Cyclonal defects usually occur in series called "the families of the cyclones". Usually, there is a belt of 3 or 4 cyclones in different stages. The cyclone has several stages of evolution. First, there is a stage of the origin of a cyclone. Second stage means that the cyclone is strengthening. At that moment, both the warm and cold front are very large. The system is moving very fast. The cold front is generally faster, which means that it runs down the warm one. This causes an occluded front. The weather is similar to both types of fronts. The third stage ends with filling of the area with air. The pressure rises. Stage four means that the signs of cyclonal weather disappear.