Large, Still, warm ocean area with temperature above 26.5 °C with low altitude winds are neededto form a tropical cyclone.Low latitude winds blowing from different directions.
Clouds form and rise to 10 km in the troposphere. The rising drops of air carry moisture high into the atmosphere, becomes really thick and heavy. Coriolis effect. Mature stage then the eye of the storm.
As the cyclone lands in the land it becomes weaker because if the cyclone does not have water it will be weaker.