WTPN32 PGTW 180300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL DEPRESSION 19W (CHANTHU) WARNING NR 048//
RMKS/
1. TROPICAL DEPRESSION 19W (CHANTHU) WARNING NR 048    
   01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   180000Z --- NEAR 34.1N 136.6E
     MOVEMENT PAST SIX HOURS - 085 DEGREES AT 19 KTS
     POSITION ACCURATE TO WITHIN 020 NM
     POSITION BASED ON CENTER LOCATED BY A COMBINATION OF 
     SATELLITE, RADAR AND SYNOPTIC DATA
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   BECOMING EXTRATROPICAL
   REPEAT POSIT: 34.1N 136.6E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   181200Z --- 34.3N 139.9E
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
   VECTOR TO 24 HR POSIT: 085 DEG/ 10 KTS
    ---
   24 HRS, VALID AT:
   190000Z --- 34.4N 142.4E
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
    ---
REMARKS:
180300Z POSITION NEAR 34.2N 137.4E.
18SEP21. TROPICAL DEPRESSION 19W (CHANTHU), LOCATED APPROXIMATELY 
169 NM WEST-SOUTHWEST OF YOKOSUKA, JAPAN, HAS TRACKED EASTWARD AT 19 
KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE 
IMAGERY SHOWS THE SYSTEM CONTINUED TO RAPIDLY WEAKEN AS THE 
ASSOCIATED CONVECTION HAVE BEECOME SHEARED AND FRAGMENTED. THE LOW 
LEVEL CIRCULATION HAS BEEN DIFFICULT TO LOCATE USING SATELLITE AND 
COMPOSITE RADAR IMAGERY. THE INITIAL POSITION, JUST OFFSHORE FROM 
SOUTHERN HONSHU, IS PLACED WITH MEDIUM CONFIDENCE BY EXTRAPOLATION 
FROM NEARBY SURFACE OBSERVATIONS, INCLUDING OWASE AND SHIONOMISAKI. 
THE INITIAL INTENSITY OF 25KTS IS ALSO EXTRAPOLATED FROM NEARBY WIND 
AND SEA LEVEL PRESSURE OBSERVATIONS AND SUPPORTED BY THE DVORAK 
ESTIMATE OF T1.5/25KTS FROM RJTD. TD 19W IS UNDERGOING EXTRA-
TROPICAL TRANSITION AND WILL BECOME A COLD CORE LOW BY TAU 12 AS IT 
CONTINUES EASTWARD INTO THE PACIFIC OCEAN. 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 180000ZIS 10 FEET.//
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