Alert archive / Iowa / Mesoscale Discussions in 2008

Mesoscale Discussion 1699

July 6, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2008, 2:36 PM CDT for 4 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Jul 6, 2008, 2:36 PM CDT (19:36 UTC)
Expired: Jul 6, 2008, 4:30 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center

All 66 counties

Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Hancock County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Blue Earth County, MN, Brown County, MN, Carver County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Rice County, MN, Rock County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Burt County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Clay County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 110 km from the middle of the area, began a volume at 19:36 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 661Jul 6, 3:05 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.6 hours before the alert went out and 229 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: 2155 J/kg
Mixed-layer CIN: -356 J/kg
Mixed-layer LCL: 1374 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 6, 5:48 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Clarke, Davis, Decatur and 24 more	117 min
Jul 6, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	Audubon, Black Hawk, Bremer, Buena Vista, Butler, Calhoun and 32 more	7 hr
Jul 6, 5:38 PM CDT	Mesoscale Discussion	SPC	Allamakee, Chickasaw, Floyd, Howard, Mitchell, Winneshiek	2 hr
Jul 6, 6:54 PM CDT	Mesoscale Discussion	SPC	Allamakee, Audubon, Boone, Bremer, Buena Vista, Butler and 36 more	66 min
Jul 5, 8:15 PM CDT	Mesoscale Discussion	SPC	Clay, Kittson, Marshall, Norman, Pennington, Polk and 3 more	60 min
Jul 5, 10:51 PM CDT	Mesoscale Discussion	SPC	Kittson, Marshall, Pennington, Polk, Red Lake, Roseau	54 min
Jul 5, 7:38 PM CDT	Mesoscale Discussion	SPC	Blaine, Boyd, Brown, Custer, Holt, Hooker and 7 more	67 min
Jul 6, 3:26 PM CDT	Mesoscale Discussion	SPC	Arthur, Chase, Cheyenne, Deuel, Dundy, Frontier and 10 more	2 hr
Jul 6, 2:14 PM CDT	Mesoscale Discussion	SPC	Custer, Lawrence	61 min
Jul 6, 2:32 PM CDT	Severe Thunderstorm Watch	SPC	Butte, Custer, Harding, Lawrence, Meade, Pennington and 1 more	7 hr

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.