Alert archive / South Dakota / Mesoscale Discussions in 2015

Mesoscale Discussion 1535

July 25, 201520 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2015, 5:58 PM CDT for 20 counties in South Dakota. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2015, 5:58 PM CDT (22:58 UTC)
Expired: Jul 25, 2015, 7:30 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

Counties Beadle County, SD, Brown County, SD, Buffalo County, SD, Campbell County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Potter County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 136 km from the middle of the area, began a volume at 23:00 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, 11.0 hours before the alert went out and 110 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: 272 J/kg
Mixed-layer CIN: -256 J/kg
Mixed-layer LCL: 2141 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 25, 7:47 AM CDT	Mesoscale Discussion	SPC	Brule, Gregory, Jones, Lyman, Mellette, Tripp	2 hr
Jul 25, 10:58 AM CDT	Mesoscale Discussion	SPC	Hanson, Hutchinson, Lake, McCook, Miner, Minnehaha and 1 more	92 min
Jul 25, 3:27 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Hand, Hughes and 8 more	2 hr
Jul 25, 4:03 PM CDT	Tornado Watch	SPC	Aurora, Beadle, Brookings, Brown, Brule, Buffalo and 33 more	7 hr
Jul 25, 5:22 PM CDT	Mesoscale Discussion	SPC	Bennett, Jackson, Oglala Lakota	2 hr
Jul 25, 6:13 PM CDT	Mesoscale Discussion	SPC	Brookings, Deuel, Douglas, Grant, Hamlin, Hanson and 8 more	3 hr

Nearby

Mesoscale Discussions in South Dakota, 2015 Every mesoscale discussion in 2015

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.