Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 1315

July 18, 201616 counties in Illinois; Knox County, Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2016, 7:59 AM CDT for 16 counties in Illinois; Knox County, Indiana. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jul 18, 2016, 7:59 AM CDT (12:59 UTC)
Expired: Jul 18, 2016, 9:30 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Christian County, IL, Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Effingham County, IL, Jasper County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Mason County, IL, Menard County, IL, Moultrie County, IL, Richland County, IL, Shelby County, IL, Tazewell County, IL, Knox County, IN

The radar

The Lincoln radar (KILX), 59 km from the middle of the area, began a volume at 13:02 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, 1.0 hours before the alert went out and 51 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: 2983 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 4.9

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
Jul 17, 8:06 PM CDT	Mesoscale Discussion	SPC	DeWitt, Ford, Fulton, Hancock, Iroquois, Kankakee and 12 more	84 min
Jul 17, 9:02 PM CDT	Severe Thunderstorm Watch	SPC	Ford, Grundy, Iroquois, Kankakee, LaSalle, Livingston and 1 more	4 hr
Jul 17, 9:46 PM CDT	Mesoscale Discussion	SPC	Bureau, Ford, Fulton, Grundy, Hancock, Henderson and 18 more	89 min
Jul 17, 11:25 PM CDT	Mesoscale Discussion	SPC	Cook, DuPage, Ford, Grundy, Iroquois, Kankakee and 8 more	95 min
Jul 18, 12:51 AM CDT	Mesoscale Discussion	SPC	Allen, DeKalb, Elkhart, Fulton, Huntington, Kosciusko and 7 more	114 min

Nearby

Mesoscale Discussions in Illinois, 2016 Mesoscale Discussions in Indiana, 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.