Aeronautical Terms beginning with G

Glaze

A coating of ice, generally clear and smooth, formed by freezing of super.cooled water on a surface.

Gradient

In meteorology, a horizontal decrease in value per unit distance of a parameter in the direction of maximum decrease; most commonly used with pressure, temperature, and moisture.

Ground clutter

Pertaining to radar, a cluster of echoes, generally at short range, reflected from ground targets.

Ground fog

In the United States, a fog that conceals less than 0.6 of the sky and is not contiguous with the base of clouds.

Gust

A sudden brief increase in wind; according to U.S. weather observing practice, gusts are reported when the variation in wind speed between peaks and lulls is at least 10 knots.