Thunderstorm threat, 'extremely high' river flows, commuters at risk as 'significant weather' event moves towards NZ Newshub 12 hrs ago Scott Palmer 'Moisture anomaly' warning: Heavy rain, severe gales and flight disruptions feared as 'tap of tropical moisture' opens on NZ Replay Video UP NEXT A front is expected to bring "significant weather" as it moves across New Zealand Sunday night and Monday. Forecasters warn it could blast Auckland's commute tomorrow morning with heavy rain and strong northeasterlies, while bringing "extremely high river flows" to the South Island. "More heavy rain is predicted for the West Coast and the top of the South Island, including areas that recently experienced flooding," NIWA warns.