Thick will blanket Auckland on Thursday and Friday.
Fog has affected flights to and from Auckland for the third day in a row.
Thick fog on Thursday and Friday saw the cancellation of 15 and 26 domestic flights respectively. Four flights were delayed.
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Fog restrictions were put in place at Auckland Airport at 1.30am on Saturday. They were lifted at 10.35am.
Forty-three domestic flights were canceled and 28 delayed, including main trunk flights from Wellington and Christchurch.
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Passengers were encouraged to visit the Auckland Airport website for the latest arrival and departure information or check with their airline.
International flights were not affected.
Turboprops – the smaller planes used for domestic services – don’t have the technology to allow pilots to ‘see’ far enough through the fog to land if they can’t use their eyes. Pilots need to be able to see 800 meters ahead of the aircraft to take off and land.
Meanwhile, Auckland Transport said ferry services coming in and out of the Auckland CBD on Saturday would also be delayed.
At least six had been canceled as of 10.10am, including from the CBD, Half Moon Bay, Devonport and Bayswater.
Flight cancellations continued into the afternoon on Friday.
It is not common for Auckland to experience several days of fog in a row, MetService meteorologist Stephen Glassey told Stuff on Friday.
The key ingredients for fog are clear skies, light winds and enough moisture near the ground. The air near the ground cools, turning the water vapor in the air into tiny droplets.
Those droplets suspend in the air, reducing visibility and causing a phenomenon called “radiation fog”.
“Because we had fog the previous night, there was already lots of moisture near the surface. So it didn’t take much cooling for the fog to occur again,” Glassey said