WTPQ31 RJTD 081200
RSMC TROPICAL CYCLONE PROGNOSTIC REASONING
REASONING NO. 1 FOR TD LOCATED AT 8.8N 133.8E
1.GENERAL COMMENTS
A TD IS LOCATED AT 8.8N, 133.8E. INFORMATION ON THE CURRENT
POSITION IS BASED ON ANIMATED MSI. POSITIONAL ACCURACY IS POOR
BECAUSE THE CSC IS OBSCURE. CENTRAL PRESSURE IS 1008HPA AND
MAXIMUM SUSTAINED WINDS ARE 30KNOTS. THE SYSTEM IS IN A FAVORABLE
ENVIRONMENT FOR DEVELOPMENT UNDER THE INFLUENCE OF HIGH SSTS, WEAK
VWS AND GOOD UPPER-LEVEL OUTFLOW. 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
SURFACE OBSERVATIONS.
2.SYNOPTIC SITUATION
THE SYSTEM IS MOVING SLOWLY NORTHWESTWARD ALONG THE SOUTHWESTERN
PERIPHERY OF A MID-LEVEL SUB-TROPICAL HIGH. ANIMATED MSI SHOWS CB
CLUSTERS ARE SCATTERED AROUND THE CSC. DMSP-F17/SSMIS 89 GHZ
MICROWAVE IMAGERY SHOWS THE SYSTEM HAS ACTIVE CONVECTIVE CLOUD
CLUSTERS AROUND THE CSC.
3.TRACK FORECAST
THE SYSTEM WILL GRADUALLY TURN TO THE WEST ALONG THE PERIPHERY OF
A MID-LEVEL SUB-TROPICAL HIGH UNTIL FT72. THE SYSTEM WILL THEN
MOVE WESTWARD UNTIL FT120. THE TRACK FORECAST IS BASED ON GSM
PREDICTIONS, AND REFERENCE TO OTHER NWP MODELS. TRACK FORECAST
CONFIDENCE IS FAIR UNTIL FT72 BUT LOW THEREAFTER DUE TO
SIGNIFICANT DIFFERENCES AMONG NWP MODEL OUTPUTS.
4.INTENSITY FORECAST
THE SYSTEM WILL DEVELOP UNTIL FT72 DUE TO THE INFLUENCE OF
INTERACTION WITH HIGH SSTS, WEAK VWS AND GOOD UPPER LEVEL OUTFLOW.
THE SYSTEM WILL THEN WEAKEN UNTIL FT96 DUE TO THE INFLUENCE OF
LAND. THE SYSTEM WILL THEN DEVELOP UNTIL FT120 DUE TO ITS PRESENCE
OVER THE SEA. THE INTENSITY FORECAST IS BASED ON GUIDANCE DATA.
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