Alert archive / South Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1394

June 26, 2011Cherry County, Keya Paha County, Nebraska; Adams County, Sioux County, North Dakota; 30 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2011, 5:08 AM MDT for Cherry County, Keya Paha County, Nebraska; Adams County, Sioux County, North Dakota; 30 counties in South Dakota. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Jun 26, 2011, 5:08 AM MDT (11:08 UTC)
Expired
Jun 26, 2011, 6:45 AM MDT
In force
97 min
Issued by
the Storm Prediction Center
All 34 counties

Adams County, ND, Sioux County, ND, Cherry County, NE, Keya Paha County, NE, Aurora County, SD, Bennett County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins 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), 127 km from the middle of the area, began a volume at 11:09 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, 11.1 hours before the alert went out and 133 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-pSkew-T log-p diagram, Rapid City, SD at 00:00Z on 2011-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2491 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 2011-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
2491 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
1311 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
241 m²/s²
Significant tornado parameter
2.6
Supercell composite
23.3

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.

IssuedProductOfficeCountiesLasted
Jun 25, 7:14 PM MDTSevere Thunderstorm WatchSPCBrown, Cherry, Keya Paha, Rock, Sheridan6 hr
Jun 25, 10:27 PM MDTMesoscale DiscussionSPCBrown, Cherry, Keya Paha63 min
Jun 26, 5:16 AM MDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Brown, Burt, Butler and 40 more59 min
Jun 26, 9:44 AM MDTMesoscale DiscussionSPCBrown, Cherry, Grant, Hooker, Keya Paha, Sheridan and 1 more2 hr
Jun 26, 12:03 PM MDTSevere Thunderstorm WatchSPCBlaine, Boyd, Brown, Cherry, Garfield, Grant and 8 more7 hr
Jun 26, 1:30 PM MDTMesoscale DiscussionSPCAntelope, Banner, Blaine, Boone, Box Butte, Boyd and 22 more2 hr
Jun 26, 2:09 PM MDTMesoscale DiscussionSPCAdams, Boone, Butler, Cass, Clay, Colfax and 20 more2 hr
Jun 26, 3:56 PM MDTSevere Thunderstorm WatchSPCAntelope, Boone, Burt, Butler, Cass, Cedar and 26 more7 hr
Jun 25, 7:01 PM MDTSevere Thunderstorm WatchSPCAdams, Benson, Burleigh, Cavalier, Eddy, Emmons and 22 more5 hr
Jun 25, 9:47 PM MDTMesoscale DiscussionSPCEmmons, Grand Forks, Griggs, Logan, Stutsman88 min
Jun 26, 11:35 AM MDTMesoscale DiscussionSPCCass, Dickey, Emmons, LaMoure, Logan, McIntosh and 1 more85 min

Nearby

Mesoscale Discussions in South Dakota, 2011Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in North Dakota, 2011Every 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.