A hurricane (飓风) is a powerful, rotating storm that forms over warm oceans near the equator．Hurricanes have strong, rotating winds, a huge amount of rain, low air【C1】______, thunder and lightning.
Hurricane winds【C2】______ in a counterclockwise spiral (螺旋状) around the calm, roughly【C3】______ center called the eye．in the eye,【C4】______ is roughly 20 to 30 miles wide, it is relatively calm and there is【C5】______ or no rain．The eye is the warmest part of the storm．Surrounding the eye is the eyewall, a wall of thunderclouds．The eyewall has the most rain and the strongest winds of the storm.【C6】______ rotating with wind speeds of at least 74 mph, a hurricane travels【C7】______ slowly across the ocean or land, usually【C8】______ about 20 to 25 mph．Long spiral rainbands (bands of rain clouds)【C9】______ to spiral inward to the eyewall．Hurricanes can be hundreds of miles【C10】______.
If this type of storm【C11】______ in the western Pacific Ocean, it is called a typhoon.
The exact location of a hurricane is easily【C12】______ by scientists, using satellite photos and radar.【C13】______ the direction, speed, and【C14】______ of a storm can change quickly,【C15】______ exactly where a storm will travel in the future is not easy.
Hurricanes can travel from the ocean to the coast and on to land,【C16】______ the wind, rain, and huge waves may cause extensive【C17】______．Generally, when a hurricane moves over land (or over cold ocean waters), the storm begins to【C18】______ and quickly【C19】______ because the storm is【C20】______ by warm water.
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