SEVERE THUNDERSTORM WATCH NUMBER 366

   SEL6          URGENT - IMMEDIATE BROADCAST REQUESTED     SEVERE THUNDERSTORM WATCH NUMBER 366     NWS STORM PREDICTION CENTER NORMAN OK     925 PM MDT SAT JUN 9 2012          THE NWS STORM PREDICTION CENTER HAS ISSUED A     SEVERE THUNDERSTORM WATCH FOR PORTIONS OF                  SOUTHWEST AND CENTRAL SOUTH DAKOTA          EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 925 PM     UNTIL 400 AM MDT.          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 APPROXIMATELY ALONG AND 60     STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHWEST OF     ABERDEEN SOUTH DAKOTA TO 75 MILES SOUTH SOUTHWEST OF PHILIP SOUTH     DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED     WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).          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...STORMS WILL CONTINUE TO INCREASE IN COVERAGE/INTENSITY     THE NEXT FEW HOURS AS A BAND OF LOW-MIDLEVEL FRONTOGENESIS INTERACTS     WITH THE RICHER MOISTURE/INSTABILITY ACROSS CENTRAL SD.  DEEP-LAYER     VERTICAL SHEAR WILL BE FAVORABLE FOR BOTH SUPERCELLS AND ORGANIZED     BOWING SEGMENTS...WITH AN ATTENDANT RISK FOR LARGE HAIL AND DAMAGING     WINDS THROUGH THE OVERNIGHT HOURS.          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 24030.