Alert archive / Illinois / Mesoscale Discussions in 2011

Mesoscale Discussion 1148

June 9, 201140 counties in Illinois; 4 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jun 9, 2011, 5:46 AM CDT for 40 counties in Illinois; 4 counties in Indiana. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jun 9, 2011, 5:46 AM CDT (10:46 UTC)
Expired: Jun 9, 2011, 6:45 AM CDT
In force: 59 min
Issued by: the Storm Prediction Center

All 44 counties

Boone County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Champaign County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 103 km from the middle of the area, began a volume at 10:48 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, 10.8 hours before the alert went out and 111 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: 1634 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 2146 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 107 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
Jun 8, 8:43 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 19 more	92 min
Jun 8, 11:45 PM CDT	Mesoscale Discussion	SPC	Bureau, Cook, DeKalb, DuPage, Grundy, Kane and 6 more	90 min
Jun 9, 1:44 AM CDT	Mesoscale Discussion	SPC	Bureau, Carroll, DeKalb, Henderson, Henry, Jo Daviess and 12 more	2 hr
Jun 9, 4:29 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Christian, Fulton, Greene and 12 more	61 min
Jun 9, 4:43 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Calhoun, Pike	5 hr
Jun 9, 5:31 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 9 more	89 min

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.