Is extreme rain and snow in many countries related?

Song Wenling, an expert from the Climate Prediction Office of the National Climate Center, analyzed the specific causes of the strongest rain and snow weather in China recently.

Song Wenling said that the recent warm and humid air flow from the Bay of Bengal is very strong. Warm and humid air flows into China from southwest, where they meet with weak cold air from north to south. The continuous wet and cold state promotes the formation of a wide range of rain and snow weather in the central and eastern regions, and the daily snowfall in some areas exceeds the local monthly extreme value. From the time period, the average cold air is active in June 5438+ 10, and it is prone to rain and snow if there are abundant water vapor conditions.

So, is there any connection between the recent snowstorms in many countries in the northern hemisphere and the extremely cold weather? Song Wenling explained that generally speaking, the influence system of winter rain and snow weather in different parts of the northern hemisphere has strong regional characteristics.

"The weather systems that affect China are mainly members of the East Asian winter monsoon, such as the Siberian high, the western Pacific subtropical high and the southern branch trough. The activities of these systems are mainly concentrated in Asia. On the other hand, atmospheric movement is not isolated. For example, the location of the polar vortex center in the northern hemisphere will have different effects on Asia or Europe and the United States. " Song Wenling said.