MetService has issued a Severe Weather Watch, with heavy rain forecast for eastern Bay of Plenty and Northland

"A slow-moving front, embedded in a moist northerly airstream, continues to bring rain to the upper North Island Tuesday night and during Wednesday," says a MetService spokesperson.

"People are advised to keep up to date with the latest forecasts in case any changes are made, or further areas are added."

A Heavy Rain Warning has been issued for Bay of Plenty east of Whakatane. This is valid for 21 hours from 6pm Tuesday to 3pm Wednesday. Periods of heavy rain are forecast.

"Expect a further 80 to 110mm to accumulate,especially about the ranges," says a MetService spokesperson.

"Heavy rain may cause streams and rivers to rise rapidly. Surface flooding and slips are also possible and driving conditions may be hazardous."

A Heavy Rain Watch has been issued for Northland. This is valid for 17 hours from 6pm Tuesday to 11am Wednesday. Periods of heavy rain is forecast, especially in the north and east, with localised downpours. The downpours may exceed the reduced warning criteria - 30mm in six hours, but over a limited area.