westerly trough

基本解释

If the easterly is decreased with the height, so in the vertical shear of basic air flow is westerly one the bad weather is observed to the east of the trough lines.
若東風隨高度減弱的地區，基本氣流的垂直切變爲西風，則壞天氣區在槽線以東。
After storm's entering westerly trough, the subtropical cyclone's reintensification was related to the high potential vortex's downward transmission from stratosphere.
風暴完全竝入西風槽後，變性後的溫帶氣鏇再次加強與平流層高位渦的曏下輸送有關。
The contribution of various weather systems to precipitation varies in different seasons, and the rainfall and the number of rainy days induced by the westerly trough are the greatest.
不同的天氣系統在不同季節對降水的貢獻有所不同，其中西來槽類的降雨量和降雨日數均居首位，開展人工增雨催化作業機會最多；