What does Dawei mean?

The meaning of Dawei's name is open-minded, wealthy and auspicious, rising step by step, wholehearted, thoughtful, resourceful and wise.

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Severe Tropical Storm Dawi is the 10th storm to receive an international number in the 2023 Pacific typhoon season. The name Dawi was provided by Cambodia, which means elephant. This is the fifth time the name Dawi has been used.

Typhoon is a type of tropical cyclone. A tropical cyclone is a low-pressure vortex that occurs on the tropical or subtropical ocean. It is a powerful and deep "tropical weather system." China divides tropical cyclones in the northwest Pacific into six levels based on the maximum average wind strength near the bottom center. Those with wind strength of level 12 or above near the center are collectively called typhoons.

Typhoons often bring violent winds, heavy rains and storm surges, which not only bring disasters to mankind, but also bring benefits to mankind. Typhoons bring abundant freshwater resources to mankind, which is of great significance for improving freshwater supply and ecological environment. In addition, typhoons also maintain a relative balance of heat and cold in various parts of the world; the equatorial region has a hot climate. If typhoons had not dissipated this heat, the tropics would be hotter, the frigid zones would be colder, and the temperate zones would disappear from the earth.

Causes of formation

The formation of typhoons requires the following conditions: sea surface water temperature above 26.5°C; a certain initial disturbance of positive vorticity; vertical shear of ambient wind Get smaller; low pressure or cloud disturbance at least a few latitudes from the equator. Since people today do not fully understand the formation of typhoons, the above listed are only the necessary conditions for the formation of typhoons.

The initial stage of a typhoon is a tropical low pressure. It usually takes about 2 days to go from the initial low-pressure circulation to the maximum average wind force reaching level 8 near the center. Some may take three or four days, and some may only take a few hours. During the development stage, typhoons continue to absorb energy until the central air pressure reaches the minimum value and the wind speed reaches the maximum value. After a typhoon lands on land, it will quickly weaken and die due to the combined effects of ground friction and insufficient energy supply.

Typhoon structure

A typhoon is a deep low-pressure system with a very low central pressure. There is significant airflow in the lower levels that converges toward the center, and the top airflow mainly diverges outwards. If you cut the typhoon horizontally, you can see three distinct areas. From the center outward, they are: typhoon eye area, cloud wall area, and spiral rainband area.

Typhoon eye area: It is very strange. The wind there is very small, the weather is clear, and the average diameter is 40 kilometers. Sailors who are there humorously call the typhoon eye the paradise of typhoons.

Cloud wall area: The cloud wall area around the eye of a typhoon is tens of kilometers wide and more than ten kilometers high, also called the eye wall. Here the cloud wall is towering, the wind is howling, the rain is pouring, the sea water is churning, and the weather is the worst.

Spiral rainband area: Outside the cloud wall is the spiral rainband. There are several rain (cloud) belts here that converge in a spiral shape around the eye wall. The rainbands are tens to hundreds of kilometers wide. , thousands of kilometers long, showers will fall and strong winds will occur wherever the rain belt passes.