Alert archive / South Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1087

June 19, 201414 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2014, 1:37 PM MDT for 14 counties in South Dakota. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2014, 1:37 PM MDT (19:37 UTC)
Expired: Jun 19, 2014, 2:30 PM MDT
In force: 53 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Butte County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Jones County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 111 km from the middle of the area, began a volume at 19:37 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 (KRAP), launched 12:00Z, 7.6 hours before the alert went out and 118 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: 266 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 979 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 18, 6:37 PM MDT	Tornado Watch	SPC	Brown, Clark, Codington, Day, Deuel, Grant and 4 more	6 hr
Jun 18, 7:47 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brookings, Brown, Clark, Clay and 27 more	88 min
Jun 19, 12:15 AM MDT	Mesoscale Discussion	SPC	Clay, Lincoln, Minnehaha, Turner, Union, Yankton	90 min
Jun 19, 12:31 AM MDT	Severe Thunderstorm Watch	SPC	Clay, Lincoln, Minnehaha, Moody, Turner, Union and 1 more	3 hr
Jun 19, 2:15 AM MDT	Mesoscale Discussion	SPC	Clay, Lincoln, McCook, Minnehaha, Moody, Turner and 2 more	90 min

Nearby

Mesoscale Discussions in South Dakota, 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.