Intense gusts reaching speeds of approximately 155km/h (96mph) have caused around 90,000 properties without power and forced officials to cancel over 100 air travel services, based on local media.
The winds are affecting the entire southern region and lower areas of the northern region, according to the weather forecasting body.
Officials in New Zealand have released rare high-level wind alerts - the highest alert level - in central regions such as Wellington and Canterbury.
People have been urged to remain inside, stay off roads, and get ready for additional electricity and network failures.
Broad Damage and Crisis Response
The electricity loss appears to be affecting households mainly in the southern region, though authorities report that power was being gradually reinstated.
Domestic outlets have indicated that in various locations structures have suffered roof damage, while utility poles and vegetation have been toppled by the gales.
In Wellington, a person was fatally injured after being hit by a falling limb at a frequent walking route on earlier this week.
Additionally in the city, a female was pushed toward moving cars on a street by a intensive burst, in a event that was filmed in a widely shared car camera footage.
Aircraft services in and out of the metropolis have been halted due to the weather, whereas some roads and libraries are not operating.
At the same time local leaders have announced a state of emergency, to support recovery activities.
Strike Action Alongside Extreme Weather
These intense gusts on Thursday occur while many of educators, medical professionals and government employees are participating in what has been called a "significant labor action", demanding better pay and working conditions.
Yet the severe conditions has forced them to modify some of their plans, with several external protests shifted to interior venues or called off.
Like conditions are affecting Australia, bringing a high-temperature event to the remote areas.
Agencies have announced burning restrictions for fear of forest fires.
