1. TROPICAL CYCLONE 08P (FEHI) WARNING NR 008
01 ACTIVE TROPICAL CYCLONE IN SOUTHPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
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WARNING POSITION:
291800Z --- NEAR 23.4S 163.9E
MOVEMENT PAST SIX HOURS - 165 DEGREES AT 23 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 120 NM NORTHEAST QUADRANT
125 NM SOUTHEAST QUADRANT
105 NM SOUTHWEST QUADRANT
110 NM NORTHWEST QUADRANT
REPEAT POSIT: 23.4S 163.9E
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FORECASTS:
12 HRS, VALID AT:
300600Z --- 27.9S 164.0E
MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 105 NM NORTHEAST QUADRANT
255 NM SOUTHEAST QUADRANT
155 NM SOUTHWEST QUADRANT
010 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 180 DEG/ 23 KTS
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24 HRS, VALID AT:
301800Z --- 32.4S 164.2E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
BECOMING EXTRATROPICAL
RADIUS OF 034 KT WINDS - 205 NM NORTHEAST QUADRANT
260 NM SOUTHEAST QUADRANT
105 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 160 DEG/ 26 KTS
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36 HRS, VALID AT:
310600Z --- 37.2S 166.4E
MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
BECOMING EXTRATROPICAL
RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT
005 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
020 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 250 NM NORTHEAST QUADRANT
295 NM SOUTHEAST QUADRANT
165 NM SOUTHWEST QUADRANT
135 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 150 DEG/ 29 KTS
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EXTENDED OUTLOOK:
48 HRS, VALID AT:
311800Z --- 42.3S 170.1E
MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
EXTRATROPICAL
RADIUS OF 050 KT WINDS - 100 NM NORTHEAST QUADRANT
065 NM SOUTHEAST QUADRANT
035 NM SOUTHWEST QUADRANT
045 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 320 NM NORTHEAST QUADRANT
335 NM SOUTHEAST QUADRANT
275 NM SOUTHWEST QUADRANT
280 NM NORTHWEST QUADRANT
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REMARKS:
292100Z POSITION NEAR 24.5S 163.9E.
TROPICAL CYCLONE 08P (FEHI), LOCATED APPROXIMATELY 145 NM WEST-
SOUTHWEST OF NOUMEA, NEW CALEDONI, HAS TRACKED SOUTH-
SOUTHEASTWARD AT 23 KNOTS OVER THE PAST SIX HOURS. ANIMATED
INFRARED SATELLITE IMAGERY DEPICTS A PARTIALLY EXPOSED LOW LEVEL
CIRCULATION CENTER (LLCC) WITH DECREASING AND HIGHLY SHEARED DEEP
CONVECTIVE ACTIVITY. THE INITIAL POSITION IS PLACED WITH LOW
CONFIDENCE BASED ON THE EIR IMAGERY LOOP AND IS SUPPORTED BY
291839Z GPM 91 GHZ MICROWAVE IMAGE DEPICTING AN EXPOSED LLCC WITH
FLARING DEEP CONVECTION TO THE SOUTH AND EAST OF THE CENTER. THE
INITIAL INTENSITY HAS MAINTAINED AT 40 KNOTS AND IS BASED ON MULTI-
AGENCY DVORAK CURRENT INTENSITY ESTIMATES RANGING OF T2.0 (30
KNOTS) FROM KNES AND PGTW, HEDGED SLIGHTLY HIGHER BASED ON A
291235Z ASCAT SCATTEROMETER PASS INDICATING 40 KNOT WINDS IN THE
SOUTHERN HEMISPHERE OF THE SYSTEM, AN ADVANCED DVORAK TECHNIQUE
ESTIMATE OF T2.7 (39 KNOTS) AND A MULTI-SENSOR SATELLITE CONSENSUS
ESTIMATE OF 47 KNOTS. ENVIRONMENTAL ANALYSIS INDICATES THAT TC FEHI
HAS LIKELY COMPLETED TRANSITION TO A SUB-TROPICAL SYSTEM. TC FEHI
CURRENTLY LIES UNDER STRONG (35-40 KNOTS) VWS AND IS TRACKING OVER
ONLY MARGINAL (26-27 DEGREES C) SSTS. AN AMSU THERMAL CROSS SECTION
INDICATES A STRONG WARM ANOMALY IN THE NEAR-SURFACE LAYER, WITH A
WEAK WARM ANOMALY PRESENT IN THE UPPER LEVELS, SUPPORTING THE
ASSESSMENT THAT TC FEHI IS IN FACT SUB-TROPICAL. THE STRONG VWS IS
BEING OFFSET BY STRONG DIVERGENCE ALOFT WHICH IS HELPING TO
MAINTAIN THE INTENSITY AS THE SYSTEM MOVES RAPIDLY SOUTHWARD ALONG
THE WESTERN OF A SUBTROPICAL RIDGE (STR) TO THE EAST, AHEAD OF AN
APPROACHING MID-LATITUDE TROUGH. TC FEHI IS FORECAST TO CONTINUE
TRACKING RAPIDLY SOUTHWARD BEFORE TURNING MORE SOUTHEASTWARD BEYOND
TAU 24. TC FEHI IS FORECAST TO SLOWLY INTENSITY FROM TAU 24 TO 48,
AS IT BEGINS TO UNDERGO EXTRA TROPICAL TRANSITION (ETT) AS IT
INTERACTS WITH THE BAROCLINIC ZONE AHEAD OF THE APPROACHING MID-
LATITUDE TROUGH. THE SYSTEM IS EXPECTED TO BECOME COMPLETELY
EMBEDDED IN THE BAROCLINIC ZONE AND COMPLETE ETT BY TAU 48, AS A 50
KNOT SYSTEM. AVAILABLE NUMERICAL GUIDANCE IS IN TIGHT AGREEMENT
THROUGH THE FORECAST PERIOD, LENDING HIGH CONFIDENCE TO THE JTWC
TRACK FORECAST. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 291800Z IS 20
FEET. NEXT WARNINGS AT 300300Z, 300900Z, 301500Z AND 302100Z.
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