Alert archive / South Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 702

May 8, 201110 counties in Nebraska; 4 counties in North Dakota; 17 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 8, 2011, 8:47 PM CDT for 10 counties in Nebraska; 4 counties in North Dakota; 17 counties in South Dakota. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: May 8, 2011, 8:47 PM CDT (01:47 UTC)
Expired: May 8, 2011, 9:45 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 31 counties

Emmons County, ND, Grant County, ND, Morton County, ND, Sioux County, ND, Antelope County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Garfield County, NE, Holt County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Wheeler County, NE, Brule County, SD, Buffalo County, SD, Campbell County, SD, Charles Mix County, SD, Corson County, SD, Dewey County, SD, Gregory County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Tripp County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 181 km from the middle of the area, began a volume at 01:49 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, 1.8 hours before the alert went out and 169 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: 1839 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 413 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

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 9, 3:26 PM CDT	Severe Thunderstorm Watch	SPC	Box Butte, Dawes, Scotts Bluff, Sheridan, Sioux	7 hr
May 9, 5:57 PM CDT	Mesoscale Discussion	SPC	Box Butte, Dawes, Morrill, Scotts Bluff, Sioux	93 min

Nearby

Mesoscale Discussions in South Dakota, 2011 Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in North Dakota, 2011 Every mesoscale discussion in 2011

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.