Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 1382

July 23, 201610 counties in Illinois

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2016, 8:35 PM CDT for 10 counties in Illinois. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2016, 8:35 PM CDT (01:35 UTC)
Expired: Jul 23, 2016, 10:00 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Will County, IL

The radar

The Chicago radar (KLOT), 56 km from the middle of the area, began a volume at 01:36 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

Davenport, (KDVN), launched 00:00Z, 1.6 hours before the alert went out and 151 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: 3732 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 957 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 202 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 3.5
Supercell composite: 23.8

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 24, 2:25 PM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 5 more	3 hr
Jul 24, 5:42 PM CDT	Mesoscale Discussion	SPC	Champaign, Cook, DuPage, Ford, Grundy, Iroquois and 10 more	93 min
Jul 24, 6:03 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Hancock, Knox and 9 more	87 min

Nearby

Mesoscale Discussions in Illinois, 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.