In the past two days, when the rainy weather in many parts of the central and eastern parts of the mainland has weakened, and even many places have been sunny, on the Qinghai-Tibet Plateau in the western part of the mainland, heavy snowfall has begun to fall online. On the evening of February 4, from the Fengyun-4 satellite cloud map, a large thick cloud was covering Tibet and Qinghai, and there was more than twice the standard of 24-hour heavy snow in Nielamu in the southern border area of Tibet, which was a large amount of warm and humid air from the northern Indian Ocean transporting to the north, crashing into the Himalayas, and even fierce water vapor rushed onto the Qinghai-Tibet Plateau, making it snow deep in the plateau.
After a large amount of rain and snow go up the mountain, the rain and snow will "go down the mountain" again, and a wide range of rain and snow weather in the central and eastern parts of the mainland will occur - this is the ghost of the South Branch in the south branch of the west wind. In recent days, a strong and deep south branch trough has formed in the south branch of the south branch of the south branch of the south branch south of the tibetan plateau, and the southwest air flow in front of the south branch trough has induced a large amount of warm and wet water vapor to the north, which has led to heavy rain and snow in some areas.
The south branch west wind is part of the west wind belt - the west wind belt in the northern hemisphere surrounds the whole earth in the mid-latitude region, but after encountering the "roof of the world" Qinghai-Tibet Plateau, because it is too high to pass, it has to go around, and finally forks in the Qinghai-Tibet Plateau into two branches, the north one is called the North Branch West Wind, the south one is called the South Branch West Wind, and the low-pressure groove formed in the south side of the West Wind Belt is called the South Branch Trough. The south branch trough will guide a large amount of water vapor north to the mainland, is the mainland's "winter trough", whether it is the heavy snow in tibet on the mainland or the recent continuous wet and cold rain and snow in the south, it is closely related to the recent formation of the south branch.
The west wind belt runs from west to east, and the south branch west wind is no exception, and the south branch trough will continue to move east in the south branch west wind, after inducing a large amount of water vapor to rush onto the Qinghai-Tibet Plateau, the eastward moving south branch trough will make the water vapor east of the Qinghai-Tibet Plateau increase rapidly. The forecast of the Central Meteorological Observatory has pointed out that from the evening of February 5, the rain and snow weather in the eastern part of the Mainland Qinghai-Tibet Plateau will increase again, and there may be snowfall again in the eastern part of the northwest region.
This time, the southern part of the continent may still be the focus of rain and snow. In particular, from February 6 to February 7, the Central Meteorological Observatory predicted that there will be a wide range of snowfall areas in the middle and lower reaches of the Yangtze River on the mainland, especially in Hubei, Hunan, Anhui, Jiangsu and Zhejiang, which may be large to blizzard areas, and southern Anhui and western Zhejiang are likely to become heavy snowfall centers. Because the warm and humid water vapor is very abundant, there will be a larger area of moderate to heavy rain south of the Yangtze River. According to existing forecasts, there may be more snow than last time. After a brief turnaround in many parts of the south, this widespread rain and snow weather will once again plunge most of the south into boundless wet and cold.