Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 1671

July 7, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2003, 8:30 AM CDT for 4 states. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Jul 7, 2003, 8:30 AM CDT (13:30 UTC)
Expired
Jul 7, 2003, 9:30 AM CDT
In force
60 min
Issued by
the Storm Prediction Center
All 92 counties

Champaign County, IL, DeWitt County, IL, Douglas County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Piatt County, IL, Sangamon County, IL, Tazewell County, IL, Vermilion County, IL, Will 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, DeKalb County, IN, Delaware County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Madison County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Parke County, IN, Porter County, IN, Pulaski County, IN, Randolph County, IN, Saint Joseph County, IN, Starke County, IN, Steuben 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, Allegan County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Hillsdale County, MI, Kalamazoo County, MI, Lenawee County, MI, Saint Joseph County, MI, Van Buren County, MI, Allen County, OH, Auglaize County, OH, Darke County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Logan County, OH, Lucas County, OH, Mercer County, OH, Paulding County, OH, Putnam County, OH, Shelby County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Northern Indiana radar (KIWX), 76 km from the middle of the area, began a volume at 13:33 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 1.5 hours before the alert went out and 203 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 12:00Z on 2003-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1626 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 12:00Z on 2003-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 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
1626 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
1135 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
113 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 6, 8:46 PM CDTMesoscale DiscussionSPCBoone, Cook, DeKalb, DuPage, Ford, Grundy and 10 more59 min
Jul 7, 1:25 AM CDTMesoscale DiscussionSPCJo Daviess, Stephenson, Winnebago95 min
Jul 7, 2:40 AM CDTSevere Thunderstorm WatchSPCJo Daviess4 hr
Jul 7, 4:22 AM CDTMesoscale DiscussionSPCJo Daviess, Stephenson83 min
Jul 7, 6:23 AM CDTMesoscale DiscussionSPCBureau, Carroll, DeKalb, Grundy, Henry, Kendall and 9 more97 min
Jul 7, 8:45 AM CDTSevere Thunderstorm WatchSPCChampaign, Cook, DeWitt, Ford, Grundy, Iroquois and 6 more4 hr
Jul 7, 10:14 AM CDTMesoscale DiscussionSPCChampaign, DeWitt, Ford, Iroquois, McLean, Piatt and 1 more61 min
Jul 7, 12:14 PM CDTMesoscale DiscussionSPCBond, Brown, Cass, Champaign, Christian, Clark and 42 more61 min
Jul 7, 2:35 PM CDTMesoscale DiscussionSPCBoone, Jo Daviess, McHenry, Stephenson, Winnebago115 min
Jul 7, 3:35 PM CDTSevere Thunderstorm WatchSPCRock Island5 hr
Jul 7, 4:34 PM CDTMesoscale DiscussionSPCIroquois, Kankakee, Vermilion, Will56 min
Jul 6, 11:10 PM CDTSevere Thunderstorm WatchSPCBartholomew, Boone, Brown, Clinton, Dearborn, Decatur and 21 more3 hr
Jul 6, 11:51 PM CDTMesoscale DiscussionSPCBartholomew, Boone, Brown, Clinton, Dearborn, Decatur and 21 more114 min
Jul 7, 11:30 AM CDTSevere Thunderstorm WatchSPCFayette, Henry, Jay, Randolph, Rush, Union and 1 more6 hr
Jul 7, 5:30 PM CDTTornado WatchSPCAdams, Allen, Blackford, Carroll, Cass, Clinton and 28 more6 hr
Jul 7, 12:54 PM CDTMesoscale DiscussionSPCDickinson, Iron66 min
Jul 7, 4:42 PM CDTMesoscale DiscussionSPCChippewa, Luce, Mackinac, Schoolcraft3 hr
Jul 7, 1:56 PM CDTMesoscale DiscussionSPCAshland, Belmont, Carroll, Champaign, Clark, Columbiana and 42 more94 min
Jul 7, 2:10 PM CDTSevere Thunderstorm WatchSPCAthens, Belmont, Carroll, Columbiana, Guernsey, Harrison and 12 more6 hr
Jul 7, 5:52 PM CDTMesoscale DiscussionSPCAthens, Belmont, Carroll, Columbiana, Gallia, Geauga and 15 more53 min

Nearby

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