
WTPN21 PGTW 020300
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/TROPICAL CYCLONE FORMATION ALERT REISSUED//
REF/A/MSG/NAVMARFCSTCEN PEARL HARBOR HI/010251ZAUG2009//
AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT.//
RMKS/
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN
A 250 NM RADIUS OF 19.0N 118.4E WITHIN THE NEXT 12 TO 24 HOURS.
AVAILABLE DATA DOES NOT JUSTIFY ISSUANCE OF NUMBERED TROPICAL CYCLONE
WARNINGS AT THIS TIME. WINDS IN THE AREA ARE ESTIMATED TO BE 15 TO 20
KNOTS. METSAT IMAGERY AT 012330Z INDICATES THAT A CIRCULATION CENTER
IS LOCATED NEAR 17.7N 118.5E. THE SYSTEM IS MOVING WESTWARD AT 20
KNOTS.
2. REMARKS:
THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 16.0N 125.9E IS NOW
LOCATED NEAR 17.7N 118.5E, APPROXIMATELY 235 NM NORTHWEST OF MANILA,
PHILIPPINES. RECENT ANIMATED MULTISPECTRAL SATELLITE IMAGERY SHOWS
BROAD CONVECTIVE TURNING WITH NO CLEAR INDICATIONS OF A CONSOLIDATED
LOW LEVEL CIRCULATION CENTER (LLCC). AVAILABLE MICROWAVE IMAGERY IS
ALSO INCONCLUSIVE AS TO THE EXACT LOCATION OF THE LLCC, THOUGH THE
012311Z 91 GHZ SSMIS IMAGE SHOWS SOME CURVED BANDING AND HINTS AT A
CIRCULATION CENTER SOUTH OF 18N. AVAILABLE SCATTEROMETRY PASSES ALSO
MISSED THE CENTER OF THE SYSTEM THOUGH THEY CONTINUE TO DEPICT STRONGER
WINDS OF 25 TO 35 KNOTS ON THE PERIPHERY. UPPER LEVEL ANALYSIS INDI-
CATES THE SYSTEM HAS CONTINUED TO MOVE INTO AN AREA OF MINIMAL
VERTICAL WIND SHEAR AND ANIMATED WATER VAPOR IMAGERY SUGGESTS THE
SYSTEM HAS GOOD RADIAL OUTFLOW PROVIDED BY AN ANTICYCLONE ALOFT. THERE
IS UNCERTAINTY IN THE POSITION AND FORECAST TRACK OF THE SYSTEM AS
NUMERICAL GUIDANCE IS LOOKING TO SLOW THE SYSTEM BEFORE MOVING IT TO
THE NORTHEAST UNDER THE INFLUENCE OF A DEVELOPING LOW- TO MID-LEVEL
ANTICYCLONE SOUTHEAST OF THE PHILIPPINES. DUE TO CONTINUED DEEP
CONVECTION AND STRONG PERIPHERAL WINDS, THE POTENTIAL FOR THE
DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24
HOURS REMAINS GOOD. THIS SUPERSEDES REF A.
3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY
030300Z.//
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