Alert archive / Missouri / Mesoscale Discussions in 2004

Mesoscale Discussion 2116

August 25, 2004Adams County, Hancock County, Illinois; 8 counties in Iowa; 21 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2004, 9:57 PM CDT for Adams County, Hancock County, Illinois; 8 counties in Iowa; 21 counties in Missouri. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Aug 25, 2004, 9:57 PM CDT (02:57 UTC)
Expired: Aug 25, 2004, 11:30 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 31 counties

Appanoose County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Van Buren County, IA, Wayne County, IA, Adams County, IL, Hancock County, IL, Adair County, MO, Chariton County, MO, Clark County, MO, Daviess County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Monroe County, MO, Putnam County, MO, Ralls County, MO, Randolph County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.0 hours before the alert went out and 243 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: 1111 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 904 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 282 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 7.0

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.

Issued	Product	Office	Counties	Lasted
Aug 25, 7:47 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Calhoun, Cass, Champaign, Christian and 48 more	58 min
Aug 26, 3:50 PM CDT	Mesoscale Discussion	SPC	Calhoun, Monroe	115 min
Aug 26, 2:29 PM CDT	Mesoscale Discussion	SPC	Allamakee, Audubon, Black Hawk, Boone, Bremer, Buchanan and 39 more	2 hr
Aug 26, 4:10 PM CDT	Tornado Watch	SPC	Adair, Adams, Allamakee, Audubon, Benton, Black Hawk and 56 more	6 hr
Aug 25, 9:35 PM CDT	Mesoscale Discussion	SPC	Bates, Cass, Jackson	55 min

Nearby

Mesoscale Discussions in Missouri, 2004 Mesoscale Discussions in Iowa, 2004 Mesoscale Discussions in Illinois, 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.