What is that air vortex in the movie The Day After Tomorrow?

The air pressure in the center of the cold core system is high, and only anticyclone can be formed.

The air pressure in the cyclone center is low and the air pressure around it is high. The reason of cloud freezing: the airflow in the cyclone center rises and condenses when it is cold at a certain height (high altitude and low temperature, just like a strong typhoon will bring hail weather). The greater the intensity, the higher the airflow rise and the lower the temperature. On the other hand, film special effects, rendering effect and exaggeration enhance the appeal of the film.

For reference.