Intense gales hitting velocities of as high as 155km/h (96mph) have resulted in nearly 90,000 households lacking electricity and compelled officials to halt over 100 flights, as reported by regional news sources.
These gusts are affecting the complete South Island and southern parts of the North Island, per the weather forecasting body.
The nation's agencies have issued rare high-level wind alerts - the highest alert level - in core zones such as Wellington and Canterbury.
Residents have been encouraged to remain inside, refrain from journeys, and get ready for additional power and communication outages.
Extensive Destruction and Crisis Response
The power cut appears to be affecting residences mainly in the southern region, though officials report that power was being restored progressively.
Regional news have stated that in certain areas structures have suffered roof damage, and power lines and trees have been toppled by the gales.
Across 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 oncoming traffic on a road by a powerful blast, in a moment that was filmed in a viral dashcam video.
Flights to and from the city have been suspended due to the gusts, while some roads and libraries are not operating.
At the same time Canterbury officials have issued a crisis declaration, to assist disaster response efforts.
Strike Action Alongside Extreme Conditions
These intense gusts on Thursday coincide with many of educators, medical professionals and government employees take part in what has been described as a "significant labor action", requesting improved salaries and workplace environments.
But the extreme weather has pressured them to alter some of their plans, with several external protests shifted to interior venues or called off.
Like conditions are affecting Australia, ushering in a period of extreme heat to the nation's interior regions.
Officials have issued fire bans for fear of wildfires.