Alert archive / Indiana / Mesoscale Discussions in 2008

Mesoscale Discussion 141

February 4, 200829 counties in Indiana; 9 counties in Michigan; 24 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Feb 4, 2008, 8:27 PM EST for 29 counties in Indiana; 9 counties in Michigan; 24 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Feb 4, 2008, 8:27 PM EST (01:27 UTC)
Expired: Feb 4, 2008, 10:30 PM EST
In force: 2 hr
Issued by: the Storm Prediction Center

All 62 counties

Adams County, IN, Allen County, IN, Benton County, IN, Blackford 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, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN, Branch County, MI, Cass County, MI, Hillsdale County, MI, Jackson County, MI, Lenawee County, MI, Monroe County, MI, Saint Joseph County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Crawford County, OH, Cuyahoga County, OH, Defiance County, OH, Erie County, OH, Fulton County, OH, Geauga County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Huron County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Medina County, OH, Ottawa County, OH, Paulding County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Northern Indiana radar (KIWX), 98 km from the middle of the area, began a volume at 01:30 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 00:00Z, 1.5 hours before the alert went out and 164 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: 430 m above ground
0-6 km bulk shear: 97 kt
0-1 km storm-relative helicity: 833 m²/s²
0-3 km storm-relative helicity: 974 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
Feb 4, 8:14 PM EST	Severe Thunderstorm Watch	SPC	Benton, Jasper, Lake, Newton, Porter	6 hr
Feb 4, 8:18 PM EST	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Carroll, Cass and 23 more	117 min
Feb 4, 8:28 PM EST	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Carroll, Cass and 23 more	2 hr
Feb 4, 10:21 PM EST	Mesoscale Discussion	SPC	Posey, Vanderburgh	84 min
Feb 5, 7:45 AM EST	Mesoscale Discussion	SPC	Clark, Floyd, Harrison, Perry	2 hr
Feb 5, 4:09 PM EST	Tornado Watch PDS	SPC	Gibson, Pike, Posey, Spencer, Vanderburgh, Warrick	9 hr

Nearby

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