Why is the weather so strange this year?

The continuous rain and snow weather in the south this year is mainly due to the weak but frequent cold air force in the north and the strong warm and humid airflow in the southwest, so the static shear line (quasi-static stop front) is active over the south, bringing long-term precipitation (freezing rain and blizzard); La Nina is only part of the story. In addition, global warming does not mean that there is no low-temperature blizzard, but refers to the overall increase of global average temperature; At the same time, global warming disrupts the normal atmospheric circulation and will lead to more and stronger extreme weather and climate events!