西風槽

Multi tool use
Multi tool use

高空西風帶的高空冷心低氣壓出現槽線時,就是西風槽。西風槽是冷性和斜壓,槽中有強正渦,槽前地面常有隨溫帶氣旋的發展,槽後地面則形成反氣旋。西風槽在經過青藏高原會分開北支槽和南支槽,南支槽如果東移至離開高原,便會在雲南附近形成低壓區,這就是西南渦,西南渦通常會伸出低壓槽為華南帶來有雨的天氣。西風槽東移時也令副熱帶高氣壓東退,令熱帶氣旋轉向東北移動。





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