Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 945

June 8, 201526 counties in Illinois; 10 counties in Indiana; 4 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2015, 3:32 PM CDT for 26 counties in Illinois; 10 counties in Indiana; 4 counties in Michigan. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jun 8, 2015, 3:32 PM CDT (20:32 UTC)
Expired: Jun 8, 2015, 5:00 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 40 counties

Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, McLean County, IL, Ogle County, IL, Putnam County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Elkhart County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Berrien County, MI, Cass County, MI, Saint Joseph County, MI, Van Buren County, MI

The radar

The Chicago radar (KLOT), 22 km from the middle of the area, began a volume at 20:35 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, 8.5 hours before the alert went out and 189 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: 205 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 658 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -78 m²/s²
0-3 km storm-relative helicity: -11 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.6

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, 7:48 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Calhoun, Cass, Champaign, Christian and 33 more	7 hr
Jun 7, 9:52 PM CDT	Mesoscale Discussion	SPC	Calhoun, Christian, Clark, Coles, Cumberland, Douglas and 13 more	53 min
Jun 8, 2:32 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, DeWitt, Fulton and 14 more	118 min
Jun 7, 8:03 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Boone, Carroll, Cass and 28 more	57 min
Jun 7, 11:02 PM CDT	Mesoscale Discussion	SPC	Bartholomew, Boone, Brown, Clay, Clinton, Delaware and 22 more	88 min
Jun 8, 1:06 PM CDT	Mesoscale Discussion	SPC	Alcona, Alpena, Arenac, Bay, Clare, Crawford and 21 more	114 min

Nearby

Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Indiana, 2015 Mesoscale Discussions in Michigan, 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.