The team at WeatherWatch have provided a video update outlining how their forecasters track weather as storms approach New Zealand.

Cyclone Dovi will be moving in across the North Island on Sunday bringing severe weather on to both main islands of the country.

'In this special Saturday update we track - in detail - the rain and wind,” says WeatherWatch head analyst Philip Duncan.

'Plus we also take a look at the difficulties of forecasting a storm that is literally changing structure as it moves in.”

The WeatherWatch update on Cyclone Dovi can be viewed here