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93W→96W 風力達標 JMA:溫氣/美軍:副熱帶風暴

簽到天數: 588 天

[LV.9]以壇為家II

Meow|2017-7-29 22:41 | 顯示全部樓層
本帖最後由 Meow 於 2017-7-29 22:43 編輯

JTWC另編同時,JMA判定轉化溫帶氣旋並對北側發佈GW。
螢幕快照 2017-07-29 22.35.58.png
GALE WARNING.
EASTERLY TO SOUTHEASTERLY WINDS 30 TO 35 KNOTS PREVAILING OVER WATERS
BOUNDED BY 40N 160E 45N 165E 37N 178E 32N 170E 40N 160E.
...
LOW 1010 HPA AT 33N 170E NW 15 KT.
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簽到天數: 3291 天

[LV.Master]伴壇終老

t02436|2017-7-29 22:50 | 顯示全部樓層
JTWC評級Low
(2) AN AREA OF CONVECTION (INVEST 96W) HAS PERSISTED NEAR
32.7N 170.6E, APPROXIMATELY 677 NM NORTHWEST OF MIDWAY ATOLL.
ANIMATED INFRARED IMAGERY SHOWS WEAK AND DISORGANIZED CONVECTION
ASSOCIATED WITH A WELL DEFINED LOW LEVEL CIRCULATION CENTER (LLCC)
OBSERVED IN A 291002Z METOP-B ASCAT IMAGE. THE ASCAT IMAGE SHOWS A
REGION OF 30 TO 35 KNOT WINDS TO THE NORTHEAST OF THE LLCC. THE
SYSTEM IS CLASSIFIED AS SUBTROPICAL DUE TO THE PRESENCE OF AN UPPER-
LEVEL TROUGH OVERHEAD EXTENDING FROM A LOW PRESSURE SYSTEM TO THE
NORTHWEST. UPPER-LEVEL ANALYSIS REVEALS THAT THE SYSTEM IS LOCATED
IN A VERY HIGH SHEAR ENVIRONMENT (40-50 KNOT). MODELS INDICATE THAT
THE SYSTEM WILL MOVE IN A NORTHERLY DIRECTION OVER THE 48-72HRS AND
NOT TRANSITION INTO A TROPICAL SYSTEM. MAXIMUM SUSTAINED SURFACE
WINDS ARE ESTIMATED AT 30 TO 35 KNOTS. MINIMUM SEA LEVEL PRESSURE IS
ESTIMATED TO BE NEAR 1004 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A
SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS LOW.

abpwsair.jpg

點評

JTWC 取消評級,然後又速速撤編了...  發表於 2017-7-30 15:05
風切高達50kts.緯度已過30度.發展機會never(0%)  發表於 2017-7-30 06:43
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