Alert archive / South Dakota / Mesoscale Discussions in 2013

Mesoscale Discussion 1035

June 11, 20137 counties in Montana; 9 counties in South Dakota; Campbell County, Crook County, Weston County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2013, 6:23 PM MDT for 7 counties in Montana; 9 counties in South Dakota; Campbell County, Crook County, Weston County, Wyoming. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jun 11, 2013, 6:23 PM MDT (00:23 UTC)
Expired: Jun 11, 2013, 8:00 PM MDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Garfield County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Treasure County, MT, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Campbell County, WY, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 197 km from the middle of the area, began a volume at 00:23 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 297Jun 11, 6:40 PM MDT

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 0.4 hours before the alert went out and 197 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: 1471 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 619 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 190 m²/s²
0-3 km storm-relative helicity: 323 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 9.4

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, 2:04 PM MDT	Mesoscale Discussion	SPC	Blaine, Broadwater, Cascade, Chouteau, Fergus, Gallatin and 14 more	56 min
Jun 12, 2:27 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Broadwater, Cascade, Chouteau, Fergus, Gallatin and 13 more	7 hr
Jun 12, 4:06 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Powder River, Rosebud	54 min
Jun 12, 5:01 PM MDT	Mesoscale Discussion	SPC	Blaine, Broadwater, Cascade, Chouteau, Gallatin, Hill and 5 more	59 min
Jun 11, 6:42 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Custer, Haakon, Jackson, Lawrence and 3 more	5 hr
Jun 11, 8:16 PM MDT	Mesoscale Discussion	SPC	Bennett, Butte, Custer, Fall River, Haakon, Jackson and 5 more	59 min
Jun 11, 9:48 PM MDT	Mesoscale Discussion	SPC	Bennett, Custer, Dewey, Haakon, Hughes, Jackson and 11 more	87 min
Jun 11, 10:12 PM MDT	Mesoscale Discussion	SPC	Bon Homme, Clay, Lincoln, Minnehaha, Turner, Union and 1 more	2 hr
Jun 12, 3:37 AM MDT	Mesoscale Discussion	SPC	Brookings, Codington, Deuel, Grant, Hamlin, Roberts	2 hr

Nearby

Mesoscale Discussions in South Dakota, 2013 Mesoscale Discussions in Montana, 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.