MetService is warning of a risk of localised downpours of 25 to 40 mm/h with heavy rain falling until early this afternoon.
A driver heading to Waihi through Whangamata says surface flooding is already happening and believes it won’t be long before the route is closed.
Her advice is for people to go via the Whitianga route if they can.
A MetService spokesman said a band of heavy rain and a few embedded thunderstorms is lying across the far south of Coromandel Peninsula and the far west of Bay of Plenty.