ABPW10 PGTW 090600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH 
PACIFIC OCEANS/090600Z-100600ZAPR2023//
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 90W) PREVIOUSLY LOCATED NEAR 
8.2N 138.8E IS NOW LOCATED NEAR 9.2N 136.4E, APPROXIMATELY 101 NM WEST OF 
YAP. ANIMATED MULTISPECTRAL SATELLITE IMAGERY DEPICTS A BROAD LOW-LEVEL 
CIRCULATION (LLC) WITH FLARING CONVECTION AROUND THE LLC AND FRAGMENTED 
FORMATIVE BANDING ALONG THE OUTER PERIPHERY. A 090050Z ASCAT-C PASS 
REVEALS AN ELONGATED LLC WITH A SWATH OF 20 KNOT WINDS OFFSET TO THE 
NORTH. A RECENT YAP SOUNDING SHOWS A DRY AND STABLE ENVIRONMENT WHILE THE 
SURFACE OBSERVATIONS INDICATE LIGHT AND VARIABLE WINDS WITH A FLAT 
PRESSURE TENDENCY OVER THE LAST 24 HOURS. ENVIRONMENTAL ANALYSIS REVEALS 
MARGINALLY FAVORABLE CONDITIONS FOR DEVELOPMENT WITH MODERATE POLEWARD 
OUTFLOW ALOFT AND WARM (30-31C) SST, OFFSET BY MODERATE TO HIGH (20-25KT) 
VWS. GLOBAL MODELS ARE IN AGREEMENT THAT 90W WILL GRADUALLY DEVELOP AS IT 
TRACKS WEST-NORTHWESTWARD TOWARD THE PHILIPPINES. MAXIMUM SUSTAINED 
SURFACE WINDS ARE ESTIMATED AT 15 TO 20 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 IS UPGRADED TO 
MEDIUM.
      (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.//
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