ABPW10 PGTW 210600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH 
PACIFIC OCEANS/210600Z-220600ZAUG2026//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/210151ZAUG2026//
REF/B/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/210152ZAUG2026//
NARR/REFS A AND B ARE TROPICAL CYCLONE WARNINGS.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY:
      (1) AT 21AUG26 0000Z, TROPICAL STORM 17W (SAUDEL) WAS LOCATED 
NEAR 14.7N 149.0E, APPROXIMATELY 188 NM EAST OF SAIPAN, AND HAD 
TRACKED NORTH-NORTHWESTWARD AT 12 KNOTS OVER THE PAST SIX HOURS. 
MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 45 KNOTS GUSTING TO 
55 KNOTS. SEE REF A (WTPN31 PGTW 210300) FOR FURTHER DETAILS.
      (2) AT 21AUG26 0000Z, TROPICAL DEPRESSION 18W (EIGHTEEN) WAS 
LOCATED NEAR 20.2N 108.6E, APPROXIMATELY 159 NM EAST-SOUTHEAST OF 
HANOI, VIETNAM, AND HAD TRACKED EAST-NORTHEASTWARD AT 02 KNOTS OVER 
THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 
30 KNOTS GUSTING TO 40 KNOTS. SEE REF B (WTPN32 PGTW 210300) FOR 
FURTHER DETAILS.
      (3) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY: NONE.
   C. SUBTROPICAL SYSTEM SUMMARY:
      (1) THE AREA OF CONVECTION (INVEST 96W) PREVIOUSLY LOCATED NEAR 
35.6N 160.9E IS NOW LOCATED NEAR 38.7N 158.7E, APPROXIMATELY 809 NM 
EAST OF MISAWA, JAPAN. THE SYSTEM IS CURRENTLY CLASSIFIED AS A 
SUBTROPICAL CYCLONE, GENERALLY CHARACTERIZED AS HAVING BOTH TROPICAL 
AND MIDLATITUDE CYCLONE FEATURES. ANIMATED ENHANCED MULTISPECTRAL 
SATELLITE IMAGERY (MSI) DEPICTS INVEST 96W WITH A FULLY EXPOSED LOW-
LEVEL CIRCULATION CENTER (LLCC) AND ASSOCIATED CONVECTION OVER THE 
NORTHERN PERIPHERY. A POTENT UPPER-LEVEL LOW PRESENTLY INHIBITS 
CONVECTIVE ACTIVITY OVER THE CENTER, AND PLENTY OF DRY AIR IS WRAPPING 
INTO THE CIRCULATION. A 202350 METOP-C ASCAT PASS REVEALED AN 
ASYMMETRIC, ALMOST FRONT-LIKE, WIND FIELD WITH MAXIMUM 30-35 KT WINDS 
WITHIN THE SOUTHEASTERN QUADRANT. ENVIRONMENTAL CONDITIONS AROUND THIS 
SYSTEM REMAIN UNFAVORABLE FOR DEVELOPMENT INTO A TROPICAL CYCLONE DUE 
TO THE COOL SEA SURFACE TEMPERATURES, SUBSIDENCE INDUCED BY THE UPPER-
LEVEL LOW, AND THE SURROUNDING DRY AIR. DETERMINISTIC MODELS SHOW 96W 
TRANSITING NORTHEASTWARD AND DIMINISHING AS THE UPPER-LEVEL LOW 
WEAKENS AND THE ENVIRONMENTAL CONDITIONS BECOME MORE HOSTILE WITH 
TIME. FOR HAZARDS AND WARNINGS, REFERENCE THE FLEET WEATHER CENTER SAN 
DIEGO HIGH WINDS AND SEAS PRODUCT OR REFER TO LOCAL WMO DESIGNATED 
FORECAST AUTHORITY. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 
33 TO 38 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 
1003 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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