Unexplainable

Cloud atlas

February 2, 2026

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  • Clouds are complex, emergent phenomena whose behavior is difficult to predict, creating the largest source of uncertainty in climate models. 
  • Clouds are composed of liquid water droplets condensing around microscopic solid particles (aerosols), and despite appearing weightless, a cubic kilometer of cloud can contain about a million pounds of water. 
  • The impact of clouds on future climate warming is uncertain, as low, white clouds tend to reflect sunlight (cooling effect), while high, icy clouds act like a blanket (warming effect). 

Segments

Sound Design Introduction
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(00:00:40)
  • Key Takeaway: Cloud sounds were created using ocean waves and lava bubbles for texture.
  • Summary: The sound designer for Unexplainable, Christian Ayala, joined the team while working on the episode “Cloud Atlas.” He struggled to capture the sound of various clouds, comparing them to the ocean. He settled on layering the sound of lava bubbles to convey the slow-moving nature of clouds.
Flying into Thunderstorms
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(00:01:31)
  • Key Takeaway: Thunderstorm research involves flying modified WWII-era aircraft into cumulonimbus clouds.
  • Summary: A pilot describes flying a 1949 vintage aircraft into towering cumulonimbus storms to witness their power and beauty. Inside the storm, the aircraft experienced intense noise from hail and visible electrical phenomena like St. Elmo’s fire. The metal aircraft acted as a Faraday cage, protecting occupants from lightning strikes.
Why Study Clouds
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(00:04:32)
  • Key Takeaway: Clouds are crucial mediators of weather, affecting rainfall, temperature, and crop viability.
  • Summary: Despite being ubiquitous, much about cloud formation and movement remains unknown, necessitating direct observation, such as flying into storms. Clouds govern real-world interactions like rainfall and temperature regulation. Understanding them is vital for predicting water availability for crops and heat accumulation.
Cloud Composition and Weight
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(00:07:11)
  • Key Takeaway: Clouds are liquid droplets condensed around microscopic solid aerosols like dust or salt.
  • Summary: A cloud forms when water vapor condenses around tiny particles called aerosols, which can be dust, salt spray, or pollution. A cubic kilometer cloud can contain about a million pounds of water, kept afloat by its very low density. Atmospheric conditions, not just the presence of aerosols, determine if clouds will form.
Complexity of Cloud Dynamics
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(00:10:30)
  • Key Takeaway: Modeling cloud behavior beyond a single droplet is extremely difficult due to chaotic, layered complexity.
  • Summary: When modeling billions of droplets, the system becomes chaotic, similar to a double pendulum, where small initial differences grow exponentially. This microscopic complexity makes scaling up predictions to meters and kilometers extremely hard. Clouds are emergent phenomena whose aggregate behavior shifts from that of individual water droplets.
Cloud Impact on Climate Change
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(00:17:58)
  • Key Takeaway: Clouds present a dichotomy in climate change, either enhancing warming or mitigating it.
  • Summary: Cloud behavior is the largest source of uncertainty in climate models after human emissions scenarios. Low, white clouds reflect solar radiation back to space, mitigating warming. High-altitude clouds made of ice act like a blanket, trapping outgoing infrared radiation and enhancing warming.
Historical Cloud Records
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(00:20:04)
  • Key Takeaway: Scientists lack a pre-industrial baseline for cloud behavior, relying on historical records like ship logs and art.
  • Summary: There is no fossil record for clouds, making it difficult to know their pre-industrial state before human interference. Scientists are digitizing centuries of handwritten maritime shipping logs to sample historical ocean cloudiness. Art, such as Edvard Munch’s The Scream, may depict atmospheric events like post-volcanic soot dispersal.
Final Reflections on Atmosphere
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(00:26:41)
  • Key Takeaway: Humility regarding atmospheric unknowns should inspire greater effort to study our environment, which we inhabit as an ocean.
  • Summary: The vast unknowns about past and future cloud behavior necessitate humility and motivation to study the atmosphere further. Humans live within the atmosphere, which is described as an ocean we inhabit from the seabed. Appreciating the sky encourages observers to recognize their role as participants in atmospheric processes.