ABPW10 PGTW 081800
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH 
PACIFIC OCEANS REISSUED/081800Z-090600ZSEP2023//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/081351ZSEP2023//
AMPN/REF A IS A TROPICAL CYCLONE WARNING.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY:
      (1) AT 08SEP23 1200Z, TROPICAL DEPRESSION 12W (YUN-YEUNG) WAS 
LOCATED NEAR 33.6N 138.0E, APPROXIMATELY 132 NM SOUTHWEST OF YOKOSUKA, 
JAPAN, AND HAD TRACKED NORTH-NORTHEASTWARD AT 11 KNOTS OVER THE PAST 
SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 30 KNOTS 
GUSTING TO 40 KNOTS. SEE REF A (WTPN31 PGTW 081500) FOR FURTHER 
DETAILS.
      (2) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY:
      (1) AN AREA OF CONVECTION (INVEST 91W) HAS PERSISTED NEAR 22.0N 
116.7W, APPROXIMATELY 204 NM WEST OF KAOHSIUNG, TAIWAN. ANIMATED 
ENHANCED INFRARED SATELLITE IMAGERY AND A 081258Z AMSU-B MICROWAVE 
IMAGE REVEAL AN ELONGATED CIRCULATION ALONG A LOW LEVEL TROUGHING AREA 
ORIENTED SOUTH-SOUTHWEST TO NORTH-NORTHEAST. ANALYSIS SHOWS THAT THE 
INVEST IS IN A MARGINALLY FAVORABLE ENVIRONMENT FOR DEVELOPMENT 
DEFINED BY ROBUST EQUATORWARD OUTFLOW ALOFT AND VERY WARM (31C) SEA 
SURFACE TEMPERATURES OFFSET BY HIGH (25-30 KT) VERTICAL WIND SHEAR. 
GLOBAL NUMERICAL MODELS ARE IN FAIR AGREEMENT THAT INVEST 91W WILL 
TRACK NORTHEASTWARD THROUGH THE TAIWAN STRAIT OVER THE NEXT 24-48 
HOURS. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 15 TO 20 
KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1006 MB. THE 
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN 
THE NEXT 24 HOURS IS LOW.
      (2) AN AREA OF CONVECTION (INVEST 90W) HAS PERSISTED NEAR 14.5N 
141.5E, APPROXIMATELY 199 NM WEST-NORTHWEST OF GUAM. ANIMATED ENHANCED 
INFRARED SATELLITE IMAGERY DEPICTS CENTRALIZED FLARING CONVECTION WITH 
DISCRETE, SHALLOW BANDS WRAPPING INTO A BROAD LOW-LEVEL CIRCULATION. 
ENVIRONMENTAL ANALYSIS SHOWS THE INVEST IS IN A FAVORABLE ENVIRONMENT 
FOR DEVELOPMENT DEFINED BY GOOD POLEWARD OUTFLOW ALOFT, LOW (5-10 KT) 
VERTICAL WIND SHEAR, AND WARM (29-30C) SEA SURFACE TEMPERATURES. 
GLOBAL MODELS ARE IN AGREEMENT THAT INVEST 90W WILL GRADUALLY 
INTENSIFY AS IT TRAVELS NORTHEASTWARD OVER THE NEXT 48-72 HOURS. 
MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 15 TO 20 KNOTS. 
MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1006 MB. THE 
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN 
THE NEXT 24 HOURS IS LOW.
      (3) NO OTHER SUSPECT AREAS.
   C. SUBTROPICAL SYSTEM SUMMARY: NONE.
2. SOUTH PACIFIC AREA (WEST COAST OF SOUTH AMERICA TO 135 EAST):
   A. TROPICAL CYCLONE SUMMARY: NONE.
   B. TROPICAL DISTURBANCE SUMMARY: NONE.
   C. SUBTROPICAL SYSTEM SUMMARY: NONE.//
3. JUSTIFICATION FOR REISSUE: ADDED LOW AREAS IN PARAGRAPHS 1.B.(1) 
AND 1.B.(2).//
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