Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 1802

August 19, 200715 counties in Illinois; 39 counties in Iowa; 14 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2007, 1:20 PM CDT for 15 counties in Illinois; 39 counties in Iowa; 14 counties in Minnesota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 19, 2007, 1:20 PM CDT (18:20 UTC)
Expired: Aug 19, 2007, 4:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 68 counties

Appanoose County, IA, Benton County, IA, Cedar County, IA, Chickasaw County, IA, Clarke County, IA, Clayton County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Henry County, IA, Howard County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Mitchell County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Winneshiek County, IA, Worth County, IA, DeKalb County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Kendall County, IL, Knox County, IL, Marshall County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Warren County, IL, Woodford County, IL, Cottonwood County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Le Sueur County, MN, Martin County, MN, Murray County, MN, Olmsted County, MN, Pipestone County, MN, Rice County, MN, Steele County, MN, Wabasha County, MN, Watonwan County, MN, Winona County, MN

The radar

The Des Moines radar (KDMX), 153 km from the middle of the area, began a volume at 18:21 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 12:00Z, 6.3 hours before the alert went out and 224 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 510 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 19, 6:12 AM CDT	Mesoscale Discussion	SPC	Boone, Carroll, DeKalb, Jo Daviess, Kane, Ogle and 2 more	93 min
Aug 19, 6:25 PM CDT	Mesoscale Discussion	SPC	Bond, Brown, Calhoun, Cass, Champaign, Christian and 31 more	2 hr
Aug 18, 8:03 PM CDT	Mesoscale Discussion	SPC	Allamakee, Dickinson, Emmet, Howard, Mitchell, Winnebago and 2 more	3 hr
Aug 18, 11:10 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Cerro Gordo, Cherokee, Clay, Dickinson and 21 more	110 min

Nearby

Mesoscale Discussions in Iowa, 2007 Mesoscale Discussions in Illinois, 2007 Mesoscale Discussions in Minnesota, 2007 Every mesoscale discussion in 2007

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.