Alert archive / South Dakota / Mesoscale Discussions in 2020

Mesoscale Discussion 878

June 7, 2020Cherry County, Sheridan County, Nebraska; 21 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 7, 2020, 8:18 PM MDT for Cherry County, Sheridan County, Nebraska; 21 counties in South Dakota. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jun 7, 2020, 8:18 PM MDT (02:18 UTC)
Expired: Jun 7, 2020, 9:15 PM MDT
In force: 57 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 268

All 23 counties

Cherry County, NE, Sheridan County, NE, Bennett County, SD, Brown County, SD, Buffalo County, SD, Campbell County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Marshall County, SD, McPherson County, SD, Mellette County, SD, Potter County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD

The radar

The North Platte radar (KLNX), 183 km from the middle of the area, began a volume at 02:21 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 (KUNR), launched 00:00Z, 2.3 hours before the alert went out and 186 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: 50 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 2941 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 228 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

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, 2:16 PM MDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boyd, Brown, Custer, Garfield and 14 more	2 hr
Jun 8, 4:56 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Boyd, Brown, Chase, Cherry and 19 more	9 hr

Nearby

Mesoscale Discussions in South Dakota, 2020 Mesoscale Discussions in Nebraska, 2020 Every mesoscale discussion in 2020

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.