Ever heard what is coldfront?
I have not known it myself until I watched a disaster filmed,Tassie style.

Wiki's definition:
A cold front is defined as the leading edge of a cooler mass of air, replacing (at ground level) a warmer mass of air.

The cooler, denser air wedges under the less-dense warmer air, lifting it. This upward motion causes lowered pressure along the cold front and can cause the formation of a narrow line of shower and thunderstorm when enough moisture is present. On weather maps, the surface position of the cold front is marked with the symbol of a blue line of triangles/spikes (pips) pointing in the direction of travel.



It can go as cold as -30c.
But in the film,it was set to an extraordinary case of -90c. creeps to the end.
Every single living life that the fog passes through would be frozen to death, causing an extremely severe frost bite.

The graphics in this natural disaster film wasn't really good,it was a low budget movie,
However, it has a good intention of telling the world to stop polluting the air because it does damages the ozone layer.

In the movie, coldfront was portrayed as a huge swamp of ice cold fog that moves from the direction of the sea rapidly hitting the city of Hobart and to various places of the world.
The air that moves after the first hit is much colder and stays around from days to weeks.
Leaving a cool temperature behind that slowly recedes through time.

Something interesting to dig in.
If interested,Look also : warmfront



Bestwishes,
Whiteglitters