WTIO31 PGTW 041500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 03B (OCKHI) WARNING NR 020//
RMKS/
1. TROPICAL CYCLONE 03B (OCKHI) WARNING NR 020
01 ACTIVE TROPICAL CYCLONE IN NORTH IO
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
---
WARNING POSITION:
041200Z --- NEAR 15.4N 68.9E
MOVEMENT PAST SIX HOURS - 020 DEGREES AT 06 KTS
POSITION ACCURATE TO WITHIN 025 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 035 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT
070 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
050 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 125 NM NORTHEAST QUADRANT
130 NM SOUTHEAST QUADRANT
085 NM SOUTHWEST QUADRANT
105 NM NORTHWEST QUADRANT
REPEAT POSIT: 15.4N 68.9E
---
FORECASTS:
12 HRS, VALID AT:
050000Z --- 16.8N 69.8E
MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 020 NM NORTHEAST QUADRANT
005 NM SOUTHEAST QUADRANT
010 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 120 NM NORTHEAST QUADRANT
115 NM SOUTHEAST QUADRANT
070 NM SOUTHWEST QUADRANT
080 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 030 DEG/ 11 KTS
---
24 HRS, VALID AT:
051200Z --- 18.7N 70.9E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 065 NM NORTHEAST QUADRANT
075 NM SOUTHEAST QUADRANT
045 NM SOUTHWEST QUADRANT
045 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 015 DEG/ 11 KTS
---
36 HRS, VALID AT:
060000Z --- 20.9N 71.6E
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT
060 NM SOUTHEAST QUADRANT
035 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 010 DEG/ 08 KTS
---
EXTENDED OUTLOOK:
48 HRS, VALID AT:
061200Z --- 22.5N 71.9E
MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND
---
REMARKS:
041500Z POSITION NEAR 15.7N 69.1E.
TROPICAL CYCLONE 03B (OCKHI), LOCATED APPROXIMATELY 1367 NM NORTH
OF DIEGO GARCIA, HAS TRACKED NORTH-NORTHEASTWARD AT 06 KNOTS OVER
THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY DEPICTS
FLARING CENTRAL CONVECTION BEING SHEARED TO THE NORTHEAST INTO THE
LEADING EDGE OF AN APPROACHING TROUGH FROM THE WEST. THERE IS HIGH
CONFIDENCE IN THE INITIAL POSITION WHICH IS BASED ON BOTH 37 AND 91
GHZ SSMIS IMAGES FROM 041122Z, SHOWING THE MICROWAVE EYE FEATURE
STRUGGLING TO KEEP TOGETHER WITH DEEP CONVECTION PRIMARILY CONFINED
TO THE WESTERN SEMICIRCLE AND DISPLACED NORTHEASTWARD. THE INITIAL
INTENSITY IS ASSESSED AT 65 KNOTS WHICH IS ON CURRENT INTENSITY
DVORAK ESTIMATES OF T4.0 (65 KNOTS) FROM DEMS AND PGTW, COMBINED
WITH A 041052Z SATCON ESTIMATE OF 67 KNOTS. UPPER-LEVEL ANALYSIS
SHOWS THE POINT SOURCE ALOFT STARTING TO BREAK DOWN AS THE ADVANCING
TROUGH INTERACTS WITH THE SYSTEM, AND VERTICAL WIND SHEAR HAS BEEN
STEADILY INCREASING OVER THE LAST SIX HOURS AS A RESULT. A DEEP-
LAYERED SUBTROPICAL RIDGE TO THE EAST IS STEERING TC 03B ON A COURSE
NORTHWESTWARD AND THIS TRACK WILL CONTINUE FOR THE REMAINDER OF THE
FORECAST PERIOD. INTERACTION WITH THE APPROACHING TROUGH WILL
CONTINUE TO INCREASE WIND SHEAR OVER THE NEXT 48 HOURS, AND IN
COMBINATION WITH DRY AIR ENTRAINMENT, WILL SEVERELY WEAKEN TC
03B WHILE OVER OPEN WATER. TC 03B IS EXPECTED TO DISSIPATE BELOW
TROPICAL CYCLONE STRENGTH JUST AFTER TAU 36, WITH THE REMNANT LOW
MAKING LANDFALL NEAR THE GULF OF KHAMBHAT AROUND TAU 48. DYNAMIC
MODEL GUIDANCE SHOWS GOOD AGREEMENT AS THE SYSTEM WEAKENS WITH ONLY
MINOR VARIATIONS IN THE EXACT LANDFALL LOCATION. OVERALL THERE IS
HIGH CONFIDENCE IN THE FORECAST TRACK. MAXIMUM SIGNIFICANT WAVE
HEIGHT AT 041200Z IS 20 FEET. NEXT WARNINGS AT 042100Z, 050300Z,
050900Z AND 051500Z.
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