Which statement best defines Visible Moisture?

• A. Fog with visibility of 1 mile or less, rain, snow, sleet, or ice crystals
• B. Any cloud with moisture
• C. Haze with visibility greater than 6 miles
• D. Any visible liquid on the runway

Answer: (A)

Visible moisture is the moisture you can actually see in the air that reduces how far you can see. Fog and precipitation are classic examples of this, since they directly affect visibility. The best choice captures that by listing fog (with very low visibility) and common forms of visible precipitation—rain, snow, sleet, and ice crystals. These are the moisture phenomena pilots must recognize when visibility is degraded. The other options describe conditions that aren’t about moisture in the air affecting visibility: clouds are moisture too but aren’t described here as visible moisture for this purpose; haze is about air clarity at higher visibility; and liquid on the runway is a surface condition, not atmospheric moisture.