Powerful gusts attaining velocities of as high as 155km/h (96mph) have resulted in around 90,000 households without power and compelled agencies to call off over 100 flights, based on local media.
The gales are affecting the complete South Island and southern sections of the North Island, according to the country's meteorological service.
New Zealand authorities have announced infrequent red wind warnings - the highest alert level - in key areas encompassing Wellington and Canterbury.
People have been advised to remain inside, stay off roads, and prepare for additional power and communication outages.
Widespread Destruction and Crisis Measures
The electricity loss seems to be impacting residences mainly in the South Island, although officials report that the electricity supply was being slowly brought back.
Local media have stated that in various locations roofs have been ripped off houses, whereas trees and electricity poles have been brought down by the gusts.
In Wellington, a man was fatally injured after being struck by a tree branch at a popular trail walking spot on earlier this week.
Also in the capital, a female was blown onto moving cars on a thoroughfare by a strong gust of wind, in a event that was filmed in a popular vehicle recording.
Flights to and from the city have been suspended due to the winds, and various routes and public facilities are not operating.
Simultaneously local leaders have announced a crisis declaration, to support emergency management operations.
Strike Action During Harsh Weather
The powerful gales on today coincide with tens of thousands of school staff, physicians and civil servants are participating in what has been described as a "significant labor action", calling for higher wages and enhanced employment terms.
However the severe conditions has pressured them to alter certain arrangements, with some outdoor rallies moved indoors or called off.
Similar gusts are also sweeping Australia, ushering in a heatwave to the remote areas.
Authorities have issued flame prohibitions for apprehension regarding bushfires.
