WTPN31 PGTW 202000
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL DEPRESSION 04W (LEEPI) WARNING NR 013
   02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   201800Z --- NEAR 31.1N 126.2E
     MOVEMENT PAST SIX HOURS - 020 DEGREES AT 14 KTS
     POSITION ACCURATE TO WITHIN 020 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   BECOMING EXTRATROPICAL
   REPEAT POSIT: 31.1N 126.2E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   210600Z --- 32.8N 130.6E
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
   VECTOR TO 24 HR POSIT: 080 DEG/ 30 KTS
    ---
   24 HRS, VALID AT:
   211800Z --- 33.5N 137.6E
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
   VECTOR TO 36 HR POSIT: 075 DEG/ 41 KTS
    ---
   36 HRS, VALID AT:
   220600Z --- 35.4N 147.2E
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
    ---
REMARKS:
202100Z POSITION NEAR 31.5N 127.3E.
TROPICAL DEPRESSION 04W (LEEPI), LOCATED APPROXIMATELY 215 NM WEST-
SOUTHWESTWARD OF SASEBO, JAPAN, HAS TRACKED NORTH-NORTHEASTWARD AT
14 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED
SATELLITE IMAGERY SHOWS THE LOW LEVEL CIRCULATION CENTER HAS STARTED
TO ELONGATE AS THE INTERACTION WITH THE BAROCLINIC ZONE (BAIU
BOUNDARY) POSITIONED NEAR CHEJU ISLAND AMPLIFIES. THE SYSTEM HAS
STARTED THE PROCESS OF EXTRA-TROPICAL TRANSITION (ETT) AND IS
EXPECTED TO COMPLETE THE ETT PROCESS IN THE NEXT 12 HOURS. THE
CURRENT FORECAST EXTENDS THE ET POSITIONS THROUGH TAU 36, AS MODEL
GUIDANCE INDICATES THE SYSTEM WILL INTENSIFY AS A COLD-CORE LOW
ALONG THE SOUTHERN COAST OF JAPAN INTO THE WESTERN PACIFIC. MODERATE
TO HIGH (25 TO 30 KNOTS) OF VERTICAL WIND SHEAR, IN ASSOCIATION WITH
INCREASED BAROCLINIC INTERACTION, AND DECREASING SEA SURFACE
TEMPERATURES HAVE LED TO A FASTER THAN EXPECTED TRANSITION OF THE
SYSTEM. DYNAMIC MODEL GUIDANCE REMAINS IN TIGHT AGREEMENT,
THEREFORE, THERE IS HIGH CONFIDENCE IN THE JTWC FORECAST TRACK. THIS
IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WRNCEN
PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF
REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 201800Z IS 12 FEET.
REFER TO TROPICAL DEPRESSION 05W (FIVE) WARNINGS (WTPN32 PGTW) FOR
SIX-HOURLY UPDATES.//