
WDPN34 PGTW 240900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL STORM 14W (WUKONG) WARNING NR
11//
RMKS//
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
TROPICAL STORM (TS) 14W (WUKONG), LOCATED APPROXIMATELY 437 NM
NORTHEAST OF MINAMI TORI SHIMA, JAPAN, HAS TRACKED NORTHWARD AT 08
KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE
IMAGERY (MSI) DEPICTS WEAK CONVECTIVE BANDING WRAPPING TIGHTLY INTO
A FULLY EXPOSED, WELL DEFINED LOW LEVEL CIRCULATION CENTER (LLCC),
WHICH SUPPORTS THE INITIAL POSITION WITH HIGH CONFIDENCE. THE
INITIAL INTENSITY IS ASSESSED AT 45 KNOTS BASED ON T3.0 (45 KNOTS)
DVORAK ESTIMATES FROM PGTW AND KNES. UPPER-LEVEL ANALYSIS INDICATES
WUKONG HAS MAINTAINED ROBUST POLEWARD OUTFLOW, ENHANCED BY AN UPPER
LOW TO THE NORTHWEST AND THE TUTT, AND IS LOCATED IN AN AREA OF LOW
(10-15 KNOTS) WESTERLY VERTICAL WIND SHEAR (VWS). HOWEVER, TOTAL
PRECIPITABLE WATER IMAGERY INDICATES THAT A RIBBON OF DRY AIR
INTRUDING INTO THE CENTER IS HINDERING SIGNIFICANT INTENSIFICATION.
TS 14W IS TRACKING ALONG THE SOUTHWESTERN EXTENT OF A SUBTROPICAL
RIDGE (STR) LOCATED TO THE NORTHEAST.
3. FORECAST REASONING.
A. THERE IS NO CHANGE TO THE FORECAST PHILOSOPHY SINCE THE
PREVIOUS PROGNOSTIC REASONING MESSAGE.
B. TS 14W IS FORECAST TO TRACK GENERALLY NORTH-NORTHWESTWARD OVER
THE DURATION OF THE FORECAST AS THE STEERING STR BUILDS TO THE EAST.
SEA SURFACE TEMPERATURES REMAIN GENERALLY FAVORABLE THROUGH TAU 24.
ADDITIONALLY, VWS AND OUTFLOW ARE EXPECTED TO REMAIN FAVORABLE WITH
GUIDANCE INDICATING SLIGHT INTENSIFICATION TO 50 KNOTS BY TAU 12.
HOWEVER, TS 14W IS FORECAST TO GRADUALLY WEAKEN BY TAU 36 AS IT
TRACKS OVER VERY COOL SST (23C) AND BEGINS TO MERGE WITH A BROAD
500MB LOW. BY TAU 48, THE SYSTEM WILL ENCOUNTER COLD SST NEAR 20C
AND WILL COMPLETE A WEAK EXTRA-TROPICAL TRANSITION AS IT REMAINS
EMBEDDED WITHIN THE BROAD 500MB LOW. DYNAMIC MODEL GUIDANCE REMAINS
IN STRONG AGREEMENT LENDING HIGH CONFIDENCE IN THE JTWC TRACK
FORECAST.//
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