Alert archive / South Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 673

June 8, 2018Cherry County, Keya Paha County, Nebraska; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2018, 4:02 PM MDT for Cherry County, Keya Paha County, Nebraska; 9 counties in South Dakota. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jun 8, 2018, 4:02 PM MDT (22:02 UTC)
Expired: Jun 8, 2018, 5:30 PM MDT
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Cherry County, NE, Keya Paha County, NE, Bennett County, SD, Gregory County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Mellette County, SD, Oglala Lakota County, SD, Todd County, SD, Tripp County, SD

The radar

The Rapid City radar (KUDX), 135 km from the middle of the area, began a volume at 22:06 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 164Jun 8, 4:55 PM MDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.0 hours before the alert went out and 308 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: 778 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: -4 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
Jun 8, 1:01 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Dawes, Garden, Grant and 4 more	119 min
Jun 8, 1:39 PM MDT	Severe Thunderstorm Watch	SPC	Box Butte, Dawes, Sioux	8 hr
Jun 8, 4:55 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Boyd, Brown, Cherry, Garfield, Grant and 8 more	7 hr
Jun 7, 9:04 PM MDT	Mesoscale Discussion	SPC	Harding, Perkins	86 min

Nearby

Mesoscale Discussions in South Dakota, 2018 Mesoscale Discussions in Nebraska, 2018 Every mesoscale discussion in 2018

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.