what is a typhoon

Residents of Mabolo, a town in the Philippines,
wade through a flooded highway in 1995,
days after Typhoon Angela ravaged the region.
A typhoon is a violent cyclone that occurs in the northwest Pacific Ocean. Typhoons feature heavy rains and winds that maintain speeds equal to or greater than 74 miles (119 kilometers) per hour. Similar storms that occur in other parts of the world are called tropical cyclones or hurricanes. The word typhoon comes from the Chinese term tai-fung, meaning great wind.

Typhoons occur most frequently in the late summer. They form over warm seas between about 5 and 20 degrees of latitude from the equator. They tend to move west, northwest, and eventually northeast at speeds of 10 to 20 miles (16 to 32 kilometers) per hour. Inside a typhoon, strong winds blow in a counterclockwise direction around an area of low pressure at the storm's center, which is called the eye. The eye usually measures about 10 to 40 miles (16 to 64 kilometers) in diameter. The strongest winds blow inside the eyewall, a ring of clouds that surrounds the eye. These winds often reach speeds of more than 110 miles (180 kilometers) per hour.

The heavy rains and strong winds of a typhoon can cause great loss of life and billions of dollars in property damage. As a typhoon approaches lands, its winds produce a rush of seawater called a storm surge that can devastate coastal areas.