Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 1969

August 13, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2011, 3:29 PM CDT for 4 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Aug 13, 2011, 3:29 PM CDT (20:29 UTC)
Expired: Aug 13, 2011, 5:00 PM CDT
In force: 91 min
Issued by: the Storm Prediction Center

All 74 counties

Bond County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Kankakee County, IL, Macon County, IL, Marion County, IL, McLean County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Shelby County, IL, Vermilion County, IL, Allen County, IN, Benton County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, DeKalb County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Branch County, MI, Hillsdale County, MI, Jackson County, MI, Lenawee County, MI, Livingston County, MI, Saint Joseph County, MI, Defiance County, OH, Fulton County, OH, Paulding County, OH, Williams County, OH

The radar

The Indianapolis radar (KIND), 124 km from the middle of the area, began a volume at 20:32 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.5 hours before the alert went out and 90 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: 7333 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 84 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
Aug 13, 11:45 AM CDT	Mesoscale Discussion	SPC	Bureau, Champaign, Cook, DeKalb, DuPage, Ford and 16 more	60 min
Aug 13, 12:12 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Clark, Coles, Cook, Cumberland and 32 more	9 hr
Aug 13, 6:10 PM CDT	Mesoscale Discussion	SPC	Clark, Coles, Cumberland, Douglas, Edgar, Shelby and 1 more	95 min
Aug 13, 4:53 PM CDT	Mesoscale Discussion	SPC	Bartholomew, Boone, Brown, Clay, Daviess, Decatur and 26 more	37 min
Aug 13, 4:57 PM CDT	Severe Thunderstorm Watch	SPC	Bartholomew, Boone, Brown, Clay, Daviess, Decatur and 26 more	7 hr
Aug 13, 5:30 PM CDT	Mesoscale Discussion	SPC	Clark, Floyd, Ohio, Switzerland	90 min
Aug 13, 4:28 PM CDT	Severe Thunderstorm Watch	SPC	Genesee, Lapeer, Lenawee, Livingston, Macomb, Monroe and 5 more	4 hr

Nearby

Mesoscale Discussions in Indiana, 2011 Mesoscale Discussions in Illinois, 2011 Mesoscale Discussions in Michigan, 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.