Alert archive / Illinois / Mesoscale Discussions in 2013

Mesoscale Discussion 1208

June 24, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2013, 6:00 PM CDT for 4 states. It was in force for 75 min.

The area

The outline as issued.

The facts

Issued: Jun 24, 2013, 6:00 PM CDT (23:00 UTC)
Expired: Jun 24, 2013, 7:15 PM CDT
In force: 75 min
Issued by: the Storm Prediction Center

All 42 counties

Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage 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, Marshall County, IL, McHenry County, IL, Putnam County, IL, Will County, IL, Woodford County, IL, Elkhart County, IN, Fulton County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, White County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Cass County, MI, Kalamazoo County, MI, Saint Joseph County, MI, Van Buren County, MI, Kenosha County, WI

The radar

The Chicago radar (KLOT), 57 km from the middle of the area, began a volume at 23:00 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 358Jun 24, 6:15 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.0 hours before the alert went out and 210 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: 1763 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 947 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -56 m²/s²
0-3 km storm-relative helicity: -54 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
Jun 24, 10:35 AM CDT	Mesoscale Discussion	SPC	Adams, Hancock	55 min
Jun 24, 12:14 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Bureau, Carroll, Cass, Christian and 29 more	7 hr
Jun 24, 2:11 PM CDT	Mesoscale Discussion	SPC	Adams, Boone, Brown, Bureau, Carroll, Cass and 50 more	2 hr
Jun 24, 3:14 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	6 hr
Jun 24, 6:14 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Coles, Douglas, Edgar, Moultrie, Piatt and 1 more	4 hr

Nearby

Mesoscale Discussions in Illinois, 2013 Mesoscale Discussions in Indiana, 2013 Mesoscale Discussions in Michigan, 2013 Every mesoscale discussion in 2013

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.