Balance of the water resources of a region, comparing precipitation and inflow with outflow, evaporation, and accumulation.

Wind with a speed between 22 and 27 knots (25 and 31 mph); Beaufort scale number 6.

A form of data transmission in which the bits of each character are all sent simultaneously, resulting in extremely fast communication but requiring a communication path for each bit. Compare to serial data transmission.

A precipitation gauge consisting of a receiver in the shape of a funnel which empties into a bucket mounted upon a weighing mechanism. The weight of the catch is recorded as inches of precipitation.

An instrument for the measurement of the radon content of the atmosphere.

Dihydrogen oxide, molecular formula H2O.

An apparatus, used in studying soil temperatures, for measuring the total supply of heat during a given period.

The element directly responsive to the value of the measured variable.

The measuring, transmitting, receiving, and indicating apparatus for obtaining the value of a quantity at a distance.

The distance or length of flow of the air past a point during a given interval of time.

A plastic molding component formed by the reaction of phenol and formaldehyde. It can be heavily reinforced or "filled" with glass fibers or other materials. Phenolics are known for their high impact strength, excellent wear characteristics, and dimension ...

The total of direct solar radiation and diffuse sky radiation received by a unit horizontal surface. Global radiation is measured by pyranometers.

An instrument designed to record the duration of sunshine at a given location without regard to intensity. See Campbell- Stokes recorder, Jordan sunshine recorder, Marvin sunshine recorder, Pers sunshine recorder.

A general term for instruments which sample atmospheric suspensoids by impaction. Same as impactometer.

See gain.

The ratio of the output of an instrument to the input value, i.e. a rain gauge with a sensitivity of 1 tip per 0.01"

Downward-facing pyranometer used for measuring reflected solar radiation.

A remote indicator for wind speed and direction used in conjunction with a contact anemometer and a wind vane. The indicator consists of a center light, connected to the contact anemometer, surrounded by eight equally spaced lights which are individually ...

The total luminous flux received on a unit area of a given real or imaginary surface, expressed in such units as the foot-candle, lux, or phot.

The range of operating conditions of a device within which operating influences are negligible. The range is usually narrow. Reference operating conditions are the conditions under which reference performance is stated and the base from which the values o ...