Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 1824

August 1, 200413 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2004, 10:00 PM CDT for 13 counties in South Dakota. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Aug 1, 2004, 10:00 PM CDT (03:00 UTC)
Expired: Aug 1, 2004, 11:00 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Beadle County, SD, Buffalo County, SD, Campbell County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Potter County, SD, Spink County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 105 km from the middle of the area, began a volume at 03:00 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, 3.0 hours before the alert went out and 94 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: 3501 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 305 m²/s²
Significant tornado parameter: 3.8
Supercell composite: 15.7

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
Aug 1, 7:22 PM CDT	Mesoscale Discussion	SPC	Beadle, Brookings, Brown, Campbell, Clark, Codington and 17 more	53 min
Aug 1, 7:45 PM CDT	Tornado Watch	SPC	Beadle, Brookings, Brown, Buffalo, Campbell, Clark and 26 more	6 hr
Aug 1, 10:35 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 6 more	5 hr
Aug 1, 11:29 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 19 more	61 min
Aug 2, 12:20 AM CDT	Severe Thunderstorm Watch	SPC	Lake, Lincoln, Minnehaha, Moody, Union	4 hr
Aug 2, 3:02 AM CDT	Mesoscale Discussion	SPC	Bon Homme, Clay, Lincoln, Turner, Union, Yankton	58 min
Aug 2, 3:12 PM CDT	Mesoscale Discussion	SPC	Beadle, Brookings, Clark, Deuel, Hamlin, Jerauld and 7 more	2 hr
Aug 2, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	Brookings, Davison, Hanson, Kingsbury, Lake, McCook and 4 more	5 hr
Aug 2, 4:23 PM CDT	Mesoscale Discussion	SPC	Bon Homme, Charles Mix, Clay, Douglas, Gregory, Hutchinson and 5 more	37 min
Aug 2, 6:30 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 17 more	6 hr

Nearby

Mesoscale Discussions in South Dakota, 2004 Every mesoscale discussion in 2004

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.