Physical Structure
There are three main parts of a hurricane: A strong tropical cyclone will harbor an area of sinking air at the center of circulation. If this area is strong enough, it can develop into an eye. It is the calm part of the storm. The part arround the eye is called the eyewall. Its a circle of strong thunderstorms that surrounds the eye. This part has the strongest winds and rains. The winds may blow 200 miles per hour. And finally we have "Rain Bands". These are the clouds that spin out and make the storm bigger.The distance from the hurricanes center of circulation to its outermost closed isobar (ROCI) can be less than two degrees of latitude (138 miles) if the hurricane is a very smale one. But the size of a hurricane can be even greater than 500 miles.
Size descriptions of tropical cyclones:
Very small/midget: less than 2 degrees latitude
Small: 2 to 3 degrees of latitude
Medium/Average: 3 to 6 degrees of latitude
Large: 6 to 8 degrees of latitude
Very large: over 8 degrees of latitude