Alert archive / South Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1399

June 26, 20117 counties in North Dakota; 16 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2011, 12:35 PM CDT for 7 counties in North Dakota; 16 counties in South Dakota. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jun 26, 2011, 12:35 PM CDT (17:35 UTC)
Expired: Jun 26, 2011, 2:00 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

All 23 counties

Cass County, ND, Dickey County, ND, Emmons County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Ransom County, ND, Brown County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, McPherson County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Aberdeen radar (KABR), 132 km from the middle of the area, began a volume at 17:36 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 557Jun 26, 1:05 PM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 5.6 hours before the alert went out and 179 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1571 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -116 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 25, 8:01 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Benson, Burleigh, Cavalier, Eddy, Emmons and 22 more	5 hr
Jun 25, 10:47 PM CDT	Mesoscale Discussion	SPC	Emmons, Grand Forks, Griggs, Logan, Stutsman	88 min
Jun 26, 6:08 AM CDT	Mesoscale Discussion	SPC	Adams, Sioux	97 min
Jun 25, 8:14 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Buffalo, Butte, Custer, Faulk, Haakon and 16 more	6 hr
Jun 25, 11:27 PM CDT	Mesoscale Discussion	SPC	Corson, Dewey, Haakon, Hughes, Jones, Lyman and 8 more	63 min
Jun 26, 6:16 AM CDT	Mesoscale Discussion	SPC	Bon Homme, Charles Mix, Clay, Douglas, Gregory, Hutchinson and 4 more	59 min
Jun 26, 10:44 AM CDT	Mesoscale Discussion	SPC	Bennett, Jackson, Mellette, Todd, Tripp	2 hr
Jun 26, 1:03 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Bennett, Brule, Buffalo, Charles Mix, Custer and 18 more	7 hr
Jun 26, 2:30 PM CDT	Mesoscale Discussion	SPC	Aurora, Bennett, Brule, Buffalo, Charles Mix, Douglas and 13 more	2 hr

Nearby

Mesoscale Discussions in South Dakota, 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.