Alert archive / Illinois / Mesoscale Discussions in 2011

Mesoscale Discussion 1459

June 30, 201113 counties in Illinois; 10 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2011, 10:15 PM CDT for 13 counties in Illinois; 10 counties in Indiana. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2011, 10:15 PM CDT (03:15 UTC)
Expired: Jun 30, 2011, 11:15 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

All 23 counties

Champaign County, IL, Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Kankakee County, IL, Vermilion County, IL, Will County, IL, Benton County, IN, Fountain County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Parke County, IN, Sullivan County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN

The radar

The Lincoln radar (KILX), 126 km from the middle of the area, began a volume at 03:16 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 00:00Z, 3.3 hours before the alert went out and 64 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: 2216 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1148 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 5.7

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
Jun 30, 8:07 PM CDT	Mesoscale Discussion	SPC	Cook, DuPage, Lake, Will	23 min
Jun 30, 8:15 PM CDT	Severe Thunderstorm Watch	SPC	Cook, DuPage, Iroquois, Kankakee, Lake, Will	4 hr

Nearby

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