Natural calamity caused by difference in air pressure in atmosphere is called cyclone
It is a violently rotating windstorm and its formation depends on speed, direction of wind, temperature and humidity
Every year Japan is hit by tropical cyclones which cause heavy damage to lives, property etc
Most of them occur due to warm water currents as that existing in Pacific Ocean and since it lies South East of Japan the country is affected by a number of typhoons or cyclones in every season of the year