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c789654|2011-9-21 22:11
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Tropical Storm 18W (Roke) Warning #41Final Warning
WTPN31 PGTW 211500
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL STORM 18W (ROKE) WARNING NR 041
DOWNGRADED FROM TYPHOON 18W
01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
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WARNING POSITION:
211200Z --- NEAR 37.0N 140.5E
MOVEMENT PAST SIX HOURS - 045 DEGREES AT 31 KTS
POSITION ACCURATE TO WITHIN 050 NM
POSITION BASED ON CENTER LOCATED BY A COMBINATION OF
SATELLITE AND RADAR
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
WIND RADII VALID OVER OPEN WATER ONLY
BECOMING EXTRATROPICAL
REPEAT POSIT: 37.0N 140.5E
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FORECASTS:
12 HRS, VALID AT:
220000Z --- 41.7N 145.7E
MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
WIND RADII VALID OVER OPEN WATER ONLY
EXTRATROPICAL
VECTOR TO 24 HR POSIT: 040 DEG/ 29 KTS
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24 HRS, VALID AT:
221200Z --- 46.0N 151.2E
MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
EXTRATROPICAL
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REMARKS:
211500Z POSITION NEAR 38.2N 141.8E.
TROPICAL STORM (TS) 18W (ROKE), LOCATED APPROXIMATELY 90 NM NORTH-
NORTHEAST OF TOKYO, JAPAN, HAS TRACKED NORTHEASTWARD AT 31 KNOTS
OVER THE PAST SIX HOURS. ANIMATED INFRARED SATELLITE IMAGERY
INDICATES RAPIDLY WEAKENING DEEP CONVECTION, SHEARED NORTHEAST OF
THE LOW-LEVEL CIRCULATION CENTER. JMA RADAR IMAGERY INDICATES THAT
THE BULK OF THE DEEP CONVECTION IS NOW LOCATED OVER THE NORTHEAST
QUADRANT AND ALSO SHOWS A WEAK FRONTAL SIGNATURE. THE CURRENT
POSITION IS BASED ON RADAR FIXES AND THE 211123Z METOP-A IMAGE. TS
18W IS UNDERGOING EXTRA-TROPICAL TRANSITION (ETT) AND IS FORECAST TO
COMPLETE ETT BY TAU 12 AS IT TRACKS RAPIDLY NORTHEASTWARD. MODEL
GUIDANCE REMAINS TIGHTLY CLUSTERED SO THIS FORECAST IS POSITIONED
SLIGHTLY FASTER AND TO THE RIGHT OF THE MODEL CONSENSUS. THIS IS THE
FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WARNING CENTER
(NAVMARFCSTCEN). THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF
REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 211200Z IS 22
FEET.//
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