A heavy rain warning has been issued for the Bay of Plenty.

A slow-moving front lies over the North Island with a trough approaching tonight, warns the MetService.

"This front is forecast to deliver further outbreaks of heavy rain to parts of the upper North Island, and eastern Bay of Plenty has now been upgraded to an Orange Warning.

"A Heavy Rain Watch remains in force for Northland.

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

The MetService says heavy rain may cause streams and rivers to rise rapidly.

"Surface flooding and slips are also possible and driving conditions may be hazardous."

Image: MetService.

Area: Bay of Plenty east of Whakatane

Valid: 18 hours from 9pm Tuesday to 3pm Wednesday

Forecast: 80 to 100mm are expected to accumulate, especially about the ranges.Note this rainfall is on top of the 30 to 50mm that has already fallen.

Change note: Upgraded to an Orange Warning