Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 1311

July 17, 201624 counties in Illinois; 9 counties in Indiana; 6 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2016, 9:46 PM CDT for 24 counties in Illinois; 9 counties in Indiana; 6 counties in Iowa. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jul 17, 2016, 9:46 PM CDT (02:46 UTC)
Expired: Jul 17, 2016, 11:15 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 39 counties

Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Louisa County, IA, Washington County, IA, Bureau County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kankakee County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Starke County, IN, White County, IN

The radar

The Lincoln radar (KILX), 99 km from the middle of the area, began a volume at 02:49 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, 2.8 hours before the alert went out and 116 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: 3314 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 3.3
Supercell composite: 26.5

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, 11:25 PM CDT	Mesoscale Discussion	SPC	Cook, DuPage, Ford, Grundy, Iroquois, Kankakee and 8 more	95 min
Jul 18, 7:59 AM CDT	Mesoscale Discussion	SPC	Christian, Clark, Coles, Crawford, Cumberland, Effingham and 10 more	91 min
Jul 18, 12:51 AM CDT	Mesoscale Discussion	SPC	Allen, DeKalb, Elkhart, Fulton, Huntington, Kosciusko and 7 more	114 min
Jul 17, 11:40 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Decatur, Fremont and 9 more	95 min

Nearby

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