Mysterious "UFO cloud" over New Zealand decoded

Taieri Pet is the name New Zealanders give to this specific cloud appearing over the Strath Taieri region. Residents of Strath Taieri have grown so accustomed to the cloud's presence that they treat it as a local "pet."

According to IFL Science, the unusual cloud is actually a simple phenomenon to explain. Taieri Pet is an altocumulus lenticularis, or lenticular cloud. It is a relatively rare phenomenon that forms at altitudes above 20,000 feet.

Altocumulus lenticularis develops due to the condensation of water vapor in areas where two conditions are met: high pressure and low temperature. The commonly used term "lenticular cloud" is due to its unique shape, similar to an optical lens. Because of their appearance, these clouds are often called "UFO clouds."

Lenticular clouds, including Taieri Pet, form when solar rays heat air masses. This makes the air lighter, causing it to rise and increase in humidity. At high altitudes, the air cools, and the pressure decreases. The condensation of water vapor is the final stage in the formation of altocumulus lenticularis clouds.

John Law, a meteorologist from New Zealand quoted by IFL Science, explains that Taieri Pet is a commonly occurring phenomenon over New Zealand. It forms regularly due to a topographical barrier provided by the Rock and Pillar Range in Otago. These mountains run perpendicular to strong northwestern winds. The high mountains block the airflow, causing the wind to rise. There, all the conditions are met for the formation of lenticular clouds.

Additionally, strong winds shape the fluffy cloud, giving it a characteristic and smooth appearance that remains similar each time it materializes.