Alert archive / Illinois / Mesoscale Discussions in 2012

Mesoscale Discussion 2060

October 14, 201222 counties in Illinois; 21 counties in Indiana; 4 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Oct 14, 2012, 2:11 PM CDT for 22 counties in Illinois; 21 counties in Indiana; 4 counties in Michigan. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Oct 14, 2012, 2:11 PM CDT (19:11 UTC)
Expired: Oct 14, 2012, 4:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 47 counties

Champaign County, IL, Christian County, IL, Coles County, IL, Cook County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, Livingston County, IL, Macon County, IL, McLean County, IL, Moultrie County, IL, Piatt County, IL, Shelby County, IL, Vermilion County, IL, Will County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Tippecanoe County, IN, Vermillion County, IN, Warren County, IN, White County, IN, Allegan County, MI, Berrien County, MI, Cass County, MI, Van Buren County, MI

The radar

The Chicago radar (KLOT), 80 km from the middle of the area, began a volume at 19:12 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, 7.2 hours before the alert went out and 138 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: 11 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 938 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 246 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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Nearby

Mesoscale Discussions in Illinois, 2012 Mesoscale Discussions in Indiana, 2012 Mesoscale Discussions in Michigan, 2012 Every mesoscale discussion in 2012

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.