The blue arrows show how cool, dry air sinks in the eye and between the bands of clouds. The small red arrows show warm, moist air rising from the ocean's surface, and forming clouds in bands around the eye. If you could slice into a tropical cyclone, it would look something like this. Higher pressure air from above flows down into the eye. It is very calm and clear in the eye, with very low air pressure. This difference is because of Earth's rotation on its axis.Īs the storm system rotates faster and faster, an eye forms in the center. Storms south of the equator spin clockwise. Storms that form north of the equator spin counterclockwise. The whole system of clouds and wind spins and grows, fed by the ocean's heat and water evaporating from the surface. As the warmed, moist air rises and cools off, the water in the air forms clouds.
As the warm air continues to rise, the surrounding air swirls in to take its place. Then that "new" air becomes warm and moist and rises, too. A tropical cyclone has so many of these, they form huge, circular bands.Īir from surrounding areas with higher air pressure pushes in to the low pressure area.
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