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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved