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发表于 2016-7-7 20:17
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WDPN31 PGTW 070900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR SUPER TYPHOON 02W (NEPARTAK)
WARNING NR 18//
RMKS//
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
SUPER TYPHOON 02W (NEPARTAK), LOCATED APPROXIMATELY 235 NM SOUTH-
SOUTHEAST OF TAIPEI, TAIWAN, HAS TRACKED WEST-NORTHWESTWARD AT 09
KNOTS OVER THE PAST SIX HOURS. THE CURRENT POSITION IS BASED, WITH
HIGH CONFIDENCE, ON SATELLITE EYE FIXES FROM PGTW AND RJTD. THE
INTENSITY OF 145 KNOTS IS CONSISTENT WITH SUBJECTIVE DVORAK
SATELLITE INTENSITY ESTIMATES FROM MULTIPLE REPORTING AGENCIES. STY
02W HAS NEARLY MAINTAINED INTENSITY OVER THE PAST SIX HOURS UNDER
THE INFLUENCE OF STRONG DIFFLUENCE ALOFT AND PASSAGE OVER A VERY
WARM SEA SURFACE. STORM MOTION HAS SLOWED SLIGHTLY AS THE SYSTEM
CONTINUES TO TRACK TOWARD TAIWAN UNDER THE INFLUENCE OF A DEEP-
LAYERED SUBTROPICAL STEERING RIDGE.
3. FORECAST REASONING.
A. THE TRACK FORECAST HAS BEEN SHIFTED SLIGHTLY TO THE SOUTH AND
WEST BASED ON CURRENT NUMERICAL MODEL FORECAST GUIDANCE AND ANALYSIS
OF THE SYNOPTIC STEERING PATTERN. FORECAST TRACK SPEEDS HAVE ALSO
BEEN REDUCED, PARTICULARLY IN THE TAU 48 TO TAU 72 PERIOD WHEN THE
SYSTEM IS EXPECTED TO TRACK INLAND THROUGH SOUTHEASTERN CHINA.
B. STY 02W WILL CONTINUE TRACKING GENERALLY WEST-NORTHWESTWARD
ALONG THE PERIPHERY OF THE SUBTROPICAL RIDGE TO THE NORTHEAST UNTIL
IT MAKES LANDFALL IN SOUTH CENTRAL TAIWAN WITHIN THE NEXT 18 TO 24
HOURS. SOME NEAR-TERM WEAKENING IS EXPECTED AS THE WESTERN PORTION
OF THE STORM CIRCULATION BEGINS TO INTERACT WITH LAND, BUT THE
SYSTEM WILL REMAIN A VERY INTENSE TYPHOON OR SUPER TYPHOON UNTIL IT
MAKES LANDFALL. STY 02W WILL WEAKEN CONSIDERABLY AS IT CROSSES THE
HIGH TERRAIN OF TAIWAN, BUT IT IS EXPECTED TO REORGANIZE AND
MAINTAIN TROPICAL STORM OR MINIMAL TYPHOON INTENSITY AS IT CROSSES
THE TAIWAN STRAIT. BY TAU 48, STY 02W WILL MOVE INTO SOUTHEASTERN
CHINA, AND WILL DISSIPATE BY TAU 72. NUMERICAL MODEL GUIDANCE IS IN
GOOD AGREEMENT THROUGH THE FORECAST PERIOD, LENDING HIGH CONFIDENCE
TO THE JTWC TRACK FORECAST.//
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