Alert archive / South Dakota / Mesoscale Discussions in 2013

Mesoscale Discussion 1149

June 21, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2013, 6:49 AM MDT for 4 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2013, 6:49 AM MDT (12:49 UTC)
Expired: Jun 21, 2013, 7:45 AM MDT
In force: 56 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Carter County, MT, Adams County, ND, Bowman County, ND, Grant County, ND, Hettinger County, ND, Butte County, SD, Custer County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 135 km from the middle of the area, began a volume at 12:49 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 335Jun 21, 8:10 AM MDT

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 0.8 hours before the alert went out and 140 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: 1809 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 494 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 287 m²/s²
Significant tornado parameter: 0.6
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
Jun 20, 8:37 PM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Dickey, LaMoure, Logan, McIntosh and 3 more	23 min
Jun 21, 8:09 AM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Bennett, Brown, Brule, Buffalo and 36 more	7 hr
Jun 21, 11:01 AM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bennett, Brule, Buffalo, Butte and 29 more	89 min
Jun 21, 12:34 PM MDT	Mesoscale Discussion	SPC	Brookings, Clark, Codington, Deuel, Grant, Hamlin and 5 more	56 min
Jun 21, 12:58 PM MDT	Tornado Watch	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 27 more	7 hr
Jun 21, 1:48 PM MDT	Severe Thunderstorm Watch	SPC	Butte, Custer, Fall River, Harding, Lawrence, Meade and 2 more	8 hr
Jun 21, 2:49 PM MDT	Mesoscale Discussion	SPC	Brookings, Deuel, Grant, Lake, Moody	86 min
Jun 21, 4:59 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Faulk, Gregory and 9 more	91 min
Jun 21, 5:31 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Haakon, Jackson, Mellette, Todd, Tripp	6 hr
Jun 21, 1:12 PM MDT	Mesoscale Discussion	SPC	Goshen, Niobrara, Weston	93 min

Nearby

Mesoscale Discussions in South Dakota, 2013 Mesoscale Discussions in North Dakota, 2013 Mesoscale Discussions in Wyoming, 2013 Every mesoscale discussion in 2013

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.