Alert archive / South Dakota / Mesoscale Discussions in 2020

Mesoscale Discussion 1045

June 28, 20207 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2020, 8:09 PM CDT for 7 counties in South Dakota. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jun 28, 2020, 8:09 PM CDT (01:09 UTC)
Expired: Jun 28, 2020, 9:15 PM CDT
In force: 66 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 313

Counties Campbell County, SD, Corson County, SD, Dewey County, SD, Perkins County, SD, Potter County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 152 km from the middle of the area, began a volume at 01:08 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 316Jun 28, 8:55 PM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.2 hours before the alert went out and 193 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: 1238 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 2065 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

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 28, 8:55 PM CDT	Severe Thunderstorm Watch	SPC	Campbell, Corson, Dewey, Edmunds, Faulk, Hughes and 6 more	6 hr
Jun 28, 11:16 PM CDT	Mesoscale Discussion	SPC	Campbell, Dewey, Haakon, Jones, Potter, Stanley and 2 more	119 min
Jun 29, 3:44 PM CDT	Mesoscale Discussion	SPC	Butte, Harding, Lawrence	2 hr
Jun 29, 4:56 PM CDT	Tornado Watch	SPC	Butte, Harding, Lawrence, Meade, Perkins	8 hr

Nearby

Mesoscale Discussions in South Dakota, 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.