Gareth looks at the Queensland floods from a climate change point of view. The Australian Meteorological and Oceanographic Society say it is caused by the strongest La Nina event ever.
This BBC Weather webpage gives a graphical explanation of how the flows of the cold and warm currents change in a La Nina phase.
BBC Meteorologist Nina Ridge explains La Niña.
Good simple explanation. (Unlike the graphic on TV One News tonight where the moist air flow seemed to be twisting down onto western NZ, and completely missing Queensland!)
But is her name really Nina Ridge? It does appear too much of a coincidence.