Alert archive / South Dakota / Mesoscale Discussions in 2010

Mesoscale Discussion 1049

June 21, 2010Grant County, Hettinger County, Sioux County, North Dakota; 14 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2010, 12:36 AM MDT for Grant County, Hettinger County, Sioux County, North Dakota; 14 counties in South Dakota. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2010, 12:36 AM MDT (06:36 UTC)
Expired: Jun 21, 2010, 1:00 AM MDT
In force: 24 min
Issued by: the Storm Prediction Center

Counties Grant County, ND, Hettinger County, ND, Sioux County, ND, Buffalo County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 177 km from the middle of the area, began a volume at 06:39 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, 6.6 hours before the alert went out and 177 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: 1174 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1617 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -2.1

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
Jun 20, 6:43 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Bowman, Grant, Hettinger, Sioux, Slope	6 hr
Jun 20, 8:35 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 28 more	55 min
Jun 20, 8:57 PM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more	7 hr
Jun 21, 3:43 AM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more	32 min
Jun 21, 1:36 PM MDT	Mesoscale Discussion	SPC	Butte, Harding, Lawrence	114 min
Jun 21, 2:08 PM MDT	Tornado Watch	SPC	Butte, Custer, Fall River, Harding, Lawrence, Meade and 1 more	7 hr

Nearby

Mesoscale Discussions in South Dakota, 2010 Mesoscale Discussions in North Dakota, 2010 Every mesoscale discussion in 2010

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.