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 155 
 WTNT44 KNHC 051445
 TCDAT4
 TROPICAL STORM GRACE DISCUSSION NUMBER   3
 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   AL092009
 1100 AM AST MON OCT 05 2009
  
 THE CONVECTIVE STRUCTURE OF GRACE HAS BEGUN TO DETERIORATE
 SLIGHTLY...WITH THE RING OF DEEP CONVECTION AROUND THE CENTER
 BECOMING LESS SYMMETRIC AND FRACTURED.  THE INITIAL INTENSITY IS
 LOWERED TO 55 KT ON THIS ADVISORY BASED ON TROPICAL AND SUBTROPICAL
 CLASSIFICATIONS OF 3.5...AND A 0644 UTC QUIKSCAT PASS WHICH
 SUPPORTED MAXIMUM WINDS BETWEEN 50 AND 55 KT.  ALSO...GRACE IS NOW
 OVER WATER NEAR 18C...AND THIS IS LIKELY INHIBITING STRONG
 CONVECTIVE MIXING OF WINDS TO THE SURFACE.  SOME ADDITIONAL
 WEAKENING IS ANTICIPATED OVER THE NEXT 24 HOURS...AND THE GLOBAL
 MODELS ALL INDICATE THAT GRACE SHOULD BE ABSORBED BY A FRONT JUST
 SOUTHWEST OF IRELAND BY TUESDAY MORNING.
  
 GRACE IS ACCELERATING WITH AN INITIAL MOTION OF 30 DEGREES AT 27 KT.
 THE CYCLONE IS EXPECTED TO TURN TOWARD THE NORTH-NORTHEAST AND SLOW
 DOWN OVER THE NEXT 12 TO 24 HOURS AS IT MOVES NORTH OF THE STRONGEST
 BELT OF MID-LATITUDE WESTERLIES...AND BECOMES ABSORBED BY THE
 FRONTAL BOUNDARY TO ITS NORTHWEST.
  
 DESPITE THE FACT THAT GRACE IS MOVING OVER VERY COLD WATERS...AN
 AMSU PASS FROM EARLIER TODAY STILL SHOWS THE PRESENCE OF A MODERATE
 TO DEEP WARM CORE IN ASSOCIATION WITH THE CYCLONE.  IN ADDITION...
 THE WIND RADII HAVE BEEN ADJUSTED BASED ON THE 0644 UTC QUIKSCAT
 PASS.
 
 FORECAST POSITIONS AND MAX WINDS
  
 INITIAL      05/1500Z 45.4N  16.4W    55 KT
  12HR VT     06/0000Z 48.0N  14.6W    50 KT
  24HR VT     06/1200Z...ABSORBED BY A FRONT
  
 $$
 FORECASTER BERG
  
 
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