In radiometry, a measure of the intrinsic radiant intensity emitted by a radiator in a given direction.

modulated radiosonde-A radiosonde which transmits the indications of the meteorological sensing elements in the form of pulses spaced in time. The meteorological data are evaluated from the intervals between the pulses. Also called timeinterval radiosonde ...

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

For a given cloud or cloud laver. the lowest level in the atmosphere at which the air contains a perceptible quantity of cloud particles.

A recording variometer.

Wind with a speed between 11 and 16 knots (13 and 18 mph); Beaufort scale number 4.

A type of cistern barometer in which the level of mercury in the cistern is adjusted to the zero point of the scale before each reading.

Atmospheric layer throughout which there is no change of temperature with height, i.e. a zero lapse rate.

A curve showing the variation of temperature with height in the free air. See lapse rate.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

A type of electrical thermometer consisting of two thermocouples which are series-connected with a potentiometer and a constant-temperature bath. One couple, called the reference junction, is placed in a constant-temperature bath, while the other is used ...

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 ...

The value of the quantity measured, as indicated or otherwise provided by a measuring instrument.

A measure of long-term precipitation effectiveness. The ratio of the normal annual rainfall to the normal annual evaporation.

A hygrometer in which the rotation of the hygrometric element is a function of humidity.

Same as rain-intensity gauge.

A line drawn through geographical points having the same pluvial index.

Abbreviation for precipitation-evaporation quotient.

An instrument for measuring angles of inclination. Used in conjunction with a ceiling light to measure cloud height at night.

See mote.