Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 1963

August 13, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2011, 11:45 AM CDT for 4 states. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Aug 13, 2011, 11:45 AM CDT (16:45 UTC)
Expired
Aug 13, 2011, 12:45 PM CDT
In force
60 min
Issued by
the Storm Prediction Center
All 55 counties

Bureau County, IL, Champaign County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, McLean County, IL, Putnam County, IL, Stark County, IL, Vermilion County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton 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, Allegan County, MI, Berrien County, MI, Branch County, MI, Cass County, MI, Kalamazoo County, MI, Saint Joseph County, MI, Van Buren County, MI, Kenosha County, WI

The radar

The Chicago radar (KLOT), 59 km from the middle of the area, began a volume at 16:45 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, 4.8 hours before the alert went out and 179 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 2011-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.1000850700500300200100-30°-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 2011-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 square meters per square second.193958Sfc1 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
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.

IssuedProductOfficeCountiesLasted
Aug 13, 12:12 PM CDTSevere Thunderstorm WatchSPCChampaign, Christian, Clark, Coles, Cook, Cumberland and 32 more9 hr
Aug 13, 3:29 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clay, Clinton and 21 more91 min
Aug 13, 6:10 PM CDTMesoscale DiscussionSPCClark, Coles, Cumberland, Douglas, Edgar, Shelby and 1 more95 min
Aug 13, 4:53 PM CDTMesoscale DiscussionSPCBartholomew, Boone, Brown, Clay, Daviess, Decatur and 26 more37 min
Aug 13, 4:57 PM CDTSevere Thunderstorm WatchSPCBartholomew, Boone, Brown, Clay, Daviess, Decatur and 26 more7 hr
Aug 13, 5:30 PM CDTMesoscale DiscussionSPCClark, Floyd, Ohio, Switzerland90 min
Aug 13, 4:28 PM CDTSevere Thunderstorm WatchSPCGenesee, Lapeer, Lenawee, Livingston, Macomb, Monroe and 5 more4 hr

Nearby

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