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000 

WWUS20 KWNS 110103

SEL6

SPC WW 110103

SDZ000-110600-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 506

NWS STORM PREDICTION CENTER NORMAN OK

805 PM CDT TUE JUN 10 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND WESTERN SOUTH DAKOTA



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 805 PM

UNTIL 100 AM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST NORTHWEST OF

RAPID CITY SOUTH DAKOTA TO 50 MILES SOUTHEAST OF PIERRE SOUTH

DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 500...WW 501...WW

502...WW 503...WW 504...WW 505...



DISCUSSION...SEVERE THUNDERSTORMS DEVELOPING OVER AND W OF BLACK

HILLS IN ADVANCE OF COLD FRONT AND STRONG UPPER TROUGH.  E/W

BOUNDARY EXTENDING EWD ACROSS CENTRAL SD WILL ENHANCE VERY FAVORABLE

SHEAR PROFILES SUPPORTING SUPERCELLS.  LARGE HAIL AND POSSIBLE

TORNADOES WILL BE ASSOCIATED WITH ANY SUPERCELL AS STORMS MOVE EWD

ACROSS THE WATCH AREA.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 27030.





...HALES

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