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发表于 2016-7-31 09:29
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WDPN31 PGTW 302100
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL DEPRESSION 06W (SIX) WARNING
NR 06//
RMKS//
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
TROPICAL STORM 06W (NIDA), LOCATED APPROXIMATELY 214 NM EAST-
NORTHEAST OF MANILA, PHILIPPINES, HAS TRACKED WEST-NORTHWESTWARD
AT 08 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED
IMAGERY DEPICTS DEEP FLARING CENTRAL CONVECTION FORMING A DENSE
OVERCAST OBSCURING THE LOW LEVEL CIRCULATION CENTER (LLCC). THE
INITIAL POSITION IS PLACED WITH HIGH CONFIDENCE BASED ON A 301729Z
AMSR2 37 GHZ IMAGE SHOWING IMPROVING CONVECTIVE BANDING WRAPPING
TIGHTLY INTO THE LLCC. OTHER RECENT MICROWAVE IMAGERY CONFIRMS THE
POSITION AND A 301501Z GMI 37 GHZ IMAGE SHOWS VERY LITTLE MOVEMENT
IN THE LAST 3 HOURS. THE SUBTROPICAL RIDGE TO THE EAST PREVIOUSLY
STEERING TS 06W TO THE NORTH-NORTHWEST IS TRANSITIONING TO A WELL
ESTABLISHED DEEP-LAYER RIDGE TO THE NORTH; RESPONSIBLE FOR THE
RECENT DEACCELERATION AND ERRATIC TRACK OBSERVED OVER THE LAST 24
HOURS. THE CURRENT INTENSITY IS ASSESSED AT 45 KNOTS AND IS BASED ON
BOTH AUTOMATED AND OBJECTIVE DVORAK FIXES FROM MULTIPLE AGENCIES.
THE ENVIRONMENT IS BECOMING INCREASINGLY FAVORABLE WITH WIND SHEAR
VALUES NEAR 5 TO 10 KNOTS, SSTS IN EXCESS OF 30 CELSIUS WITH
SUBSTANTIAL OCEANIC HEAT CONTENT, AND A NEAR ANTICYCLONE FORMING
OVER THE SYSTEM.
3. FORECAST REASONING.
A. NO CHANGE TO THE FORECAST PHILOSOPHY SINCE THE PREVIOUS
PROGNOSTIC REASONING MESSAGE.
B. TS 06W IS EXPECTED TO ACCELERATE NORTHWESTWARD IN THE NEXT 12
HOURS AS THE STEERING RIDGE TO THE NORTH REORIENTS. INTENSITY IS
EXPECTED TO REACH 60 KNOTS BEFORE MAKING LANDFALL OVER LUZON AROUND
TAU 18. THE SYSTEM IS EXPECTED TO MAINTAIN ITS STRUCTURE FAIRLY WELL
AS IT INTERACTS WITH THE COASTLINE OF LUZON AND RESURFACES OVER
WATER IN THE SOUTH CHINA SEA. ANOTHER PERIOD OF INTENSIFICATION IS
EXPECTED AS TS 06W CONTINUES ON ITS NORTHWESTWARD TRACK, PEAKING AT
75 KNOTS. LANDFALL IS EXPECTED AROUND TAU 60 NEAR HONG KONG.
C. IN THE EXTENDED TAUS, TD 06W SHOULD WEAKEN RAPIDLY AS IT
TRACKS WESTWARD INTO CHINA AND WILL DISSIPATE BY TAU 96. DYNAMIC
MODEL GUIDANCE IS IN VERY TIGHT AGREEMENT AND HAS BEEN OVER THE LAST
24 HOURS SHOWING A WEST-NORTHWESTWARD TRACK UNDER THE INFLUENCE OF
THE DEEP LAYERED RIDGE ANCHORED OVER CHINA, AND EACH SOLUTION SHOWING
LANDFALL NEAR HONG KONG. SLIGHT DIFFERENCES IN THE SHORT-TERM
FORECAST TRACK ARE DUE TO THE UNEXPECTED ERRATIC TRACK OBSERVED OVER
THE LAST 24 HOURS AS THE PRIMARY STEERING RIDGE TRANSITIONS. THE
FORECAST TRACK IS PLACED NEAR THE MULTI-MODEL CONSENSUS TRACK. DUE
TO THE TIGHT AGREEMENT OF MODEL SOLUTIONS, THERE IS HIGH CONFIDENCE
IN THE FORECAST TRACK.//
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