1, "Lansha"
197 1 in August, 2008, a typhoon exceeding 18 occurred in the Taiwan Province Strait, which caused great damage to the coastal areas of Taiwan Province and Fujian. This typhoon, known as Typhoon Lansha, was one of the strongest typhoons in Taiwan's history at that time. Strong winds exceeding 18 destroyed a large number of houses, farmland and transportation facilities, causing hundreds of deaths and thousands of injuries.
2. "Haiyan"
In 20 13 1 1 month, the Philippines was hit by a typhoon exceeding 18, which was called "Haiyan". The typhoon accompanied by heavy rain and strong wind caused massive flash floods and mudslides, which caused serious damage to the Philippines. Typhoon Haiyan caused more than 6,000 deaths and more than 2,000 missing, making it one of the most destructive typhoons in Philippine history.
3. "Ilo"
1959 In September, Japan was hit by a typhoon exceeding 18, which was called "Ilo". Typhoon Ilo brought strong winds and heavy rains to eastern Japan, resulting in large-scale floods and soil erosion. The typhoon killed more than 5,000 people and injured more than 30,000 people, causing great losses to the Japanese economy.
4. "Katrina"
In August 2005, the United States was hit by a typhoon with a magnitude of over 18, which was called "Katrina". Hurricane Katrina brought great damage to the southern United States, especially Louisiana and Mississippi. Flooded cities, destroyed houses and lost lives have made Katrina one of the most devastating natural disasters in American history.
5. "Strong typhoon"
1September, 1999, China was hit by a typhoon exceeding 18, which was called a "strong typhoon". The strong typhoon has brought great damage to the southeast coastal areas of China, especially to Zhejiang, Fujian and Guangdong provinces. It destroyed tens of thousands of houses, causing more than 3,000 deaths and more than1000 missing.
The main causes of typhoon formation:
1, warm sea surface temperature: typhoon formation needs warm sea surface temperature, usually above 26 C. This warm seawater provides sufficient energy for the development of typhoons.
2. Water vapor supply: Water vapor on the sea surface is an important part of typhoon formation. When seawater evaporates, water vapor rises into the atmosphere, forming high humidity environmental conditions.
3. Strong updraft in the troposphere: In the typhoon formation area, there is usually a strong updraft, which makes a lot of warm and humid air move upward. These air currents can form strong convective clouds, which provide power for the development of typhoons.
4. Low vertical wind shear: Wind shear refers to the change of wind speed and direction between high altitude and low altitude. Lower vertical wind shear can help the development of typhoon, so that the center of typhoon can maintain a good vertical structure.
5. Rotor slot or disturbance: Rotor slot is a kind of longitudinal disturbance, which can guide the moist air in the atmosphere to move upward and promote the formation of typhoon. Other forms of disturbances, such as tropical waves or monsoon troughs, can also provide conditions for typhoon formation.