WTPQ30 RJTD 310600
RSMC TROPICAL CYCLONE PROGNOSTIC REASONING
REASONING NO. 6 FOR TS 2103 CHOI-WAN (2103)
1.GENERAL COMMENTS
TS CHOI-WAN IS LOCATED AT 9.4N, 129.9E. INFORMATION ON THE CURRENT
POSITION IS BASED ON ANIMATED MSI AND SURFACE OBSERVATIONS.
POSITIONAL ACCURACY IS FAIR. CENTRAL PRESSURE IS 1000HPA AND
MAXIMUM SUSTAINED WINDS NEAR THE CENTER ARE 35KNOTS. THE SYSTEM IS
IN A FAVORABLE ENVIRONMENT FOR DEVELOPMENT UNDER THE INFLUENCE OF
HIGH SSTS AND HIGH TCHP. HOWEVER, THE LIMITED FIRMNESS OF ITS
STRUCTURE HAS CAUSED IT TO MAINTAIN ITS INTENSITY OVER THE LAST
SIX HOURS. INFORMATION ON THE CURRENT INTENSITY IS BASED ON DVORAK
INTENSITY ANALYSES AND SURFACE WINDS DATA ESTIMATED FROM SEA
SURFACE AMVS.
2.SYNOPTIC SITUATION
THE SYSTEM IS MOVING NORTHWESTWARD ALONG THE SOUTHWESTERN
PERIPHERY OF A MID-LEVEL SUB-TROPICAL HIGH. ANIMATED MSI SHOWS THE
SEPARATION OF ACTIVE CONVECTIVE CLOUD CLUSTERS FROM THE CSC,
INDICATING INTERFERENCE FROM INTENSIFICATION. ANIMATED MSI SHOWS
GOOD CLOUD CHARACTERISTICS OF ANTICYCLONIC OUTFLOW.
3.TRACK FORECAST
THE SYSTEM WILL MOVE NORTHWESTWARD ALONG THE PERIPHERY OF A
MID-LEVEL SUB-TROPICAL HIGH UNTIL FT72. THE SYSTEM WILL THEN MOVE
NORTHWARD UNTIL FT96. THE TRACK FORECAST IS BASED ON GSM
PREDICTIONS, AND REFERENCE TO OTHER NWP MODELS. TRACK FORECAST
CONFIDENCE IS LOW DUE TO SIGNIFICANT DIFFERENCES AMONG NWP MODEL
OUTPUTS.
4.INTENSITY FORECAST
THE SYSTEM WILL DEVELOP UNTIL FT24 DUE TO THE INFLUENCE OF
INTERACTION WITH HIGH SSTS AND HIGH TCHP. THE SYSTEM WILL THEN
MAINTAIN ITS INTENSITY UNTIL FT48 DUE TO THE INFLUENCE OF
INTERACTION WITH HIGH SSTS, HIGH TCHP AND DRY AIR. THE SYSTEM WILL
THEN WEAKEN UNTIL FT96 DUE TO THE INFLUENCE OF DRY AIR. THE
INTENSITY FORECAST IS BASED ON A CONSENSUS OF GUIDANCE DATA
INCLUDING GSM.
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