Intense winds hitting velocities of approximately 155km/h (96mph) have resulted in around 90,000 households experiencing outages and compelled authorities to halt more than 100 flights, according to local media.
The winds are affecting the entire South Island and lower areas of the North Island, according to the weather forecasting body.
The nation's agencies have issued infrequent severe gust advisories - the highest alert level - in key areas including Canterbury and Wellington.
People have been encouraged to stay indoors, refrain from journeys, and get ready for more electricity and network failures.
Widespread Destruction and Emergency Measures
This outage is primarily influencing residences mainly in the South Island, though agencies state that the electricity supply was being restored progressively.
Regional news have reported that in various locations structures have suffered roof damage, whereas utility poles and vegetation have been toppled by the winds.
In Wellington, a individual was fatally injured after being impacted by a tree branch at a frequent walking route on earlier this week.
Also in the capital, a individual was blown onto oncoming traffic on a road by a intensive burst, in a moment that was filmed in a viral dashcam video.
Air travel to and from the city have been halted due to the winds, while various routes and public facilities are also closed.
Meanwhile local leaders have declared a crisis declaration, to support emergency management operations.
Work Stoppages Amid Extreme Conditions
These intense gusts on Thursday coincide with numerous of teachers, doctors and other public workers are engaged in what has been described as a "mega strike", demanding higher wages and enhanced employment terms.
However the extreme weather has forced them to alter some of their plans, with several external protests shifted to interior venues or called off.
Like conditions are impacting the nearby nation, ushering in a period of extreme heat to the remote areas.
Officials have announced burning restrictions for concern about forest fires.
