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

Infrared radiation emitted by or being propagated through the atmosphere.

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

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

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

Central Processing Unit. The part of a computer which controls and directs all functions.

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.

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

A recording anemometer.

A recording variometer.

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

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 ...

Wind with a speed between 7 and 10 knots (8 and 12 mph), Beaufort scale number 3.

Same as ceiling light.

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

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.

An instrument for measuring angles of inclination. Used in conjunction with a ceiling light to measure cloud height at night.

Same as freezing point.

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.

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 ...