoscale Discussion	SPC	Berrien, Cass, Saint Joseph	116 min

Nearby

Severe Thunderstorm Watches in Michigan, 2008 Every severe thunderstorm watch in 2008

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.