As more flooding devastates parts of Australia Channel 4 News asks what is causing such unusual weather. Some experts believe the extreme conditions could last into the summer.

The volatile conditions in Australia are being blamed on a weather system called La Niña.
La Niña is a natural three to six year cycle which results in a cooling phase in the eastern Pacific just off the coast of Peru.
A drop in sea temperatures of only a degree or so can cause a dramatic change in weather patterns around the world.
This year the cooling phase has caused severe rain in parts of Australia which have suffered drought conditions for several years.