ABPW10 PGTW 222230
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL/HARBOR/HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH 
PACIFIC OCEANS REISSUED/222230Z-230600ZJUL2021//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/221952ZJUL2021//
REF/B/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/221951ZJUL2021//
REF/C/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/222151ZJUL2021//
NARR/REFS A AND B ARE TROPICAL CYCLONE WARNINGS. REF C IS A TROPICAL 
CYCLONE FORMATION ALERT.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY:
      (1) AT 22JUL21 1800Z, TROPICAL DEPRESSION 10W (CEMPAKA) WAS 
LOCATED NEAR 21.4N 107.4E, APPROXIMATELY 382 NM WEST OF HONG KONG, 
AND HAD TRACKED SOUTHWESTWARD AT 08 KNOTS OVER THE PAST SIX HOURS. 
MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 25 KNOTS GUSTING 
TO 35 KNOTS. SEE REF A (WTPN32 PGTW 222100) FOR FURTHER DETAILS.
      (2) AT 22JUL21 1800Z, TYPHOON 09W (IN-FA) WAS LOCATED NEAR 
23.7N 125.5E, APPROXIMATELY 209 NM SOUTHWEST OF KADENA AB, AND HAD 
TRACKED WEST-NORTHWESTWARD AT 04 KNOTS OVER THE PAST SIX HOURS. 
MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 80 KNOTS GUSTING 
TO 100 KNOTS. SEE REF B (WTPN31 PGTW 222100) FOR FURTHER DETAILS.
      (3) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY: NONE.
   C. SUBTROPICAL SYSTEM SUMMARY:
      (1) AN AREA OF CONVECTION (INVEST 90W) PREVIOUSLY LOCATED NEAR 
21.4N 144.9E IS NOW LOCATED NEAR 21.7N 144.7E, APPROXIMATELY 366 
EAST-SOUTHEAST OF IWO-TO. THE SYSTEM IS CURRENTLY CLASSIFIED AS A 
SUBTROPICAL STORM/DEPRESSION, GENERALLY CHARACTERIZED AS HAVING BOTH 
TROPICAL AND MIDLATITUDE CYCLONE FEATURES. ANIMATED ENHANCED 
INFRARED SATELLITE IMAGERY (EIR) AND A 221852Z SSMIS 91 GHZ 
MICROWAVE IMAGE DEPICT A LOW LEVEL CIRCULATION CENTER (LLCC) FORMING 
ALONG THE EASTERN EXTENT OF THE MONSOON TROUGH WITH DEEP CONVECTION 
OFFSET TO THE EASTERN AND SOUTHEASTERN PERIPHERIES. ENVIRONMENTAL 
ANALYSIS INDICATES FAVORABLE CONDITIONS FOR DEVELOPMENT, WITH ROBUST 
EQUATORWARD OUTFLOW, LOW (10-15 KTS) VERTICAL WIND SHEAR (VWS), AND 
WARM (29-30C) SEA SURFACE TEMPERATURES (SST). THIS DISTURBANCE IS 
EXPECTED TO DEVELOP QUICKLY AS A SUBTROPICAL CYCLONE AND IS 
FORECASTED TO INTENSIFY AS IT TRACKS NORTHEASTWARD WITHIN A DEEP 
UPPER-LEVEL TROUGH WITH WEAK BAROCLINICITY. GLOBAL MODELS INDICATE 
THAT AS THE SYSTEM TRACKS TOWARD CENTRAL HONSHU, THE SYSTEM WILL 
TRANSITION TO A WARM-CORE TROPICAL SYSTEM EAST OF THE KANTO PLAIN. 
WHILE THE SYSTEM IS SUBTROPICAL, REFERENCE THE FLEET WEATHER CENTER 
SAN DIEGO HIGH WINDS AND SEAS PRODUCT OR REFER TO THE LOCAL WMO 
DESIGNATED FORECAST AUTHORITY FOR HAZARDS AND WARNINGS. MAXIMUM 
SUSTAINED SURFACE WINDS ARE ESTIMATED AT 18 TO 23 KNOTS. MINIMUM SEA 
LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1004 MB. THE POTENTIAL FOR 
THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 
HOURS IS UPGRADED TO HIGH. SEE REF C (WTPN21 PGTW 222200) FOR 
FURTHER DETAILS. 
      (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.
3. JUSTIFICATION FOR REISSUE: UPGRADED AREA IN PARA 1.C.(1) TO 
HIGH.//
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