Powerful winds hitting speeds of as high as 155km/h (96mph) have caused around 90,000 properties without power and forced authorities to cancel over 100 flights, as reported by local media.
The winds are impacting the entire southern region and southern sections of the northern region, according to the weather forecasting body.
New Zealand authorities have issued infrequent high-level wind alerts - the most severe warning - in key areas including Wellington and Canterbury.
Residents have been urged to remain inside, stay off roads, and prepare for more power and communication outages.
Extensive Impact and Crisis Measures
This outage is primarily influencing residences mainly in the South Island, though authorities report that energy was being slowly brought back.
Domestic outlets have stated that in certain areas structures have suffered roof damage, whereas power lines and trees have been knocked down by the winds.
Across Wellington, a man was lost his life after being hit by a tree branch at a popular trail walking spot on Tuesday.
Also in the capital, a individual was swept into moving cars on a street by a strong gust of wind, in a event that was filmed in a widely shared car camera footage.
Flights to and from the urban area have been suspended because of the winds, while various routes and public facilities are shut down.
Simultaneously authorities in Canterbury have issued a state of emergency, to support emergency management operations.
Labor Protests Amid Extreme Conditions
These intense gusts on Thursday coincide with numerous of teachers, doctors and other public workers take part in what has been described as a "significant labor action", demanding higher wages and enhanced employment terms.
But the extreme weather has forced them to change certain arrangements, with some outdoor rallies relocated inside or called off.
Comparable winds are affecting Australia, bringing a period of extreme heat to the country's outback.
Officials have announced fire bans for concern about forest fires.
