A storm battered central New Zealand on Friday, ​knocking out power to thousands of households, triggering floods and landslides, and bringing air traffic to a standstill in the capital Wellington.The national forecaster Met Service issued multiple severe weather warnings as a low-pressure system swept across the country. It warned of ​heavy rain and gusts up to 120kph after recording winds exceeding 150kph in ⁠parts of the country overnight.The storm forced ​the cancellation of 200 flights in and out of Wellington.“Most ​flights in and out of Wellington airport have been cancelled today, and most, but not all, scheduled flights this evening have also been ​cancelled," the airport said. “The winds are forecast to ease ​tomorrow which hopefully will allow flights to resume."Air New Zealand confirmed it ‌had cancelled ⁠all domestic flights to and from the capital as well as all flights from the New Plymouth airport.“Services will only resume when it is safe to do so," the airline ​said.Wellington Electricity said ​4,000 customers ⁠had lost power and warned that further outages could occur as wind speeds peaked in the ​evening. The utility said it had earlier restored ​power ⁠to nearly 3,000 customers.“It may take a few days, possibly into mid next week to restore power to all customers," ⁠it ​said on its website.Officials in Lower ​Hutt, northeast of Wellington, reported flooded roads and two landslides, with emergency services ​responding.