Plain English Meaning

Everything outside the airplane looks like one solid white sheet. The pilot can no longer tell where the ground is, where the sky is, or how the aircraft is moving in relation to them.

Full Definition

A visibility condition, usually associated with snow-covered terrain or low cloud over snow, in which the horizon disappears and surface features blend into a uniform white field, eliminating the visual references a pilot needs to judge attitude, altitude, and motion.

Context Anchor

Seen in and - discussions, especially around snow-covered terrain, , , , or low-contrast lighting.