Alert archive / South Dakota / Mesoscale Discussions in 2003

Mesoscale Discussion 1703

July 8, 200334 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2003, 10:44 AM CDT for 34 counties in South Dakota. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jul 8, 2003, 10:44 AM CDT (15:44 UTC)
Expired: Jul 8, 2003, 12:15 PM CDT
In force: 91 min
Issued by: the Storm Prediction Center

All 34 counties

Aurora County, SD, Beadle County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Davison County, SD, Day County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lake County, SD, Lyman County, SD, McCook County, SD, McPherson County, SD, Miner County, SD, Potter County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 99 km from the middle of the area, began a volume at 15:48 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 12:00Z, 3.7 hours before the alert went out and 288 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: 94 J/kg
Mixed-layer CIN: -475 J/kg
Mixed-layer LCL: 1190 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Jul 7, 10:15 PM CDT	Mesoscale Discussion	SPC	Bon Homme, Clay, Union	3 hr
Jul 7, 10:20 PM CDT	Severe Thunderstorm Watch	SPC	Bon Homme, Clay, Union	7 hr
Jul 7, 11:25 PM CDT	Mesoscale Discussion	SPC	Aurora, Bon Homme, Brule, Charles Mix, Davison, Douglas and 8 more	2 hr
Jul 7, 11:40 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 18 more	5 hr
Jul 8, 1:34 AM CDT	Mesoscale Discussion	SPC	Union	116 min
Jul 8, 2:52 AM CDT	Mesoscale Discussion	SPC	Aurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 13 more	113 min
Jul 8, 2:36 PM CDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Lawrence, Pennington	84 min
Jul 8, 3:05 PM CDT	Tornado Watch	SPC	Bennett, Butte, Custer, Fall River, Harding, Jackson and 5 more	7 hr
Jul 8, 5:38 PM CDT	Mesoscale Discussion	SPC	Bennett, Butte, Custer, Fall River, Harding, Lawrence and 4 more	67 min

Nearby

Mesoscale Discussions in South Dakota, 2003 Every mesoscale discussion in 2003

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.