ABPW10 PGTW 180600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND
/SOUTH PACIFIC OCEANS/180600Z-190600ZJUL2021//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/180151ZJUL2021//
REF/B/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/172251ZJUL2021//
NARR/REF A IS A TROPICAL CYCLONE WARNING. REF B IS A TROPICAL
/CYCLONE FORMATION ALERT.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY:
      (1) AT 18JUL21 0000Z, TROPICAL STORM 09W (IN-FA) WAS LOCATED 
NEAR 22.9N 132.3E, APPROXIMATELY 327 NM SOUTHEAST OF KADENA AB, AND 
HAD TRACKED NORTH-NORTHWESTWARD AT 07 KNOTS OVER THE PAST SIX HOURS. 
MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 35 KNOTS GUSTING 
TO 45 KNOTS. SEE REF A (WTPN31 PGTW 180300) FOR FURTHER DETAILS.
      (2) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY:
      (1) THE AREA OF CONVECTION (INVEST 99W) PREVIOUSLY LOCATED 
NEAR 18.4N 115.4E IS NOW LOCATED NEAR 20N 115E, APPROXIMATELY 145 NM 
SOUTH-SOUTHEAST OF HONG KONG. ANIMATED MULTISPECTRAL SATELLITE 
IMAGERY DEPICTS STRONG MIDLEVEL TURNING WITH FORMATIVE BANDING 
ASSOCIATED WITH FLARING CONVECTION WRAPPING INTO A LOW LEVEL 
CIRCULATION CENTER (LLCC). A PARTIAL 172344Z SSMIS 91GHZ MICROWAVE 
IMAGE SHOWS LOW LEVEL BANDING WRAPPING INTO THE LLCC WITH DEEP 
CONVECTION OVER THE NORTHERN SEMI-CIRCLE. ENVIRONMENTAL ANALYSIS 
INDICATES FAVORABLE CONDITIONS FOR DEVELOPMENT WITH WESTWARD OUTFLOW 
ALOFT, LOW (10-15 KTS) VERTICAL WIND SHEAR, AND WARM (31-32C) SEA 
SURFACE TEMPERATURES. NUMERICAL MODEL GUIDANCE SHOWS INVEST 99W 
TRACKING NORTHWESTWARD AS IT CONSOLIDATES AND INTENSIFIES OVER THE 
NEXT 24 HOURS. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 20 
TO 25 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1001 
MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL 
CYCLONE WITHIN THE NEXT 24 HOURS REMAINS HIGH. SEE REF B (WTPN21 
PGTW 172300) 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.//
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