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 hygrometer which determines the amount of precipitable moisture in a given region of the atmosphere by measuring attenuation of radiant energy caused by the absorption bands of water vapor.

A rain gauge which automatically records the amount of precipitation collected, as a function of time.

Anemometer which measures wind speed by the speed of rotation of 3 or 4 hemispherical or conical cups, each fixed to the end of a horizontal arm projecting from a vertical axis. See condenser-discharge anemometer, contact anemometer. Compare to bridled-cu ...

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

Growth of a cloud or precipitation particle by the collision and union of a frozen particle with a super-cooled water drop.

The change in the measured transducer output caused by changes in ambient temperature. Usually expressed a percentage of full scale.

The difference between temperature measurements taken at two significant levels above the ground. Temperatures at 10 and 40 meters are commonly used.

As used by the U.S. Army Corps of Engineers, the departure (in

Read Only Memory. A memory that cannot be altered in normal use of a computer, Usually used to store information permanently, such as firmware programs.

In a radiosonde observation, a level (other than a standard level) for which values of pressure, temperature, and humidity are reported because temperature and/or humidity data at that level is sufficiently important or unusual to warrant the attention of ...

A radiosonde whose carrier wave is switched on and off in such a manner that the interval of time between the transmission of signals if a function of the magnitude of the meteorological elements being measured.

A system of estimating and reporting wind speed, originally based on the effect of various wind speeds on the amount of canvas that a full-rigged nineteenth century frigate could carry.

A clock-driven instrument mounting which automatically and continuously points in the direction of the sun. It is used with a pyrheliometera,hen continuous direct solar radiation measurements are required.

The temperature at which an object gives out as much radiation as it receives from its surroundings.

The point (physical and/or electrical) where two distinct data processing elements meet.

A photometer which measures the intensity of radiation as a function of the frequency (or wavelength) of the radiation.

A rainbow of angular radius of about 50

Instrument for measuring the intensity of radiant energy. Its principle is based on the variation of electrical resistance, with the incoming radiation, of one or both the metallic strips which the instrument comprises.

A system of physical units based on the use of the centimeter, gram. and the second as elementary quantities of length. mass. and time.