The extreme temperature of-1year1October 7th in Dong 'e County was-19 4 degrees. What is the cause of this cold wave?

On 202 1 17, extreme weather of minus 10 degrees occurred in Dong 'e County, Shandong Province. The reason for this cold wave is that, according to meteorologists, this cold air was directly transported from the North Pole, and the Arctic vortex that should have circled in the North Pole went south, and the real cold air mass affected us.

The cold wave affected most parts of China. Basically most provinces and cities have entered the refrigerator freezing mode. Even the southern cities such as Pearl River Delta and Shanghai entered the refrigerator freezing mode at 5 degrees in that year, and the tropical area of Hainan was around 10 degrees in that year, and the northern cities even entered the freezing mode.