偏西风是风的一种方向。风向大于225度小于315度，是从正西左右45度角以内吹来的风。
闽南地区在偏西风下的酸雨出现率大，东北风下最小。
The frequency is large with the westerly wind but small with the northeasterly wind in southern Fujian.
任何穿越太平洋的风暴都回增加偏西风气流会使核离子穿越太平洋的时间加长。
Any storm systems moving across the Pacific would add kinks in the westerly flow that would make the path of a particle crossing the Pacific longer.
受地形影响，偏西风造成的焚风效应和高压后部偏南风造成的暖湿空气在山前积聚，分别加剧了两类高温的强度。
Affected by topography, they were strengthened by the foehn effect caused by west wind and the warm moisture accumulation before mountains caused by south wind.
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