Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 857

June 9, 201631 counties in Illinois; Clinton County, Jackson County, Iowa; 6 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 9, 2016, 7:58 PM CDT for 31 counties in Illinois; Clinton County, Jackson County, Iowa; 6 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 9, 2016, 7:58 PM CDT (00:58 UTC)
Expired: Jun 9, 2016, 10:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 39 counties

Clinton County, IA, Jackson County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Champaign County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, McLean County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Dane County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Rock County, WI, Walworth County, WI

The radar

The Chicago radar (KLOT), 98 km from the middle of the area, began a volume at 00:59 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

Davenport, (KDVN), launched 00:00Z, 1.0 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: 647 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 1158 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 300 m²/s²
0-3 km storm-relative helicity: 633 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.1

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 10, 12:02 PM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Emmet, Kossuth, O'Brien, Osceola and 2 more	88 min
Jun 10, 2:54 PM CDT	Mesoscale Discussion	SPC	Allamakee, Howard, Mitchell, Winneshiek	96 min
Jun 10, 3:19 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Cerro Gordo, Emmet, Hancock, Howard, Kossuth and 6 more	6 hr
Jun 10, 5:51 PM CDT	Mesoscale Discussion	SPC	Allamakee, Cerro Gordo, Emmet, Hancock, Howard, Kossuth and 5 more	114 min
Jun 10, 2:44 PM CDT	Tornado Watch	SPC	Ashland, Barron, Chippewa, Clark, Dunn, Eau Claire and 17 more	5 hr
Jun 10, 5:09 PM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Clark, Eau Claire, Florence, Forest and 18 more	2 hr
Jun 10, 5:41 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Calumet, Columbia, Dodge, Door, Fond du Lac and 16 more	4 hr

Nearby

Mesoscale Discussions in Illinois, 2016 Mesoscale Discussions in Wisconsin, 2016 Mesoscale Discussions in Iowa, 2016 Every mesoscale discussion in 2016

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.