What constitutes visible moisture according to SOPM?

The definition of visible moisture according to Standard Operating Procedure Manual (SOPM) includes specific atmospheric conditions leading to the presence of moisture that can affect flight operations. Fog, when it reduces visibility to one mile or less, is classified as visible moisture because it can contribute to significant weather phenomena and operational limitations.

This definition is crucial for pilots because the presence of visible moisture has implications for aircraft performance, the potential for icing conditions, and other operational considerations during takeoff, flight, and landing. Fog specifically can create challenges due to its ability to obscure visibility, making it an important factor in flight safety and decision-making.

Other atmospheric phenomena, such as rain, snow, and clouds, may contribute to moisture present, but the choice focusing on fog with limited visibility highlights a specific condition deemed most relevant under SOPM guidelines for visible moisture. Understanding this concept is vital for ensuring compliance with operational procedures, especially in conditions that may lead to increased risks during flight.