Severe gales hitting velocities of up to 155km/h (96mph) have caused around 90,000 properties lacking electricity and forced authorities to call off over 100 flights, based on domestic outlets.
These gusts are influencing the whole South Island and southern sections of the North Island, according to the weather forecasting body.
Officials in New Zealand have announced infrequent severe gust advisories - the top caution category - in key areas including Wellington and Canterbury.
People have been urged to stay indoors, avoid travel, and prepare for further power and communication outages.
Widespread Damage and Emergency Response
The electricity loss appears to be affecting residences predominantly in the southern region, although agencies say that energy was being slowly brought back.
Local media have reported that in various locations roofs have been ripped off houses, while trees and electricity poles have been toppled by the winds.
Within the capital, a individual was lost his life after being struck by a tree branch at a popular trail walking spot on earlier this week.
Additionally in the city, a individual was pushed toward approaching vehicles on a street by a intensive burst, in a event that was filmed in a widely shared car camera footage.
Flights to and from the metropolis have been suspended due to the gusts, and some roads and libraries are also closed.
Meanwhile Canterbury officials have issued a crisis declaration, to facilitate emergency management operations.
Strike Action Alongside Extreme Weather
The wild winds on Thursday occur while many of teachers, doctors and other public workers are engaged in what has been described as a "major walkout", demanding higher wages and enhanced employment terms.
However the intense climate has forced them to change some of their plans, with some outdoor rallies moved indoors or called off.
Similar gusts are also sweeping Australia, bringing a heatwave to the country's outback.
Agencies have declared flame prohibitions for concern about forest fires.
