UFO‑like cloud mystery over New Zealand finally explained
Over New Zealand, for nearly 130 years, a peculiar cloud has consistently appeared, bearing a visual resemblance to an unidentified flying object (UFO). It is remarkable not only due to its appearance but also because it invariably forms in the same location, long piquing the curiosity of local residents. However, the explanation for this mystery is surprisingly straightforward.
Taieri Pet – as the inhabitants of New Zealand call the specific cloud that appears over the Strath Taieri region. Residents of Strath Taieri have become so accustomed to the cloud's presence that they regard it as their own "pet".
According to IFL Science, the strange cloud is essentially a simple phenomenon to explain. Taieri Pet is an altocumulus lenticularis, or lenticular cloud. It is a relatively rare occurrence that forms at altitudes above 6,000 metres.
Lenticular cloud over New Zealand
Altocumulus lenticularis forms due to the condensation of water vapour in areas where two conditions must be met: high pressure and low temperature. The commonly used term "lenticular cloud" refers to its distinctive appearance, forming in a shape reminiscent of an optical lens. Due to this resemblance, they are often referred to as "UFO clouds".
Lenticular clouds, including Taieri Pet, form when air masses are warmed by solar rays. This makes the air lighter and forces it to ascend, increasing its humidity. At a high altitude, the air cools, and the pressure decreases. The condensation of water vapour is the final step in forming altocumulus lenticularis clouds.
The cloud over New Zealand and the mountain barrier
As mentioned by IFL Science, John Law, a meteorologist from New Zealand, explains that Taieri Pet frequently appears in New Zealand. It forms regularly because it encounters a topographical barrier in the form of the Rock and Pillar Range in Otago, which runs perpendicular to north-western solid winds. These high mountains obstruct the airflow, causing the wind to rise. At this point, all the phenomena occur, leading to the formation of lenticular clouds.
Moreover, strong winds sculpt the fluffy cloud, imparting a characteristic and smooth appearance that is very similar each time the cloud appears.
