Alert archive / South Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1056

June 18, 2014Adams County, Grant County, Sioux County, North Dakota; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2014, 12:19 AM MDT for Adams County, Grant County, Sioux County, North Dakota; 10 counties in South Dakota. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Jun 18, 2014, 12:19 AM MDT (06:19 UTC)
Expired: Jun 18, 2014, 1:15 AM MDT
In force: 56 min
Issued by: the Storm Prediction Center

Counties Adams County, ND, Grant County, ND, Sioux County, ND, Butte County, SD, Corson County, SD, Custer County, SD, Dewey County, SD, Haakon County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 114 km from the middle of the area, began a volume at 06:20 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

Rapid City, SD (KRAP), launched 00:00Z, 6.3 hours before the alert went out and 121 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: 3730 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 846 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 7.1

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 18, 12:13 PM MDT	Mesoscale Discussion	SPC	Emmons, Grant, Kidder, Logan, McIntosh, Morton and 1 more	92 min
Jun 18, 12:28 PM MDT	Tornado Watch	SPC	Adams, Burleigh, Emmons, Grant, Hettinger, Kidder and 7 more	9 hr
Jun 18, 4:23 PM MDT	Mesoscale Discussion	SPC	Barnes, Burleigh, Dickey, Emmons, Foster, Griggs and 7 more	97 min
Jun 17, 6:33 PM MDT	Mesoscale Discussion	SPC	Butte, Harding	27 min
Jun 17, 7:58 PM MDT	Severe Thunderstorm Watch	SPC	Butte, Custer, Fall River, Haakon, Harding, Lawrence and 4 more	5 hr
Jun 17, 9:18 PM MDT	Mesoscale Discussion	SPC	Bon Homme, Clay, Hanson, Hutchinson, Lake, Lincoln and 7 more	57 min
Jun 17, 10:01 PM MDT	Mesoscale Discussion	SPC	Clay, Lincoln, McCook, Minnehaha, Turner, Union and 1 more	29 min
Jun 17, 10:23 PM MDT	Mesoscale Discussion	SPC	Clay, Lake, Lincoln, Minnehaha, Moody, Union	37 min
Jun 17, 10:39 PM MDT	Tornado Watch	SPC	Clay, Hanson, Hutchinson, Lake, Lincoln, McCook and 5 more	5 hr
Jun 18, 12:52 AM MDT	Mesoscale Discussion	SPC	Clay, Lincoln, Union	83 min
Jun 18, 3:45 AM MDT	Mesoscale Discussion	SPC	Campbell, Corson, Dewey, Haakon, Hughes, Hyde and 10 more	90 min
Jun 18, 2:29 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 23 more	91 min
Jun 18, 5:23 PM MDT	Tornado Watch	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more	5 hr

Nearby

Mesoscale Discussions in South Dakota, 2014 Mesoscale Discussions in North Dakota, 2014 Every mesoscale discussion in 2014

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.