Alert archive / South Dakota / Mesoscale Discussions in 2016

Mesoscale Discussion 1357

July 22, 2016Dickey County, McIntosh County, Sargent County, North Dakota; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2016, 12:28 PM CDT for Dickey County, McIntosh County, Sargent County, North Dakota; 6 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 22, 2016, 12:28 PM CDT (17:28 UTC)
Expired: Jul 22, 2016, 2:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Dickey County, ND, McIntosh County, ND, Sargent County, ND, Brown County, SD, Campbell County, SD, Day County, SD, Edmunds County, SD, Marshall County, SD, McPherson County, SD

The radar

The Aberdeen radar (KABR), 35 km from the middle of the area, began a volume at 17:31 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 409Jul 22, 2:10 PM CDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 5.5 hours before the alert went out and 96 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: 2435 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 963 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 22, 2:17 PM CDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Burleigh, Dunn, Eddy and 20 more	2 hr
Jul 22, 4:06 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Billings, Bowman, Burleigh, Dunn, Emmons and 21 more	9 hr
Jul 22, 6:35 PM CDT	Mesoscale Discussion	SPC	Adams, Emmons, Grant, Hettinger, Logan, McIntosh and 2 more	55 min
Jul 22, 2:16 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brookings, Brown, Buffalo, Clark and 23 more	8 hr
Jul 22, 2:45 PM CDT	Mesoscale Discussion	SPC	Custer, Fall River	60 min
Jul 22, 3:41 PM CDT	Mesoscale Discussion	SPC	Beadle, Brookings, Buffalo, Clark, Codington, Day and 16 more	94 min

Nearby

Mesoscale Discussions in South Dakota, 2016 Mesoscale Discussions in North Dakota, 2016 Every mesoscale discussion in 2016

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.