Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 1004

June 13, 20155 states

The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2015, 2:42 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 13, 2015, 2:42 PM CDT (19:42 UTC)
Expired: Jun 13, 2015, 4:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 66 counties

Des Moines County, IA, Henry County, IA, Lee County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Cass County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Greene County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Fulton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, White County, IN, Berrien County, MI, Cass County, MI, Clark County, MO, Lewis County, MO, Marion County, MO, Pike County, MO, Ralls County, MO

The radar

The Lincoln radar (KILX), 101 km from the middle of the area, began a volume at 19:45 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 298Jun 13, 4:30 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.7 hours before the alert went out and 109 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: 78 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1249 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 91 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
Jun 13, 4:35 PM CDT	Severe Thunderstorm Watch	SPC	Cook, DeKalb, DuPage, Grundy, Kane, Kankakee and 4 more	2 hr
Jun 12, 7:27 PM CDT	Mesoscale Discussion	SPC	Boone, Clinton, Delaware, Fountain, Hamilton, Hancock and 10 more	33 min
Jun 13, 6:26 PM CDT	Mesoscale Discussion	SPC	Barry, Branch, Calhoun, Eaton, Kalamazoo	64 min
Jun 13, 3:51 PM CDT	Mesoscale Discussion	SPC	Audrain, Barry, Benton, Boone, Callaway, Camden and 43 more	84 min

Nearby

Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Indiana, 2015 Mesoscale Discussions in Missouri, 2015 Every mesoscale discussion in 2015

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.