Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 379

April 4, 200330 counties in Illinois; 37 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2003, 5:11 PM CST for 30 counties in Illinois; 37 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 4, 2003, 5:11 PM CST (23:11 UTC)
Expired
Apr 4, 2003, 7:15 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 67 counties

Bond County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Lawrence County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marion County, IL, McLean County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Shelby County, IL, Vermilion County, IL, Woodford County, IL, Bartholomew County, IN, Benton County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Daviess County, IN, Fountain County, IN, Greene County, IN, Hamilton County, IN, Hendricks County, IN, Howard County, IN, Jackson County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Washington County, IN, White County, IN

The radar

The Lincoln radar (KILX), 131 km from the middle of the area, began a volume at 23:12 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, 11.2 hours before the alert went out and 80 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 2003-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 60 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 2003-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.193958Sfc1 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
60 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
622 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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
Apr 4, 7:23 AM CSTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 55 more97 min
Apr 4, 9:47 AM CSTMesoscale DiscussionSPCClark, Coles, Crawford, Cumberland, Douglas, Edgar and 9 more58 min
Apr 4, 11:10 AM CSTMesoscale DiscussionSPCBond, Calhoun, Cass, Champaign, Christian, Clinton and 24 more95 min
Apr 4, 12:05 PM CSTTornado WatchSPCAdams, Brown, Calhoun, Cass, Greene, Jersey and 10 more5 hr
Apr 4, 1:12 PM CSTMesoscale DiscussionSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 35 more93 min
Apr 4, 1:29 PM CSTMesoscale DiscussionSPCBureau, Cook, DeKalb, DuPage, Grundy, Kane and 8 more91 min
Apr 4, 2:35 PM CSTTornado WatchSPCBond, Champaign, Christian, Clark, Clay, Clinton and 26 more5 hr
Apr 4, 3:10 PM CSTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Coles, Cumberland and 25 more2 hr
Apr 4, 4:25 PM CSTTornado WatchSPCAlexander, Bond, Clay, Clinton, Edwards, Franklin and 24 more6 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.