What happens when cold air meets a typhoon?

After autumn, cold air began to be active, but typhoons still appeared from time to time, and it was inevitable that the two would meet. Generally, typhoons that appear after September are called autumn typhoons. Statistically, typhoons are usually stronger in autumn. So, what happens when a typhoon meets cold air? Which is worse, typhoon or cold air? Let's get to know each other.

What happens when a typhoon meets cold air?

Typhoon meets cold air

There are three possible situations when a typhoon encounters cold air: 1, positive vorticity of cold front and cold surge effect of weak cold air, which can stimulate convection and promote cyclone enhancement; 2. Strong cold air can directly kill typhoons; 3. Cold air is related to the westerly trough. The westerly trough impacts the subtropical high, weakening its eastward movement, and the typhoon may turn.

The conclusion is that weak cold air may contribute to the strengthening of typhoon; Strong cold air may weaken the typhoon; Cold air may affect the typhoon path.

Typhoons often encounter cold air in autumn:

The first is the moving path to the south. This is because after entering autumn, the subtropical high affecting the tropical cyclone path began to retreat eastward and move southward, and its position gradually moved southward. Secondly, the strength is relatively strong, resulting in serious losses. For example, when the super typhoon "Lee Tae" landed in Hualien in 2005, the instantaneous wind force actually exceeded 17. It brought a 9-level gale 1 1 to the coast of Fujian, and landed again in Putian, Fujian in the afternoon, bringing heavy rainfall to Jiangxi and Anhui, with huge losses.

In addition, from the loss degree, the autumn typhoon has caused serious harm to China's agricultural production, and the solar term from "autumnal equinox" to "light snow" is the maturity of late rice heading and flowering in southern China. If there is a typhoon at this time, heavy rain will damage the leaves of crops, and the seeds will fall off and rot, or even be completely destroyed, resulting in serious yield reduction or no harvest. In 2005, the strong typhoon "David" landed on the coast of Wanning, Hainan in the early morning of September 26th. At that time, it was the mature season of rice harvest and banana harvest, which caused great losses to agriculture in Hainan Province.

In the context of global warming, extreme weather and climate events are becoming more and more intense, and the law of typhoon activity is more difficult to grasp, which will make the typhoon defense situation more complicated and severe, and we should not relax our vigilance because there are fewer typhoons in the early stage. Therefore, it is even more necessary to strengthen the defense against autumn typhoons in the future.