The cardinal points of the compass, i.e. north, south, east, west.

See aneroid capsule.

The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question.

The height ascribed to the lowest layer of clouds or obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as "thin" or "partial." The ceiling is termed unlimited when these conditions are not satisfied. ...

An instrument for the measurement of both solar and terrestrial radiation.

An ion counter of the aspiration condenser type, used for the measurement of the concentration and mobility of small ions in the atmosphere.

A general term for instruments designed to measure the speed or force of the wind.

Operation mode of a communication circuit in which each end can transmit and receive, but not simultaneously.

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.

For a given cloud or cloud laver. the lowest level in the atmosphere at which the air contains a perceptible quantity of cloud particles.

An area of low atmospheric pressure which has a closed circulation that is cyclonic (counterclockwise in northern hemisphere and clockwise in southern hemisphere).

A recording anemometer.

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.

The general term for anemometers operating on the principle that the heat transfer to air from an object at an elevated temperature is a function of the air speed. Examples are the hot-wire anemometer and the katathermometer.

A wind vane used to obtain the horizontal and vertical components of the wind.

An instrument for collecting liquid water from the atmosphere.

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

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

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

Same as atmometer.