The warm air from thunderstorms and the deep, warm ocean surface (greater than 27 degrees) mix together and start to rise to create low pressure.
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A low pressure zone is formed near the surface of the water.
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Air continues to rise and the pressure starts to decrease at higher altitudes.
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Air around the low pressure zone flows fast in a spiral because as the air moves from high pressure to low pressure it deflects to the right, causing the air to spin.
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As the storm moves over the ocean, it picks up more warm moist air. The speed of its winds increases as more air is sucked in.
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It can take hours or even days to fully form a hurricane. The eye has calm winds which are surrounded by an eye wall of very fast winds.
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