Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 1309

July 17, 201620 counties in Illinois; 10 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2016, 3:05 PM CDT for 20 counties in Illinois; 10 counties in Indiana. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Jul 17, 2016, 3:05 PM CDT (20:05 UTC)
Expired: Jul 17, 2016, 5:00 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 30 counties

Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Marion County, IL, Moultrie County, IL, Richland County, IL, Shelby County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Clay County, IN, Daviess County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Pike County, IN, Posey County, IN, Sullivan County, IN, Vanderburgh County, IN, Vigo County, IN

The radar

The Evansville,IN radar (KVWX), 66 km from the middle of the area, began a volume at 20:09 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, 8.1 hours before the alert went out and 161 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: 592 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.7

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, 7:00 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 24 more	2 hr
Jul 17, 12:20 PM CDT	Mesoscale Discussion	SPC	Clark, Edgar	115 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.