WTTH20 VTBB 230600 TROPICAL STORM ADVISORY NAME TS SHANSHAN 1302 HAS DOWNGRADED TO TD PSTN 230600 UTC 4.0 N 109.0 E MOVE WSW SLOWLY PRES 1006 HPA MAXD 35 KT FORECAST 24 HR 240600 UTC 8.0 N 108.0 E MOVE WSW SLOWLY PRES 1010 HPA MAXD 25 KT