Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 1903

August 8, 201146 counties in Indiana; 9 counties in Kentucky; 13 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2011, 6:00 PM EDT for 46 counties in Indiana; 9 counties in Kentucky; 13 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 8, 2011, 6:00 PM EDT (22:00 UTC)
Expired: Aug 8, 2011, 8:00 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 68 counties

Bartholomew County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Jasper County, IN, Jay County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Ohio County, IN, Pulaski County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Switzerland County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Wabash County, IN, Warren County, IN, Wayne County, IN, White County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Gallatin County, KY, Grant County, KY, Kenton County, KY, Mason County, KY, Pendleton County, KY, Robertson County, KY, Brown County, OH, Butler County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Darke County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Miami County, OH, Montgomery County, OH, Preble County, OH, Warren County, OH

The radar

The Indianapolis radar (KIND), 75 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 watches that followed

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

Severe Thunderstorm Watch 747Aug 8, 6:40 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 10.0 hours before the alert went out and 147 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: 747 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 888 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.7

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 8, 6:38 PM EDT	Severe Thunderstorm Watch	SPC	Benton, Jasper, Newton	5 hr
Aug 7, 9:27 PM EDT	Mesoscale Discussion	SPC	Ballard, Carlisle, Fulton, Graves, Hickman, McCracken	2 hr
Aug 7, 10:18 PM EDT	Severe Thunderstorm Watch	SPC	Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 11 more	4 hr
Aug 7, 11:54 PM EDT	Mesoscale Discussion	SPC	Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 9 more	96 min

Nearby

Mesoscale Discussions in Indiana, 2011 Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in Kentucky, 2011 Every mesoscale discussion in 2011

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.