Alert archive / South Dakota / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 692

August 2, 200423 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 2, 2004, 6:30 PM CDT for 23 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Aug 2, 2004, 6:30 PM CDT (23:30 UTC)
Expired
Aug 3, 2004, 12:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 23 counties

Aurora County, SD, Bennett County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Haakon County, SD, Hanson County, SD, Hutchinson County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, McCook County, SD, Mellette County, SD, Miner County, SD, Sanborn County, SD, Todd County, SD, Tripp County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 203 km from the middle of the area, began a volume at 23:32 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.

Warnings issued inside it

7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 2, 7:18 PM CDTSevere Thunderstorm WarningUNRBennett57 min
Aug 2, 8:08 PM CDTSevere Thunderstorm WarningFSDBrule37 min
Aug 2, 8:11 PM CDTSevere Thunderstorm WarningFSDAurora, Jerauld34 min
Aug 2, 8:38 PM CDTSevere Thunderstorm WarningABRBuffalo, Lyman67 min
Aug 2, 8:45 PM CDTSevere Thunderstorm WarningFSDAurora, Brule45 min
Aug 2, 9:39 PM CDTSevere Thunderstorm WarningFSDAurora, Douglas36 min
Aug 2, 11:34 PM CDTSevere Thunderstorm WarningABRLyman56 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.5 hours before the alert went out and 190 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-pSkew-T log-p diagram, Aberdeen, SD at 12:00Z on 2004-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 173 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 12:00Z on 2004-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
173 J/kg
Mixed-layer CIN
-527 J/kg
Mixed-layer LCL
1406 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
237 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
Aug 1, 7:22 PM CDTMesoscale DiscussionSPCBeadle, Brookings, Brown, Campbell, Clark, Codington and 17 more53 min
Aug 1, 7:45 PM CDTTornado WatchSPCBeadle, Brookings, Brown, Buffalo, Campbell, Clark and 26 more6 hr
Aug 1, 10:00 PM CDTMesoscale DiscussionSPCBeadle, Buffalo, Campbell, Edmunds, Faulk, Hand and 7 more60 min
Aug 1, 10:35 PM CDTSevere Thunderstorm WatchSPCAurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 6 more5 hr
Aug 1, 11:29 PM CDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 19 more61 min
Aug 2, 12:20 AM CDTSevere Thunderstorm WatchSPCLake, Lincoln, Minnehaha, Moody, Union4 hr
Aug 2, 3:02 AM CDTMesoscale DiscussionSPCBon Homme, Clay, Lincoln, Turner, Union, Yankton58 min
Aug 2, 3:12 PM CDTMesoscale DiscussionSPCBeadle, Brookings, Clark, Deuel, Hamlin, Jerauld and 7 more2 hr
Aug 2, 3:50 PM CDTSevere Thunderstorm WatchSPCBrookings, Davison, Hanson, Kingsbury, Lake, McCook and 4 more5 hr
Aug 2, 4:23 PM CDTMesoscale DiscussionSPCBon Homme, Charles Mix, Clay, Douglas, Gregory, Hutchinson and 5 more37 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2004Every severe thunderstorm watch 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.