Alert archive / South Dakota / Mesoscale Discussions in 2016

Mesoscale Discussion 1499

August 8, 2016Cherry County, Nebraska; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2016, 6:56 PM MDT for Cherry County, Nebraska; 10 counties in South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Aug 8, 2016, 6:56 PM MDT (00:56 UTC)
Expired: Aug 8, 2016, 8:30 PM MDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Cherry County, NE, Bennett County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Tripp County, SD

The radar

The Rapid City radar (KUDX), 95 km from the middle of the area, began a volume at 00:58 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 00:00Z, 0.9 hours before the alert went out and 94 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: 682 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1879 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 9, 3:51 PM MDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Haakon, Harding, Lawrence and 4 more	114 min
Aug 9, 4:16 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Corson, Custer, Dewey, Fall River and 12 more	7 hr

Nearby

Mesoscale Discussions in South Dakota, 2016 Mesoscale Discussions in Nebraska, 2016 Every mesoscale discussion in 2016

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.