Aucklanders last night were treated to an unusual cloud formation across the sky.
MetService said the cloud formations are relatively uncommon, occurring a handful of times per year, and were commonly referred to as Kelvin-Holmholtz clouds.
The clouds are formed due to atmospheric instability when there is sufficient wind shear - the same force which is responsible for turbulence when travelling by aircraft.
MetService said they observe the clouds once every 1-2 months or so.
This image was sent to 1 NEWS by Tony Cooper.
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