The Mets Service is warning of possible severe storms for parts of New Zealand and heavy rains for the West Coast.
It is forecasting a front on the South Island late Thursday and Friday that will bring northwest storms and torrential rains to western areas, including Otago and Canterbury Headwaters.
A spokesman said northwest storms could be severe from Canterbury High Country to Southland and Fairland. Northwest Hurricanes could be expected in Wellington and Virarpa late Thursday.
It also issued a severe storm alert from Jackson Bay to Crimea for Thursday, with waves rising to 7 meters on Wednesday but falling to 4 meters on Thursday.
Dangerous coastal conditions were expected and extra precautions were recommended around the coast.
* Stormy weather week brings heavy rain, less snow, storms and dangerous seas.
* Heavy rain up to 130 km per hour in south and central areas
* Weather warnings in the form of heavy rains, 120 km per hour is ready to sweep the country.
The Mets Service was also warning of heavy rains, causing canals and rivers to overflow. Superficial flooding and slipping were also possible as were dangerous driving conditions.
Westland, south of Otera, is expected to receive 120 mm to 160 mm of rain in 27 hours from 8 a.m. Thursday to 11 a.m. Friday.
Strong wind warnings are being issued for Canterbury High Country and Virapa where winds of up to 130 kmph are expected.
Strong winds can damage trees, power lines and unsafe structures. A spokesman said driving could be dangerous, especially for high-speed vehicles and motorcycles.
The wind speed for Wellington was 9pm on Thursday night to 8pm on Friday, while northwesterly winds sometimes reached severe storms.
The strong winds for Feverland, Southland and Otago will continue to blow from 10 a.m. to 11 p.m. Thursday, and strong winds will blow in the open.
Heavy rain was observed for the headwaters of Canterbury Lakes and Rivers south of Arthur Pass during the 13 hours from 10pm on Thursday night to 11am on Friday. It will bring heavy rains to the ends of Otago lakes and rivers.