WTPQ32 RJTD 140600
RSMC TROPICAL CYCLONE PROGNOSTIC REASONING
REASONING NO.13 FOR TS 2016 NANGKA (2016)
1.GENERAL COMMENTS
TS NANGKA IS LOCATED ON LAND AT 20.0N, 106.2E. 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 ARE 35KNOTS. THE SYSTEM IS IN
AN UNFAVORABLE ENVIRONMENT FOR DEVELOPMENT UNDER THE INFLUENCE OF
HIGH SSTS, REDUCED TCHP, INCREASED VWS, GOOD UPPER-LEVEL OUTFLOW
AND LAND. THIS HAS CAUSED THE SYSTEM TO WEAKEN 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 SOUTHWESTERN PERIPHERY OF
A MID-LEVEL SUB-TROPICAL HIGH. ANIMATED MSI SHOWS CB CLUSTERS
GATHERING AROUND THE CSC AND FORMING A CURVED BAND. ANIMATED MSI
SHOWS GOOD CLOUD CHARACTERISTICS OF ANTICYCLONIC OUTFLOW. WATER
VAPOR IMAGERY SHOWS DRY AIR AROUND THE SYSTEM. DMSP-F17/SSMIS 89
GHZ MICROWAVE IMAGERY SHOWS THE SYSTEM HAS ACTIVE CONVECTIVE CLOUD
CLUSTERS AROUND THE CSC.
3.TRACK FORECAST
THE SYSTEM WILL MOVE WESTWARD ALONG THE PERIPHERY OF A MID-LEVEL
SUB-TROPICAL HIGH UNTIL FT24. 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 WEAKEN UNTIL FT24 DUE TO ITS CONTINUED PRESENCE
OVER LAND. THE SYSTEM WILL WEAKEN TO TD INTENSITY BY FT12. THE
INTENSITY FORECAST IS BASED ON A CONSENSUS OF GUIDANCE DATA
INCLUDING GSM.
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