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

Same as constant-level balloon.

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

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.

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

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.

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

In meteorology, a deflecting force acting on a body in motion and resulting from the earth's rotation. It deflects air currents to the right in the northern hemisphere and to the left in the southern hemisphere, thus having an effect on wind direction.

Infrared radiation emitted by or being propagated through the atmosphere.

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.

A system of physical units based on the use of the centimeter, gram. and the second as elementary quantities of length. mass. and time.

The record obtained from a bolometer.

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

The effect upon the measurement of rainfall caused by the presence of the rain gauge.

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 photographing the corona and prominences of the sun at times other than at solar eclipse.

A unit of energy per unit area commonly employed in radiation theory. Equal to one gram-calorie per square centimeter.

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

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

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