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

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).

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

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

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

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

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

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.

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 whose calibration is determined by comparison with an absolute instrument.

Readily taking up and retaining moisture.

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

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.

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

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.

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.

The record obtained from a bolometer.