Severe gusts hitting velocities of up to 155km/h (96mph) have resulted in approximately 90,000 homes lacking electricity and led officials to halt more than 100 air travel services, based on domestic outlets.
The gales are affecting the whole South Island and southern sections of the northern region, according to the weather forecasting body.
New Zealand authorities have issued infrequent severe gust advisories - the most severe warning - in key areas such as Canterbury and Wellington.
Residents have been urged to avoid going outside, refrain from journeys, and make arrangements for more electricity and network failures.
Widespread Destruction and Emergency Measures
This outage seems to be impacting residences mostly in the South Island, although authorities report that energy was being slowly brought back.
Local media have reported that in certain areas structures have suffered roof damage, and utility poles and vegetation have been knocked down by the winds.
In Wellington, a person was fatally injured after being impacted by a tree branch at a popular trail walking spot on Tuesday.
Additionally in the city, a woman was swept into approaching vehicles on a road by a powerful blast, in a moment that was captured in a viral dashcam video.
Air travel in and out of the urban area have been suspended due to the gusts, whereas certain highways and community centers are shut down.
Meanwhile authorities in Canterbury have declared a emergency situation, to assist disaster response efforts.
Labor Protests Alongside Harsh Conditions
The wild winds on Thursday coincide with many of educators, medical professionals and government employees are engaged in what has been described as a "major walkout", demanding better pay and working conditions.
But the severe conditions has pressured them to modify various scheduled activities, with various open-air gatherings relocated inside or abandoned.
Comparable winds are affecting the nearby nation, ushering in a period of extreme heat to the nation's interior regions.
Officials have issued flame prohibitions for concern about bushfires.
