Alert archive / South Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 1005

July 4, 2018Big Stone County, Traverse County, Minnesota; 20 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2018, 3:14 AM CDT for Big Stone County, Traverse County, Minnesota; 20 counties in South Dakota. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jul 4, 2018, 3:14 AM CDT (08:14 UTC)
Expired: Jul 4, 2018, 4:45 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center

All 22 counties

Big Stone County, MN, Traverse County, MN, Beadle County, SD, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Kingsbury County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 81 km from the middle of the area, began a volume at 08:15 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, 8.2 hours before the alert went out and 45 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: 3627 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.1

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
Jul 4, 12:49 AM CDT	Mesoscale Discussion	SPC	Clay, Marshall, Norman, Pennington, Polk, Red Lake and 1 more	116 min
Jul 4, 1:34 AM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 11 more	7 hr
Jul 4, 7:10 AM CDT	Mesoscale Discussion	SPC	Aitkin, Carlton, Cass, Crow Wing, Itasca, Koochiching and 1 more	95 min
Jul 4, 9:56 AM CDT	Mesoscale Discussion	SPC	Cook, Dodge, Fillmore, Houston, Lake, Mower and 3 more	2 hr
Jul 4, 10:27 AM CDT	Mesoscale Discussion	SPC	Freeborn, Mower	2 hr
Jul 3, 9:38 PM CDT	Mesoscale Discussion	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 7 more	2 hr
Jul 3, 10:38 PM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Clark, Corson, Day, Dewey and 14 more	97 min
Jul 3, 11:02 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Campbell, Clark, Corson, Day, Dewey and 13 more	6 hr
Jul 4, 2:01 PM CDT	Mesoscale Discussion	SPC	Bon Homme, Charles Mix, Clay, Gregory, Union, Yankton	119 min
Jul 4, 5:35 PM CDT	Mesoscale Discussion	SPC	Bon Homme, Clay, Union, Yankton	115 min

Nearby

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