The succession of stages through which water passes on the ground and in the atmosphere: evaporation from land or bodies of water, condensation to form clouds, precipitation, accumulation in the soil or in bodies of water, and re-evaporation.

An air-launched balloon designed to be released in the eye of a tropical cyclone, float within the eye at predetermined levels, and transmit radio signals for RDF positioning.

Same as rain-intensity gauge.

The record made by a hygrograph.

Operation mode of a communication circuit in which each end can transmit and receive, but not simultaneously.

A unit measure of electrical conduction. The facility with which a substance conducts electricity, as represented by the current density per unit electrical-potential gradient in the direction of flow. Electrical conductivity is the reciprocal of electric ...

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.

Facing away from the wind.

A mercury barometer which measures atmospheric pressure by weighing the mercury in the column or cistern.

An evaluation of upper air temperature, pressure, and humidity from radio signals received from a balloon- borne radiosonde.

A radar which is used to obtain the azimuth elevation, and slant range of an airborne target.

The water portion of the earth as distinguished from the solid part, called the lithosphere, and from the gaseous outer envelope, called the atmosphere.

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

One of several constant-pressure levels in the atmosphere for which a complete evaluation of data derived from upper air observations is required.

A graduated scale placed in a position so that the stage of a stream may be read directly from it. Staff gauges may be placed on bridge piers or pilings, etc., or placed on specially constructed supports.

Name sometimes used in place of pyranometer as a generic term.

Any sudden and heavy rain, almost always of the shower type.

The maximum difference in output for any given input (within the specified range) when the value is approached first with increasing, and then with decreasing, input signals. Caused by energy absorption in the elements of the measuring instrument. Usually ...

Rate of wind movement in distance per unit time.

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. T ...