Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 2204

August 20, 20035 states

The Storm Prediction Center issued this mesoscale discussion at Aug 20, 2003, 6:09 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 20, 2003, 6:09 PM CDT (23:09 UTC)
Expired: Aug 20, 2003, 8:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 91 counties

Allamakee County, IA, Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hardin County, IA, Henry County, IA, Howard County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Winneshiek County, IA, Carroll County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, McDonough County, IL, Mercer County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Clark County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Adams County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Monroe County, WI, Richland County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Waushara County, WI

The radar

The Quad Cities radar (KDVN), 138 km from the middle of the area, began a volume at 23:12 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 12:00Z, 11.2 hours before the alert went out and 142 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: 641 J/kg
Mixed-layer CIN: -231 J/kg
Mixed-layer LCL: 1398 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 96 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.

Issued	Product	Office	Counties	Lasted
Aug 20, 2:15 PM CDT	Mesoscale Discussion	SPC	Adams, Hancock, Henderson, Mercer	90 min
Aug 20, 2:50 PM CDT	Severe Thunderstorm Watch	SPC	Carroll, Fulton, Hancock, Henderson, Henry, Jo Daviess and 8 more	5 hr
Aug 20, 5:27 PM CDT	Mesoscale Discussion	SPC	Calhoun, Greene, Jersey, Monroe, Pike	2 hr
Aug 20, 2:11 PM CDT	Mesoscale Discussion	SPC	Chisago, Goodhue, Houston, Pine, Wabasha, Washington and 1 more	2 hr
Aug 20, 3:45 PM CDT	Tornado Watch	SPC	Aitkin, Carlton, Chisago, Itasca, Kanabec, Lake and 2 more	5 hr
Aug 20, 3:26 PM CDT	Mesoscale Discussion	SPC	Bates, Buchanan, Caldwell, Carroll, Cass, Chariton and 19 more	94 min
Aug 20, 4:10 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Buchanan, Caldwell, Carroll, Cass, Chariton and 15 more	5 hr

Nearby

Mesoscale Discussions in Iowa, 2003 Mesoscale Discussions in Wisconsin, 2003 Mesoscale Discussions in Illinois, 2003 Every 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; radar from the NEXRAD Level II archive.