Heavy rain continues to fall across many parts of the North Island and is expected to cause river and coastal flooding in some parts today reports WeatherWatch.co.nz.

Waikato, Coromandel, and the Bay of Plenty are bearing the brunt of a summer storm, which won’t let up till overnight tonight.

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Up to 400 millimetres of rain is expected in some areas, Civil Defence says sizeable river floods are inevitable, along with coastal surface flooding.

Waikato Regional Civil Defence spokesman, Greg Ryan, says Coromandel already has high tides, and northerly winds will push sea levels up further.

“On the Haurkai plains there’s a number of rivers through there that are vulnerable” he told Newstalk ZB. “Also around Lake Taupo, we’re expecting a significant amount of rain.”

The Northland and Auckland regions are also being drenched.

WeatherWatch.co.nz analyst, Philip Duncan, says the weather pattern has been well forecast. “La Nina produces these dramatic rain events, so you can go for days and days if not weeks and weeks without rain and then the rain arrives in one big go and it falls quite heavily.”

The Bay of Plenty Emergency Management flood room will be activated from 9am Sunday morning with up to 70 millimetres of rain having fallen overnight.

Rivers haven’t yet swollen up much, but they are expected to rise steadily during the day.

The Okere Gates near Rotorua have already been opened to increase flows from Lake Rotoiti. TrustPower is increasing generation from the Matahina Dam this morning, and expects increased flows in the Rangitaiki River.

Community Relations Manager, Bronwyn Campbell, is warning people to be prepared, “Rain will cause rivers and streams to rise quickly, with slips and localised flooding possible” she said. “All farmers should move stock to high ground, and if people don’t need to travel they should stay home”.

The rain is being forecast to continue till around midday on Monday.

Latest warnings and watches can be found here

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– NewstalkZB, WeatherWatch.co.nz