Defect in the action of an aneroid barometer resulting in a sluggish adjustment of the index toward the correct reading when the barometer is subjected to a large and rapid change in pressure.

A pyranometer developed by M. Robitzsch. Its design utilizes three bimetallic strips which are exposed horizontally at the center of a hemispherical glass bowl. The outer strips are white reflectors and the center strip is a blackened absorber. The bimeta ...

Literally "not wet", containing no liquid.

A systematic summary of the terms (inflow, outflow, and storage) of the storage equation as applied to the computation of soil-moisture changes, ground-water changes, etc. An evaluation of the hydrologic balance of an area. Also called basin accounting, w ...

The rate of decrease of pressure per unit distance at a fixed time.

An addition to a rawinsonde system which allows determination of the slant range to the radiosonde.

A measure of the attenuation due to scattering, of light as it traverses a medium containing scattering particles.

See Koschmieder's law.

Name applied to a class of instruments which measure the liquid content of the atmosphere.

Strong winds concentrated within a narrow band in the atmosphere. The jet stream often "steers" surface features such as front and low pressure systems.

bucket rain gauge-A rain gauge where the precipitation collected by the receiver empties into one side of a chamber which is partioned transversely at its center and is balanced bistably upon a horizontal axis. When a predetermined amount of water has bee ...

A device attached to a meteorological instrument to provide ventilation; usually a suction fan.

Of or pertaining to rain.

An instrument which automatically determines the size distribution of raindrops.

An element that can control current without moving parts, heated filaments, or vacuum gaps.

The addition of one or more redundant bits to information to verify its accuracy.

A modification of the dew cell used in radiosonde equipment.

Technically, the temperature registered by the dry-bulb thermometer of a psychrometer. However, it is identical with the temperature of the air and may also be used in that sense.

Any and all forms of water particles, liquid or solid, that fall from the atmosphere and reach the ground.

An instrument which measures the instantaneous rate at which rain is falling on a given surface. Also called a rate-of-rainfall gauge.