1. What are tropical cyclones?
Tropical depressions, tropical storms, hurricanes and typhoons are classified as tropical cyclones. A cyclone is characterized by sustained surface winds of high speeds that can exceed 300 km/h. Cyclones are usually formed in hot oceans, in areas of low pressure and can be very destructive due to the strength of their winds and the accompanying rainfall.
The sun’s rays heat the atmosphere in a non-uniform way, so the air temperature is different between one area and another. The hot air, when rising, leaves a void in the lower layers that are occupied by the cold air that comes down from the higher layers. If this process is maintained for a while, the wind speed increases until it forms a cyclone.