Alert archive / South Dakota / Mesoscale Discussions in 2016

Mesoscale Discussion 1452

July 30, 20165 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2016, 9:50 PM CDT for 5 counties in South Dakota. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jul 30, 2016, 9:50 PM CDT (02:50 UTC)
Expired: Jul 30, 2016, 10:45 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center

Counties Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Stanley County, SD

The radar

The Rapid City radar (KUDX), 201 km from the middle of the area, began a volume at 02:53 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, 2.8 hours before the alert went out and 172 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: 24 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1948 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 30, 7:28 PM CDT	Mesoscale Discussion	SPC	Gregory, Todd, Tripp	92 min
Jul 30, 7:34 PM CDT	Mesoscale Discussion	SPC	Dewey, Hughes, Hyde, Jones, Lyman, Potter and 3 more	86 min
Jul 30, 7:48 PM CDT	Severe Thunderstorm Watch	SPC	Buffalo, Hughes, Hyde, Jones, Lyman, Potter and 2 more	4 hr
Jul 30, 9:32 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Custer, Fall River, Jackson, Mellette, Oglala Lakota and 3 more	7 hr
Jul 30, 11:03 PM CDT	Mesoscale Discussion	SPC	Bennett, Haakon, Jackson, Jones, Mellette, Oglala Lakota and 2 more	117 min
Jul 31, 12:53 AM CDT	Mesoscale Discussion	SPC	Charles Mix, Gregory, Tripp	97 min
Jul 31, 1:00 PM CDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Lawrence, Meade, Oglala Lakota and 1 more	90 min
Jul 31, 2:27 PM CDT	Mesoscale Discussion	SPC	Corson, Harding, Perkins, Ziebach	2 hr
Jul 31, 3:48 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 7 more	7 hr
Jul 31, 5:42 PM CDT	Mesoscale Discussion	SPC	Bennett, Butte, Corson, Custer, Dewey, Fall River and 11 more	2 hr

Nearby

Mesoscale Discussions in South 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.