1977年行踪詭譎及強度異常之侵台颱風分析

吳宗堯 王時鼎

中央氣象局

空軍氣象中心

ABSTRACT

　　In 1977, Taiwan suffered several typhoons causing great damages ever recoded in the history. The report is a preliminary survey and diagnostic study on them. The followings may be considered as the findings and problems arised.
　　(1) The unusual tracks of typhoons Thelma and Vera, which approached to Taiwan from south and north tips respectively, were mostly influenced by the Central Mountain Range which stands as an internal boundary while Taiwan were embeded by the typhoon circulations.
　　(2) Owing to terrain protection and sheltering the unprecedented loses caused by these two typhoons were found only along landing Portions and the rapid decreases in intensity can be witressed from pressure profiles at the stations along the tracks.
　　(3) Small typhoon Amy limped over the Taiwan strait for more than three days. The governing factor may be deemed as that the outer circulation of the disturbance influenced by the terrain steered the inner core which, in most of the time, behaved as a huge convective cloud cluster, but not as a vortex with spiral bands shown in the radar echo pictures.