ABPW10 PGTW 140600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH 
PACIFIC OCEANS/140600Z-150600ZAUG2025//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/131951ZAUG2025//
AMPN/REF A IS A TROPICAL CYCLONE FINAL WARNING.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY:
      (1) AT 13AUG25 1800Z, TROPICAL STORM 16W (PODUL) WAS LOCATED 
NEAR 24.3N 116.9E, APPROXIMATELY 191 NM NORTHEAST OF HONG KONG, AND 
HAD TRACKED WEST-NORTHWESTWARD AT 20 KNOTS OVER THE PAST SIX HOURS. 
MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 45 KNOTS GUSTING TO 
55 KNOTS. SEE REF A (WTPN32 PGTW 132100) FOR THE FINAL WARNING ON 
THIS SYSTEM.
      (2) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY: NONE.         
   C. SUBTROPICAL SYSTEM SUMMARY:
      (1) THE AREA OF CONVECTION (INVEST 99W) PREVIOUSLY LOCATED NEAR 
25.6N 178.2E IS NOW LOCATED NEAR 27.7N 179.6E, APPROXIMATELY 163 NM 
WEST OF MIDWAY. THE SYSTEM IS CURRENTLY CLASSIFIED AS A SUBTROPICAL 
CYCLONE, GENERALLY CHARACTERIZED AS HAVING BOTH TROPICAL AND 
MIDLATITUDE CYCLONE FEATURES. ANIMATED ENHANCED INFRARED SATELLITE 
IMAGERY DEPICTS AN EXTREMELY ELONGATED CIRCULATION LOCATED ALONG THE 
SOUTHWESTERN END OF A WEAK FRONTAL BAND AND A PARTIALLY EXPOSED LLCC 
TYPICAL OF A SUBTROPICAL SYSTEM. ENVIRONMENTAL ANALYSIS REVEALS 
UNFAVORABLE CONDITIONS FOR TROPICAL TRANSITION DEFINED BY A DEEP 
LAYER OF DRY AIR BEING ADVECTED OVER THE CIRCULATION, COOL (26-27C) 
SEA SURFACE TEMPERATURES AND LIGHT TO MODERATE NORTHERLY SHEAR 
IMPARTED BY A VERY LARGE UPPERLEVEL LOW POSITIONED TO THE NORTH. 
GLOBAL MODELS ARE IN AGREEMENT THAT 99W WILL CONTINUE TO TRACK 
NORTHEAST AND THEN NORTHWARD OVER THE NEXT 24-48 HOURS, WITH A BROAD 
AND ASYMMETRIC WIND FIELD POSITIONED WELL AWAY FROM THE CENTER. 99W 
WILL MOVE UNDER THE UPPER-LEVEL LOW WITHIN THE NEXT 36 HOURS AND 
TRANSITION TO A COLD-CORE LOW. MAXIMUM SUSTAINED SURFACE WINDS ARE 
ESTIMATED AT 28 TO 33 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED 
TO BE NEAR 1009 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A 
SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS LOW.
      (2) NO OTHER SUBTROPICAL SYSTEMS.
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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