Heavy rain and northwest gales for parts of the South Island

An active front moves northwards over the South Island this evening and during Monday morning, accompanied by heavy rain and northwest gales. The front should weaken over central New Zealand later on Monday.

Severe weather Warnings and Watches are in force.

People are advised to keep up to date with forecasts.

Area: Headwaters of the Otago lakes and rivers

Period: 8hrs from 8pm Sun, 7 Dec - 4am Mon, 8 Dec

Forecast: Expect 90 to 110 mm of rain about the main divide, and 50 to 80 mm within 15 km farther east. Peak rates of 20 to 30 mm/h expected about the divide with possible thunderstorms. Freezing level above 3000 metres. Minimal chance of upgrading to a Red Warning.

Impact: Streams and rivers may rise rapidly. Surface flooding, slips, and difficult driving conditions possible.

Action: Clear your drains and gutters to prepare for heavy rain. Avoid low-lying areas and drive cautiously. Preparedness advice.

Area: Fiordland

Period: 5hrs from 8pm Sun, 7 Dec - 1am Mon, 8 Dec

Forecast: Expect a further 50 to 70 mm of rain, with thunderstorms possible. Peak rates of 20 to 30 mm/h expected. Heavy showers with thunderstorms are possible after the warning period and until dawn. Minimal chance of upgrading to a Red Warning.

Impact: Streams and rivers may rise rapidly. Surface flooding, slips, and difficult driving conditions possible.

Action: Clear your drains and gutters to prepare for heavy rain. Avoid low-lying areas and drive cautiously. Preparedness advice.

Area: The Canterbury High Country

Period: 9hrs from 8pm Sun, 7 Dec - 5am Mon, 8 Dec

Forecast: Severe gale northwesterlies gusting 120 km/h in exposed places. Minimal chance of upgrading to a Red Warning.

Impact: Damage to trees, powerlines, and unsecured structures possible. Driving may be difficult, especially for high-sided vehicles and motorcycles.

Action: Prepare your property by securing items that can be picked up by strong winds. Drive cautiously. Preparedness advice.

Issued: 8:34pm Sun, 7 Dec
Next update: 10am Mon, 8 Dec
Action advice supplied by the National Emergency Management Agency.