Alert archive / South Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 1361

August 26, 20185 counties in Minnesota; Richland County, Sargent County, North Dakota; 15 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2018, 1:42 PM CDT for 5 counties in Minnesota; Richland County, Sargent County, North Dakota; 15 counties in South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 26, 2018, 1:42 PM CDT (18:42 UTC)
Expired: Aug 26, 2018, 4:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 22 counties

Big Stone County, MN, Grant County, MN, Lac qui Parle County, MN, Stevens County, MN, Traverse County, MN, Richland County, ND, Sargent County, ND, Beadle County, SD, Brookings County, SD, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Marshall County, SD, Miner County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 79 km from the middle of the area, began a volume at 18:43 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 12:00Z, 6.7 hours before the alert went out and 87 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: 170 J/kg
Mixed-layer CIN: -494 J/kg
Mixed-layer LCL: 1682 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 249 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
Aug 25, 10:08 PM CDT	Mesoscale Discussion	SPC	Becker, Clay, Douglas, Mahnomen, Norman, Otter Tail and 2 more	97 min
Aug 26, 2:46 AM CDT	Mesoscale Discussion	SPC	Becker, Benton, Clay, Crow Wing, Douglas, Kanabec and 6 more	2 hr
Aug 26, 9:53 AM CDT	Mesoscale Discussion	SPC	Jackson, Nobles	2 hr
Aug 26, 11:56 AM CDT	Mesoscale Discussion	SPC	Becker, Cass, Clay, Crow Wing, Douglas, Grant and 6 more	109 min
Aug 26, 5:14 PM CDT	Mesoscale Discussion	SPC	Aitkin, Carlton, Cass, Crow Wing	2 hr
Aug 26, 6:15 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Grant, Hubbard and 10 more	3 hr
Aug 26, 5:42 AM CDT	Mesoscale Discussion	SPC	Dickey, Emmons, LaMoure, Logan, McIntosh, Sioux	3 hr
Aug 26, 3:52 PM CDT	Mesoscale Discussion	SPC	Burke, Divide, McKenzie, Mountrail, Renville, Ward and 1 more	113 min

Nearby

Mesoscale Discussions in South Dakota, 2018 Mesoscale Discussions in Minnesota, 2018 Mesoscale Discussions in North Dakota, 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.