As the cycle of exchanging heat continues, a wind pattern is created that moves in a spiral fashion around a calm center, which is referred to as the 'hurricane eye'. Converging winds near the ocean surface collide with the developing storm, resulting in an increased circulation of warm, humid air and also enhancing the speed of wind. Presence of strong winds at high altitude pull the rising warm air away from the center, causing the storm to swirl in the typical cyclone pattern.
Read more at Buzzle: http://www.buzzle.com/articles/causes-and-effects-of-hurricanes.html