Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 2238

September 19, 200520 counties in Illinois; Knox County, Indiana; 16 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Sep 19, 2005, 8:18 PM CDT for 20 counties in Illinois; Knox County, Indiana; 16 counties in Missouri. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Sep 19, 2005, 8:18 PM CDT (01:18 UTC)
Expired: Sep 19, 2005, 10:15 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center

All 37 counties

Bond County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Richland County, IL, Saint Clair County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, Knox County, IN, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 67 km from the middle of the area, began a volume at 01:21 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

Davenport, (KDVN), launched 00:00Z, 1.3 hours before the alert went out and 335 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1893 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1027 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Mesoscale Discussions in Illinois, 2005 Mesoscale Discussions in Missouri, 2005 Mesoscale Discussions in Indiana, 2005 Every mesoscale discussion in 2005

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.