dom

JMA06Z判定轉化為溫帶氣旋

台風第8号(ニパルタック)
2021年07月28日15時50分発表
28日15時の実況
種別        温帯低気圧
大きさ        -
強さ        -
存在地域        秋田沖
中心位置        北緯40度0分(40.0度)
東経139度0分(139.0度)
進行方向、速さ        北西 30km/h(15kt)
中心気圧        998hPa

老農民版夜神月

JTWC發布Final Warning

WTPN33 PGTW 281500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL DEPRESSION 11W (NEPARTAK) WARNING NR 021//
RMKS/
1. TROPICAL DEPRESSION 11W (NEPARTAK) WARNING NR 021   
   02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   281200Z --- NEAR 40.9N 138.5E
     MOVEMENT PAST SIX HOURS - 300 DEGREES AT 15 KTS
     POSITION ACCURATE TO WITHIN 040 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
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   REPEAT POSIT: 40.9N 138.5E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   290000Z --- 41.4N 136.6E
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 24 HR POSIT: 265 DEG/ 05 KTS
    ---
   24 HRS, VALID AT:
   291200Z --- 41.3N 135.4E
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
281500Z POSITION NEAR 41.0N 138.0E.
28JUL21. TROPICAL DEPRESSION 11W (NEPARTAK), LOCATED APPROXIMATELY
127 NM WEST-NORTHWEST OF MISAWA, JAPAN, HAS TRACKED WEST-
NORTHWESTWARD AT 15 KNOTS OVER THE PAST SIX HOURS. 11W REMAINS
ASSESSED AS A SUBTROPICAL DEPRESSION. 11W HAS REEMERGED OVER WATER
AFTER QUICKLY TRAVERSING ACROSS NORTHERN HONSHU. HOWEVER THE OVERALL
CIRCULATION WAS SIGNIFICANTLY DEGRADED DUE TO TERRAIN INTERACTION.
THE INITIAL POSITION IS ASSESSED WITH HIGH CONFIDENCE BASED ON THE
EXPOSED LOW LEVEL CIRCULATION CENTER (LLCC) IN ANIMATED ENHANCED
INFRARED IMAGERY. THE INITIAL INTENSITY IS ASSESSED WITH HIGH
CONFIDENCE BASED ON A SERIES OF SCATTEROMETER PASSES NEAR THE
280900Z HOUR, WHICH CONFIRMED A SMALL AREA OF 25 KNOT WINDS CONFINED
TO THE NORTHERN SEMICIRCLE OF THE CIRCULATION. OVER THE NEXT 24
HOURS, THE DEVELOPMENT OF UPPER-LEVEL CONVERGENT FLOW, INCREASING
NORTHERLY VWS AND ENTRAINMENT OF MID-LEVEL DRY AIR, WILL SERVE TO
DISSIPATE 11W OVER THE NORTHERN SEA OF JAPAN. 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 281200Z
IS 10 FEET.//
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