The cause and harm of American hurricane. (geographical issues)

The formation of a hurricane requires three conditions: warm sea water; Humid air; The wind on the ocean surface can turn the air into an inward rotating airflow. In most storm structures, the air will become warmer and warmer, and will rise higher and higher, and eventually flow to the outside atmosphere.

If these upper winds are light, then this storm structure will be maintained and developed. The sky at the eye of the hurricane (that is, the center of the hurricane) is relatively calm. The most violent weather phenomenon occurs in the surrounding atmosphere near the eye of a hurricane, which is called the eye wall. At the top of the eye wall, most of the air flows out, which intensifies the upward movement of the atmosphere.

In the northern hemisphere, hurricanes rotate counterclockwise, while in the southern hemisphere, hurricanes rotate clockwise. Usually accompanied by strong winds and heavy rains, it seriously threatens the safety of people's lives and property and has a great impact on people's livelihood, agriculture and economy. It is a natural disaster with great influence and serious harm.