A general term for instruments designed to measure the amount of cloudiness.

The ratio of the amount of electromagnetic radiation reflected by a body to the amount incipient upon it, commonly expressed as a percentage. The albedo is to be distinguished from the reflectivity, which refers to one specific wavelength.

In general, pertaining to or affording an overall view. In meteorology, this term has become somewhat specialized in referring to the use of meteorological data obtained simultaneously over a wide area for the purpose of obtaining a comprehensive and near ...

A thermograph in which ventilation is provided by a suction fan.

See evaporation pan.

An empirical curve relating stream discharge or stage at a point on a stream to discharge or stage at one or more upstream points and, possibly. to other parameters. Also called stage relation.

Same as mirror nephoscope.

Same as wind sock.

A graphical aid used in fire weather forecasting to calculate the degree of forest-fire danger (or burning index). Commonly in the form of a circular slide rule, the firedanger meter relates numerical indices of (a) the seasonal stage of foliage, (b) the ...

A decrease in the central pressure of a pressure system. Usually applied to a low rather than to a high.

A hypothetical "body" whose surface absorbs no electromagnetic radiation of any wavelength. An idealization exactly opposite to that of the black body. In nature, no true white bodies are known. Moist white pigments exhibiting high reflectivity for visibl ...

Any one of numerous devices for the measurement of either speed alone or of both direction and speed (set and drift) in flowing water.

The standard deviation (positive square-root of the variation) of the errors associated with physical measurements of an unknown quantity, or statistical estimates of an unknown parameter or of a random variable.

Part of a computer word that has meaning in itself, often, a byte.

A rain gauge capable of measuring very small amounts of precipitation. Also called micropluviometer, trace recorder.

General term for an instrument used to make direct measurements of visual range or measurements of the physical characteristics of the atmosphere which determine the visible range.

Same as windsock.

Video Display Terminal. An input and display device which includes a keyboard and a screen and allows a human to communicate with a computer.

A very sensitive electrostatic electrometer for measuring small potential differences.

A thermometer consisting of a clock mechanism the speed of which is a function of temperature.