Spatial patterns of precipitation in central Canterbury, New Zealand
Mesoscale patterns o f daily precipitation around Christchurch, New Zealand, are examined for the years 1978 to 1981 by means of Principal Components Analysis. Five distinct patterns emerge, three of them dominant and consistent, and the other two varying in both occurrence and importance from year to year. Four of the patterns show a gradient either across or along the axis of the plains. The synoptic situation maps producing these patterns are examined and show some consistency for a given pattern, despite the wide variability of rain producing systems in the New Zealand area. The influence of Banks Peninsula on the rainfall pattern is also examined. The results produced should be of use as an aid to local forecasting.