WTPN31 PGTW 201500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL DEPRESSION 28W (RAI) WARNING NR 031//
RMKS/
1. TROPICAL DEPRESSION 28W (RAI) WARNING NR 031    
   DOWNGRADED FROM TROPICAL STORM 28W
   01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   201200Z --- NEAR 18.8N 112.5E
     MOVEMENT PAST SIX HOURS - 055 DEGREES AT 08 KTS
     POSITION ACCURATE TO WITHIN 020 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   REPEAT POSIT: 18.8N 112.5E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   210000Z --- 19.9N 114.0E
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 24 HR POSIT: 065 DEG/ 09 KTS
    ---
   24 HRS, VALID AT:
   211200Z --- 20.7N 115.8E
   MAX SUSTAINED WINDS - 015 KT, GUSTS 025 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
201500Z POSITION NEAR 19.1N 112.9E.
20DEC21. TROPICAL DEPRESSION 28W (RAI), LOCATED APPROXIMATELY 231 NM 
SOUTH-SOUTHWEST OF HONG KONG, HAS TRACKED NORTHEASTWARD AT 08 KNOTS 
OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED (EIR) SATELLITE 
IMAGERY SHOWS THE SYSTEM CONTINUED TO RAPIDLY DETERIORATE AS THE 
CENTRAL CONVECTION HAS FURTHER COLLAPSED AND DISINTEGRATED AS IT IS 
NOW SHEARED 100+ NM NORTHEASTWARD OF A FULLY EXPOSED AND RAGGED LOW 
LEVEL CIRCULATION (LLC). THE INITIAL POSITION IS PLACED WITH HIGH 
CONFIDENCE BASED ON THE EXPOSED LLC. THE INITIAL INTENSITY IS 
EXTRAPOLATED WITH MEDIUM CONFIDENCE BASED ON A SERIES OF 
SCATTEROMETER DATA AND REFLECTS THE RAPID DETERIORATION. TD RAI IS 
IN A HIGHLY UNFAVORABLE ENVIRONMENT WITH STRONG (25+ KTS) RELATIVE 
VWS, COOL (25C) SSTS IN THE SOUTH CHINA SEA (SCS), AND COLD DRY AIR 
INTRUSION IN THE LOW LEVELS ASSOCIATED WITH THE NORTHEAST COLD SURGE 
IN THE SCS. THE SYSTEM IS EXPECTED TO DISSIPATE WITHIN 12 HOURS. 
THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WRNCEN 
PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF 
REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 201200Z IS 10 FEET.
//
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