Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 1615

July 4, 20037 counties in Illinois; 29 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2003, 8:58 PM CDT for 7 counties in Illinois; 29 counties in Indiana. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Jul 4, 2003, 8:58 PM CDT (01:58 UTC)
Expired: Jul 4, 2003, 10:00 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

All 36 counties

DuPage County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Will County, IL, Allen County, IN, Benton County, IN, Blackford County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN

The radar

The Northern Indiana radar (KIWX), 101 km from the middle of the area, began a volume at 01:58 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 00:00Z, 2.0 hours before the alert went out and 191 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: 2705 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1609 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 81 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
Jul 4, 10:09 PM CDT	Mesoscale Discussion	SPC	Brown, Cass, Champaign, DeWitt, Douglas, Ford and 20 more	2 hr
Jul 4, 10:45 PM CDT	Mesoscale Discussion	SPC	Jo Daviess, Rock Island	90 min
Jul 4, 11:25 PM CDT	Severe Thunderstorm Watch	SPC	Carroll, Henderson, Henry, Jo Daviess, Knox, Mercer and 6 more	7 hr
Jul 5, 2:31 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more	89 min
Jul 5, 3:40 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 11 more	4 hr
Jul 5, 5:43 AM CDT	Mesoscale Discussion	SPC	Cook, Kankakee, Lake, Will	92 min
Jul 5, 12:55 PM CDT	Mesoscale Discussion	SPC	Champaign, Christian, Clark, Coles, Crawford, Cumberland and 14 more	3 hr
Jul 5, 4:34 PM CDT	Mesoscale Discussion	SPC	Champaign, Ford, Iroquois, Vermilion	56 min
Jul 5, 5:18 PM CDT	Mesoscale Discussion	SPC	Cass, DeWitt, Fulton, Hancock, Henderson, Henry and 16 more	57 min
Jul 5, 5:55 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Cass, Champaign, Christian, Clark and 36 more	6 hr
Jul 5, 6:00 AM CDT	Severe Thunderstorm Watch	SPC	Elkhart, LaGrange, LaPorte, Porter, Saint Joseph, Steuben	3 hr
Jul 5, 7:12 AM CDT	Mesoscale Discussion	SPC	Adams, Allen, DeKalb, Elkhart, Fulton, Huntington and 10 more	93 min
Jul 5, 4:55 PM CDT	Severe Thunderstorm Watch	SPC	Bartholomew, Benton, Boone, Brown, Carroll, Clay and 35 more	4 hr

Nearby

Mesoscale Discussions in Indiana, 2003 Mesoscale Discussions in Illinois, 2003 Every mesoscale discussion in 2003

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.