Alert archive / Illinois / Mesoscale Discussions in 2011

Mesoscale Discussion 1341

June 21, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2011, 3:31 PM CDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2011, 3:31 PM CDT (20:31 UTC)
Expired: Jun 21, 2011, 5:00 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 78 counties

Alexander County, IL, Bond County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, Massac County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Union County, IL, Vermilion County, IL, Washington County, IL, Wayne County, IL, Williamson County, IL, Warren County, IN, Ballard County, KY, Carlisle County, KY, Hickman County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Mississippi County, MO, Oregon County, MO, Perry County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO

The radar

The Lincoln radar (KILX), 138 km from the middle of the area, began a volume at 20:31 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, 8.5 hours before the alert went out and 141 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: 489 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 1353 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: -245 m²/s²
0-3 km storm-relative helicity: -164 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -5.5

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 21, 11:45 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DeWitt and 32 more	3 hr
Jun 21, 12:56 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Calhoun, Christian, Clay, Clinton and 40 more	64 min
Jun 21, 1:22 PM CDT	Tornado Watch	SPC	Alexander, Bond, Calhoun, Cass, Champaign, Christian and 49 more	9 hr
Jun 21, 4:56 PM CDT	Mesoscale Discussion	SPC	Bond, Brown, Bureau, Cass, Champaign, Christian and 68 more	94 min
Jun 21, 5:42 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more	4 hr
Jun 20, 7:46 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Bates, Buchanan, Caldwell, Cass and 12 more	59 min
Jun 20, 8:32 PM CDT	Tornado Watch	SPC	Adair, Andrew, Atchison, Barton, Bates, Benton and 40 more	4 hr
Jun 20, 9:46 PM CDT	Severe Thunderstorm Watch	SPC	Barry, Barton, Benton, Cedar, Christian, Dade and 12 more	9 hr
Jun 20, 10:22 PM CDT	Mesoscale Discussion	SPC	Adair, Caldwell, Carroll, Chariton, Clay, Clinton and 14 more	83 min
Jun 21, 3:15 AM CDT	Mesoscale Discussion	SPC	Barry, Christian, Dade, Greene, Jasper, Lawrence and 5 more	60 min

Nearby

Mesoscale Discussions in Illinois, 2011 Mesoscale Discussions in Missouri, 2011 Mesoscale Discussions in Kentucky, 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.