A small balloon used to determine the height of the cloud base. The height can be computed from the ascent velocity of the balloon and the time required for its disappearance into the cloud.

A method of upper air observation consisting of an evaluation of the wind speed and direction, temperature, pressure, and humidity aloft by means of a balloon-borne radiosonde tracked by radar or a radio theodolite.

An instrument used to indicate wind direction.

An instrument developed by K. Angstrom for measuring the effective terrestrial radiation. It consists of four manganin strips, of which two are blackened and two are polished. The blackened strips are allowed to radiate to the atmosphere while the polishe ...

Same as mirror nephoscope.

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.

A radiosonde which transmits the indication of the meteorological sensing elements in the form of a code consisting of combinations of dots and dashes.

An instrument for recording global solar radiation.

A hypothetical, ideal body which absorbs completely all incident radiation. independent of wavelength and direction. No actual substance behaves as a true black body, although platinum black and other soots rather closely approximate this ideal. However, ...

A photometer that measures the received intensity of a distance tight source.

A series of Nansen-bottle water samples and associated temperature observations resulting from one release of a messenger.

General name for an instrument which measures the earth's magnetic field intensity.

A wave resulting from the action of wind on a water surface.

Same as radiation pattern. Anticyclone-An area of high atmospheric pressure which has a closed circulation that is anticyclonic (clockwise in northern hemisphere and counterclockwise in southern hemisphere).

In folklore, a name for wind.

The interval between the lower and upper measuring limits of an instrument, i.e. a thermometer with a range of -35 to 50

The array of indicating marks and figure in relation to which the position of an index is observed, i.e. a scale plate on a recorder.

Same as instrument shelter.

Upwarddirected solar radiation, reflected by the earth's surface and the atmosphere.

Name given to the unit of pressure in the International System of Units (SI). Equal to 1 newton/meter2 or 0.01 millibar.