Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 2029

July 31, 200321 counties in Iowa; Houston County, Minnesota; 11 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2003, 10:28 AM CDT for 21 counties in Iowa; Houston County, Minnesota; 11 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 31, 2003, 10:28 AM CDT (15:28 UTC)
Expired: Jul 31, 2003, 12:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 33 counties

Allamakee County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Mitchell County, IA, Story County, IA, Webster County, IA, Winneshiek County, IA, Wright County, IA, Houston County, MN, Adams County, WI, Columbia County, WI, Crawford County, WI, Green Lake County, WI, Juneau County, WI, Marquette County, WI, Monroe County, WI, Richland County, WI, Sauk County, WI, Vernon County, WI, Waushara County, WI

The radar

The La Crosse radar (KARX), 111 km from the middle of the area, began a volume at 15:28 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 817Jul 31, 12:00 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 3.5 hours before the alert went out and 209 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: 51 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1404 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 61 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
Jul 31, 12:00 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Chickasaw and 9 more	6 hr
Jul 31, 2:38 PM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 9 more	2 hr
Jul 31, 5:07 PM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 12 more	53 min
Jul 31, 5:40 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 18 more	5 hr
Jul 30, 8:05 PM CDT	Mesoscale Discussion	SPC	Big Stone, Grant, Stevens, Traverse, Wilkin	115 min

Nearby

Mesoscale Discussions in Iowa, 2003 Mesoscale Discussions in Wisconsin, 2003 Mesoscale Discussions in Minnesota, 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.