MESOSCALE DISCUSSION 1074
   NWS STORM PREDICTION CENTER NORMAN OK
   1101 AM CDT FRI JUN 12 2009
   
   AREAS AFFECTED...NERN AND E-CNTRL OK INTO NWRN AR
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 387...
   
   VALID 121601Z - 121730Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 387
   CONTINUES.
   
   THE THREAT FOR DAMAGING WINDS IS EXPECTED TO INCREASE THROUGH LATE
   MORNING AS BOW ECHO CONTINUES SEWD THROUGH PARTS OF NERN AND E-CNTRL
   OK INTO NWRN AR.  LARGE HAIL AND LOCALLY DAMAGING WINDS WILL ALSO BE
   POSSIBLE WITH SUPERCELLS DEVELOPING DOWNSTREAM FROM MCS. 
   EXTRAPOLATION OF MCS MOTION TAKES IT E OF WW 387 BEFORE 18Z AND A
   PDS SEVERE TSTM WATCH WILL BE ISSUED PRIOR TO 17Z.
   
   AS OF 1540Z...REGIONAL RADAR IMAGERY INDICATED BOW ECHO FROM ROGERS
   AND MAYS COUNTIES SWWD TO CREEK AND LINCOLN COUNTIES IN OK.  THE
   LAST SEVERAL VOLUME SCANS HAVE SHOWN A WELL-DEFINED REAR INFLOW
   NOTCH DEVELOPING OVER NRN TULSA INTO ROGERS COUNTIES.  AN ASSOCIATED
   ACCELERATION HAS OCCURRED WITH THIS PORTION OF THE BOW TO 40-45 KT
   WITH INOLA AND CLAREMORE OK MESONET SITES REPORTING WIND GUSTS TO 85
   AND 61 MPH RESPECTIVELY.  DOWNSTREAM AIR MASS INTO W-CNTRL AR IS
   WARMING INTO THE LOWER 80S WHICH SHOULD ALLOW FOR A MORE EFFICIENT
   TRANSFER OF MOMENTUM INTO THE BOUNDARY LAYER...LIKELY RESULTING IN
   AN INCREASED THREAT OF MORE WIDESPREAD DAMAGING WINDS.
   
   ELSEWHERE...SPLITTING SUPERCELLS WERE OBSERVED OVER HASKELL AND
   MUSKOGEE AND SEQUOYAH COUNTIES INTO ERN OK WITHIN ZONE OF
   STRENGTHENING LOW-LEVEL WAA AHEAD OF BOW ECHO.  WHILE SOME THREAT OF
   A TORNADO WILL EXIST WITH CYCLONIC MEMBER...IT APPEARS THAT LARGE
   HAIL WILL REMAIN THE PRIMARY SEVERE WEATHER THREAT WITH THESE
   STORMS.
   
   ..MEAD.. 06/12/2009
   
   
   ATTN...WFO...LZK...SGF...TSA...ICT...OUN...
   
   LAT...LON   34959628 35539680 35999709 36709675 36969644 37009530
               36519396 35689349 35089397 34709479 34959628