ABPW10 PGTW 101730
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH 
PACIFIC OCEANS REISSUED/101730Z-110600ZAPR2023//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/100221ZAPR2023//
AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY: NONE.
   B. TROPICAL DISTURBANCE SUMMARY:
      (1) THE AREA OF CONVECTION (INVEST 90) PREVIOUSLY LOCATED NEAR 
10.0N 131.2E IS NOW LOCATED NEAR 13N 130.9E, APPROXIMATELY 417 NM EAST OF 
LEGAZPI, PHILIPPINES. THE 101200Z POSITION HAS BEEN UPDATED BASED ON A 
REANALYSIS OF AVAILABLE SATELLITE DATA AND SCATTEROMETERY. 90W HAS BEEN 
RELOCATED APPROXIMATELY 170NM NORTH-NORTHWEST OF PREVIOUSLY ASSSED 
101200Z POSITION. ANIMATED ENHANCED INFRARED (EIR) SATELLITE IMAGERY AND 
101315Z ASCAT-C PASS REVEALED A BROAD, MONSOON DEPRESSION-LIKE FEATURE 
CENTERED NEAR 10N, WITH AN AREA OF EMBEDDED, CYCLONICALLY CURVED 
CONVECTION FURTHER NORTH NEAR 13N. THE SCATTEROMETERY DATA IS 
INCONCLUSIVE DUE TO WEAK NATURE OF THE WIND FIELD NEAR THE CENTER OF THE 
SYSTEM, BUT WHEN COMBINED WITH NEARBY SURFACE OBSERVATIONS AND ANIMATED 
EIR AND PROXY VISIBLE IMAGERY, LENDS INCREASED CONFIDENCE TO THE FACT 
THAT THE POSITION IS ACTUALLY FURTHER NORTH THAN PREVIOUSLY ASSESSED. 
ENVIRONMENTAL ANALYSIS REVEALS MARGINAL CONDITIONS FOR DEVELOPMENT WITH 
MODERATE POLEWARD OUTFLOW ALOFT AND WARM (29-30C) SST, OFFSET BY MODERATE 
TO HIGH (20-25KT) VWS. GLOBAL MODELS ARE IN AGREEMENT THAT 90W WILL 
GRADUALLY DEVELOP AS IT CONTINUES TO TRACK WEST-NORTHWESTWARD OVER THE 
NEXT 48 HOURS. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 20 TO 24 
KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1004 MB. THE 
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN 
THE NEXT 24 HOURS REMAINS HIGH. SEE REF A (WTPN21 PGTW 100230) FOR 
FURTHER DETAILS.
      (2) 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: UPDATED 1200Z POSITION INFORMATION FOR 
90W.//
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