Advisories

WTPN32 PGTW 252100
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL DEPRESSION 18W (NARRA) WARNING NR 021//
RMKS/
1. TROPICAL DEPRESSION 18W (NARRA) WARNING NR 021    
   03 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   251800Z --- NEAR 20.0N 109.6E
     MOVEMENT PAST SIX HOURS - 055 DEGREES AT 08 KTS
     POSITION ACCURATE TO WITHIN 060 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: 20.0N 109.6E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   260600Z --- 20.9N 110.3E
   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: 015 DEG/ 05 KTS
    ---
   24 HRS, VALID AT:
   261800Z --- 21.9N 110.6E
   MAX SUSTAINED WINDS - 015 KT, GUSTS 025 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND
    ---
REMARKS:
252100Z POSITION NEAR 20.2N 109.8E.
25AUG26. TROPICAL DEPRESSION 18W (NARRA), LOCATED APPROXIMATELY
216 NM EAST-SOUTHEAST OF HANOI, VIETNAM, HAS TRACKED
NORTHEASTWARD AT 08 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED
INFRARED (EIR) IMAGERY REVEALS THAT TROPICAL DEPRESSION (TD) 19W
(NARRA) HAS BECOME UNIDENTIFIABLE AS A CIRCULATION WITHIN A HOSTILE
ENVIRONMENT DEVOID OF CONVECTION AND DOMINATED BY VERY HIGH
(35-40 KTS) VERTICAL WIND SHEAR. 19W IS ALSO UNIDENTIFIABLE IN THE
COMPOSITE RADAR COVERING THE AREA. NARRA IS FORECAST TO CONTINUE
TRACKING GENERALLY NORTHEASTWARD ALONG THE COAST OF HAINAN
WHILE FURTHER UNRAVELING, EVENTUALLY MOVING OVER MAINLAND CHINA AND
FULLY DISSIPATING. GLOBAL DETERMINISTIC MODELS, GFS AND ECMWF,
INDICATE THE REMNANT CIRCULATION IS NO LONGER CLOSED AND WILL BE
COMPLETELY GONE 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. MINIMUM CENTRAL
PRESSURE AT 251800Z IS 999 MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT
251800Z IS 12 FEET.
REFER TO TYPHOON 17W (SAUDEL) WARNINGS (WTPN31 PGTW) FOR SIX-HOURLY
UPDATES.
REFER TO TROPICAL DEPRESSION 19W (ATSANI) FINAL
WARNING (WTPN33 PGTW).//
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