Any device or instrument for measuring salinity, especially one based on electrical conductivity methods.

An instrument used to reveal but not necessarily measure the presence of an electrical quantity. It is used to display the output of a sensing element after suitable amplification and modification. Sometimes called display.

The statement that the viscosity of air is independent of the density of air.

NEXt Generation RADar. A NWS network of about 140 Doppler radars operating nationwide.

The stage on a fixed river gauge at which it is necessary to begin issuing warnings or river forecasts if adequate precautionary measures are to be taken before flood stage is reached.

A method of winds aloft observation accomplished by tracking a balloon-borne radar target or radiosonde with either radar or a radio theodolite.

Extended Binary Coded Decimal Interchange Code. A standard code used to represent data using 8 bits per character.

A halo consisting of a faint white circle passing through the Sun and running parallel to the horizon for as much as 360

The direction, with respect to magnetic north, from which the wind is blowing. Distinguish from true wind direction.

Same as marine rainbow.

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

A point (or line) on a scale used for reference or comparison purposes. In calibration of meteorological thermometers, for example, the fiducial points are 100

The distance that an observer can see vertically into a surface-based obscuring phenomenon such as fog, rain, or snow. The distance estimate must be based upon ceiling balloon ascensions or ceiling light projector measurements.

The correctable part of the inaccuracy of an instrument.

See evaporative opportunity.

A type of pressure-plate anemometer in which the plate, restrained by a stiff spring, is held perpendicular to the wind. The wind-activated motion of the plate is measured electrically. The natural frequency of this system can be made high enough so that ...

An instrument for determining the direction from which radio waves approach a receiver. It may consist of a manually operated direction indicator, or it may use a servo system to position the antenna automatically in the direction of the incident waves.

Same as instrument shelter.

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

A common type of liquid-inglass thermometer, used, in meteorology, in psychrometers and as a maximum thermometer.