Alert archive / North Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 2072

August 28, 201114 counties in North Dakota; 11 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2011, 2:09 AM CDT for 14 counties in North Dakota; 11 counties in South Dakota. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Aug 28, 2011, 2:09 AM CDT (07:09 UTC)
Expired: Aug 28, 2011, 3:15 AM CDT
In force: 66 min
Issued by: the Storm Prediction Center

All 25 counties

Burleigh County, ND, Dickey County, ND, Emmons County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Sioux County, ND, Stark County, ND, Brown County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, McPherson County, SD, Potter County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Bismarck radar (KBIS), 56 km from the middle of the area, began a volume at 07:10 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, 7.2 hours before the alert went out and 54 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: 1716 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 27, 7:30 PM CDT	Mesoscale Discussion	SPC	Burke, Divide, Dunn, McKenzie, McLean, Mountrail and 3 more	90 min
Aug 28, 5:16 AM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 33 more	2 hr
Aug 28, 8:00 AM CDT	Severe Thunderstorm Watch	SPC	Bon Homme, Brookings, Charles Mix, Clay, Davison, Douglas and 12 more	5 hr
Aug 28, 10:41 AM CDT	Mesoscale Discussion	SPC	Clay, Lincoln, Union, Yankton	94 min

Nearby

Mesoscale Discussions in North Dakota, 2011 Mesoscale Discussions in South 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.