Alert archive / South Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1189

June 11, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2011, 7:11 PM MDT for 4 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 11, 2011, 7:11 PM MDT (01:11 UTC)
Expired: Jun 11, 2011, 8:15 PM MDT
In force: 64 min
Issued by: the Storm Prediction Center

All 24 counties

Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Adams County, ND, Bowman County, ND, Hettinger County, ND, Slope County, ND, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Campbell County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 149 km from the middle of the area, began a volume at 01:10 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

Rapid City, SD (KUNR), launched 00:00Z, 1.2 hours before the alert went out and 151 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: 1009 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1217 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 11.8

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, 12:52 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Dawson, Fallon, Powder River, Prairie and 1 more	53 min
Jun 12, 1:49 PM MDT	Tornado Watch	SPC	Carter, Custer, Fallon, Powder River	6 hr
Jun 12, 5:07 PM MDT	Mesoscale Discussion	SPC	Bottineau, Burke, Burleigh, Dunn, Emmons, Grant and 19 more	53 min
Jun 12, 5:28 PM MDT	Tornado Watch	SPC	Adams, Billings, Bottineau, Bowman, Burke, Burleigh and 30 more	6 hr
Jun 11, 6:07 PM MDT	Mesoscale Discussion	SPC	Goshen, Laramie, Niobrara, Platte	53 min

Nearby

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