Alert archive / South Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1983

August 14, 20116 counties in North Dakota; 13 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 14, 2011, 8:42 PM CDT for 6 counties in North Dakota; 13 counties in South Dakota. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Aug 14, 2011, 8:42 PM CDT (01:42 UTC)
Expired: Aug 14, 2011, 10:15 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

Counties Emmons County, ND, Grant County, ND, Logan County, ND, McIntosh County, ND, Morton County, ND, Sioux County, ND, Brown County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hyde County, SD, McPherson County, SD, Potter County, SD, Spink County, SD, Sully County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 126 km from the middle of the area, began a volume at 01:43 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.7 hours before the alert went out and 124 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: 1399 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1398 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 7.2

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
Aug 15, 3:22 AM CDT	Mesoscale Discussion	SPC	Burleigh, McLean, Mercer, Morton, Oliver	2 hr
Aug 15, 3:47 PM CDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Dunn, Grant, Hettinger and 7 more	58 min
Aug 15, 5:23 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Billings, Bowman, Burleigh, Dunn, Emmons and 21 more	9 hr

Nearby

Mesoscale Discussions in South Dakota, 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.