An instrument which measures the effective terrestrial radiation. See Angstrom pyrgeometer.

Same as balloon cover.

A colloquial term in western Australia for a squall, associated with thunder, on the northwest coast in summer.

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.

The source of illumination for an antenna reflector. Also called antenna feed.

A hygrometer in which the sensitive element is a strand or strands of human hair, the length of which is a function of the relative humidity of the air.

A radiosonde equipped to measure temperature only.

A class of rain gauge in which the level of the collected rain water is measured by the position of a float resting on the surface of the water.

The frequency of a carrier wave.

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

Apparatus from which the nature and time of precipitation may be determined.

The difference between the air temperature and the dew-point. Also called dew-point deficit, dew-point depression.

A form of data transmission in which the bits of each character are sent one at a time along a single communication path. Compare to parallel data transmission.

Anemometer which generates an electrical contact output with a frequency proportional to wind speed.

A wind (or component thereof) directed down the slope of an incline and caused by greater air density near the slope than at the same levels some distance horizontally from the slope. Also called drainage wind and sometimes called katabatic wind.

Any meteorological instrument, such as a radiosonde, in which the recording apparatus is located at some distance from the measuring apparatus.

An instrument for measuring differences of electric potential.

Solar and terrestrial radiation directed upward (away From the earth's surface); outgoing radiation.

The difference between the outgoing infrared terrestrial radiation of the earth's surface and the downcoming infrared counterradiation from the atmosphere.

An instrument for measuring the intensity of light or the relative intensity of a pair of lights. Also called an illuminometer. If the instrument is designed to measure the intensity of light as a function of wavelength, it is called a spectrophotometer. ...