Solar radiation of selected wavelengths.

The height ascribed to the lowest layer of clouds or obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as "thin" or "partial." The ceiling is termed unlimited when these conditions are not satisfied. ...

A type of cyanometer. an instrument used to measure the blueness of the sky. The Linke-scale is simply a set of eight cards of different standardized shades of blue. They are evenly numbered 2 to 26. The odd numbers are used by the observer if he or she j ...

The difference between amounts of precipitation and runoff for a given storm. It is that portion of the precipitation that remains in the basin as soil moisture, surface storage, ground water, etc.

A graphical representation of a frequency distribution. The range of the variable is divided into class intervals for which the frequency of occurrence is represented by a rectangular column. The height of the column is proportional to the frequency of ob ...

The time required for an instrument to register a designated percentage (frequently 90%) of a step change in the variable being measured.

Same as contact anemometer.

A common unit used in measurement of atmospheric pressure. Defined as that pressure exerted by a one-inch column of mercury at standard gravity and a temperature of 0'C.

An instrument which records the duration of sunshine and gives a quantitative measure of the amount of sunshine by the action of the sun's rays upon blueprint paper. A type of sunshine recorder.

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

An instrument that shows changes in humidity.

A unit of energy equal to 1.356joules.

A magnetometer of the electromagnetic type which is used to measure the horizontal intensity of the earth's magnetic field.

A system in which radar techniques are used to determine the range, elevation, and azimuth of a radar target carried a!oft by a radiosonde, so that wind data may be obtained along with the other meteorological data.

Name sometimes used in place of pyranometer as a generic term.

Any emission of light at temperatures below that required for incandescence.

The ratios, to the mean wind speed, of the average magnitudes of the component fluctuations of the wind along three mutually perpendicular axes.

The effect upon the measurement of rainfall caused by the presence of the rain gauge.

A thermograph in which ventilation is provided by a suction fan.

Same as instrument shelter.