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.
若东风随高度减弱的地区，基本气流的垂直切变为西风，则坏天气区在槽线以东。
After storm's entering westerly trough, the subtropical cyclone's reintensification was related to the high potential vortex's downward transmission from stratosphere.
风暴完全并入西风槽后，变性后的温带气旋再次加强与平流层高位涡的向下输送有关。
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.
不同的天气系统在不同季节对降水的贡献有所不同，其中西来槽类的降雨量和降雨日数均居首位，开展人工增雨催化作业机会最多；