Alert archive / Ohio / Mesoscale Discussions in 2008

Mesoscale Discussion 640

April 11, 2008Randolph County, Wayne County, Indiana; 11 counties in Michigan; 29 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2008, 6:01 PM EDT for Randolph County, Wayne County, Indiana; 11 counties in Michigan; 29 counties in Ohio. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2008, 6:01 PM EDT (22:01 UTC)
Expired: Apr 11, 2008, 7:30 PM EDT
In force: 89 min
Issued by: the Storm Prediction Center

All 42 counties

Randolph County, IN, Wayne County, IN, Genesee County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Sanilac County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Auglaize County, OH, Champaign County, OH, Crawford County, OH, Darke County, OH, Defiance County, OH, Erie County, OH, Fulton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Huron County, OH, Logan County, OH, Lorain County, OH, Lucas County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Ottawa County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Wood County, OH, Wyandot County, OH

The radar

The Detroit radar (KDTX), 120 km from the middle of the area, began a volume at 22:02 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 nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 10.0 hours before the alert went out and 122 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: 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.

Issued	Product	Office	Counties	Lasted
Apr 10, 8:48 PM EDT	Mesoscale Discussion	SPC	Dubois, Gibson, Pike, Posey, Spencer, Vanderburgh and 1 more	57 min
Apr 10, 10:54 PM EDT	Mesoscale Discussion	SPC	Dubois, Gibson, Knox, Pike, Posey, Spencer and 2 more	66 min
Apr 11, 11:47 AM EDT	Mesoscale Discussion	SPC	Adams, Allen, Carroll, Cass, DeKalb, Elkhart and 18 more	88 min
Apr 11, 12:26 PM EDT	Mesoscale Discussion	SPC	Clark, Dearborn, Decatur, Fayette, Floyd, Franklin and 9 more	2 hr
Apr 11, 12:58 PM EDT	Tornado Watch	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more	8 hr
Apr 11, 2:41 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Carroll, Cass, DeKalb and 14 more	94 min
Apr 10, 8:49 PM EDT	Mesoscale Discussion	SPC	Gogebic, Ontonagon	6 hr
Apr 11, 12:33 AM EDT	Mesoscale Discussion	SPC	Gogebic	4 hr

Nearby

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