Alert archive / Illinois / Mesoscale Discussions in 2018

Mesoscale Discussion 694

June 10, 201840 counties in Illinois; 4 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jun 10, 2018, 12:17 PM CDT for 40 counties in Illinois; 4 counties in Indiana. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jun 10, 2018, 12:17 PM CDT (17:17 UTC)
Expired: Jun 10, 2018, 2:15 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 44 counties

Bond County, IL, Brown County, IL, Cass County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Wabash County, IL, Wayne County, IL, Gibson County, IN, Knox County, IN, Sullivan County, IN, Vigo County, IN

The radar

The Lincoln radar (KILX), 97 km from the middle of the area, began a volume at 17:20 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 5.3 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: 585 J/kg
Mixed-layer CIN: -193 J/kg
Mixed-layer LCL: 611 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 362 m²/s²
0-3 km storm-relative helicity: 382 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.2

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 9, 7:43 PM CDT	Severe Thunderstorm Watch	SPC	Bureau, Carroll, Henry, Jo Daviess, Lee, Ogle and 5 more	6 hr
Jun 9, 10:17 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Henry, Jo Daviess, LaSalle and 8 more	118 min
Jun 9, 11:44 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Henry, Jo Daviess, LaSalle and 8 more	2 hr
Jun 10, 10:04 AM CDT	Mesoscale Discussion	SPC	Bond, Cass, Champaign, Christian, Clark, Clay and 43 more	116 min
Jun 10, 12:46 PM CDT	Severe Thunderstorm Watch	SPC	Cass, Champaign, Christian, Clark, Clay, Coles and 29 more	7 hr
Jun 10, 2:42 PM CDT	Mesoscale Discussion	SPC	Champaign, Christian, Clark, Clay, Coles, Crawford and 20 more	93 min
Jun 10, 2:56 PM CDT	Severe Thunderstorm Watch	SPC	Edwards, Wabash, Wayne, White	5 hr
Jun 10, 4:30 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Greene, Jersey, Macoupin and 3 more	90 min
Jun 10, 5:20 PM CDT	Mesoscale Discussion	SPC	Edwards, Lawrence, Wabash, Wayne, White	85 min

Nearby

Mesoscale Discussions in Illinois, 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.