Rain gauge which registers precipitation that is too light to be registered by ordinary recording of the depth of water from precipitation. Same as ombrometer.

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

Contraction for radiosonde observation.

An aviation weather forecast for a specific flight.

Radio Direction Finder.

A special form of the aspiration psychrometer. developed by Assmann, in which the thermometric elements are well shielded from radiation. Psychrometric measurements may be taken with the instrument in the presence of direct solar radiation.

An instrument used to measure the amount of dew formed on a given surface.

Literally "not wet", containing no liquid.

A device that combines several separate communications signals into one and outputs them on a single line.

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.

A clock-driven instrument mounting which automatically and continuously points in the direction of the sun. It is used with a pyrheliometera,hen continuous direct solar radiation measurements are required.

A hypothetical "body" whose surface absorbs no electromagnetic radiation of any wavelength. An idealization exactly opposite to that of the black body. In nature, no true white bodies are known. Moist white pigments exhibiting high reflectivity for visibl ...

A temperature scale on which the freezing point of water equals 32

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.

A number of quantity defining a limit that errors will not exceed when a device is used under specified operating conditions. Accuracy rating can be expressed in a number of forms, i.e. in terms of the measured variable (+/- 1 C), percent of span (+/-0.5% ...

A instrument designed to study small fluctuations of some quantity. The microbarograph is an example of a recording pressure variometer.

Wind with a speed between 48 and 55 knots (55 and 63 mph), Beaufort scale number 10.

check chamber-A chamber use to check the sensing elements of radiosonde equipment.

A line drawn through geographical points having the same duration of sunshine (or other function of solar radiation) during a given interval of time.

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 ...