Formation of a single water drop by the union of two or more colliding drops.

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

A severe weather condition characterized by low temperatures and strong winds bearing a great amount of snow, either falling or picked up from the ground.

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

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.

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

The correction applied to an instrument to account for the effect of temperature upon its response characteristics.

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.

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

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

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

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.

See calorie.

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

The value of atmospheric pressure to which the scale of a pressure altimeter is set so as to indicate airport elevation. The altimeter setting is included as part of an aviation weather observation.

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

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 ...

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 automatic, recording cloud height indicator.

Abbreviation for visual flight rules, but commonly used to refer to the relatively favorable weather and/or flight conditions to which these rules apply.