海高斯分析#14 - 颱風討論

By Elizabeth
at 2008-10-03T21:00
at 2008-10-03T21:00
Table of Contents
海高斯晚間在主雲團飄上海南島後
又再度呈現了切離甚至中心略為外露的現象
若以中低層風場及QUIKSCAT掃瞄來看
海高斯的低層中心還在海南島近海 並未登陸
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsir.html
http://manati.orbit.nesdis.noaa.gov/dataimages21/cur/zooms/WMBds56.png
但高層雲系卻大部份都集結在海南島上空
http://cimss.ssec.wisc.edu/tropic/adt/21WP.GIF
這樣的變化使得ADJT再次降低 , 海高斯又稍有減弱
不過若說他會就此掛了也不必然
首先海南島雖然有一定殺傷力 但跟台灣的高山群比還差得遠
第二颱風的中到低層氣流是吻合的 即目前是向北
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsdlm1.html
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsdlm2.html
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsdlm4.html
幾乎完全已趨於一致(垂直風切低)
唯獨
最高層仍吹著微弱的向西北的氣流
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsdlm6.html
這造成海高斯四周垂直風切再度加強
不過如果仔細想想
以海高斯的強度根本不可能發展到那麼高層
那麼這個現在所見的風切也許是一種"假垂直風切"
即雖然CIMSS所取之兩層間垂直風切大
但事實上是影響不到海高斯(因為他弱 發展高度低)
"愈弱的熱帶氣旋愈難捉摸" 還真不是說假的
我並不清楚雷州半島海南島一帶的地型效應
但若以高壓的趨勢變化來看
海高斯將會在短暫偏北後被往東北到東北東間重心拉回海上
生了又死 死了又生 又死 又生(當然某個魚骨變大眼蛙的是個例子啦)
這種颱風也算罕見了
再說一下為什麼比較關注低層中心的實際位置而非高層中心
因為如果真的嚴重切離到散了
低層中心重新往高處發展的機會>高層中心引動低層環流的機會
接著來看各主要單位今晚八時的定位
14時 17時 20時 過去三小時 過去六小時
CWB <18.4N 111.1E> <NO DATA> <19.4N 111.2E> [N/A] [北 19km/h]
JMA <18.4N 111.0E><18.9N 110.6E><19.4N 111.2E> [東偏東北東16km/h][北 19km/h]
JTWC <18.5N 111.0E> <NO DATA> <19.3N 110.9E> [N/A] [北 15km/h]
先到這
JMA又定回海上去了
繼續觀察
阿痕謹上
--
又再度呈現了切離甚至中心略為外露的現象
若以中低層風場及QUIKSCAT掃瞄來看
海高斯的低層中心還在海南島近海 並未登陸
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsir.html
http://manati.orbit.nesdis.noaa.gov/dataimages21/cur/zooms/WMBds56.png

http://cimss.ssec.wisc.edu/tropic/adt/21WP.GIF
不過若說他會就此掛了也不必然
首先海南島雖然有一定殺傷力 但跟台灣的高山群比還差得遠
第二颱風的中到低層氣流是吻合的 即目前是向北
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsdlm1.html
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsdlm2.html
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsdlm4.html
幾乎完全已趨於一致(垂直風切低)
唯獨
最高層仍吹著微弱的向西北的氣流
http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsdlm6.html
這造成海高斯四周垂直風切再度加強
不過如果仔細想想
以海高斯的強度根本不可能發展到那麼高層
那麼這個現在所見的風切也許是一種"假垂直風切"
即雖然CIMSS所取之兩層間垂直風切大
但事實上是影響不到海高斯(因為他弱 發展高度低)
"愈弱的熱帶氣旋愈難捉摸" 還真不是說假的
我並不清楚雷州半島海南島一帶的地型效應
但若以高壓的趨勢變化來看
海高斯將會在短暫偏北後被往東北到東北東間重心拉回海上
生了又死 死了又生 又死 又生(當然某個魚骨變大眼蛙的是個例子啦)
這種颱風也算罕見了
再說一下為什麼比較關注低層中心的實際位置而非高層中心
因為如果真的嚴重切離到散了
低層中心重新往高處發展的機會>高層中心引動低層環流的機會
接著來看各主要單位今晚八時的定位
14時 17時 20時 過去三小時 過去六小時
CWB <18.4N 111.1E> <NO DATA> <19.4N 111.2E> [N/A] [北 19km/h]
JMA <18.4N 111.0E><18.9N 110.6E><19.4N 111.2E> [東偏東北東16km/h][北 19km/h]
JTWC <18.5N 111.0E> <NO DATA> <19.3N 110.9E> [N/A] [北 15km/h]
先到這
JMA又定回海上去了
繼續觀察
阿痕謹上
--
Tags:
颱風
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