Intense gusts hitting velocities of as high as 155km/h (96mph) have caused approximately 90,000 homes without power and compelled agencies to halt more than 100 air travel services, according to domestic outlets.
The winds are influencing the whole southern region and southern sections of the North Island, per the national weather agency.
The nation's agencies have issued infrequent high-level wind alerts - the highest alert level - in key areas encompassing Canterbury and Wellington.
People have been advised to stay indoors, stay off roads, and make arrangements for further power and communication outages.
Broad Damage and Crisis Response
The power cut appears to be affecting households mostly in the South Island, although authorities report that energy was being slowly brought back.
Local media have indicated that in various locations structures have suffered roof damage, and power lines and trees have been knocked down by the winds.
Across Wellington, a man was killed after being struck by a tree branch at a popular trail walking spot on Tuesday.
Meanwhile in Wellington, a female was blown onto oncoming traffic on a street by a powerful blast, in a incident that was recorded in a viral dashcam video.
Flights in and out of the metropolis have been cancelled due to the gusts, whereas some roads and libraries are not operating.
Simultaneously authorities in Canterbury have declared a state of emergency, to assist disaster response efforts.
Work Stoppages During Harsh Weather
These intense gusts on this day occur while many of teachers, doctors and other public workers are engaged in what has been described as a "major walkout", demanding improved salaries and workplace environments.
But the extreme weather has forced them to alter certain arrangements, with several external protests relocated inside or cancelled.
Similar gusts are affecting the nearby nation, causing a high-temperature event to the remote areas.
Authorities have declared burning restrictions for concern about bushfires.
