Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 1096

June 20, 201512 counties in Illinois; 7 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2015, 11:32 PM CDT for 12 counties in Illinois; 7 counties in Indiana. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2015, 11:32 PM CDT (04:32 UTC)
Expired: Jun 21, 2015, 12:30 AM CDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Champaign County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Iroquois County, IL, Livingston County, IL, Moultrie County, IL, Piatt County, IL, Vermilion County, IL, Benton County, IN, Clay County, IN, Fountain County, IN, Parke County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN

The radar

The Lincoln radar (KILX), 107 km from the middle of the area, began a volume at 04:33 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 00:00Z, 4.5 hours before the alert went out and 50 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: 143 J/kg
Mixed-layer CIN: -493 J/kg
Mixed-layer LCL: 1524 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 20, 10:12 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Hancock, Henderson and 11 more	63 min
Jun 20, 10:13 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Clark, Coles, Cumberland, Douglas, Edgar and 7 more	4 hr
Jun 21, 2:58 AM CDT	Mesoscale Discussion	SPC	Calhoun, Greene, Jersey	2 hr
Jun 21, 9:42 AM CDT	Mesoscale Discussion	SPC	Calhoun, Jersey	2 hr
Jun 21, 12:12 PM CDT	Severe Thunderstorm Watch	SPC	Calhoun, Pike	5 hr
Jun 21, 3:56 PM CDT	Mesoscale Discussion	SPC	Clinton, Franklin, Hamilton, Hardin, Jackson, Jefferson and 10 more	2 hr
Jun 21, 5:05 PM CDT	Severe Thunderstorm Watch	SPC	Franklin, Gallatin, Hamilton, Hardin, Jackson, Jefferson and 7 more	5 hr
Jun 21, 1:08 AM CDT	Mesoscale Discussion	SPC	Bartholomew, Boone, Brown, Dearborn, Decatur, Delaware and 24 more	67 min

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.