THE AREA OF CONVECTION (INVEST 96W) PREVIOUSLY LOCATED NEAR
13.7N 137.1E IS NOW LOCATED NEAR 13.9N 131.5E, APPROXIMATELY 525 NM EAST
OF LEGAZPI, PHILIPPINES. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY
(EIR) DEPICTS A BROAD CONSOLIDATING LOW-LEVEL CIRCULATION EMBEDDED
WITHIN PERSISTENT CONVECTION. ENVIRONMENTAL ANALYSIS REVEALS MARGINALLY
FAVORABLE CONDITIONS FOR DEVELOPMENT WITH MODERATE POLEWARD AND
EQUATORWARD OUTFLOW AND WARM SEA SURFACE TEMPERATURES (30-31 C), AS WELL
AS LOW NORTHWESTERLY VERTICAL WIND SHEAR (10-15 KTS). GLOBAL
DETERMINISTIC AND ENSEMBLE MODELS ARE IN FAIR AGREEMENT THAT INVEST 96W
WILL STEADILY CONSOLIDATE OVER THE NEXT 24-48 HOURS WHILE TRACKING
NORTHWESTWARD. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 18 TO 23
KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1007 MB. THE
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN
THE NEXT 24 HOURS IS UPGRADED TO MEDIUM.
WTPN21 PGTW 170300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE FORMATION ALERT (INVEST 96W)//
RMKS/
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN
140 NM EITHER SIDE OF A LINE FROM 13.8N 131.2E TO 15.3N 124.1E
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 18 TO 23 KNOTS. METSAT
IMAGERY AT 170000Z INDICATES THAT A CIRCULATION CENTER IS LOCATED
NEAR 13.8N 131.0E. THE SYSTEM IS MOVING WEST-SOUTHWESTWARD AT 05
KNOTS.
2. REMARKS: THE AREA OF CONVECTION (INVEST 96W) PREVIOUSLY LOCATED NEAR
13.9N 131.5E IS NOW LOCATED NEAR 13.8N 131.0E, APPROXIMATELY 489 NM EAST
OF LEGAZPI, PHILIPPINES. ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI)
DEPICTS A CONSOLIDATING LOW-LEVEL CIRCULATION CENTER (LLCC) EMBEDDED
WITHIN PERSISTENT CONVECTION. ENVIRONMENTAL ANALYSIS REVEALS MARGINALLY
FAVORABLE CONDITIONS FOR DEVELOPMENT WITH GOOD RADIAL OUTFLOW, WARM SEA
SURFACE TEMPERATURES (30-31 C), AND LOW NORTHWESTERLY VERTICAL WIND
SHEAR (10-15 KTS). GLOBAL DETERMINISTIC AND ENSEMBLE MODELS ARE IN GOOD
AGREEMENT THAT INVEST 96W WILL STEADILY CONSOLIDATE OVER THE NEXT 24
HOURS WHILE TRACKING NORTHWESTWARD. MAXIMUM SUSTAINED SURFACE WINDS ARE
ESTIMATED AT 18 TO 23 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO
BE NEAR 1005 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT
TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS HIGH.
3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY
180300Z.//
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