- Plan ahead by keeping an eye on MetService weather warnings and NZTA's highway conditions
The biggest snowfall of winter so far is on its way for Canterbury alpine passes and inland state highways, and road users are advised to prepare.
In an advisory, MetService said snow was possible above 400 metres about inland parts of Southland and Clutha, and southern parts of the Queenstown Lakes District and Central Otago. Snow may also affect some high level roads over other parts of the South Island.
In Canterbury, the snow would have the biggest impact on Monday and Tuesday, according to forecasts supplied to the NZ Transport Agency/Waka Kotahi (NZTA).
A spokesman said this may mean state highway closures or restrictions.
Those travelling home across the South Island after the All Blacks-France rugby test in Christchurch on Saturday night, or for school holiday trips, should make a plan, he said.
Up to 20cm of snow was forecast to fall in the Porters Pass (State Highway 73) and Lewis Pass (SH 7) areas on Monday, while there is a risk of 10-plus cm in the Burkes Pass to Lake Tekapo area in the Mackenzie Basin on Tuesday.
Rain and wind for western areas
Ahead of the snow, MetService has issued rain and wind warnings for much of the western side of the South Island.
Orange heavy rain warnings are in place for Fiordland about and north of Doubtful Sound from 3pm today, for the headwaters of the Otago lakes and rivers from 1am tomorrow, the Ranges of Westland and the headwaters of the Canterbury lakes and rivers south of Arthur's Pass from 3am tomorrow.
Streams and rivers may rise rapidly, and surface flooding, slips and difficult driving conditions were possible.
Meanwhile, a heavy rain watch is in place for Fiordland south of Doubtful Sound from 7pm today until 11am on Saturday, with thunderstorms possible in the morning.
The Canterbury high country was also subject to a MetService orange strong wind warning, from 3am tomorrow, when severe northwest gales may gust up to 130km/h in exposed places.
"With potential for road snow closures and delays, people are advised to carry warm clothes, water and food in case they get stuck, or need to stop and wait for the weather to pass. Ensuring sufficient battery range or petrol in the tank is also advised in case there are detours and diversions required," the spokesman said.
"In heavy rain, NZTA reminds people to think about adjusting their speeds and travelling distances, avoiding sudden braking, and staying visible (using headlights in daytime hours).
"People are also urged to avoid driving through floodwaters where the depth is unclear and there may be hidden obstructions. Those driving high-sided vehicles, towing vehicles or motorcycles should be especially careful in severe gales."
- Allied Media
