Alert archive / South Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1052

June 17, 2014Plymouth County, Sioux County, Iowa; Dakota County, Dixon County, Nebraska; 7 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2014, 11:01 PM CDT for Plymouth County, Sioux County, Iowa; Dakota County, Dixon County, Nebraska; 7 counties in South Dakota. It was in force for 29 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2014, 11:01 PM CDT (04:01 UTC)
Expired: Jun 17, 2014, 11:30 PM CDT
In force: 29 min
Issued by: the Storm Prediction Center

Counties Plymouth County, IA, Sioux County, IA, Dakota County, NE, Dixon County, NE, Clay County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 59 km from the middle of the area, began a volume at 04:03 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.

Tornado Watch 319Jun 17, 11:35 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.0 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: 4092 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1440 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 14.4

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 17, 7:44 PM CDT	Mesoscale Discussion	SPC	Allamakee, Howard, Winneshiek	2 hr
Jun 17, 9:38 PM CDT	Mesoscale Discussion	SPC	Clinton, Jackson	97 min
Jun 17, 10:13 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Buchanan, Chickasaw, Clayton, Clinton, Delaware and 8 more	6 hr
Jun 17, 10:18 PM CDT	Mesoscale Discussion	SPC	Cherokee, Clay, Dickinson, Ida, Lyon, O'Brien and 4 more	57 min
Jun 17, 11:23 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Dickinson, Emmet, Hancock and 11 more	37 min
Jun 17, 11:39 PM CDT	Tornado Watch	SPC	Black Hawk, Bremer, Buena Vista, Butler, Calhoun, Cerro Gordo and 25 more	5 hr
Jun 18, 1:52 AM CDT	Mesoscale Discussion	SPC	Boone, Buena Vista, Calhoun, Carroll, Cerro Gordo, Cherokee and 27 more	83 min
Jun 18, 3:07 AM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 11 more	53 min
Jun 18, 3:47 AM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo and 16 more	4 hr
Jun 18, 5:36 AM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Clayton and 12 more	54 min
Jun 18, 3:29 PM CDT	Mesoscale Discussion	SPC	Lyon, Plymouth, Sioux	91 min
Jun 18, 6:23 PM CDT	Tornado Watch	SPC	Lyon, Plymouth, Sioux, Woodbury	5 hr
Jun 17, 8:29 PM CDT	Mesoscale Discussion	SPC	Cedar	31 min
Jun 17, 7:33 PM CDT	Mesoscale Discussion	SPC	Butte, Harding	27 min
Jun 17, 8:58 PM CDT	Severe Thunderstorm Watch	SPC	Butte, Custer, Fall River, Haakon, Harding, Lawrence and 4 more	5 hr
Jun 18, 1:19 AM CDT	Mesoscale Discussion	SPC	Butte, Corson, Custer, Dewey, Haakon, Lawrence and 4 more	56 min
Jun 18, 4:45 AM CDT	Mesoscale Discussion	SPC	Campbell, Corson, Dewey, Haakon, Hughes, Hyde and 10 more	90 min
Jun 18, 1:13 PM CDT	Mesoscale Discussion	SPC	Beadle, Brown, Campbell, Corson, Dewey, Edmunds and 10 more	92 min
Jun 18, 1:28 PM CDT	Tornado Watch	SPC	Buffalo, Campbell, Corson, Dewey, Edmunds, Faulk and 13 more	9 hr
Jun 18, 5:23 PM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Edmunds, McPherson, Marshall, Walworth	97 min

Nearby

Mesoscale Discussions in South Dakota, 2014 Mesoscale Discussions in Iowa, 2014 Mesoscale Discussions in Nebraska, 2014 Every mesoscale discussion in 2014

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.