Alert archive / Indiana / Mesoscale Discussions in 2014

Mesoscale Discussion 1617

August 25, 201415 counties in Illinois; 23 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2014, 5:30 PM CDT for 15 counties in Illinois; 23 counties in Indiana. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Aug 25, 2014, 5:30 PM CDT (22:30 UTC)
Expired: Aug 25, 2014, 6:30 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

All 38 counties

DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Livingston County, IL, Marshall County, IL, Putnam County, IL, Vermilion County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hendricks County, IN, Howard County, IN, Jasper County, IN, Lake County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Pulaski County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Warren County, IN, White County, IN

The radar

The Chicago radar (KLOT), 87 km from the middle of the area, began a volume at 22:30 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, 10.5 hours before the alert went out and 92 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: 2485 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1067 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 25, 1:10 PM CDT	Mesoscale Discussion	SPC	Cook, Ford, Grundy, Iroquois, Kankakee, Livingston and 1 more	2 hr
Aug 25, 3:34 PM CDT	Severe Thunderstorm Watch	SPC	Bureau, Champaign, DeKalb, Ford, Grundy, Henry and 15 more	4 hr

Nearby

Mesoscale Discussions in Indiana, 2014 Mesoscale Discussions in Illinois, 2014 Every mesoscale discussion in 2014

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.