ABPW10 PGTW 070600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH 
PACIFIC OCEANS/070600Z-080600ZJUL2021//
REF/A/JOINT TYPHOON WRNCEN PEARL HARBOR HI/070021ZJUL2021//
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 97W) PREVIOUSLY LOCATED 
NEAR 18.0N 110.3E IS NOW LOCATED NEAR 18.5N 109.4E, APPROXIMATELY 15 
NM NORTH OF SANYA, HAINAN. ANIMATED MULTISPECTRAL SATELLITE IMAGERY 
(MSI) AND A 070400Z GMI 89GHZ MICROWAVE PARTIAL IMAGE DEPICT 
FORMATIVE CONVECTIVE BANDS BEGINNING TO WRAP INTO A LOW LEVEL 
CIRCULATION CENTER (LLCC). A 070123Z ASCAT-A PASS REVEALS THAT THE 
LLCC IS OVER LAND AND A SWATH OF 20-25 KT WINDS IN THE EASTERN 
PERIPHERY. ANALYSIS REVEALS A FAVORABLE ENVIRONMENT FOR DEVELOPMENT 
CHARACTERIZED BY LOW TO MODERATE (10-20 KT) VERTICAL WIND SHEAR 
(VWS), WESTWARD OUTFLOW, AND WARM SEA SURFACE TEMPERATURES (30-31C) 
SURROUNDING THE LLCC. GLOBAL DYNAMIC MODELS ARE IN GOOD AGREEMENT 
THAT 97W WILL CONTINUE TO TRACK ALONG THE PERIPHERY OF A SUBTROPICAL 
RIDGE SITUATED TO THE NORTH AND NORTHEAST AS IT CONSOLIDATES AND 
TRACKS GENERALLY WESTWARD. MAXIMUM SUSTAINED SURFACE WINDS ARE 
ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED 
TO BE NEAR 1002 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A 
SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS HIGH. 
SEE REF A (WTPN21 PGTW 070030) 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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