Same as contact anemometer.

in United States weather observing practice, the highest "instantaneous" wind speed recorded at a station during a specified period, usually the 24-hour observation day. Therefore, a peak gust need not be a true gust of wind.

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 device for measuring the frequency of occurrence of atmospherics whose intensity is greater than a predetermined level.

Same as wind sock.

Same as mirror nephoscope.

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.

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 ...

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

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

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

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

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

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

Difference between the instantaneous wind velocity at a point and the mean wind velocity taken over a given time interval. Also called fluctuation velocity.

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.

A very sensitive electrostatic electrometer for measuring small potential differences.

A device for measuring sea-surface waves. It consists of a weighted pole below which a disk is suspended at a depth sufficiently deep for the wave motion associated with deepwater waves to be negligible. The pole will then remain nearly as if anchored to ...

A radiosonde which transmits the indication of the meteorological sensing elements in the form of a code consisting of combinations of dots and dashes.