Cyclone (cyclone) refers to counterclockwise(cis) clock rotation of large vortex in the horizontal airflow of the north (south) hemisphere. At the same height, the cyclone center pressure than around low, also known as low pressure. It appears as a low pressure zone surrounded by contours of isoparametric contours on the contour map and a low value zone surrounded by contours of contours on the isopipe. Cyclone is similar to round or oval, size disparity. The horizontal scale of the small cyclone is a few hundred kilometers, a large up to three, four thousand kilometers, is a weather-scale weather system. The weather often violent changes,Cyclones are concerned by the most people and the first study of the weather system.
