: When a pressure center is formed in the atmosphere in a corner, warm water vapor from the surface of the water and dry cool air from the surface of the land rush horizontally towards the same depression center. The cold air is heavy so the warm air rises slowly over the cold air. The warm air coming from the surface of the water contains a lot of water vapor. লে When air rises above cool air, water vapor condenses inside it and causes rain. Such rainfall is called cyclonic rain. This rainfall is usually prolonged. Such rainfall is seen in different countries of Central Europe in winter.