What is a 1 in 100 year weather event? And why do they keep happening so often?
- Written by Andy Pitman, Director of the ARC Centre of Excellence for Climate System Science, UNSW
People living on the east coast of Australia have been experiencing a rare meteorological event. Record-breaking rainfall in some regions, and very heavy and sustained rainfall in others, has led to significant flooding.
In different places, this has been described as a one in 30, one in 50 or one in 100 year event. So, what does this mean?





