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霧峰追風者|2018-8-15 09:20
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JTWC 18Z發布TCFA。
WTPN22 PGTW 142230
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE FORMATION ALERT//
REF/A/JOINT TYPHOON WRNCEN PEARL HARBOR HI/142200Z AUG 18//
AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT (WTPN21 PGTW
142200)//
RMKS/
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN
200 NM EITHER SIDE OF A LINE FROM 10.2N 147.6E TO 15.2N 139.8E
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 141800Z INDICATES THAT A CIRCULATION CENTER IS LOCATED
NEAR 10.9N 146.7E. THE SYSTEM IS MOVING NORTHWESTWARD AT 19
KNOTS.
2. REMARKS:
THE AREA OF CONVECTION (INVEST 99W) PREVIOUSLY LOCATED NEAR 9.5N
148.0E, IS NOW LOCATED NEAR 9.5N 148.0E, APPROXIMATELY 190 NM
SOUTHEAST OF ANDERSEN AFB, GUAM. ANIMATED MULTISPECTRAL SATELLITE
IMAGERY AND A 142047Z 91GHZ SSMIS MICROWAVE IMAGE DEPICT DEEPENING
CONVECTION ABOVE A CONSOLIDATING LOW LEVEL CIRCULATION CENTER, WITH
A BROAD REGION OF CONVECTION EXTENDING TO THE SOUTHWEST AND WRAPPING
INTO THE CENTER. VWS IS FAVORABLY LOW (5-10 KTS). A TUTT TO THE
NORTH IS AIDING DIVERGENCE ALOFT. SSTS ARE VERY WARM (27-29 CELSIUS)
IN THE MARIANAS REGION AND ARE CONDUCIVE TO DEVELOPMENT. GLOBAL
MODELS SHOW A COMPLICATED PICTURE, AS 99W INTERACTS WITH ANOTHER ILL-
DEFINED DISTURBANCE TO THE WEST. THE NEAR TERM TRACK IS GENERALLY
WESTWARD, THEN NORTHWARD THEREAFTER AS THE TWO SYSTEMS CONTINUE TO
INTERACT AS DIFFERENT MODELS DEPICT THE TWO DISTURBANCES EITHER
MERGING OR DEVELOPING INDEPENDENTLY. 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
152230Z.
4. SEE REF A FOR DETAILS ON A TROPICAL CYCLONE FORMATION ALERT
LOCATED NEAR 25.7N 127.5E.//
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