Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1026

June 6, 2007Cherry County, Nebraska; 15 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2007, 2:31 PM MDT for Cherry County, Nebraska; 15 counties in South Dakota. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jun 6, 2007, 2:31 PM MDT (20:31 UTC)
Expired: Jun 6, 2007, 4:30 PM MDT
In force: 119 min
Issued by: the Storm Prediction Center

Counties Cherry County, NE, Bennett County, SD, Buffalo County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 162 km from the middle of the area, began a volume at 20:32 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.

Tornado Watch 353Jun 6, 2:45 PM MDT

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.5 hours before the alert went out and 193 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: 1559 J/kg
Mixed-layer CIN: -237 J/kg
Mixed-layer LCL: 2235 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jun 5, 6:22 PM MDT	Mesoscale Discussion	SPC	Arthur, Box Butte, Chase, Cheyenne, Dawes, Deuel and 11 more	113 min
Jun 6, 12:04 PM MDT	Tornado Watch	SPC	Box Butte, Dawes, Sioux	6 hr
Jun 6, 2:45 PM MDT	Tornado Watch	SPC	Blaine, Brown, Cherry, Garden, Grant, Hooker and 5 more	7 hr
Jun 6, 5:56 PM MDT	Mesoscale Discussion	SPC	Antelope, Arthur, Blaine, Boone, Boyd, Brown and 24 more	2 hr
Jun 5, 10:47 PM MDT	Mesoscale Discussion	SPC	Buffalo, Corson, Dewey, Hughes, Hyde, Jones and 9 more	88 min
Jun 6, 11:36 AM MDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Lawrence	114 min
Jun 6, 5:19 PM MDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Harding, Lawrence, Meade and 3 more	26 min
Jun 6, 5:47 PM MDT	Tornado Watch	SPC	Butte, Harding, Meade, Perkins	7 hr

Nearby

Mesoscale Discussions in South Dakota, 2007 Mesoscale Discussions in Nebraska, 2007 Every mesoscale discussion in 2007

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.