Same as atmometer.

A unit of energy per unit area commonly employed in radiation theory. Equal to one gram-calorie per square centimeter.

A liquid-in-metal thermometer in which mercury is enclosed in a steel envelope. The change in internal pressure caused by the temperature variation is measured by a Bourdon tube which is connected to the mercury by a capillary tube. This instrument is hig ...

A general term to designate apparatus designed to observe the details of weather during thunderstorms.

An instrument for recording ocean waves. Most recorders are designed for recording wind waves, that is waves of periods up to about 25 seconds, but some are designed to record waves of longer periods such as tsunamis or tides.

Clouds which cover between 6/10 and 9/10 of the sky. See Sky Terminology.

An instrument for photographing the corona and prominences of the sun at times other than at solar eclipse.

An instrument, located at the surface observing station, which is used to record the data presented by a radiosonde aloft.

An instrument which indicates the presence of precipitation. The ombroscope consists of a heated, water-sensitive surface which indicates by mechanical or electrical techniques the occurrence of precipitation.

An instrument for collecting liquid water from the atmosphere.

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

A Sunshine recorder of the type in which the time scale is supplied by the motion of the sun. The instrument, which is pointed at the celestial pole, consists of a hemispherical mirror mounted externally on the optical axis of a camera. The lens of the ca ...

The process by which events in the real world are translated into machine-readable signals.

American Standard Code for Information Interchange. A standard code used to represent data using 8 bits (7 data bits and I parity bit) per character.

The maximum distance along the runway at which the runway lights are visible to a pilot at touchdown. Runway visual range may be determined by an observer located at the end of the runway, facing in the direction of landing, or by means of a transmissomet ...

In meteorology, a deflecting force acting on a body in motion and resulting from the earth's rotation. It deflects air currents to the right in the northern hemisphere and to the left in the southern hemisphere, thus having an effect on wind direction.

A protective coating applied to circuits.

A device attached to a meteorological instrument to provide ventilation; usually a suction fan.

The rising of cold water from the deeper areas of the ocean to the surface. This phenomena often occurs along the California coast during the spring and summer.

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).