Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 794

May 6, 200323 counties in Illinois; 10 counties in Indiana; Henderson County, Kentucky

The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 1:23 PM CDT for 23 counties in Illinois; 10 counties in Indiana; Henderson County, Kentucky. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2003, 1:23 PM CDT (18:23 UTC)
Expired
May 6, 2003, 3:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 34 counties

Bond County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Marion County, IL, Perry County, IL, Richland County, IL, Saline County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Daviess County, IN, Dubois County, IN, Gibson County, IN, Knox County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Warrick County, IN, Henderson County, KY

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.4 hours before the alert went out and 278 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, Nashville Metro, TN at 12:00Z on 2003-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Nashville Metro, TN at 12:00Z on 2003-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
862 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
102 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
May 5, 10:58 PM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 9 more2 hr
May 6, 9:37 AM CDTMesoscale DiscussionSPCBond, Clark, Clay, Clinton, Crawford, Cumberland and 15 more113 min
May 6, 11:55 AM CDTSevere Thunderstorm WatchSPCBond, Clay, Clinton, Crawford, Edwards, Effingham and 21 more4 hr
May 6, 5:08 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clinton, Fayette, Jackson, Jefferson and 9 more2 hr
May 6, 5:33 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clinton, Fayette, Jackson, Jefferson and 9 more117 min
May 6, 5:40 PM CDTTornado WatchSPCAlexander, Bond, Clay, Clinton, Crawford, Edwards and 28 more6 hr
May 6, 10:55 AM CDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 23 more2 hr
May 6, 12:45 PM CDTMesoscale DiscussionSPCBarren, Breckinridge, Bullitt, Butler, Casey, Daviess and 20 more2 hr

Nearby

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