MetService says the storm is now hitting the Coromandel and moving south-east.
It is also starting to affect the area north of Gisborne.
High winds are reported in the lower North Island.
In Manuwatu, a truck and trailer unit has rolled on State Highway 57 near Tokomaru. It's blocking both lanes; no one has been injured.
Police say the high winds mean extreme caution is required by any high sided vehicles.
Elsewhere, SH1 in the Dome Valley is still closed.
Transit says SH16 is now partially open allowing traffic to head north via Helensville.
SH14 between Whangarei and Dargaville is also partially blocked between Snooks Rd and Old School Road.