ABPW10 PGTW 300600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH 
PACIFIC OCEANS/300600Z-310600ZJUL2025//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/300152ZJUL2025//
REF/B/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/300151ZJUL2025//
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 30JUL25 0000Z, TROPICAL STORM 12W (KROSA) WAS LOCATED 
NEAR 28.7N 142.8E, APPROXIMATELY 426 NM SOUTH-SOUTHEAST OF YOKOSUKA, 
JAPAN, AND HAD TRACKED NORTHWARD AT 00 KNOTS OVER THE PAST SIX HOURS. 
MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 40 KNOTS GUSTING TO 
50 KNOTS. SEE REF A (WTPN31 PGTW 300300) FOR FURTHER DETAILS.
      (2) AT 30JUL25 0000Z, TROPICAL STORM 11W (CO-MAY) WAS LOCATED 
NEAR 30.0N 122.3E, APPROXIMATELY 83 NM SOUTH-SOUTHEAST OF SHANGHAI, 
CHINA, AND HAD TRACKED NORTHWESTWARD AT 09 KNOTS OVER THE PAST SIX 
HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 40 KNOTS 
GUSTING TO 50 KNOTS. SEE REF B (WTPN33 PGTW 300300) FOR FURTHER 
DETAILS.
      (3) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY: NONE
   C. SUBTROPICAL SYSTEM SUMMARY:
      (1) THE AREA OF CONVECTION (INVEST 92W) PREVIOUSLY LOCATED NEAR 
34.2N 151.4E IS NOW LOCATED NEAR 34.9N 154.0E, APPROXIMATELY 744 NM 
EAST OF TOKYO, JAPAN. THE SYSTEM IS CURRENTLY CLASSIFIED AS A 
SUBTROPICAL CYCLONE, GENERALLY CHARACTERIZED AS HAVING BOTH TROPICAL 
AND MIDLATITUDE CYCLONE FEATURES. ANIMATED INHANCED INFRARED SATELLITE 
IMAGERY DEPICTS A WEAK LLCC ON THE SOUTHEASTERN FLANK OF AN UPPER-
LEVEL TROUGH WHILE BEING PARTIALLY EXPOSED ON THE WESTERN SEMICIRCLE. 
A 300318Z ATMS 88.2GHZ IMAGE DEPICTS THE SYSTEM WITH A DEEPER 
CONVECTIVE CLOUD SYSTEM ON THE EASTERN SIDE WITH LITTLE TO NO 
CONVECTION ON THE OPPPOSITE SIDE. ENVIRONMENTAL ANALYSIS REVEALS 
UNFAVORABLE CONDITIONS FOR TROPICAL TRANSITION DEFINED BY A DEEP LAYER 
OF DRY AIR BEING ADVECTED OVER THE LOW LEVEL CIRCULATION AND HIGH (30 
KNOTS) WESTERLY VERTICAL WIND SHEAR ASSOCIATED WITH AN APPROACHING 
LONGWAVE TROUGH. FURTHERMORE, THE SYSTEM IS FAST APPROACHING WATERS 
NOT CONDUCIVE FOR TROPICAL DEVELOPMENT (COOLER THAN 26C). GLOBAL 
DETERMINISTIC MODELS ARE IN AGREEMENT ON A NORTHEASTWARD TRACK WITH AN 
ASYMMETRIC WIND FIELD OVER THE NEXT 24 TO 48 HOURS. MAXIMUM SUSTAINED 
SURFACE WINDS ARE ESTIMATED AT 28 TO 33 KNOTS. MINIMUM SEA LEVEL 
PRESSURE IS ESTIMATED TO BE NEAR 1000 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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