Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1229

June 21, 20079 counties in North Dakota; 16 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2007, 4:34 AM MDT for 9 counties in North Dakota; 16 counties in South Dakota. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2007, 4:34 AM MDT (10:34 UTC)
Expired: Jun 21, 2007, 6:00 AM MDT
In force: 86 min
Issued by: the Storm Prediction Center

All 25 counties

Adams County, ND, Dickey County, ND, Emmons County, ND, Grant County, ND, Hettinger County, ND, McIntosh County, ND, Sargent County, ND, Sioux County, ND, Stark County, ND, Brown County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Day County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Marshall County, SD, McPherson County, SD, Perkins County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 120 km from the middle of the area, began a volume at 10:34 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, 10.6 hours before the alert went out and 178 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: 833 J/kg
Mixed-layer CIN: -248 J/kg
Mixed-layer LCL: 1832 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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 21, 1:10 AM MDT	Mesoscale Discussion	SPC	Adams, Dickey, Emmons, Grant, LaMoure, Logan and 3 more	95 min
Jun 21, 1:29 AM MDT	Severe Thunderstorm Watch	SPC	Adams, Bowman, Burleigh, Dickey, Emmons, Grant and 13 more	8 hr
Jun 21, 1:43 PM MDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Golden Valley, Grant, Hettinger and 3 more	92 min
Jun 21, 2:55 AM MDT	Mesoscale Discussion	SPC	Codington, Deuel, Grant, Roberts	95 min
Jun 21, 6:14 AM MDT	Mesoscale Discussion	SPC	Brookings, Brown, Campbell, Clark, Codington, Day and 11 more	91 min
Jun 21, 8:10 AM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 19 more	35 min
Jun 21, 8:38 AM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more	6 hr
Jun 21, 1:13 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 22 more	62 min
Jun 21, 2:15 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 19 more	30 min
Jun 21, 3:37 PM MDT	Tornado Watch	SPC	Bennett, Butte, Custer, Dewey, Fall River, Haakon and 12 more	7 hr

Nearby

Mesoscale Discussions in South Dakota, 2007 Mesoscale Discussions in North Dakota, 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.