Cyclones are large scale atmospheric disturbances caused by low pressure systems that produce destructive winds. They are classified as extra tropical or tropical depending on their origin and characteristics. In India, cyclones are further classified based on wind strength, potential for storm surges, and exceptional rainfall. The document recommends having an emergency kit prepared with supplies like a flashlight, radio, first aid items, important documents, non-perishable food and water, and cash in case of a cyclone.