Alert archive / South Dakota / Mesoscale Discussions in 2003

Mesoscale Discussion 1636

July 5, 200325 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2003, 7:23 PM CDT for 25 counties in South Dakota. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jul 5, 2003, 7:23 PM CDT (00:23 UTC)
Expired: Jul 5, 2003, 9:00 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 25 counties

Aurora County, SD, Beadle County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Corson County, SD, Davison County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Lyman County, SD, McPherson County, SD, Miner County, SD, Potter County, SD, Sanborn County, SD, Spink County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 133 km from the middle of the area, began a volume at 00:26 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, 0.4 hours before the alert went out and 99 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: 797 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 2253 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

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 5, 7:20 PM CDT	Tornado Watch	SPC	Bon Homme, Charles Mix, Clay, Douglas, Gregory, Hutchinson and 7 more	6 hr
Jul 5, 8:04 PM CDT	Mesoscale Discussion	SPC	Brookings, Clark, Codington, Deuel, Grant, Hamlin and 3 more	86 min
Jul 6, 4:56 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brookings, Brule, Buffalo, Charles Mix and 25 more	2 hr

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.