Alert archive / South Dakota / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 596

July 10, 200416 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 10, 2004, 11:25 AM MDT for 16 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 10, 2004, 11:25 AM MDT (17:25 UTC)
Expired
Jul 10, 2004, 6:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center

Counties Bennett County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 76 km from the middle of the area, began a volume at 17:26 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 10, 2:16 PM MDTSevere Thunderstorm WarningABRStanley29 min
Jul 10, 2:20 PM MDTSevere Thunderstorm WarningUNRJackson40 min
Jul 10, 2:49 PM MDTSevere Thunderstorm WarningABRJones41 min
Jul 10, 3:31 PM MDTSevere Thunderstorm WarningABRJones29 min
Jul 10, 3:55 PM MDTSevere Thunderstorm WarningABRLyman, Stanley35 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

Rapid City, SD (KUNR), launched 12:00Z, 5.4 hours before the alert went out and 80 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, Rapid City, SD at 12:00Z on 2004-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Rapid City, SD at 12:00Z on 2004-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2410 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
3 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 101729
SEL6  
SPC WW 101725
SDZ000-110000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 596
NWS STORM PREDICTION CENTER NORMAN OK
1225 PM CDT SAT JUL 10 2004

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

       WESTERN AND CENTRAL SOUTH DAKOTA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL
700 PM CDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
EAST AND WEST OF A LINE FROM 60 MILES WEST NORTHWEST OF MOBRIDGE
SOUTH DAKOTA TO 70 MILES SOUTH OF PHILIP SOUTH DAKOTA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

DISCUSSION...HIGH BASED CONVECTION HAS DEVELOPED ACROSS WRN SD
WITHIN AREA OF LARGE SCALE ASCENT...LOCATED AHEAD OF SHORTWAVE
TROUGH MOVING EWD FROM MT. STORMS SHOULD INTENSIFY THIS AFTERNOON AS
THEY SPREAD EWD INTO A MORE UNSTABLE/STRONGLY HEATED AIR MASS. DEEP
MIXED BOUNDARY LAYER WILL SUPPORT SEVERE WIND GUSTS...BUT HAIL IS
ALSO EXPECTED GIVEN THE STEEP MID LEVEL LAPSE RATES.

AVIATION...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 500. MEAN STORM
MOTION VECTOR 24020.


...IMY

455,1000 430,1000 430,1030 455,1030

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 9, 6:29 PM MDTMesoscale DiscussionSPCButte, Corson, Dewey, Haakon, Harding, Meade and 3 more2 hr
Jul 10, 11:02 AM MDTMesoscale DiscussionSPCBennett, Corson, Dewey, Haakon, Jackson, Oglala Lakota and 6 more118 min
Jul 10, 2:35 PM MDTMesoscale DiscussionSPCAurora, Beadle, Brookings, Brown, Brule, Buffalo and 26 more85 min
Jul 10, 2:39 PM MDTMesoscale DiscussionSPCHarding2 hr
Jul 10, 2:56 PM MDTMesoscale DiscussionSPCHarding2 hr
Jul 10, 4:10 PM MDTMesoscale DiscussionSPCAurora, Beadle, Brown, Brule, Buffalo, Clark and 18 more2 hr
Jul 10, 4:25 PM MDTSevere Thunderstorm WatchSPCAurora, Beadle, Brookings, Brown, Brule, Buffalo and 30 more7 hr

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.