The eye is relatively calm. As the eye of the low-pressure becomes smaller the wind speed increases. As the hurricane travels over warm tropical waters, moist hot air rises around the eye in a spiral fashion, due to the rotation of the earth. As this moist air rises it becomes cooler, therefore, it condenses and returns to the Earth as rain. Once a hurricane reaches land the source of warm moist air is extinguished and the hurricane dies.
Scientists attempt to decrease the intensity of hurricanes by creating a second eye.
This is accomplished by adding ice, salt, or iodine crystals. If the second eye combines with the original eye the diameter of the eye increases and the winds produced by the hurricane decrease. If strong winds spin the uprising moist air, a tornado or waterspout can form. In Utah tornadoes can and do occur on very hot, humid days. Cold air traveling over the mountains sinks as the hot air in the valleys rises.