Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 2254

September 23, 20046 counties in Minnesota; Dickey County, Sargent County, North Dakota; 12 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 23, 2004, 12:54 PM CDT for 6 counties in Minnesota; Dickey County, Sargent County, North Dakota; 12 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 23, 2004, 12:54 PM CDT (17:54 UTC)
Expired: Sep 23, 2004, 3:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Big Stone County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Traverse County, MN, Yellow Medicine County, MN, Dickey County, ND, Sargent County, ND, Brown County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Marshall County, SD, McPherson County, SD, Roberts County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 44 km from the middle of the area, began a volume at 17:55 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, 5.9 hours before the alert went out and 354 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: 1070 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 215 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
Sep 23, 12:06 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 30 more	114 min
Sep 23, 3:26 PM CDT	Mesoscale Discussion	SPC	Beltrami, Carlton, Clearwater, Itasca, Koochiching, Lake and 1 more	2 hr

Nearby

Mesoscale Discussions in South Dakota, 2004 Mesoscale Discussions in Minnesota, 2004 Mesoscale Discussions in North Dakota, 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.