Alert archive / South Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1201

June 12, 201117 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2011, 8:55 PM MDT for 17 counties in South Dakota. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2011, 8:55 PM MDT (02:55 UTC)
Expired: Jun 12, 2011, 10:00 PM MDT
In force: 65 min
Issued by: the Storm Prediction Center

Counties Bennett County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Hughes County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 126 km from the middle of the area, began a volume at 02:55 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

Aberdeen, SD (KABR), launched 00:00Z, 2.9 hours before the alert went out and 242 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: 70 J/kg
Mixed-layer CIN: -309 J/kg
Mixed-layer LCL: 1253 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 192 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 12, 6:07 PM MDT	Mesoscale Discussion	SPC	Brown, Buffalo, Corson, Dewey, Edmunds, Faulk and 16 more	53 min
Jun 12, 6:33 PM MDT	Severe Thunderstorm Watch	SPC	Buffalo, Campbell, Corson, Dewey, Haakon, Hughes and 12 more	6 hr
Jun 13, 12:44 AM MDT	Mesoscale Discussion	SPC	Jones, Lyman, Mellette, Todd, Tripp	61 min
Jun 13, 1:53 PM MDT	Mesoscale Discussion	SPC	Lyman, Mellette, Todd, Tripp	2 hr
Jun 13, 4:24 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Fall River, Jackson, Mellette, Todd, Tripp	7 hr

Nearby

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.