Alert archive / South Dakota / Mesoscale Discussions in 2015

Mesoscale Discussion 1079

June 19, 201510 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2015, 10:31 PM CDT for 10 counties in South Dakota. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2015, 10:31 PM CDT (03:31 UTC)
Expired: Jun 19, 2015, 11:30 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

Counties Aurora County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Douglas County, SD, Haakon County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Tripp County, SD

The radar

The Rapid City radar (KUDX), 185 km from the middle of the area, began a volume at 03:31 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 315Jun 19, 10:55 PM CDT

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 3.5 hours before the alert went out and 189 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: 1998 J/kg
Mixed-layer CIN: -196 J/kg
Mixed-layer LCL: 1644 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 19, 7:38 PM CDT	Mesoscale Discussion	SPC	Butte, Haakon, Harding, Jackson, Lawrence, Meade and 3 more	67 min
Jun 19, 9:29 PM CDT	Mesoscale Discussion	SPC	McPherson, Marshall	61 min
Jun 19, 10:57 PM CDT	Severe Thunderstorm Watch PDS	SPC	Aurora, Beadle, Bennett, Bon Homme, Brookings, Brule and 34 more	5 hr
Jun 20, 1:02 AM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Charles Mix, Davison and 18 more	58 min
Jun 20, 3:50 PM CDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Haakon, Harding, Lawrence and 5 more	115 min

Nearby

Mesoscale Discussions in South Dakota, 2015 Every mesoscale discussion in 2015

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.