Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 984

May 29, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 29, 2004, 9:21 PM CDT for 4 states. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 29, 2004, 9:21 PM CDT (02:21 UTC)
Expired: May 29, 2004, 10:15 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

All 95 counties

Buena Vista County, IA, Calhoun County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon 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, Webster County, IA, Woodbury County, IA, Big Stone County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Sibley County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Watonwan County, MN, Yellow Medicine County, MN, Antelope County, NE, Boyd County, NE, Cedar County, NE, Dakota County, NE, Dixon County, NE, Holt County, NE, Knox County, NE, Pierce County, NE, Wayne County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Marshall County, SD, McCook County, SD, McPherson County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 53 km from the middle of the area, began a volume at 02:21 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

Omaha, NE (KOAX), launched 00:00Z, 2.4 hours before the alert went out and 238 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: 1892 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 1114 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.1

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
May 29, 8:45 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Carroll, Cass, Crawford and 15 more	60 min
May 29, 9:35 PM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 26 more	6 hr
May 29, 11:23 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Carroll, Cass, Crawford and 13 more	67 min
May 30, 2:38 AM CDT	Mesoscale Discussion	SPC	Appanoose, Clarke, Davis, Decatur, Jasper, Keokuk and 13 more	97 min
May 30, 9:40 AM CDT	Mesoscale Discussion	SPC	Appanoose, Davis, Lee, Van Buren	3 hr
May 30, 12:13 PM CDT	Mesoscale Discussion	SPC	Cedar, Clayton, Clinton, Delaware, Des Moines, Dubuque and 14 more	2 hr
May 30, 12:25 PM CDT	Tornado Watch	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 37 more	7 hr
May 30, 3:16 PM CDT	Mesoscale Discussion	SPC	Clinton, Des Moines, Dubuque, Jackson, Louisa, Muscatine and 1 more	119 min
May 29, 7:04 PM CDT	Mesoscale Discussion	SPC	Becker, Clay, Douglas, Grant, Norman, Otter Tail and 2 more	116 min
May 30, 2:45 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Carver, Chisago, Dakota, Dodge and 20 more	2 hr

Nearby

Mesoscale Discussions in South Dakota, 2004 Mesoscale Discussions in Minnesota, 2004 Mesoscale Discussions in Iowa, 2004 Every mesoscale discussion in 2004

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.