A NASA observation satellite has captured a remarkable image of an unusual, stationary cloud formation hovering over New Zealand’s Strath-Taieri region. This cloud, dubbed the “Taieri Pet” by locals, appears regularly over the rugged mountain range.
The image, taken on September 7, shows an elongated cloud along the southeastern mountain range. This formation, known scientifically as an altocumulus standing lenticular cloud (ASLC), forms when strong winds meet a steep geographical barrier, such as mountains. As the winds rise, a standing wave is created. At the wave’s crest, the air cools enough for water vapor to condense, resulting in the distinctive, layered cloud.
New Zealand MetService meteorologist John Law explained, “As the cloud forms on the crest of this wave, it remains almost stationary in the sky and is shaped by the strong winds blowing through it.” ASLCs are known for their unique shapes, sometimes resembling stacked discs or bowls that extend vertically, creating an even more otherworldly look when viewed from the side.
Due to strong winds and dynamic cooling and warming cycles, these clouds hold a “standing” appearance despite constant airflow. Weather observer Karl Philippoff described them as “very dynamic” and explained, “Each air parcel is undergoing this cycle of cooling, condensing, warming, and evaporating, while visually, the cloud appears to be standing still.”
With sharp edges and crisp form, the Taieri Pet is an indicator of high atmospheric winds, making it a telltale sign of intense environmental forces. NASA warns that flying near such clouds can be risky, as strong turbulence is a common hazard near ASLC formations.