Drivers using Auckland's Harbour Bridge were urged to take care as strong winds hammered the structure this afternoon, while wild winds have brought down trees in Wellington and Hamilton.

A group of people were stuck in a vehicle that was hit by a falling tree near Hamilton International Airport about 2.23pm.

The tree blocked the Airport Rd near where it intersects with Raynes Rd, in Rukuhia, and people were being urged to avoid the area.

A Fire and Emergency NZ spokesman confirmed the occupants of the vehicle were uninjured.

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The trunk of the tree narrowly avoided the car, with its lighter, leafy branches covering the vehicle.

FENZ shift manager Colin Underdown said everyone had got out of the car with two people being checked by St John ambulance officers.

The council had been called as the tree had ripped out a water main when it fell, Underdown said.

Fire crews had been busy this afternoon with weather-related callouts, with 11 in the Waikato, five in Auckland and four in the Bay of Plenty - mostly powerlines and trees down, he said.

A whopping 400mm of rain has fallen on mountains on the West Coast as a storm batters the country, raising rivers to alarm levels in many areas.

A severe weather warning is in place for the Wellington region, with gales already reaching 137km/h in parts of Wellington, with winds still at dangerous speeds on the Rimutaka Ranges.

In Auckland the NZ Transport Agency tweeted that drivers of high-sided vehicles and motorcyclists should be extra careful due to strong winds on the bridge.

However about 3.35pm it said wind gusts on the bridge had eased.

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In Wellington, Air New Zealand flights are cancelled until mid-afternoon.

The airline said it would be running additional services for later this evening to accommodate disrupted customers and will continue to explore additional capacity as the day continues.

Jetstar services appear to be running as scheduled.

The gusts of wind in Wellington are so strong they have apparently cracked a window in Wellington's tallest building, the Majestic Centre. Photo / Facebook
The gusts of wind in Wellington are so strong they have apparently cracked a window in Wellington's tallest building, the Majestic Centre. Photo / Facebook

Across the rest of the city, the wind had downed trees in Makara, Strathmore, Island Bay, Thorndon, and Hataitai.

The strong winds had also reportedly cracked a window pane in the Majestic Centre tower in Willis St.

The council also reported a street light down in Aotea Quay and damaged power lines in Tawa and Hataitai.

"We recommend the public only ventures outside if they really need to, and to use the FixIt app to report any issues they may see."

This morning, MetService meteorologist Tahlia Crabtree said the gusts had been reaching 83km/h at Wellington Airport, which is what people around the city would be feeling.

"The wind gusts could damage trees, structures that aren't tied down like trampolines and anything that's unsecured."

Crabtree said the winds were expected to ease a little bit this afternoon, with a front moving in. The weather warning is in place until 6pm.

Air New Zealand said it was offering fare flexibility for "the next 72 hours, where customers with cancelled flights will have the option to transfer their booking to another date or hold the fare value in credit for up to 12 months toward future travel".

Cancelled flights at Wellington Airport. Photo / Emme McKay
Cancelled flights at Wellington Airport. Photo / Emme McKay

Customers with Wellington flights were strongly recommended to consider deferring non-urgent travel, and those who didn't need to travel, keep an eye on the airline's Arrivals and Departures page for the latest information.

At Wellington Airport, the arrivals and departure lounges were eerily quiet.

One passenger, Felix, said he was heading to San Francisco and then to South America but was left figuring out what to do with his flight cancelled.

"I've been saving up for a year and a half to go travelling all around the world ... so it's a bit stressful."

Brittany Thompson's flight to Auckland was also cancelled, and she had to be at work at 2.30 in the afternoon.

"Now we have to hire a car to drive to Palmerston North and fly from Palmy back to Auckland."

MetService meteorologist Lewis Ferris said while rain was battering the West Coast, it was also falling in areas where it's much needed including Blenheim - which has received 16mm in the last 24 hours - and Hawke's Bay.

However, it's unlikely to help any of the parched landscape in the area, especially with temperatures in the 30s forecasted for Thursday and Saturday.

Franz Josef had received 175mm in the last 24 hours, Haast 82.6mm, and Greymouth/Hokitika 58mm. Parts of Canterbury were also getting a bit of rain.

Ferris said while much of the heaviest bouts of rain has fallen in the South Island more rain is expected each day for the rest of the week, with brief reprieves in between.

The North Island could also expect showery weather off and on for the next week as the storm passes by. Northland and Bay of Plenty can expect some rain on Thursday and Friday.

Meanwhile, rain has set in on Hamilton's Seddon Park where the last day of the test between the Black Caps and England was being played out.