Alert archive / South Dakota / Tornado Watches in 2004

Tornado Watch 427

June 10, 200417 counties in South Dakota

The Storm Prediction Center issued this tornado watch at Jun 10, 2004, 4:05 PM CDT for 17 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 10, 2004, 4:05 PM CDT (21:05 UTC)
Expired: Jun 10, 2004, 9:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

Counties Brule County, SD, Buffalo County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Gregory County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 152 km from the middle of the area, began a volume at 21:08 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

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

Issued	Product	Office	Counties	Lasted
Jun 10, 5:26 PM CDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley	64 min
Jun 10, 5:55 PM CDT	Tornado Warning	ABR	Stanley	35 min
Jun 10, 6:26 PM CDT	Tornado Warning	ABR	Stanley	34 min
Jun 10, 6:57 PM CDT	Tornado Warning	ABR	Stanley	33 min
Jun 10, 7:10 PM CDT	Flash Flood Warning	ABR	Stanley	6 hr
Jun 10, 7:19 PM CDT	Severe Thunderstorm Warning	ABR	Sully	26 min
Jun 10, 7:34 PM CDT	Tornado Warning	ABR	Sully	26 min
Jun 10, 7:59 PM CDT	Severe Thunderstorm Warning	ABR	Sully	46 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, 9.1 hours before the alert went out and 132 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 487 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 105 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.

000
WWUS20 KWNS 102105
SEL7  
SPC WW 102105
SDZ000-110200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 427
NWS STORM PREDICTION CENTER NORMAN OK
405 PM CDT THU JUN 10 2004

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       CENTRAL SOUTH DAKOTA

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 405 PM UNTIL
900 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES EAST AND WEST
OF A LINE FROM 60 MILES SOUTH SOUTHWEST OF CHAMBERLAIN SOUTH
DAKOTA TO 30 MILES NORTH NORTHWEST OF MOBRIDGE SOUTH DAKOTA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 424...WW 425...WW 426...

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO CONTINUE DEVELOPING EWD
ACROSS SD IN RESPONSE TO STRONG DYNAMIC FORCING ASSOCIATED WITH
VIGOROUS UPPER LEVEL VORTICITY MAX LIFTING ACROSS NRN HIGH PLAINS. 
AIR MASS IS UNSTABLE WITH MLCAPE TO 1500 J/KG. SUFFICIENT DEEP LAYER
SHEAR AND LOW LEVEL HELICITY INDICATE POTENTIAL FOR TORNADIC
SUPERCELLS TO FORM...ESPECIALLY GIVEN THE SELY LOW LEVEL WINDS
ALONG/NORTH OF THE WARM FRONT ACROSS SRN SD.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 21035.


...WEISS

425,1005 455,1015 455,0992 425,0983

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 10, 1:14 PM CDT	Mesoscale Discussion	SPC	Bennett, Butte, Custer, Fall River, Haakon, Jackson and 8 more	91 min
Jun 10, 2:00 PM CDT	Tornado Watch	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 7 more	7 hr
Jun 10, 4:59 PM CDT	Mesoscale Discussion	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 7 more	91 min
Jun 10, 6:50 PM CDT	Mesoscale Discussion	SPC	Brule, Buffalo, Campbell, Corson, Dewey, Gregory and 11 more	85 min

Nearby

Tornado Watches in South Dakota, 2004 Every tornado 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.