1, "Lansha"
197 1 In August, a typhoon with a magnitude of 18 occurred in the Taiwan Province Strait, which caused great losses to Taiwan Province Province and Fujian coastal areas. 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 traffic facilities, causing hundreds of deaths and thousands of injuries.
2. Haiyan
On October 20 13, 1 1 year 10, the Philippines was hit by a typhoon of magnitude above 18, which was called Haiyan. Typhoon accompanied by heavy rain and strong winds triggered large-scale flash floods and mudslides, causing serious losses to the Philippines. Typhoon Haiyan, one of the most destructive typhoons in Philippine history, killed more than 6,000 people and left more than 2,000 missing.
3. "ILO"
1September 1959, Japan was hit by a typhoon of magnitude above 18, which was called "Ilo". Typhoon Ilo brought strong winds and heavy rains to eastern Japan, causing massive floods and soil erosion. The typhoon killed more than 5,000 people and injured more than 30,000 people, causing huge losses to the Japanese economy.
4.katrina
In August 2005, the United States was hit by a typhoon with a magnitude exceeding 18, which was called "Katrina". Hurricane Katrina brought great losses 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 with a magnitude 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 1000 missing.
The main causes of typhoon formation:
1, Warm sea surface temperature: The formation of typhoons requires a warm sea surface temperature, usually above 26℃, which 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 a high humidity environment.
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 and 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. The lower vertical wind shear is helpful to the development of typhoon and keeps the typhoon center in 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 the formation of typhoons.