Also found in: Acronyms.
vertical visibility[′vərd·ə·kəl ‚vis·ə′bil·əd·ē]
According to United States weather observing practice, the distance that an observer can see vertically into a surface-based obscuring phenomenon, such as fog, rain, or snow.
The maximum height from which a pilot can recognize ground features when the surface is obscured because of a meteorological phenomenon. The distance one can see upward in similar conditions.