If the last four or so years are anything to go on we are in for some shit.
Just in this summer we have had 4 storms come through NZ where we have over 250mm of rain in 12-24 hours. It was estimated that there was 380mm of rain fall on the mountain (large hill by international standards) here at home in just 8 hours. That is 1/6th of our yearly rain falling in 1/2 a day