New Zealand: Severe weather forecast across western South Island and far southern North Island through at least Feb. 2

Severe weather is forecast across western South Island and far southern North Island through at least Feb. 2. A fast-moving front is forecast to track across New Zealand Feb. 2, bringing heavy rainfall to western areas of South Island and strong winds to parts of central New Zealand.

As of Feb. 1, the New Zealand National Meteorological Service (MetService) has issued the following weather warnings:

• Orange Heavy Rain Warning (middle level on a three-tier scale): the ranges of Buller, Grey Districts, and the ranges of the Westland. Rainfall of 7-9 cm (2.5-3.5 inches) and thunderstorms are possible.

• Orange Strong Wind Warning: Wellington and Wairarapa, including the Tararua District.

• Yellow Heavy Rain Watch: Canterbury headwaters north of the Rakaia River and Tasman west of Takaka including Nelson Lakes National Park.

• Yellow Strong Wind Watch: Marlborough Sounds.

Authorities will likely issue new alerts or update/rescind existing advisories as weather conditions change over the coming days.

Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rain has saturated the soil.

Authorities could issue mandatory evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are likely where significant flooding or landslides impact utility networks.

Floodwaters and debris flows will likely render some bridges or roadways impassable, impacting overland travel in and around affected areas. Ponding on road surfaces will probably cause hazardous driving conditions on regional highways. Authorities are likely to close some low-lying routes that become inundated by floodwaters temporarily. Flight delays and cancellations at airports are probable.

Localized business disruptions are likely in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, possible evacuations, and some employees' inability to reach work sites.