Warning as cyclone approaches NZ

Satellite image from MTSAT geostationary satellite via the Japanese Meteorological Association shows Cyclone Pam near Vanuatu. Photo / JMA

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A severe tropical cyclone, which could be reclassified as a supercyclone, is likely to be down-graded before it reaches New Zealand, but warnings are still being issued for residents to be prepared.

MetService Meteorologist Georgina Griffiths said the impact of tropical cyclone Pam would likely be limited to the east of the North Island.

"At this stage, the eastern seaboard of the North Island could possibly get the full trifecta of impacts - damaging seas along the eastern coastline, gale to severe gale south-easterly winds, and the possibility of heavy rain," Ms Griffiths said.

For Northland, northern Auckland and the Coromandel Peninsula, MetService said rain could become heavy overnight Sunday and during Monday and southeast gales could become severe.

"Gisborne and northern Hawkes Bay look most likely to bear the brunt of this system, with warning amounts of rainfall looking likely," Ms Griffiths said.

Gisborne and Bay of Plenty Civil Defence has issued a warning for residents to be prepared.

Gisborne Spokesman Richard Steele said people in coastal areas should take particular care.

"We advise people to be prepared. Make sure they have enough food and water to last for three days, and that they have any medication they need. The key message is to be prepared and be self-reliant."

He said people should be clearing gutters and tying down anything likely to blow away.

"Potentially, there could be significant rain but we cannot yet confirm the figures," Mr Steele said.

Ms Griffiths said the swells could reach 5 to 6 metres on Sunday and rise to 8 metres on Monday.

The Coastguard urged boaties to be prepared and secure their vessels before the worst of the weather sets in.