Making sense of the endless rain

It's only March, but parts of the east coast have had more rain already than they normally get in a year.  It's led to deadly and devastating floods, but why is it happening?  Today, Dr Chiara Holgate, a hydroclimatologist, explains the rare weather event that's brought some of wettest conditions ever recorded, and why there's still more to come.  Featured:  Dr Chiara Holgate, hydroclimatologist, Australian National University, Canberra