When the temperature of the rising air approaches the dew point, water vapor condenses onto cloud condensation nuclei, such as dust or salt particles, forming tiny droplets. Persistent light winds advect moist air into the region, maintaining the cloud field for hours or even days until a weather system disrupts the delicate balance.
Moisture Supply and Sustained Stratus Cloud Development
Cooling Mechanisms and Saturation As the air mass ascends, it expands and cools at a rate determined by environmental pressure changes. The first involves warm air riding up and over a denser cold air mass at a frontal boundary, creating a gentle slope of lift.
In coastal regions, the interaction between cool ocean currents and warmer air frequently generates radiation fog that evolves into low stratus as the sun climbs higher. A shallow inversion acts like a lid, preventing the cloud tops from growing vertically and ensuring the cloud remains a horizontal sheet.
Moisture Supply and Sustained Stratus Cloud Development
This turbulence entrains dry air from above, occasionally breaking the cloud layer into fragments, yet the overall stratiform structure usually remains intact. Stratus clouds form through a process of widespread atmospheric cooling where moist air ascends gradually and reaches its dew point.
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