A pilot recently filmed a remarkable cloud formation while flying at 40,000 feet over Sweden. The video shows a massive cumulonimbus incus, also known as an anvil cloud, whose size is comparable to a mountain range. The footage, taken by pilot Cesar Sirbu, quickly gained significant attention on social media platforms.

A cumulonimbus cloud is typically associated with thunderstorms and features a distinct flat, anvil-shaped top, with the term incus deriving from the Latin word for anvil. While many people usually observe these clouds from below, Sirbu’s unique perspective allowed him to view the cloud at its peak height, a rare occurrence for pilots.

This video certainly captures the awe of natural phenomena, illustrating how a commonplace thunderstorm can transform into an extraordinary visual experience when viewed from a unique angle.

Formation of the Anvil Cloud

The unique shape of the anvil cloud is attributed to the tropopause, an invisible barrier that separates the troposphere from the stratosphere. Below this boundary, temperatures decrease with altitude; however, above it, the trend reverses. When thunderstorms generate strong updrafts of rising air—moving at speeds of up to 100 kilometres per hour—this moist air pushes against the tropopause and cannot ascend further. Instead, it spreads horizontally, forming the characteristic flat top composed of ice crystals.

The anvil cloud filmed by Sirbu extends over several hundred kilometres, transported by upper-level winds. This expansive structure demonstrates the cloud’s significant size and the powerful atmospheric conditions driving its formation.

This occurrence highlights how weather phenomena can create visually stunning formations, resulting from specific atmospheric conditions rarely aligned for casual observers or even pilots.

Understanding Lightning Formation

 The cloud showcased in Sirbu’s video also exhibited lightning, which resulted from complex interactions within the storm. Specifically, at temperatures ranging from minus 10 to minus 20 degrees Celsius, tiny pellets of ice, known as graupel, collide with smaller ice crystals. These collisions facilitate the transfer of electric charge, with graupel typically gaining a negative charge while the lighter ice crystals acquire a positive charge.

As the voltage builds within the storm, reaching millions of volts, the air surrounding the charged particles becomes conducive to lightning. The resulting lightning pulses occur within the cloud rather than reaching the ground, a phenomenon known as intracloud lightning. Each lightning strike can heat the surrounding air to an astonishing 30,000 degrees Celsius, making it hotter than the Sun’s surface for a brief moment.

This intricate process illustrates the intense energy and complex interactions occurring within thunderstorm clouds, contributing to the captivating visual display witnessed in Sirbu’s footage.

Rarity of the Phenomenon

The opportunity to observe such cloud formations from a commercial cockpit is exceedingly rare, as airlines mandate pilots maintain a distance of at least 37 kilometres from severe thunderstorms. Achieving a lateral view from a cockpit at the altitude of the anvil cloud necessitates a specific combination of safety, optimal flight path, and fortunate timing, all of which Sirbu successfully encountered.

The storm observed during the flight likely reached heights between 10 and 15 kilometres, comparable to two Mount Everests stacked upon one another. This extraordinary sight serves as a reminder of the complex and dynamic nature of weather on Earth.

Such breathtaking moments serve not only as visual marvels but also as a testament to the power of nature, occurring continuously above while many people remain unaware during their everyday routines.

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