Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 1617

July 4, 200326 counties in Illinois; 33 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2003, 10:09 PM CDT for 26 counties in Illinois; 33 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 4, 2003, 10:09 PM CDT (03:09 UTC)
Expired
Jul 5, 2003, 12:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 59 counties

Brown County, IL, Cass County, IL, Champaign County, IL, DeWitt County, IL, Douglas County, IL, Ford County, IL, Fulton County, IL, Iroquois County, IL, Kankakee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Peoria County, IL, Piatt County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, Madison County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Pulaski County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN

The radar

The Chicago radar (KLOT), 122 km from the middle of the area, began a volume at 03:13 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, 3.2 hours before the alert went out and 82 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2003-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2705 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2003-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
Jul 4, 8:58 PM CDTMesoscale DiscussionSPCDuPage, Grundy, Iroquois, Kane, Kankakee, Kendall and 1 more62 min
Jul 4, 10:45 PM CDTMesoscale DiscussionSPCJo Daviess, Rock Island90 min
Jul 4, 11:25 PM CDTSevere Thunderstorm WatchSPCCarroll, Henderson, Henry, Jo Daviess, Knox, Mercer and 6 more7 hr
Jul 5, 2:31 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more89 min
Jul 5, 3:40 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Cook, DeKalb, DuPage, Grundy and 11 more4 hr
Jul 5, 5:43 AM CDTMesoscale DiscussionSPCCook, Kankakee, Lake, Will92 min
Jul 5, 12:55 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Coles, Crawford, Cumberland and 14 more3 hr
Jul 5, 4:34 PM CDTMesoscale DiscussionSPCChampaign, Ford, Iroquois, Vermilion56 min
Jul 5, 5:18 PM CDTMesoscale DiscussionSPCCass, DeWitt, Fulton, Hancock, Henderson, Henry and 16 more57 min
Jul 5, 5:55 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, Champaign, Christian, Clark and 36 more6 hr
Jul 5, 6:00 AM CDTSevere Thunderstorm WatchSPCElkhart, LaGrange, LaPorte, Porter, Saint Joseph, Steuben3 hr
Jul 5, 7:12 AM CDTMesoscale DiscussionSPCAdams, Allen, DeKalb, Elkhart, Fulton, Huntington and 10 more93 min
Jul 5, 4:55 PM CDTSevere Thunderstorm WatchSPCBartholomew, Benton, Boone, Brown, Carroll, Clay and 35 more4 hr

Nearby

Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Illinois, 2003Every 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.