That horizontal wind velocity at which the Coriolis acceleration exactly balances the horizontal pressure force. It is directed along contour lines or isobars.

The difference between the input quantity applied to a measuring instrument and the output quantity indicated by the instrument. The inaccuracy of an instrument is equal to the sum of its instrument error and its uncertainty.

Cathode Ray Tube. A display element, consisting of a vacuum tube and screen, used with computers.

A graphical device used for the determination of the speed of the geostrophic wind from the isobar or contour-line spacing on a synoptic chart.

An air-launched balloon designed to be released in the eye of a tropical cyclone, float within the eye at predetermined levels, and transmit radio signals for RDF positioning.

A definite portion of a stream channel, commonly taken between two gauging stations, but may be taken between any two specified points.

An instrument for determining the dust content of a sample of air. Also spelled conimeter.

An instrument that automatically records pressure and temperature.

An inert gas. An element found in the atmosphere to the extent of only 0.000114 percent by volume. Its molecular weight is 83.7.

A common type of liquid-inglass thermometer, used, in meteorology, in psychrometers and as a maximum thermometer.

In folklore, a name for wind.

A device which converts energy from one form into another, i.e. an ac generator transducer which converts the mechanical motion of anemometer cups into an electrical signal.

Navy Operational Global Atmospheric Prediction System. A global meteorological model operated by the Department of Defense.

A measure of luminous flux remaining in a light beam after it has passed through a specified distance of the atmosphere.

The transducer of any hygrometer, i.e. that part of a hygrometer that quantitatively "senses" atmospheric water vapor.

A hygrometer which includes an arrangement for the time recording of atmospheric humidity.

In physics, any process in which the flux density (or power, amplitude, intensity, illuminance, etc.) of a "parallel beam" of energy decreases with increasing distance from the source. Attenuation is always due to the action of the transmitting medium its ...

Contraction for pilot balloon observation.

Atmospheric layer throughout which there is no change of temperature with height, i.e. a zero lapse rate.

A scale of yellows, greens, and blues for recording the color of sea water, as seen against the white background of a Secchi disk.