The combined super typhoon "Bravan" expands, and clouds may cover two Japans! Analysis: Merger with the American Whirlwind
On October 12, although Super Typhoon "Bravan" has moved further north, its eye is still very clear, rounded and deep, and the core cloud area is very compact and smooth, which means that it still has super typhoon strength. At 17:00, the Central Meteorological Observatory still declared a super typhoon with a wind speed of 68 m/s above 17 and above. Typhoon "Bravan" of such intensity has been going on for more than 24 hours. This year, the "Wind King" is still on par with Typhoon Mawa.
1. Super typhoon Bravan expands,
Recently, the development of super typhoon "Bravan" has attracted people's attention to meteorological phenomena. On October 12, Super Typhoon Bravan moved north, although it left the Pacific Warm Pool and reached relatively cool waters. However, due to the strong grounding of Bravan and the timely arrival of high-altitude jets, October 12 did not abate much. The clear eye of the typhoon lasted for two full days, and its staying power far exceeded that of Mawa.
Not only that, but its cloud system also extends northward. Judging by the cloud map, the entire typhoon will soon turn into a giant typhoon. The entire Western Pacific seems to be his stage. The area of the cloud system can accommodate two Japanese. The high-resolution visible satellite cloud image of Fengyun-4 on the afternoon of October 12 clearly shows that the cloud system of Typhoon Bravan is rapidly expanding, stretching 4,000 kilometers north and south.
2. The cloud can cover two Japans
A typhoon is a tropical cyclone, a system of low pressure caused by hot, humid air rising over the ocean. The energy source of typhoons is mainly latent heat released during evaporation and condensation on the sea surface. As a result, typhoons usually occur and persist in areas where sea temperatures exceed 26.5 degrees Celsius. During the movement of the typhoon, the Coriolis force generated by the earth's rotation deviates from the straight path and shows a certain curvature. In the Northern Hemisphere, typhoons usually move northwest or north; In the Southern Hemisphere, typhoons typically move southwest or south.
Bravan is Typhoon No. 15 that formed in the Northwest Pacific on October 7, 2023. Its origin is about 1000 km southeast of Guam, with a central pressure of 998 hPa and a maximum wind speed of 18 m/s. After the formation of Blavan , under the combined action of the subtropical high, it moved northwest at a speed of 20-25 kilometers per hour, and then gradually strengthened. In the early hours of October 9, Bravan was upgraded to a severe tropical storm; Typhoon Bulavan began to strengthen rapidly on October 10, and on October 11, Bulavan was upgraded to a super typhoon of category 17 or higher.
There are several main reasons why Blaven can increase rapidly: First, the sea temperature is unusually high. According to data released by the National Oceanic and Atmospheric Administration (NOAA), sea surface temperatures in the Pacific Northwest were generally 1 to 2 degrees Celsius above normal in October 2023, and even 3 to 4 degrees Celsius higher in some areas. Bravan provides abundant steam and energy.
Secondly, the subtropical high is unusually strong, which is why Bravan was once located south of the subtropical high, creating a relatively stable environment for it. At the same time, the influence of the western low-pressure trough also caused the subtropical high to weaken, providing Braven with a more favorable steering channel to move northeast. South of the subtropical high there is a stable environment and sufficient heat to support the continued strengthening of Bravan. The current inflection point, the high-altitude outflow environment brought by the western trough, allows it to form a fuller high. The external circulation helps maintain the intensity of Typhoon Bravan.
The Brawan cloud system is expanding rapidly. The cloud system spans 4,000 kilometers from north to south, which is the size of two Japans. This is because during intensification, Bravan constantly absorbs the surrounding water vapor and heat, causing the clouds to expand continuously. At the same time, Bravan was squeezed by the western trough and subtropical high, causing the clouds to become somewhat flattened and elongated. In addition, the drag of the westerly wind belt further pulled the cloud belt on the north side of Typhoon Bravan. , which eventually spans more than 4,000 kilometers from north to south.
3. Merger with the American Whirlwind
Typhoon Bravan then underwent a process of typhoon degradation. The Central Meteorological Observatory predicts that Typhoon Bravan will move northeastward and eventually transform into an extratropical cyclone in the North Pacific. Typhoon degradation refers to the process by which a typhoon gradually weakens and transforms into an extratropical cyclone during its movement. After moving to the North Pacific, Bravan merged into the western belt and became an extratropical cyclone, gradually losing its typhoon characteristics, but its impact cannot be ignored.
Currently, Typhoon Bravan is merging with an extratropical cyclone near Alaska in the North Pacific Ocean after a late transformation, impacting the western belt. Westerly winds are strong air circulation zones located in mid-latitudes that have a significant impact on the global climate. Typhoon Bulavin could develop into a very strong extratropical cyclone. When it merges with the western belt, it creates complex meteorological processes and can trigger extreme weather in localized areas. Oscillations in the westerly belt often lead to increased storms and precipitation, and even weather phenomena such as cold snaps.
Forecasted data show that Typhoon Bravan will have the greatest impact not on Asia, but on the other side of the Pacific and the United States and Canada. That's because Bravan, which is moving toward higher latitudes, is bringing enormous energy to the western belt, contributing to the first cold snap since autumn in the lower North America. Friends in North America should keep an eye out for next week's strong cold snap. However, due to the merger with extratropical cyclones, the area may still be affected by high winds and heavy rains. Therefore, the affected areas should pay close attention to the weather forecast and warning of the meteorological department, and take necessary preventive measures to ensure the safety of people's lives.