Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 2114

August 25, 200454 counties in Illinois; Ballard County, Kentucky; 46 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2004, 7:47 PM CDT for 54 counties in Illinois; Ballard County, Kentucky; 46 counties in Missouri. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Aug 25, 2004, 7:47 PM CDT (00:47 UTC)
Expired: Aug 25, 2004, 8:45 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 101 counties

Alexander County, IL, Bond County, IL, Calhoun County, IL, Cass 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, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Bollinger County, MO, Butler County, MO, Camden County, MO, Cape Girardeau County, MO, Carter County, MO, Christian County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Perry County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Washington County, MO, Wayne County, MO, Webster County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 32 km from the middle of the area, began a volume at 00:49 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

Springfield, MO (KSGF), launched 00:00Z, 0.8 hours before the alert went out and 321 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: 2692 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 9.7

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.

Issued	Product	Office	Counties	Lasted
Aug 25, 9:57 PM CDT	Mesoscale Discussion	SPC	Adams, Hancock	93 min
Aug 26, 3:50 PM CDT	Mesoscale Discussion	SPC	Calhoun, Monroe	115 min
Aug 25, 9:35 PM CDT	Mesoscale Discussion	SPC	Bates, Cass, Jackson	55 min
Aug 26, 4:10 PM CDT	Tornado Watch	SPC	Atchison, Gentry, Harrison, Holt, Mercer, Nodaway and 1 more	6 hr

Nearby

Mesoscale Discussions in Illinois, 2004 Mesoscale Discussions in Missouri, 2004 Mesoscale Discussions in Kentucky, 2004 Every mesoscale discussion in 2004

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.