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Holidaymakers are being warned that remnants of Cyclone Evan will be passing through the upper North Island over Christmas, causing rivers to rise with surface flooding possible.
MetService this morning issued a severe weather warning for northern parts of the North Island.
A deep low - which was formerly Cyclone Evan - would lie north of Northland tonight, then just west of Cape Reinga by the end of tomorrow, before drifting west of the North Island on Christmas Day, MetService advised.
Rain was expected to become heavy later this afternoon, and continue through Monday and into Christmas Day.
The heaviest rain would hit Northland, Auckland north of Whangaparoa, and the Coromandel Peninsula north of Tairua.
MetService warned holidaymakers and trampers that rivers and streams could rise rapidly and that slips and surface flooding was possible.
WeatherWatch analyst Aaron Wilkinson said the heaviest rain and strongest winds would move into Northland tomorrow, before moving south.
By Boxing Day the low would weaken and move east, bringing a period of rain to most of the country.
The lower South Island could remain fairly dry, he said.