"The warm air is very active this year." So says Li Weijing, deputy director-general of China's National Climate Center, in reference to the massive snowstorm that has paralyzed his country.
The cause for the Chinese storms has been ascribed to the La Niña weather pattern, as forecast by the British Met (Meteorological) Office. La Niña is a cooling pattern that is influenced and enhanced by warming trends:
La Nina enhances Arctic weather systems and causes a cold winter in Asia, including in China. As warm and moisture air from the south meets cold air in the north under freezing temperatures, snow forms.