New Zealand: Severe weather forecast across central and northern South Island and southern North Island through early Feb. 25

Severe weather is forecast across northern South Island and southern North Island through at least early Feb. 25. As of Feb. 24, the New Zealand National Meteorological Service (MetService) has issued the following weather warnings:

South Island

• Orange Heavy Rain Warning (middle level on a three-tier scale): Buller, the ranges of Westland District and north of Mt Cook. Up to 90 mm (3.5 inches) of rainfall is forecast.

• Yellow Heavy Rain Watch: The Grey District.

• Strong Wind Watch: Canterbury High Country north of Lake Pukaki.

North Island

• Orange Heavy Rain Warning (middle level on a three-tier scale): The Tararua Range. Up to 90 mm (3.5 inches) of rainfall is forecast.

• Strong Wind Watch: Wellington and Wairarapa from about Greytown southward.

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.