Blizzard occurred in the north of Hengyang, Hunan 18 counties and cities. What is the maximum snow depth?

Heavy snow fell in the north of Hengyang, Hunan Province. The depth of snow in 9 counties and cities is 5 cm, and the thickness of snow in 2 counties and cities is 8 cm.

According to experts' analysis, the La Nina incident and the water-rich south are the keys to the snowstorm. 1October 22nd, 10, 202 1, an official of the National Climate Center said at the press conference? Since July, the SST in the equatorial, Middle East and Pacific Ocean has been declining continuously, and it is expected to enter the state of La Ni? a phenomenon in June at 5438+ 10, and form a weak to moderate La Ni? a phenomenon in winter. ? Therefore, many low-temperature rain and snow events in Hunan this year are closely related to the current La Nina event, and the atmospheric circulation continues to respond to the La Nina event this winter. Due to the complex air-sea interaction, La Nina's cold air activities are frequent and intense in winter, especially in the late winter. In addition, the winter pressure field in East Asia is high in the north and low in the south, which is conducive to the cold air going south, resulting in low temperature. In addition, the water vapor is abundant, that is to say, the Qinghai-Tibet Plateau, the southern branch of the trough of low pressure, is active, and the powerful southwest airflow trough in front transports a large amount of water vapor to the south of China and climbs the cold air cushion. The constant confrontation and intersection of cold and warm air currents has formed a cooling and snowfall weather. ?

Little knowledge: La Nina phenomenon is the abnormal cooling of seawater in the eastern and central Pacific Ocean. The trade winds from the southeast blow warm seawater to the western Pacific Ocean, which makes the sea level in the west rise by nearly 60 cm compared with that in the east. In the west, the sea water temperature rises, the air pressure drops, and humid air gathers, forming typhoons and tropical storms. The rising sea water in the east cools the sea water in the east. La Nina is the antonym of El Nino. With the disappearance of El Nino, the arrival of La Nina has changed the weather and climate disasters in many parts of the world. Generally speaking, La Nina is not very mild, and its impact on the climate is roughly opposite to that of El Ni? o in intensity and influence, but its arrival will also bring disasters to many parts of the world. ?

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