Alert archive / Indiana / Mesoscale Discussions in 2005

Mesoscale Discussion 2014

August 18, 20058 counties in Illinois; 27 counties in Indiana; 6 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Aug 18, 2005, 1:16 PM CDT for 8 counties in Illinois; 27 counties in Indiana; 6 counties in Michigan. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Aug 18, 2005, 1:16 PM CDT (18:16 UTC)
Expired: Aug 18, 2005, 2:45 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 41 counties

Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Livingston County, IL, Will County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton 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, Warren County, IN, White County, IN, Whitley County, IN, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Kalamazoo County, MI, Saint Joseph County, MI

The radar

The Chicago radar (KLOT), 96 km from the middle of the area, began a volume at 18:18 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, 6.3 hours before the alert went out and 180 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: 224 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 856 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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
Aug 18, 9:00 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DeWitt and 34 more	2 hr
Aug 18, 9:25 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 8 more	6 hr
Aug 18, 2:09 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Henry, Jo Daviess, Lee and 6 more	96 min
Aug 18, 4:49 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Hancock, Pike, Schuyler	116 min
Aug 18, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Cass, Fulton, Greene, Hancock and 9 more	6 hr

Nearby

Mesoscale Discussions in Indiana, 2005 Mesoscale Discussions in Illinois, 2005 Mesoscale Discussions in Michigan, 2005 Every mesoscale discussion in 2005

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.