Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 2059

October 5, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Oct 5, 2007, 9:51 PM CDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Oct 5, 2007, 9:51 PM CDT (02:51 UTC)
Expired: Oct 5, 2007, 11:15 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

All 36 counties

Lyon County, IA, Plymouth County, IA, Sioux County, IA, Pipestone County, MN, Rock 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, Rock County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld 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, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 129 km from the middle of the area, began a volume at 02:51 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, 2.9 hours before the alert went out and 222 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: 1017 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 680 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

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
Oct 6, 5:02 PM CDT	Mesoscale Discussion	SPC	Big Stone, Clay, Grant, Traverse, Wilkin	88 min

Nearby

Mesoscale Discussions in South Dakota, 2007 Mesoscale Discussions in Nebraska, 2007 Mesoscale Discussions in Iowa, 2007 Every mesoscale discussion in 2007

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.