A method of winds aloft observation in which the elevation and azimuth angles of a theodolite are read while visually tracking a pilot balloon. Balloon height data is estimated from assumed balloon ascension rates.

A rainbow seen in the spray of the ocean. It is optically the same phenomenon as the ordinary rainbow.

Occupational Safety and Health Administration. A regulatory office of the U.S. Department of Labor.

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

Temperature assumed by an unsaturated air parcel when brought adiabatically to a standard pressure (1,000 mb).

Downward-facing pyranometer used for measuring reflected solar radiation.

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).

Same as marine rainbow.

A device for obtaining a continuous record of stage at a point on a stream. The most common recorders consist of a float-actuated pen which traces a record on a clock driven chart.

The group of bits which a computer processes as a unit; often, 8 bits.

A measure, proposed by Angstrom, of the precipitation effectiveness of a region.

See standard atmosphere.

(1) The ratio of the speeds of a chemical reaction at two temperatures differing by 10

Automated Local Evaluation in Real Time. Network of automatic rain gauges that transmit via VHF radio link when precipitation occurs. Some sites are also equipped with other sensors such as temperature, wind, pressure, river stage or tide level. More info ...

An instrument for measuring the ultraviolet in solar and sky radiation.

Same as atmometer.

The direction toward which the wind is blowing; with the wind.

A thermometer consisting of a clock mechanism the speed of which is a function of temperature.

(1) The initial component or the sensing element of a measuring system. For example, the receiver of a rain gauge is the funnel which captures the rain and the receiver of a thermoelectric thermometer is the measuring thermocouple. (2) An instrument used ...

Any soft, gentle breeze.