Alert archive / Michigan / Mesoscale Discussions in 2008

Mesoscale Discussion 635

April 11, 200824 counties in Indiana; 34 counties in Michigan; 9 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2008, 11:47 AM EDT for 24 counties in Indiana; 34 counties in Michigan; 9 counties in Ohio. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Apr 11, 2008, 11:47 AM EDT (15:47 UTC)
Expired
Apr 11, 2008, 1:15 PM EDT
In force
88 min
Issued by
the Storm Prediction Center
All 67 counties

Adams County, IN, Allen County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Noble County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Bay 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, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb 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, Paulding County, OH, Putnam County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH

The radar

The Grand Rapids radar (KGRR), 111 km from the middle of the area, began a volume at 15:49 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 3.8 hours before the alert went out and 129 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-pSkew-T log-p diagram, Detroit, MI at 12:00Z on 2008-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 12:00Z on 2008-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 448 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
462 m above ground
0-6 km bulk shear
84 kt
0-1 km storm-relative helicity
448 m²/s²
0-3 km storm-relative helicity
382 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 10, 8:48 PM EDTMesoscale DiscussionSPCDubois, Gibson, Pike, Posey, Spencer, Vanderburgh and 1 more57 min
Apr 10, 10:54 PM EDTMesoscale DiscussionSPCDubois, Gibson, Knox, Pike, Posey, Spencer and 2 more66 min
Apr 11, 12:26 PM EDTMesoscale DiscussionSPCClark, Dearborn, Decatur, Fayette, Floyd, Franklin and 9 more2 hr
Apr 11, 12:58 PM EDTTornado WatchSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more8 hr
Apr 11, 2:41 PM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, Carroll, Cass, DeKalb and 14 more94 min
Apr 11, 6:01 PM EDTMesoscale DiscussionSPCRandolph, Wayne89 min
Apr 10, 8:49 PM EDTMesoscale DiscussionSPCGogebic, Ontonagon6 hr
Apr 11, 12:33 AM EDTMesoscale DiscussionSPCGogebic4 hr

Nearby

Mesoscale Discussions in Michigan, 2008Mesoscale Discussions in Indiana, 2008Mesoscale Discussions in Ohio, 2008Every mesoscale discussion 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.