That temperature at which, in a specified latitude, the reading of a particular barometer requires no temperature or latitude correction.

Very generally, any moving- stream of air. It has no particular technical connotation.

The effect upon the measurement of rainfall caused by the presence of the rain gauge.

The rate of decrease of temperature with height when unsaturated air is lifted adiabatically (without exchange of heat with its surroundings). The decrease is due to expansion as the air is lifted to a lower pressure.

The amount of moisture which, if available, would be removed from a given land area by evapotranspiration. Expressed in units of water depth.

Diffuse solar radiation which has the same intensity in all directions.

modulated radiosonde-A radiosonde which transmits the indications of the meteorological sensing elements in the form of pulses spaced in time. The meteorological data are evaluated from the intervals between the pulses. Also called timeinterval radiosonde ...

The transducer's output when the maximum sensed value is applied to the transducer's input. For example, the F.S. output of a 4-20 mA transmitter is 20 mA, whereas its span is only 16mA.

An evaporation pan in which the evaporation is measured from water in a pan floating in a larger body of water.

The atmospheric pressure at the level of the barometer. May or may not be the same as station pressure.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

See river basin.

In nautical terminology, a contraction for "weather glass" (a mercury barometer).

The gravity flow of water within soil.

Atmospheric layer throughout which there is no change of temperature with height, i.e. a zero lapse rate.

See ceilometer.

A radiosonde which is dropped by parachute from an aircraft for the purpose of obtaining soundings of the atmosphere below.

An instrument which measures the scattering function of particles suspended in a medium in order to determine the visual range through the medium. See visibility meter.

Generally, the relative states of inflow, outflow, and storage of moisture over a given area of earth's surface.

Formation of a single water drop by the union of two or more colliding drops.