西风带是位于副热带高压搭副极地低压之间(大约摸来拉南北纬30到60度之间)个行星风带。从副热带高压流向副极地低压个气流来拉地转偏向力作用下头,偏转成西风(北半球为西南风,南半球为西北风),为著讲西风带盛行西风。
西风带一般来讲风势比较强劲,海面风浪较大,带著赤道充沛个水气吹向大陆,使得迎风坡地带温和多雨。南半球陆地阻挡较少,个咾西风带风势比北半球更加强烈,降水也比较多。
盛行西风通常会得来拉中纬度南北方向来回摇摆,有常时摆幅过大还固定下来(塞杀),就会得造成极端天气。2010年夏天,西风来拉中纬度地区望北极方向大幅弯曲,来自赤道附近个暖空气长期隔绝拉西风通道南侧,以莫斯科为中心个广大地区就出现著史无前例个酷暑。
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