Typhoon red warning signal is an early warning signal made by meteorological department through meteorological monitoring before the arrival of typhoon. The standard is that within 6 hours, it may or has been affected by tropical cyclones, and the average wind power along the coast or land reaches more than 12, or the gust reaches more than 14 and may continue, so as to remind people to avoid typhoons and industrial and commercial enterprises to minimize the losses caused by typhoons. Typhoon red warning signal is the highest level of typhoon warning signal.
Shenzhen Meteorological Observatory upgraded the orange warning signal of typhoon in the whole city to red on September 1 day 14. Typhoon Sura may seriously affect Shenzhen at close range. Meteorological monitoring showed that the super typhoon Sura was located on the sea surface about 1 60 km southeast of Shenzhen on September/day/day 14, and the maximum wind force near the center was 17.
Typhoon characteristics
The circulation is complex, with many systems and small volume, which makes it difficult to predict the track of Typhoon Sura, and the circulation situation around Typhoon Sura is complicated. There are many possibilities for a typhoon to move along the direction of the airflow that guides it. At this time, there are many eddies around Sura, and a change in the subtropical high situation in the future will also affect the moving direction of the typhoon. With the strengthening of cold air activity in autumn, the westerly trough will also affect the position of typhoon Sura.
Secondly, Typhoon Sura was also affected by Typhoon Anemone and tropical depression on the east side of Guam. Two adjacent vortices may have a direct impact on each other's paths within a suitable distance, which is called Fujiwara effect, that is, two typhoons will rotate counterclockwise around the midpoint of their connecting line, which will directly affect their positions.