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MetService meteorologist Dan Corbett said Northland and Auckland were receiving the brunt of the storm this afternoon, with wind gusts of up to 100km/h at Manukau Heads.
There were also strong gusts of up to 90km/h at Auckland airport and gusts of 100km/h in exposed parts of the Hauraki Gulf.
A Fire Service northern communications spokeswoman said there had been about nine callouts before the wind picked up in Auckland, and fewer than 10 since.
"Trees on roofs, on cars, on power lines, roofs coming off - that sort of thing.
But it's dropped off a bit. We were steady for about half an hour, probably about 3pm.''
Among the jobs were a tree on a roof in Panmure, a tree on a house and power lines in Epsom, and a tree on a car. All had been dealt with quickly.
The New Zealand Transport Agency (NZTA) said strong southwesterly winds in the Auckland region were making driving conditions difficult, with gusts of up to 81.5km/h on the Harbour Bridge and 70km/h on the Mangere Bridge.
The wind had also brought down power lines in Warkworth, which was delaying traffic on State Highway 1 through the town.
"Driving conditions will be difficult for everyone heading home from work tonight, especially on the harbour bridge which carries some of the city's highest volumes of traffic,'' NZTA national journey manager Kathryn Musgrave said.
"People do need to take extreme care, and to be aware of the vehicles around them and of any sudden movements due to the extreme weather.''
A Coastguard spokesman said winds had been gusting up to 60 knots (111km/h) at Bean Rock in the Hauraki Gulf, with the average speed about 37 knots (68.5km/h).
The Coastguard had been called to a boat dragging its anchor in the Whangarei Harbour but the vessel was now "quite safe''. There had been no other weather-related callouts.
Fire Service northern communications shift manager Tania Matthews said there had been about 20 weather-related callouts since 2pm.
"They were mainly trees and branches falling on roads, cars, power lines, telephone lines, roofs.''
Other jobs included loose roofing and signs.
"Nothing serious - no injuries reported or anyone trapped or anything like that. We're just going in and, where we can, deal with it. Otherwise, if we can't deal with it, we're contacting either the council or the homeowners.''
The jobs had been coming in "thick and fast'' for an hour but had since levelled off. Most jobs were in Auckland, although firefighters were also called to jobs in Kaiwaka, north of Auckland, and Pukekawa and Paeroa in Waikato.
Lines company Vector said 1856 customers were without power due to four weather-related outages in the northern part of the network.
In Titirangi, 880 customers were without power after a tree struck a line. There were 99 customers without power in Waiwera, 149 in Puhoi, 195 in Helensville and 533 in Muriwai.
Vector spokeswoman Sandy Hodge said crews were continuing to work in blustery conditions to restore further customers.
The New Zealand Transport Agency is urging motorcyclists and high-sided vehicles to take extra care on the Harbour and Mangere bridges due to strong winds.
Mr Corbett said the bad weather would linger around Auckland for the next couple of hours before moving over the Bay of Plenty.
Mr Corbett said the low from the ex-cyclone was bringing strong southwesterly winds to Northland, Auckland and most recently the Bay of Plenty.
"We're just sitting around the peak, in the next hour or two, of this strong core of sou'westers moving across this part of the country. That will ease back, as it already has done so across the north of Northland.''
The strong winds would move to Tauranga and the eastern Bay of Plenty this evening as the low moved east of the North Island.
"The actual centre of the low currently sits probably somewhere about Rotorua, so you can imagine a clockwise flow of wind going around it.
"The initial band of subtropical rain started off this morning in the shape of a boomerang from Taranaki to Wellington. That is easing and fragmenting and it's drifting back slowly across Cook Strait, coming back into Wellington.''
By tomorrow morning, the remains of the subtropical low would be sitting east of Hawkes Bay, leaving a typical westerly flow.
"There will be some patchy cloud, but it's a dry, brighter looking start to the day.''