Reduction of visibility by strong winds blowing across dry ground with little or no vegetation. Visibilities of 1/8 mile or less over a widespread area are criteria for a Blowing Dust Advisory.

Name sometimes given to a transmissometer.

A thin metal disc partially evacuated of air used to measure atmospheric pressure by measuring its expansion and contraction.

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

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

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.

General term for an instrument which records the vertical electric current in the atmosphere.

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 ...

An instrument used for the measurement of the reflecting, power (the albedo) of a surface. A pyranometer adapted for the measurement of radiation reflected from the earth's surface is sometimes employed as an albedometer.

The envelope of air surrounding the earth and bound to it more or less permanently by virtue of the earth's gravitational attraction. The system whose chemical Properties. dynamic motions, and physical processes constitute the subject matter of meteorolog ...

See evaporation pan.

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

The ratio of the amount of electromagnetic radiation reflected by a body to the amount incipient upon it, commonly expressed as a percentage. The albedo is to be distinguished from the reflectivity, which refers to one specific wavelength.

Infrared radiation emitted by or being propagated through the atmosphere.

A temperature scale with the ice point at 273 degrees and boiling point of water at 373 degrees. It is intended to approximate the Kelvin temperature scale with sufficient accuracy for many sciences, notably meteorology.

The older name for the Celsius temperature scale. Officially abandoned by international agreement in 1948, but still in common use.

A unit of energy equal to 101 ergs or to 0.2389 calories.

The total of all deviations of a transducer's output from a specified straight line in a constant environment.

Interational thermometric scale on which the freezing point of water equals 0

Same as wind sock.