Alert archive / Illinois / Mesoscale Discussions in 2011

Mesoscale Discussion 1159

June 9, 201118 counties in Illinois; 8 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 9, 2011, 4:29 PM CDT for 18 counties in Illinois; 8 counties in Missouri. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Jun 9, 2011, 4:29 PM CDT (21:29 UTC)
Expired: Jun 9, 2011, 5:30 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

All 26 counties

Adams County, IL, Brown County, IL, Cass County, IL, Christian County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Logan County, IL, Macoupin County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Clark County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO

The radar

The Lincoln radar (KILX), 111 km from the middle of the area, began a volume at 21:33 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.

Severe Thunderstorm Watch 455Jun 9, 4:40 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.5 hours before the alert went out and 173 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: 2009 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1099 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.3

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, 5:46 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cass, Champaign, Cook and 34 more	59 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
Jun 9, 9:50 AM CDT	Mesoscale Discussion	SPC	Adair, Atchison, Gentry, Harrison, Holt, Mercer and 6 more	55 min
Jun 9, 2:13 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Cass, Clay, Clinton and 6 more	92 min
Jun 9, 3:05 PM CDT	Tornado Watch	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 29 more	7 hr

Nearby

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