Alert archive / Indiana / Mesoscale Discussions in 2015

Mesoscale Discussion 1389

July 13, 20158 counties in Illinois; 11 counties in Indiana; Berrien County, Michigan

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2015, 7:19 AM CDT for 8 counties in Illinois; 11 counties in Indiana; Berrien County, Michigan. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2015, 7:19 AM CDT (12:19 UTC)
Expired: Jul 13, 2015, 8:45 AM CDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Livingston County, IL, Will County, IL, Benton 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

The radar

The Chicago radar (KLOT), 40 km from the middle of the area, began a volume at 12:22 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 409Jul 13, 9:05 AM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 0.3 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: 2535 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1016 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 10.6

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
Jul 13, 3:49 AM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Grundy, Iroquois and 7 more	116 min
Jul 13, 4:14 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 18 more	6 hr
Jul 13, 9:17 AM CDT	Severe Thunderstorm Watch	SPC	Champaign, Clark, Coles, Crawford, Cumberland, DeWitt and 16 more	4 hr
Jul 13, 11:01 AM CDT	Mesoscale Discussion	SPC	Edwards, Wabash, White	89 min
Jul 13, 3:21 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Champaign, DeKalb, DeWitt and 29 more	84 min
Jul 13, 4:01 PM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, Cass, Champaign, Christian and 52 more	7 hr
Jul 13, 4:33 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Christian, Clinton and 14 more	57 min
Jul 13, 6:20 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	4 hr
Jul 13, 6:59 PM CDT	Mesoscale Discussion	SPC	Boone, Brown, Bureau, Carroll, Cass, Champaign and 65 more	91 min
Jul 13, 11:55 AM CDT	Severe Thunderstorm Watch	SPC	Clark, Crawford, Dearborn, Dubois, Floyd, Harrison and 8 more	7 hr
Jul 13, 2:04 PM CDT	Mesoscale Discussion	SPC	Clark, Crawford, Dubois, Floyd, Harrison, Orange and 1 more	86 min

Nearby

Mesoscale Discussions in Indiana, 2015 Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Michigan, 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.