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发表于 2014-12-4 05:21
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本帖最后由 yz0330 于 2014-12-4 05:22 编辑
WDPN31 PGTW 032100
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR SUPER TYPHOON 22W (HAGUPIT) WARNING NR
12//
RMKS/
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
SUPER TYPHOON (STY) 22W (HAGUPIT), LOCATED APPROXIMATELY 129 NM
NORTH-NORTHEAST OF KOROR, HAS TRACKED WEST-NORTHWESTWARD AT 17 KNOTS
OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED (EIR) SATELLITE
IMAGERY DEPICTS TIGHTLY-CURVED CONVECTIVE BANDING, ALSO SEEN IN A
031758Z SSMI MICROWAVE IMAGE. ADDITIONALLY, THE MOST RECENT WATER
VAPOR IMAGE DEPICTS A SIGNIFICANT EYE FEATURE. THE CURRENT POSITION
IS BASED ON THE EIR ANIMATION AND AFOREMENTIONED EYE WITH HIGH
CONFIDENCE. THE INITIAL INTENSITY IS ASSESSED AT 130 KNOTS DESPITE
DVORAK INTENSITY ESTIMATES LIMITED BY CONSTRAINTS FROM ALL REPORTING
AGENCIES. UPPER-LEVEL ANALYSIS INDICATES STY 22W REMAINS IN A
FAVORABLE ENVIRONMENT WITH LOW VERTICAL WIND SHEAR (VWS) AND
EXCELLENT POLEWARD OUTFLOW. STY HAGUPIT IS CURRENTLY TRACKING ALONG
THE SOUTHERN PERIPHERY OF THE SUBTROPICAL RIDGE (STR).
3. FORECAST REASONING.
A. NO CHANGE TO THE FORECAST PHILOSOPHY SINCE THE PREVIOUS
PROGNOSTIC REASONING MESSAGE.
B. STY HAGUPIT WILL MAINTAIN A WEST-NORTHWESTWARD TRAJECTORY
UNDER THE STEERING INFLUENCE OF THE STR. BY TAU 48, EXPECT THE SUPER
TYPHOON TO SLOW DOWN AS A SMALL MIDLATITUDE TROUGH DEEPENS ACROSS
THE EAST CHINA SEA AND CREATES A SMALL WEAKNESS IN THE STR. THE
SYSTEM WILL START TO TRACK SLIGHTLY TO THE NORTH AT THIS TIMEFRAME.
EXPECT FAVORABLE SEA SURFACE TEMPERATURES, ALONG WITH CONTINUALLY
FAVORABLE UPPER-LEVEL CONDITIONS TO ALLOW THE SYSTEM TO FURTHER
INTENSIFY, PEAKING AT 160 KTS BY TAU 48. DYNAMIC MODEL GUIDANCE IS
IN FAIRLY TIGHT AGREEMENT THROUGH TAU 72, WITH GOOD CONFIDENCE IN
THE FORECAST TRACK.
C. AFTER TAU 72, THERE IS A SIGNIFICANT BIFURCATION IN THE
MODELS. THE GFS AND COAMPS MODELS HAVE BEEN CONSISTENTLY SHOWING THE
SYSTEM MOVING POLEWARD THROUGH THE WEAKNESS IN THE STR THOUGH TAU
120 BEFORE SLIGHTLY TURNING BACK TO THE SOUTHWEST UNDER THE
NORTHEASTERLY SURGE THROUGH THE EAST CHINA SEA. OPPOSING THAT, THE
ECMF TRACKER HAS THE SYSTEM CONTINUING TO TRACK WEST INTO CENTRAL
PHILIPPINES INDICATING THAT THE WEAKNESS IN THE RIDGE IS NOT
PRONOUNCED ENOUGH TO SIGNIFICANTLY CHANGE THE TRACK OF HAGUPIT. THE
NAVGEM SOLUTION HAS BEEN SHIFTING BETWEEN THE TWO PREVIOUS
SOLUTIONS. THE JTWC FORECAST TRACK ENCOMPASSES ELEMENTS OF BOTH OF
THESE SCENARIOS. WITH THE SYSTEM INTENSIFYING WELL ABOVE MODEL
GUIDANCE, AS WELL AS INCREASING IN SIZE. THERE IS A HIGH PROBABILITY
THAT THE SYSTEM WILL START TO TURN POLEWARD INTO THE WEAKNESS IN THE
STR THOUGH TAU 96. HOWEVER, BEYOND THAT, THE ELONGATED STR IN
COMBINATION WITH THE LOWER-LEVEL NORTHEASTERLY SURGE WILL CONTRIBUTE
IN PUSHING THE SYSTEM ON A MORE WESTWARD TRACK INTO SOUTHERN LUZON.
OVERALL, THERE IS LOW CONFIDENCE IN THE EXTENDED FORECAST TRACK DUE
TO THE SIGNIFICANT BIFURCATION IN THE MODELS AND THE POSSIBILITY OF
AN ALTERNATE FORECAST SCENARIO, WITH THE SYSTEM EITHER SIGNIFICANTLY
RECURVING EAST OF THE PHILIPPINES OR TRACKING WESTWARD INTO THE
SOUTHERN PHILIPPINES.//
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