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

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

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

An instrument whose calibration is determined by comparison with an absolute instrument.

Same as atmometer.

A protective coating applied to circuits.

Complementary Metal-Oxide Semiconductor. A method of making silicon chips that results in low power consumption by the circuits.

General term for an instrument which records the vertical electric current in the atmosphere.

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.

A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.

A temperature scale with the ice point at 273 degrees and boiling point of water at 373 degrees. It is intended to approximate the Kelvin temperature scale with sufficient accuracy for many sciences, notably meteorology.

An instrument, for the recording of two or more meteorological parameters, in which the ventilation is provided by a suction fan.

The maximum difference in output for any given input (within the specified range) when the value is approached first with increasing, and then with decreasing, input signals. Caused by energy absorption in the elements of the measuring instrument. Usually ...

Thermometer used for measuring the highest temperature attained during a given interval of time, for example, a day.

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

A relatively small-scale, upward moving current of air.

An automatic, recording cloud height indicator.

An ice coating with a consistency intermediate between glaze and rime.

A numbering system using a base number of 2 and having only two digits: 0 and 1. The fundamental system of representing information with electrical pulses.

The standard deviation of a sufficiently large number of measurements of the same quantity by the same instrument or method. The non-correctable part of the inaccuracy of an instrument, it represents the limit of measurement precision. The uncertainty of ...