Alert archive / Illinois / Mesoscale Discussions in 2017

Mesoscale Discussion 1714

October 14, 201727 counties in Illinois; 4 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Oct 14, 2017, 6:01 PM CDT for 27 counties in Illinois; 4 counties in Indiana. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Oct 14, 2017, 6:01 PM CDT (23:01 UTC)
Expired: Oct 14, 2017, 7:30 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 31 counties

Brown County, IL, Cass County, IL, Cook County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Peoria County, IL, Putnam County, IL, Schuyler County, IL, Tazewell County, IL, Will County, IL, Woodford County, IL, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 97 km from the middle of the area, began a volume at 23:02 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

Davenport, (KDVN), launched 12:00Z, 11.0 hours before the alert went out and 148 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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
Oct 14, 3:35 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Hancock, Henderson and 10 more	2 hr
Oct 14, 5:09 PM CDT	Tornado Watch	SPC	Adams, Brown, Bureau, Ford, Fulton, Grundy and 24 more	8 hr

Nearby

Mesoscale Discussions in Illinois, 2017 Mesoscale Discussions in Indiana, 2017 Every mesoscale discussion in 2017

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.