Alert archive / South Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 762

May 1, 200811 counties in Iowa; 8 counties in Minnesota; 15 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 1, 2008, 7:47 PM CDT for 11 counties in Iowa; 8 counties in Minnesota; 15 counties in South Dakota. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 1, 2008, 7:47 PM CDT (00:47 UTC)
Expired: May 1, 2008, 9:15 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center

All 34 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Beadle County, SD, Brookings County, SD, Davison County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 40 km from the middle of the area, began a volume at 00:47 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

Aberdeen, SD (KABR), launched 00:00Z, 0.8 hours before the alert went out and 161 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: 1220 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 270 m²/s²
0-3 km storm-relative helicity: 338 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
May 1, 7:24 PM CDT	Mesoscale Discussion	SPC	Decatur, Ringgold, Wayne	66 min
May 1, 10:04 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Boone, Clarke, Dallas and 19 more	116 min
May 1, 11:29 PM CDT	Mesoscale Discussion	SPC	Appanoose, Clarke, Davis, Decatur, Jefferson, Keokuk and 10 more	91 min
May 2, 11:05 AM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 32 more	115 min
May 2, 3:47 PM CDT	Mesoscale Discussion	SPC	Allamakee, Howard, Winneshiek	118 min
May 1, 8:28 PM CDT	Mesoscale Discussion	SPC	Big Stone, Blue Earth, Brown, Carver, Chippewa, Dakota and 13 more	92 min

Nearby

Mesoscale Discussions in South Dakota, 2008 Mesoscale Discussions in Iowa, 2008 Mesoscale Discussions in Minnesota, 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.