Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 2066

August 2, 200315 counties in Illinois; 10 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2003, 9:11 PM CDT for 15 counties in Illinois; 10 counties in Missouri. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Aug 2, 2003, 9:11 PM CDT (02:11 UTC)
Expired
Aug 2, 2003, 10:45 PM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 25 counties

Bond County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, Effingham County, IL, Fayette County, IL, Jasper County, IL, Jersey County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, City of Saint Louis, MO, Cole County, MO, Franklin County, MO, Gasconade County, MO, Miller County, MO, Moniteau County, MO, Osage County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.2 hours before the alert went out and 317 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, Springfield, MO at 00:00Z on 2003-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 732 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, Springfield, MO at 00:00Z on 2003-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 square meters per square second.19395878Sfc1 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
732 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
1454 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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
Aug 3, 2:20 PM CDTSevere Thunderstorm WatchSPCAlexander, Bond, Clay, Clinton, Crawford, Edwards and 28 more6 hr
Aug 3, 3:25 PM CDTMesoscale DiscussionSPCAlexander, Hardin, Jackson, Johnson, Massac, Pope and 3 more2 hr
Aug 3, 6:15 PM CDTMesoscale DiscussionSPCBureau, Champaign, Ford, Grundy, Henry, Iroquois and 10 more105 min
Aug 3, 5:38 PM CDTMesoscale DiscussionSPCBarry, Carter, Christian, Douglas, Howell, Jasper and 8 more2 hr

Nearby

Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Missouri, 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.