Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 1709

July 23, 201112 counties in Illinois; 31 counties in Indiana; 30 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2011, 2:18 PM CDT for 12 counties in Illinois; 31 counties in Indiana; 30 counties in Ohio. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Jul 23, 2011, 2:18 PM CDT (19:18 UTC)
Expired
Jul 23, 2011, 3:45 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 73 counties

Champaign County, IL, DeWitt County, IL, Ford County, IL, Iroquois County, IL, Kankakee County, IL, Livingston County, IL, Logan County, IL, McLean County, IL, Piatt County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Kosciusko County, IN, Madison County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Pulaski County, IN, Randolph County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allen County, OH, Ashland County, OH, Auglaize County, OH, Champaign County, OH, Coshocton County, OH, Crawford County, OH, Darke County, OH, Delaware County, OH, Franklin County, OH, Hancock County, OH, Hardin County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Marion County, OH, Medina County, OH, Mercer County, OH, Morrow County, OH, Paulding County, OH, Putnam County, OH, Richland County, OH, Seneca County, OH, Shelby County, OH, Tuscarawas County, OH, Union County, OH, Van Wert County, OH, Wayne County, OH, Wyandot County, OH

The radar

The Indianapolis radar (KIND), 90 km from the middle of the area, began a volume at 19:19 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, 7.3 hours before the alert went out and 200 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2011-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2622 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2011-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2622 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
869 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
64 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.

IssuedProductOfficeCountiesLasted
Jul 22, 7:38 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Grundy and 17 more97 min
Jul 23, 6:06 PM CDTMesoscale DiscussionSPCDeKalb, Elkhart, Kosciusko, LaGrange, Marshall, Noble and 1 more114 min
Jul 22, 7:13 PM CDTMesoscale DiscussionSPCBelmont, Carroll, Columbiana, Harrison, Jefferson, Mahoning and 1 more62 min

Nearby

Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in Illinois, 2011Every 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.