Nearly 30 warnings and watches are in force as heavy rain, severe gales and snow to sea level are set to envelop central and southern New Zealand over coming days.
The polar blast starts later this afternoon and will last until Friday.
The lower North Island is being warned to brace for destructive gales and those in the South Island are advised that snow could affect road and bring stress to livestock.
MetService this morning issued snow warnings for many South Island highways, including the alpine passes and Dunedin's Northern Motorway (State Highway 1).
The heaviest fall looked set to be on the Milford Road (SH94), where up to 20cm was possible.
A strong wind watch for Clutha, Southland, Stewart Island and Fiordland comes into force first at 3pm today. MetService is warning people that gales may reach severe speeds in these areas.
An orange heavy rain warning then comes into play for Fiordland at 6pm for 12 hours and then for the headwaters of the Otago lakes and rivers from 8pm for 11 hours.
Orange heavy rain warnings have also been issued for Westland about and south of Otira and the headwaters of the Canterbury lakes and rivers about and south of Arthur’s Pass from this evening and for Westland north of Otira, and Buller from tomorrow morning.
MetService says thunderstorms and up to 150mm of rain are likely across many of these areas.
Meanwhile, a 23-hour orange road snowfall warning is in place for the Milford Road from 10am tomorrow.
Southland, Clutha, Dunedin, Central Otago and Southern Lakes will also be under a heavy snowfall watch for 18 hours from 4pm tomorrow.
“Snow is expected to lower to near sea level. Heavy snowfall is possible above 300 metres, where amounts may approach warning criteria.”
The "bitterly cold" mid-spring polar blast will see temperatures in the south plummet.
Tomorrow night Queenstown’s low will be 0C while in Invercargill it will be 1C and in Dunedin it will be 3C.
An orange strong wind warning has been issued for the Canterbury High Country from 9pm tonight for 14 hours. MetService said gales could be severe and reach 130kmh.
“Strong wind gusts could damage trees, powerlines and unsecured structures. Driving may be hazardous, especially for high-sided vehicles and motorcycles.”
Marlborough Sounds, Wellington and Wairarapa are also under strong wind warnings between 6am and 8pm tomorrow.
Strong wind watches have been issued for Otago, the Canterbury Plains including Banks Peninsula, Marlborough excluding the Sounds, Tararua District and Hawke’s Bay south of Hastings.
The cold snap looks to be short and sharp, as a ridge of high pressure is expected to bring settled weather to the country on Saturday.
Road snow warnings
Dunedin to Waitati Highway (SH1)
Valid: 5 hours from 10pm Thursday to 3am Friday.
Snow may briefly affect the road for a time Thursday night and overnight, and 1 to 3 cm of snow may settle on the road near the summit. Note, another burst of snow is possible later on Friday, and this warning may be extended.
Lindis Pass (SH8)
Valid: 6 hours from 9pm Thursday to 3am Friday.
Snow is forecast to briefly affect the road for a time Thursday night and overnight. Expect 1 to 3 cm of snow to settle on the road.
Crown Range Road
Valid: 6 hours from 9pm Thursday to 3am Friday.
Snow is forecast to briefly affect the road for a time Thursday night and overnight. Expect 1 to 3 cm of snow to settle on the road.
Haast Pass (SH6)
Valid: 12 hours from 8pm Thursday to 8am Friday.
Rain is forecast to turn to snow Thursday evening. Expect 4 to 8 cm of snow to settle on the road near the summit, with lesser amounts down to 100 metres.
Milford Road (SH94)
23 hours from 10am Thursday to 9am Friday.
Rain is forecast to turn to snow at higher levels late Thursday morning, then gradually lower to near sea level Thursday night or overnight. Expect 10 to 20 cm of snow to settle on the road above 800 metres, with lesser amounts down to near sea level.
Lewis Pass (SH7)
Valid: 14 hours from 12am Friday to 2pm Friday.
Rain is forecast to turn to snow Thursday night. Expect 5 to 10 cm of snow to settle on the road above 800 metres, with lesser amounts at lower levels.
Arthurs Pass (SH73)
Valid: 12 hours from 10pm Thursday to 10am Friday.
Rain is forecast to turn to snow Thursday night. Expect 5 to 10 cm of snow to settle on the road above 800 metres, with lesser amounts at lower levels.
- additional reporting ODT Online
