It comes after NZ Transport Agecy Waka Kotahi posted that the Harbour Bridge was down to two lanes in each direction due to high winds this afternoon.
At 5.10pm, lanes were reopened, but caution was advised, especially for high-sided vehicles and motorcyclists.
This morning, destructive winds tore off a roof and left a trail of debris in Greymouth.
Footage on social media showed the twister sweeping through the West Coast township just after 8.30am, damaging property and sending debris swirling into the air.
At least one home had lost its roof. A sleepout had been lifted off its foundations. The violent wind lasted less than a minute.