WTPQ31 RJTD 270600
RSMC TROPICAL CYCLONE PROGNOSTIC REASONING
REASONING NO.21 FOR TY 2216 NORU (2216)
1.GENERAL COMMENTS
TY NORU IS LOCATED AT 15.6N, 111.3E. INFORMATION ON THE CURRENT
POSITION IS BASED ON THE EYE IN ANIMATED MSI AND SURFACE
OBSERVATIONS. POSITIONAL ACCURACY IS GOOD. CENTRAL PRESSURE IS
950HPA AND MAXIMUM SUSTAINED WINDS NEAR THE CENTER ARE 85KNOTS.
THE SYSTEM IS IN A NEUTRAL ENVIRONMENT FOR DEVELOPMENT UNDER THE
INFLUENCE OF HIGH SSTS, HIGH TCHP, GOOD UPPER-LEVEL OUTFLOW AND
INCREASED VWS. THIS HAS CAUSED THE SYSTEM TO MAINTAIN ITS
INTENSITY 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 WESTWARD ALONG THE SOUTHERN PERIPHERY OF A
MID-LEVEL SUB-TROPICAL HIGH. ANIMATED MSI SHOWS THE SYSTEM HAS AN
EYE. ANIMATED MSI SHOWS GOOD CLOUD CHARACTERISTICS OF ANTICYCLONIC
OUTFLOW. METOP-C/MHS 85 GHZ MICROWAVE IMAGERY SHOWS THE SYSTEM HAS
A BAND WITH CURVATURE INDICATING THE CSC.
3.TRACK FORECAST
THE SYSTEM WILL MOVE WESTWARD ALONG THE PERIPHERY OF A MID-LEVEL
SUB-TROPICAL HIGH UNTIL FT48. THE SYSTEM WILL HIT VIET-NAM BY
FT24. 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 FT12 DUE TO THE INFLUENCE OF
INTERACTION WITH HIGH SSTS, HIGH TCHP AND GOOD UPPER LEVEL
OUTFLOW. THE SYSTEM WILL THEN WEAKEN RAPIDLY UNTIL FT48 DUE TO ITS
LANDFALL. THE SYSTEM WILL WEAKEN TO TD INTENSITY BY FT48. THE
INTENSITY FORECAST IS BASED ON A CONSENSUS OF GUIDANCE DATA
INCLUDING GSM.
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