有两种类型的沙尘暴。首先,沙尘暴或“沙尘暴”,与天气尺度特性(如低压系统)。强风沿气团边界(即冷锋)创建的尘云,沙子,灰尘或其他微粒被湍流漩涡悬浮在地表附近和在空中。[![阿拉伯沙尘暴][1]][2]第二,臭名昭著的“哈布沙暴”与雷暴的冷池相关联。在美国西南部沙漠,夏季季风期间,大量的雷暴发展。这些雷暴产生雨幡状云或蒸发冷却雷雨下的大气。清凉的空气下沉到所谓的“冷池”。冷池通常加强雷雨衰变。冷池气团温度比环境空气传播像一个煎饼从雷雨下四面八方。 These cold pools can create wind gust fronts between 40 and 70mph. Similar to larger dust storms, sand, dust or other particulates become suspended in the air and create the wall of dust. [![cold pool][3]][4] [1]: http://i.stack.imgur.com/j94iy.jpg [2]: http://acd.ucar.edu/~drews/sandstorm/index_html_166874ec.jpg [3]: http://i.stack.imgur.com/HmSgd.jpg [4]: http://www.islandnet.com/~see/weather/graphics/photos0910/gustfront1.jpg