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.

Same as constant-level balloon.

Same as ceiling light.

Anemometer which measures wind speed by the speed of rotation of 3 or 4 hemispherical or conical cups, each fixed to the end of a horizontal arm projecting from a vertical axis. See condenser-discharge anemometer, contact anemometer. Compare to bridled-cu ...

Physical equipment used in data processing. Compare to firmware, software.

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

Instrument for measuring the intensity of radiant energy. Its principle is based on the variation of electrical resistance, with the incoming radiation, of one or both the metallic strips which the instrument comprises.

The direction from which the wind is blowing, measured in points of the compass or in azimuth degrees.

A small balloon, loaded with ballast and inflated so that it will explode at a predetermined altitude, which is attached to a larger balloon.

Reduction of visibility by strong winds blowing across dry ground with little or no vegetation. Visibilities of 1/8 mile or less over a widespread area are criteria for a Blowing Dust Advisory.

A unit of energy equal to 101 ergs or to 0.2389 calories.

An instrument of the aspiration condenser type which measures the concentration and mobility of small ions.

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.

A radar term for a single pulse of radio energy.

A balloon designed to float at a constant pressure level. This may be accomplished by a pressure valve which controls the release of ballast so as to maintain flight above a selected pressure level until the supply of ballast is exhausted. See Moby Dick b ...

A thin metal disc partially evacuated of air used to measure atmospheric pressure by measuring its expansion and contraction.

Temperature of equilibrium between the liquid and vapor phases of a substance at a given pressure.

A colloquial term in western Australia for a squall, associated with thunder, on the northwest coast in summer.

A recording variometer.

Infrared radiation emitted by or being propagated through the atmosphere.