Alert archive / South Dakota / Mesoscale Discussions in 2020

Mesoscale Discussion 932

June 17, 202010 counties in Nebraska; 21 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2020, 10:16 PM MDT for 10 counties in Nebraska; 21 counties in South Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2020, 10:16 PM MDT (04:16 UTC)
Expired: Jun 17, 2020, 11:45 PM MDT
In force: 89 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 283

All 31 counties

Arthur County, NE, Blaine County, NE, Brown County, NE, Cherry County, NE, Grant County, NE, Hooker County, NE, Keya Paha County, NE, Logan County, NE, McPherson County, NE, Thomas County, NE, Aurora County, SD, Beadle County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Clark County, SD, Day County, SD, Faulk County, SD, Gregory County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, Marshall County, SD, Mellette County, SD, Spink County, SD, Sully County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 189 km from the middle of the area, began a volume at 04:18 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

Aberdeen, SD (KABR), launched 00:00Z, 4.3 hours before the alert went out and 192 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: 2164 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1903 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 48 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 17, 8:23 PM MDT	Mesoscale Discussion	SPC	Arthur, Brown, Cherry, Grant, Hooker, Keya Paha and 1 more	2 hr
Jun 18, 2:48 PM MDT	Mesoscale Discussion	SPC	Burt, Butler, Cass, Dodge, Douglas, Fillmore and 15 more	117 min
Jun 18, 5:30 PM MDT	Mesoscale Discussion	SPC	Cass, Douglas, Gage, Jefferson, Johnson, Nemaha and 4 more	2 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.