Alert archive / Iowa / Mesoscale Discussions in 2008

Mesoscale Discussion 2179

August 27, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2008, 10:16 PM CDT for 4 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Aug 27, 2008, 10:16 PM CDT (03:16 UTC)
Expired: Aug 28, 2008, 12:15 AM CDT
In force: 119 min
Issued by: the Storm Prediction Center

All 76 counties

Allamakee County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Jasper County, IA, Kossuth County, IA, Marshall County, IA, Mitchell County, IA, Monona County, IA, O'Brien County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Jackson County, MN, Martin County, MN, Mower County, MN, Olmsted County, MN, Rice County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Winona County, MN, Burt County, NE, Cuming County, NE, Dakota County, NE, Dodge County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Buffalo County, WI, La Crosse County, WI, Trempealeau County, WI

The radar

The Des Moines radar (KDMX), 117 km from the middle of the area, began a volume at 03:18 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

Omaha, NE (KOAX), launched 00:00Z, 3.3 hours before the alert went out and 233 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: 2646 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 920 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 392 m²/s²
Significant tornado parameter: 3.5
Supercell composite: 29.1

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
Aug 28, 2:48 PM CDT	Mesoscale Discussion	SPC	Appanoose, Davis, Des Moines, Henry, Jefferson, Lee and 7 more	87 min
Aug 28, 3:22 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Clarke, Davis, Decatur, Des Moines, Henry and 12 more	7 hr
Aug 28, 2:09 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Beltrami, Benton, Brown, Carlton and 37 more	96 min

Nearby

Mesoscale Discussions in Iowa, 2008 Mesoscale Discussions in Minnesota, 2008 Mesoscale Discussions in Nebraska, 2008 Every mesoscale discussion in 2008

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.