Alert archive / South Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 758

May 7, 2005Emmons County, McIntosh County, Sioux County, North Dakota; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 7, 2005, 3:25 PM CDT for Emmons County, McIntosh County, Sioux County, North Dakota; 10 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 7, 2005, 3:25 PM CDT (20:25 UTC)
Expired: May 7, 2005, 5:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Emmons County, ND, McIntosh County, ND, Sioux County, ND, Brown County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, McPherson County, SD, Potter County, SD, Spink County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 71 km from the middle of the area, began a volume at 20:28 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 225May 7, 4:40 PM CDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.4 hours before the alert went out and 92 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: 9 J/kg
Mixed-layer CIN: -258 J/kg
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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
May 7, 4:40 PM CDT	Severe Thunderstorm Watch	SPC	Burleigh, Dickey, Emmons, Kidder, LaMoure, Logan and 5 more	5 hr
May 7, 6:47 PM CDT	Mesoscale Discussion	SPC	Burleigh, Dickey, Emmons, Kidder, LaMoure, Logan and 3 more	118 min
May 6, 8:56 PM CDT	Mesoscale Discussion	SPC	Bennett, Todd	94 min
May 6, 11:36 PM CDT	Mesoscale Discussion	SPC	Lincoln, Minnehaha	54 min
May 7, 12:23 PM CDT	Mesoscale Discussion	SPC	Aurora, Brule, Buffalo, Charles Mix, Douglas, Gregory and 13 more	3 hr
May 7, 1:50 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brule, Buffalo, Charles Mix, Douglas and 9 more	7 hr
May 7, 5:02 PM CDT	Mesoscale Discussion	SPC	Clay, Lincoln, Minnehaha, Turner, Union, Yankton	118 min
May 7, 5:32 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brookings, Brown, Brule and 34 more	118 min

Nearby

Mesoscale Discussions in South Dakota, 2005 Mesoscale Discussions in North Dakota, 2005 Every mesoscale discussion in 2005

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.