what is the typhoon?
A typhoon is a type of large storm system having a circular or spiral system of violent winds, typically hundreds of kilometers or miles in diameter. The winds spiral around a region of low atmospheric pressure.
For stronger typhoons, a characteristic structure called the "eye" forms when the maximum wind speeds exceed about 85 miles per hour, or 140 kilometers per hour. The eye is a region of clear air with no clouds, and is a few tens of kilometers in diameter.
The energy that powers typhoons comes from the evaporation of warm ocean water. The water vapor rises to the top of the typhoon along the sides of the eye, then condenses into clouds. Warmer ocean water produces more powerful typhoons, which can grow into "super typhoons".
(link : eyes of typhoon)
figure : shape of typhoon
typhoon / hurricane / cyclone?
The only difference of these three penomenons is the location of the storm occurs. Typhoons, Cyclones, and Hurricanes have all the same weather phenomenon. we just use different names for these storms in different places. In the Atlantic and Northeast Pacific, the term “hurricane” is used. The same type of disturbance in the Northwest Pacific is called a “typhoon” and “cyclones” occur in the South Pacific and Indian Ocean.
Furthermore, many people are confused about the difference between "tropical cyclone" and a "cyclone". A tropical cyclone is just a generic term used by meteorologists to describe a rotating, organized system of clouds and thunderstorms that originates over tropical or subtropical waters and has closed, low-level circulation. Once a tropical cyclone reaches maximum sustained winds of 74 miles per hour or higher, it is then classified as a hurricane, typhoon, or cyclone depending upon where the storm originates in the world.