Alert archive / Indiana / Mesoscale Discussions in 2008

Mesoscale Discussion 259

February 17, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Feb 17, 2008, 12:52 PM CST for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Feb 17, 2008, 12:52 PM CST (18:52 UTC)
Expired: Feb 17, 2008, 2:15 PM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 58 counties

Champaign County, IL, Ford County, IL, Iroquois County, IL, Kankakee County, IL, Vermilion County, IL, Adams County, IN, Allen County, IN, Bartholomew County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Johnson County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Randolph County, IN, Rush County, IN, Saint Joseph County, IN, Shelby County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Berrien County, MI, Branch County, MI, Cass County, MI, Saint Joseph County, MI, Williams County, OH

The radar

The Indianapolis radar (KIND), 93 km from the middle of the area, began a volume at 18:54 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

Lincoln, IL (KILX), launched 12:00Z, 6.9 hours before the alert went out and 165 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 457 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 519 m²/s²
0-3 km storm-relative helicity: 717 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 16, 11:34 PM CST	Mesoscale Discussion	SPC	Jo Daviess, Stephenson, Winnebago	5 hr
Feb 17, 12:13 PM CST	Mesoscale Discussion	SPC	Jo Daviess, Stephenson	4 hr
Feb 17, 1:03 AM CST	Mesoscale Discussion	SPC	Arenac, Bay, Clare, Clinton, Crawford, Genesee and 24 more	5 hr

Nearby

Mesoscale Discussions in Indiana, 2008 Mesoscale Discussions in Illinois, 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.