Severe thunderstorms and strong winds set to hit Auckland to Waikato are arriving earlier than forecast.
The Metservice has issued a red thunderstorm warning across Auckland, Thames Coromandel, Kaipara, Auckland and Waikato.
Gusts are also expected to reach 120km/h in some parts.
RNZ is New Zealand's statutory civil defence lifeline radio broadcaster, providing vital information and updates as they come to hand.
The National Emergency Management Agency advises that in times of crisis or civil defence emergency a battery powered radio or a car radio remain essential lifelines if power is out and other forms of communication are unavailable.