An absolute temperature scale with the ice point of pure water defined as 273.16 K. The size of the degree is the same as on the Celsius scale, and the zero point is absolute zero.

The most common of the principal rainbow phenomena, which appears as an arc of about 42

A recording siphon barometer.

See stage.

The height at which the maximum wind speed occurs, determined in a winds-aloft observation.

Pertaining to the action or effect of the wind. Derived from the name of the Greek god of the winds, Aeolus.

A device that allows a terminal or computer at one location to communicate with a terminal or computer at a distant location via wire or phone lines.

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).

See radiation shield.

In a radiosonde observation, a level (other than a standard level) for which values of pressure, temperature, and humidity are reported because temperature and/or humidity data at that level is sufficiently important or unusual to warrant the attention of ...

Generally, an instrument designed to measure or estimate the blueness of the sky. See Linke-scale.

A unit of luminance (or brightness) equal to 1/6 candles per square centimeter.

Of or pertaining to rain.

Ice crystal deposits formed by sublimation (conversion of water vapor directly to ice) when temperature and dew point are below freezing.

The ratio of the existing amount of water vapor in the air at a given temperature to the maximum amount that could exist at that temperature. Usually expressed in percent.

The outer, solid portion of the earth: the crust of the earth.

A type of precipitation composed of unbranched crystals in the form of needles, columns, or plates. Usually has a very slight downward motion and may fall from a cloudless sky.

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

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

A general name for instruments which detect the presence of (but do not necessarily measure) small electrical charges by electrostatic means. Compare to electrometer.