WTPQ32 RJTD 150000
RSMC TROPICAL CYCLONE PROGNOSTIC REASONING
REASONING NO.13 FOR TY 2407 AMPIL (2407)
1.GENERAL COMMENTS
  TY AMPIL IS LOCATED AT 29.6N, 141.1E. INFORMATION ON THE CURRENT
  POSITION IS BASED ON THE EYE IN ANIMATED MSI AND SURFACE
  OBSERVATIONS. POSITIONAL ACCURACY IS GOOD. CENTRAL PRESSURE IS
  970HPA AND MAXIMUM SUSTAINED WINDS NEAR THE CENTER ARE 65KNOTS.
  THE SYSTEM IS IN A FAVORABLE ENVIRONMENT FOR DEVELOPMENT UNDER THE
  INFLUENCE OF HIGH SSTS AND WEAK VWS. THIS HAS CAUSED THE SYSTEM TO
  DEVELOP OVER THE LAST SIX HOURS. INFORMATION ON THE CURRENT
  INTENSITY IS BASED ON DVORAK INTENSITY ANALYSES AND SURFACE
  OBSERVATIONS.
2.SYNOPTIC SITUATION
  THE SYSTEM IS MOVING NORTHWARD ALONG THE WESTERN PERIPHERY OF A
  MID-LEVEL SUB-TROPICAL HIGH. ANIMATED MSI SHOWS THE APPEARANCE OF
  AN EYE. GPM/GMI 89 GHZ MICROWAVE IMAGERY SHOWS THE SYSTEM HAS A
  BAND WITH CURVATURE INDICATING THE CSC.
3.TRACK FORECAST
  THE SYSTEM WILL MOVE NORTHWARD ALONG THE PERIPHERY OF A MID-LEVEL
  SUB-TROPICAL HIGH UNTIL FT48. THE SYSTEM WILL THEN GRADUALLY
  ACCELERATE AND MOVE EAST-NORTHEASTWARD UNTIL FT96. THE SYSTEM WILL
  THEN GRADUALLY ACCELERATE AND MOVE NORTHEASTWARD UNTIL FT120. THE
  TRACK FORECAST IS BASED ON GSM PREDICTIONS, AND REFERENCE TO OTHER
  NWP MODELS. TRACK FORECAST CONFIDENCE IS FAIR BECAUSE ALL NWP
  MODELS ARE IN CLOSE AGREEMENT.
4.INTENSITY FORECAST
  THE SYSTEM WILL DEVELOP UNTIL FT24 DUE TO THE INFLUENCE OF
  INTERACTION WITH HIGH SSTS AND WEAK VWS. THE SYSTEM WILL THEN
  WEAKEN UNTIL FT120 DUE TO THE INFLUENCE OF INTERACTION WITH LOWER
  SSTS, REDUCED TCHP AND INCREASED VWS. THE SYSTEM WILL TRANSFORM
  INTO AN EXTRATROPICAL CYCLONE BY FT120. THE INTENSITY FORECAST IS
  BASED ON A CONSENSUS OF GUIDANCE DATA INCLUDING GSM.
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