High temperature weather has lasted for 5 days, and a timely cooling rain is already on the road. It is expected that the low-pressure circulation after the weakening of "-day pigeon " on the 24th may enter our area from Guidong , driving away the high temperature with wind and rain. This is the first typhoon that directly affects Guangxi this year. Before "Tiange", there were 12 typhoons this year, and 6 typhoons landed or directly affected my country. Guangdong, Hainan, Fujian and Taiwan along the coast of South China have been baptized by typhoons, but Guangxi is in a corner. Who will control the direction of the typhoon? What determines the path of the typhoon?
As a weather system, typhoon will also be affected by large surrounding weather systems, such as sub-height, high-altitude trough, and double typhoon effect , and the guidance or game of these systems often determines its path.
When a typhoon is generated and approaches the secondary height or high altitude trough, its movement path is basically guided by the airflow of these large weather systems themselves. For example, in summer, the sub-high is generally located near 30° north latitude and swings north and south. The sub-high is strong and strong. Typhoons cannot cross it north, and most of them can only move along the eastward airflow on the south side of the sub-high to the westward direction.
If two typhoons are generated on the sea surface and are closer, their peripheral airflow will affect each other, causing each other to rotate, and the typhoon path will become quite complicated at this time.
What path will the typhoon take affect Guangxi?
The path of typhoons can be roughly divided into three categories.
Picture source: Central Meteorological Observatory
The first type of westward advancement is mostly typhoons generated before July. At this time, the sub-high is southward. The typhoon was generated from the ocean east of Philippines and headed westward. It passed through the South China Sea and finally landed in Hainan Island or northern Vietnam. It has a great impact on Guangxi, Guangdong, Hainan and other places. This year's No. 4 Typhoon Taras , No. 7 Typhoon Locke, and No. 8 Typhoon Sangka all took this path.
The second type of landing type, this type of typhoon is mostly generated from July to August, and the sub-high rises seasonally northward. The areas in South China and Jiangnan are located on the south side of the sub-high. The typhoon is guided by the peripheral airflow of the sub-high to move northwest, passing through the Taiwan Strait , landing along the coasts of Guangdong, Fujian and Zhejiang, and gradually weakening to low pressure. This type of typhoon will have a great impact on the southeast coast and will have the greatest impact on our country. Typhoon Miaobai of this year, Typhoon No. 2, Typhoon No. 9, Typhoon No. 1, and Typhoon No. 10, are all of this type.
The third type of parabolic type. After this type of typhoon is generated, it first moves in the northwest direction. When it is close to the eastern coast of my country, it does not land but turns to the northeast direction and moves toward the vicinity of Japan. The path is parabolic. It has no direct impact on our mainland. Typhoon Plum Blossoms of this year, Typhoon Plum Blossoms of No. 1, Typhoon Plum Blossoms of No. 3, Typhoon 12, and Typhoon Banyan Trees of No. 1 are all this path.
13 Typhoon "Tiange" took the "landing-type" path
21-22, and the sub-high split into two parts: the sub-high mainland and the sub-high North Pacific high pressure, with similar forces. "Tiange" is located between the two highs and is involved in a wrestling force. The typhoon path swings slightly, and in the end, the mainland's deputy high is slightly better. "Tiange" is suppressed by the northerly airflow and has to temporarily move from west to southwestward.
23 During the day of the day, the mainland sub-high rose northward and retreated eastward, and the northward airflow suppressed and decreased. The North Pacific sub-high again exerted force, and the southeast airflow was significantly strengthened. The "Heavenly Ge" took advantage of this southeast wind and moved quickly to the northwest direction and landed in Guangdong.
htmlOn 24, "Tian Ge" continued to travel westward, entering eastern Guangxi from western Guangdong, affecting Guangxi.
Picture source: China Meteorological Channel
Affected by "Heavenly Ge", there will be a heavy rainfall process from east to west from the 23rd to the 25th, and there may be heavy rainstorms in some places. The northeast region with severe flood disasters in the early stage will usher in a heavy rainfall process. The public is also asked to pay more attention to weather forecasts and early warnings, and pay attention to prevent possible secondary disasters such as urban waterlogging, mountain torrents, landslides and other possible occurrences. (Text/Wu Han)
