Alert archive / Illinois / Mesoscale Discussions in 2018

Mesoscale Discussion 702

June 10, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Jun 10, 2018, 7:01 PM CDT for 4 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jun 10, 2018, 7:01 PM CDT (00:01 UTC)
Expired: Jun 10, 2018, 8:00 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

All 76 counties

Bond County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Hardin County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Pike County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Dubois County, IN, Gibson County, IN, Knox County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Crittenden County, KY, Daviess County, KY, Edmonson County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henderson County, KY, Hopkins County, KY, Larue County, KY, McLean County, KY, Meade County, KY, Muhlenberg County, KY, Ohio County, KY, Union County, KY, Webster County, KY, City of Saint Louis, MO, Lincoln County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The Evansville,IN radar (KVWX), 44 km from the middle of the area, began a volume at 00:02 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, 0.0 hours before the alert went out and 183 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: 407 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1018 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.8

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 4:53 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 35 more	2 hr
Jun 11, 4:11 PM CDT	Mesoscale Discussion	SPC	Bell, Boyle, Casey, Clay, Garrard, Harlan and 14 more	3 hr
Jun 11, 3:42 PM CDT	Tornado Watch	SPC	Atchison, Holt, Nodaway, Worth	6 hr
Jun 11, 6:12 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Atchison, Bates, Buchanan, Caldwell, Carroll and 19 more	8 hr

Nearby

Mesoscale Discussions in Illinois, 2018 Mesoscale Discussions in Kentucky, 2018 Mesoscale Discussions in Indiana, 2018 Every mesoscale discussion in 2018

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.