Alert archive / South Dakota / Mesoscale Discussions in 2020

Mesoscale Discussion 290

April 6, 20204 counties in Minnesota; 4 counties in North Dakota; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2020, 7:53 PM CDT for 4 counties in Minnesota; 4 counties in North Dakota; 9 counties in South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 6, 2020, 7:53 PM CDT (00:53 UTC)
Expired: Apr 6, 2020, 10:30 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Big Stone County, MN, Grant County, MN, Traverse County, MN, Wilkin County, MN, Dickey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Brown County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Marshall County, SD, McPherson County, SD, Roberts County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 43 km from the middle of the area, began a volume at 00:53 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, 0.9 hours before the alert went out and 86 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: 258 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 1487 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

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
Apr 7, 1:56 AM CDT	Mesoscale Discussion	SPC	Benton, Crow Wing, Douglas, Grant, Mille Lacs, Morrison and 5 more	3 hr

Nearby

Mesoscale Discussions in South Dakota, 2020 Mesoscale Discussions in Minnesota, 2020 Mesoscale Discussions in North 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.