An increase or amplification. There are two general usages of the term in radar meteorology: (a) antenna gain (or gain factor) is the ratio of the power transmitted along the beam axis to that of an isotropic radiator transmitting the same total power; an ...

The average temperature of the air as indicated by a properly exposed thermometer for a given time period, usually a day, a month, or a year.

A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.

See calorie.

Line drawn through geographical points recording equal amounts of precipitation during a given time period or for a particular storm.

A recording hair hygrometer.

Overflowing by water of the normal confines of a stream or other body of water, or accumulation of water by drainage over areas which are not normally submerged.

Federal Aviation Administration.

The physical exposure of an instrument. The effect of immediate environment upon the representativeness of the measurements obtained by meteorological instruments is considerable and not always correctable. The purpose of the instrument shelter is to prov ...

See radar theodolite, radio direction-finder.

A radar which is used to obtain the azimuth elevation, and slant range of an airborne target.

Complementary Metal-Oxide Semiconductor. A method of making silicon chips that results in low power consumption by the circuits.

A colloquial term in western Australia for a squall, associated with thunder, on the northwest coast in summer.

See ceilometer.

Rate of wind movement in distance per unit time.

A method of winds aloft observation accomplished by tracking a balloon-borne radar target or radiosonde with either radar or a radio theodolite.

A large body of air having similar horizontal temperature and moisture characteristics.

That part of snow melt that reaches stream channels as runoff.

A rain gauge which indicates but does not record the amount of precipitation captured.

An instrument for measuring the ultraviolet in solar and sky radiation.