Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 928

June 7, 201529 counties in Illinois; 23 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jun 7, 2015, 5:34 PM CDT for 29 counties in Illinois; 23 counties in Indiana. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jun 7, 2015, 5:34 PM CDT (22:34 UTC)
Expired: Jun 7, 2015, 7:00 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 52 counties

Bureau County, IL, Champaign County, IL, DeWitt County, IL, Douglas County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Will County, IL, Woodford County, IL, Allen County, IN, Benton County, IN, Carroll County, IN, Cass County, IN, Elkhart County, IN, Fulton County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN

The radar

The Chicago radar (KLOT), 88 km from the middle of the area, began a volume at 22:36 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, 10.6 hours before the alert went out and 90 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: 124 J/kg
Mixed-layer CIN: -173 J/kg
Mixed-layer LCL: 1036 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 263 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

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 7, 1:52 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, DeWitt, Ford, Fulton and 18 more	53 min
Jun 7, 2:36 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Cass, Champaign, Coles, DeKalb and 33 more	5 hr
Jun 7, 3:33 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Hancock, Henderson	4 hr
Jun 7, 6:21 PM CDT	Mesoscale Discussion	SPC	Adams, Hancock, Henderson	84 min
Jun 7, 3:50 PM CDT	Mesoscale Discussion	SPC	Bartholomew, Benton, Boone, Brown, Carroll, Cass and 36 more	55 min
Jun 7, 3:56 PM CDT	Severe Thunderstorm Watch	SPC	Cass, Fulton, Kosciusko, LaPorte, Marshall, Miami and 4 more	4 hr
Jun 7, 6:06 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Blackford, Boone, Carroll, Cass and 39 more	6 hr

Nearby

Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Indiana, 2015 Every mesoscale discussion in 2015

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.