ABPW10 PGTW 150600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND
/SOUTH PACIFIC OCEANS/150600Z-160600ZJUL2020//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
A. TROPICAL CYCLONE SUMMARY: NONE.
B. TROPICAL DISTURBANCE SUMMARY:
(1) THE AREA OF CONVECTION (INVEST 99W) PREVIOUSLY LOCATED
NEAR 20.9N 120.7E IS NOW LOCATED NEAR 23.9N 122.3E, APPROXIMATELY 82
NM SOUTHEAST OF TAIPEI, TAIWAN. ANIMATED MULTISPECTRAL SATELLITE
IMAGERY AND A 150111Z GMI 89GHZ MICROWAVE IMAGE DEPICTS A RAGGED
AND FULLY EXPOSED LOW LEVEL CIRCULATION WITH FLARING CONVECTION
SHEARED FAR TO THE SOUTHWEST. INVEST 99W IS IN AN UNFAVORABLE
ENVIRONMENT WITH STRONG (30-35 KT) VERTICAL WIND SHEAR (VWS),
STRAIGHT LINE NORTHEASTERLY FLOW, AND (29-30 CELSIUS) SEA SURFACE
TEMPERATURES. ASCAT IMAGERY INDICATES THAT 99W IS EMBEDDED IN AN
EXTENSIVE REGION OF 15-20KT SOUTHERLY FLOW. NUMERICAL MODELS ARE IN
GOOD AGREEMENT THAT THE SYSTEM WILL MAINTAIN ITS MARGINAL STATE AT
BEST OVER THE NEXT 24HRS AS IT CONTINUES TO TRACK POLEWARD TOWARD
OKINAWA BEFORE IT EVENTUALLY TRACKS UNDER STRONG WESTERLY FLOW
PERSISTING OVER OKINAWA. MAXIMUM SUSTAINED SURFACE WINDS ARE
ESTIMATED AT 12 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 DOWNGRADED
TO LOW.
(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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