Alert archive / Illinois / Mesoscale Discussions in 2018

Mesoscale Discussion 698

June 10, 20189 counties in Illinois; 9 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 10, 2018, 4:30 PM CDT for 9 counties in Illinois; 9 counties in Missouri. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jun 10, 2018, 4:30 PM CDT (21:30 UTC)
Expired: Jun 10, 2018, 6:00 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

Counties Adams County, IL, Brown County, IL, Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Morgan County, IL, Pike County, IL, Scott County, IL, Audrain County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 100 km from the middle of the area, began a volume at 21:30 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, 9.5 hours before the alert went out and 218 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, 12:17 PM CDT	Mesoscale Discussion	SPC	Bond, Brown, Cass, Christian, Clark, Clay and 34 more	118 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, 5:20 PM CDT	Mesoscale Discussion	SPC	Edwards, Lawrence, Wabash, Wayne, White	85 min

Nearby

Mesoscale Discussions in Illinois, 2018 Mesoscale Discussions in Missouri, 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.