Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1753

July 9, 200317 counties in Iowa; 6 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2003, 10:00 PM CDT for 17 counties in Iowa; 6 counties in Minnesota. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 9, 2003, 10:00 PM CDT (03:00 UTC)
Expired: Jul 9, 2003, 11:00 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

All 23 counties

Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Kossuth County, IA, Mitchell County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Mower County, MN, Steele County, MN, Waseca County, MN

The radar

The La Crosse radar (KARX), 157 km from the middle of the area, began a volume at 03:03 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

Minneapolis, MN (KMPX), launched 00:00Z, 3.0 hours before the alert went out and 187 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: 166 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

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 9, 7:43 PM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 18 more	32 min
Jul 9, 7:50 PM CDT	Tornado Watch	SPC	Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw, Floyd and 10 more	5 hr
Jul 9, 8:04 PM CDT	Mesoscale Discussion	SPC	Davis, Des Moines, Henry, Jefferson, Lee, Louisa and 3 more	56 min
Jul 9, 8:20 PM CDT	Severe Thunderstorm Watch	SPC	Des Moines, Henry, Iowa, Jefferson, Johnson, Keokuk and 5 more	6 hr

Nearby

Mesoscale Discussions in Iowa, 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.