An escalation in warnings about heavy rain and severe gales in the South Island has reinforced the need for road users to stay across the conditions and plan for disruption on the roading network.

There are now orange* heavy rain warnings in place for the Buller, Grey and Westland districts on the West Coast, and the headwaters of the Canterbury lakes and rivers about and south of Arthur's Pass. In the case of the Buller and Grey districts, these warnings extend through to tomorrow night (*an orange level warning means surface flooding, slips, and difficult driving conditions are possible).

Southland is also now subject to a heavy rain watch, where the amount of rain may approach warning criteria, from 4pm tomorrow though to 3am Saturday.

Orange strong wind warnings are now in place for tomorrow for the Canterbury high country north of the Rangitata River, and for the area around Kaikōura north to Marlborough, as severe gale force north to northwesterlies are expected to gust up to 140km/h in exposed places. This means that damage to trees, powerlines, and unsecured structures is possible and driving may be difficult.

A strong wind watch is in place for Fiordland north of Doubtful Sound for tomorrow night.

New Zealand Transport Agency Waka Kotahi (NZTA) reminds people that heavy rain means slippery roads and drivers should think about adjusting their speed and travelling distances, avoiding sudden braking, and staying visible. People should also avoid travelling through floodwaters where risks may be hidden.

NZTA also urges extra care when travelling in strong winds, especially those in high-sided or towing vehicles and on motorcycles.

© Scoop Media