Which of the following is included in the definition of Visible Moisture?

• A. Fog with visibility of one mile or less, mist, rain, snow, sleet, and ice crystals or clouds in flight
• B. Smoke in the cabin
• C. Dust particles on the runway
• D. No moisture present

Answer: (A)

Visible moisture means weather phenomena you can see in the air that affect how far you can see. Fog, mist, rain, snow, sleet, and ice crystals—or clouds seen in flight—are all moisture in the atmosphere that you can observe, so they fit the definition. That’s why the group described—fog with limited visibility plus the listed types of precipitation and ice crystals or clouds—is the correct match. Smoke in the cabin isn’t moisture in the surrounding air, it’s a contaminant inside the cabin. Dust on the runway is surface particles, not moisture in the air. And no moisture present is simply the absence of moisture.