The super typhoon "Xuanlannuo" hits, with a high probability of taking a turning path, and it is necessary to strengthen the prevention of secondary disasters
Release time：2023-02-07 05:56:52 source：korpimaankyynel.com author：Mineral products
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The super typhoon "Xuanlannuo" hits, with a high probability of taking a turning path, and it is necessary to strengthen the prevention of secondary disasters
From the perspective of the weather system, typhoons belong to "cyclones", which can be mainly divided into two categories: tropical cyclones and extratropical cyclones. Due to the extremely low air pressure in the center of the typhoon, the surrounding air converges toward the center and rotates under the action of the geostrophic deflection force, making the typhoon rotate counterclockwise in the northern hemisphere and clockwise in the southern hemisphere. Look, tropical cyclones mostly occur in the northern hemisphere. The No. 11 typhoon "Xuanlannuo" hit my country strongly. It is located in the east of the Eurasian continent and the west of the Pacific Ocean. East Asia and Southeast Asia, including my country, are the areas with the most frequent typhoon disasters in the world. The typhoon here is called "Northwest Pacific Ocean". Typhoons", and tropical cyclones that develop strongly in the Indian Ocean and Atlantic Ocean are called "hurricanes", and the United States is one of the countries most affected by hurricanes. Typhoons affecting my country are mostly generated in the tropical and subtropical oceans east of the Philippines. Due to the strong evaporation of seawater, a large amount of water vapor enters the atmosphere, and the turbulence of the trade winds forms typhoon embryos. Path distribution map of all typhoons (hurricanes) from 1985 to 2005. The latitude of the place where the No. 11 typhoon "Xuan Lannuo" was generated this year is relatively north, at 25.9° north latitude. 149.3°, about the same longitude as the eastern part of the island of Hokkaido, Japan. Compared with most typhoons, the location of the typhoon "Xuan Lannuo" is obviously more to the northeast and farther from the mainland. Therefore, the typhoon "Xuan Lannuo" was formed as early as August 28 and floated at sea for a week. After that, have not logged in yet. The typhoon "Xuanlannuo" generated in the Northwest Pacific Ocean will move westward as a whole. There are three main paths, namely the westward path, the northwest path and the turning path. The choice of typhoon path is affected by multiple factors, among which the location of the subtropical high pressure belt and the strength of cold and warm air have a lot to do with it. Generally speaking, typhoons in spring and early summer tend to follow the "westward path", passing through the Philippine Islands and entering the South my country Sea, affecting Hainan, Guangdong and Guangxi. The main typhoon paths that invade our country The typhoons in the summer season mostly follow the "northwest path", which is likely to pass through Taiwan Island in my country, and mostly land in the area from Fujian to Zhejiang, which will cause the greatest harm to our country. Typhoons in late summer and autumn often take a turning path. Typhoons mostly turn northward in the eastern waters of Taiwan Island, or turn northeast, enter the waters of the East my country Sea, and finally land on the Korean Peninsula or the Japanese archipelago. However, in recent years, due to the abnormal global climate, typhoons with very strange paths have often appeared. The path map of typhoon "Xuanlannuo" is very obvious. The path of typhoon "Xuanlannuo" is not normal. First of all, the location of its generation is remote. On September 2, there was a sharp turn to the north, and then a normal track of moving north-northwestward into the turning path. Although the possibility of typhoon "Xuanlannuo" landing in my country is relatively small, it is still necessary to strengthen precautions. The direct hazards of typhoons include strong winds, storm surges and heavy rains. At present, the maximum wind force near the center of typhoon "Xuanlannuo" reaches 16, which is a super typhoon level, and the eastern coast of my country will be affected by strong winds above 12. Strong winds will bring storm surges. Because the typhoon rotates counterclockwise, in the coastal areas north of the typhoon center at the same latitude, the wind direction blows from the ocean to the land, and a strong storm surge will occur, while the coastal areas south of the typhoon center at the same latitude, The wind blows from the land to the ocean with relatively small waves. The same is true for rainstorms. In the area north of the typhoon center at the same latitude, the wind blows from the ocean to the land, and a large amount of water vapor is transported from the ocean to the land, which is often more windy and rainy. Typhoon "Xuanlannuo" satellite cloud map In addition, we also need to guard against secondary disasters that may be caused by typhoon "Xuanlannuo". The first is that the heavy rain brought by typhoons may cause floods. Typhoons will cause short-term heavy precipitation. The precipitation in a few days can reach more than 100 mm, and in some areas, the precipitation may be as high as hundreds of millimeters, causing serious floods. disaster. Secondly, the heavy rain brought by the typhoon has caused the soil moisture in the mountainous areas to be oversaturated, and the risk of geological disasters such as landslides and debris flows has increased significantly. However, the arrival of this typhoon also announced the end of the continuous high temperature weather in my country, and the cool autumn is expected to come. Floods caused by typhoon and rain
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