Alert archive / South Dakota / Mesoscale Discussions in 2016

Mesoscale Discussion 1504

August 9, 2016Adams County, Bowman County, Sioux County, North Dakota; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2016, 6:30 PM MDT for Adams County, Bowman County, Sioux County, North Dakota; 9 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 9, 2016, 6:30 PM MDT (00:30 UTC)
Expired: Aug 9, 2016, 8:30 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Adams County, ND, Bowman County, ND, Sioux County, ND, Butte County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Harding County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 105 km from the middle of the area, began a volume at 00:30 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

Rapid City, SD (KUNR), launched 00:00Z, 0.5 hours before the alert went out and 112 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: 2188 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 2056 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.6

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 9, 8:51 PM MDT	Mesoscale Discussion	SPC	Adams, Dickey, Emmons, Grant, LaMoure, Logan and 4 more	114 min
Aug 9, 9:19 PM MDT	Severe Thunderstorm Watch	SPC	Barnes, Cass, Dickey, Emmons, Kidder, LaMoure and 6 more	8 hr
Aug 10, 12:05 AM MDT	Mesoscale Discussion	SPC	Dickey	55 min
Aug 10, 10:19 AM MDT	Mesoscale Discussion	SPC	Cass, Dickey, LaMoure, McIntosh, Ransom, Richland and 1 more	2 hr
Aug 10, 12:15 PM MDT	Severe Thunderstorm Watch	SPC	Cass, Dickey, Ransom, Richland, Sargent	7 hr
Aug 10, 2:45 PM MDT	Mesoscale Discussion	SPC	Cass, Dickey, LaMoure, McIntosh, Ransom, Richland and 1 more	2 hr
Aug 10, 2:53 PM MDT	Mesoscale Discussion	SPC	Billings, Divide, Golden Valley, McKenzie, Williams	97 min
Aug 10, 4:59 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Benson, Billings, Bottineau, Burke, Burleigh and 31 more	7 hr
Aug 10, 2:49 PM MDT	Mesoscale Discussion	SPC	Bennett, Dewey, Haakon, Hughes, Jackson, Jones and 7 more	56 min
Aug 10, 4:18 PM MDT	Mesoscale Discussion	SPC	Bennett, Butte, Custer, Fall River, Harding, Jackson and 5 more	57 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.