In recent months, NASA's Terra satellite swiftly passed over the Gulf of Mexico, capturing peculiar clouds resembling a punched sky. A fishing influencer shared a TikTok video featuring the clouds, set to 'Stranger Things' theme music. So, how do these bizarre clouds form?
Cavum clouds over the Gulf of Mexico.
Unusual 'Cavum Clouds' Over Florida
NASA's Terra satellite recorded a group of cavum clouds near Florida's west coast on January 30, a phenomenon linked to the high volume of flights, exceeding 1,000 per day, from Miami International Airport, as reported by the agency.
The Terra satellite, with a primary focus on examining Earth's atmosphere and climate change effects, is crucial for researchers who employ its data to chart the impact of both human activities and natural disasters on the planet.
Although cavum clouds have been observed since the 1940s, it took nearly 15 years for scientists to uncover their explanation. Also known as hole-punch clouds, these distinctive formations, visible from both ground and space, have been frequently misinterpreted as unconventional objects due to their atypical appearance.
The creation of cavum clouds is intricately linked to aircraft traversing through mid-level altocumulus clouds composed of supercooled droplets, as revealed in studies conducted by NASA's Langley Research Center in 2010 and 2011.
The research emphasized that the angle at which an aircraft passes through these clouds influences the size of the resulting cavum, asserting that any type of plane can generate these unique cloud formations.
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The Science Behind Cavum Clouds
The enigma of Cavum clouds was unraveled by scientists from the University Corporation for Atmospheric Research (UCAR) in 2010 and 2011. These mid-altitude altocumulus clouds consist of exceptionally pure, supercooled water vapor, maintaining a liquid state despite a frigid temperature of 5 degrees Fahrenheit.
When aircraft wings or propellers alter the pressure around these droplets through adiabatic expansion, the delicate conditions supporting the vapor's liquid state break, initiating the freezing process. As ice crystals form and grow heavier, they fall, creating a void in the cloud layer known as a "hole punch."
UCAR's studies revealed that adiabatic cooling, resulting from pressure and volume changes, drops the supercooled water vapor an additional 36 degrees Fahrenheit, causing spontaneous freezing or "homogeneous ice nucleation."
While the falling ice crystals often create the distinctive hole punch effect, they may sometimes remain visible as wispy trails known as virga - streaks of precipitation that evaporate before reaching the ground.
Despite sounding exotic, the phenomenon of supercooled droplets forming altocumulus clouds and producing hole punch clouds is relatively common, covering approximately 8% of Earth's surface at any given time. UCAR's research, combining data from aircraft flights, satellite observations, and weather models, provided a comprehensive understanding of the atmospheric mechanisms behind hole punch clouds.
The angle at which an aircraft passes through the altocumulus cloud bank influences the features of the resulting Cavum, with sharper angles producing smaller, more circular hole punches and shallower angles creating elongated formations called "canal clouds" with lengthier virga trails.
Despite the scientific explanation, the striking visual impact of Cavum clouds continues to awe observers with their unusual voids and captivating blue gaps.
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