ABPW10 PGTW 140600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND
/SOUTH PACIFIC OCEANS/140600Z-150600ZJUL2021//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY: NONE.
   B. TROPICAL DISTURBANCE SUMMARY:
      (1) AN AREA OF CONVECTION (INVEST 98W) HAS PERSISTED NEAR 
17.5N 137.5E, APPROXIMATELY 484 NM WEST-NORTHWEST OF GUAM. ANIMATED 
MULTISPECTRAL SATELLITE IMAGERY AND A PARTIAL 140343Z AMSR2 89GHZ 
MICROWAVE IMAGE DEPICT WEAK FORMATIVE BANDING WITH ASSOCIATED AREAS 
OF DEEP CONVECTION IN THE SOUTHEAST QUADRANT OF A LOW LEVEL 
CIRCULATION. ENVIRONMENTAL ANALYSIS INDICATES MARGINAL CONDITIONS 
FOR DEVELOPMENT WITH GOOD EQUATORWARD OUTFLOW ALOFT AND WARM (30-
31C) SEA SURFACE TEMPERATURES, OFFSET BY MODERATE (15-20 KTS) 
VERTICAL WIND SHEAR (VWS). GFS AND NAVGEM HAVE BEEN CONSISTENT WITH 
FORMATION OF A TROPICAL CYCLONE NEAR THIS LOCATION FOR THE PAST FOUR 
MODEL RUNS. NUMERICAL MODELS ARE IN GENERAL AGREEMENT THAT INVEST 
98W WILL TRACK POLEWARD AS IT QUICKLY CONSOLIDATES AND INTENSIFIES 
OVER THE NEXT 24-48 HOURS. IN THE UPPER LEVELS, OUTFLOW IS EXPECTED 
TO GRADUALLY IMPROVE WITH DECREASING VWS OVER THE NEXT 1 TO 2 DAYS 
DUE TO A FAVORABLE CONFIGURATION OF AN UPPER LOW OVER WESTERN JAPAN 
AND THE TUTT TO THE NORTHEAST. MAXIMUM SUSTAINED SURFACE WINDS ARE 
ESTIMATED AT 13 TO 18 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED 
TO BE NEAR 1006 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A 
SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS MEDIUM.
      (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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