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.

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

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.

Lacking a relationship to a time base or clock. In asynchronous communications, individual data characters are sent at an arbitrary rate.

The record obtained from a bolometer.

Same as constant-level balloon.

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

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

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

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.

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

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

Readily taking up and retaining moisture.

A definite portion of a stream channel, commonly taken between two gauging stations, but may be taken between any two specified points.

The envelope of air surrounding the earth and bound to it more or less permanently by virtue of the earth's gravitational attraction. The system whose chemical Properties. dynamic motions, and physical processes constitute the subject matter of meteorolog ...

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

A reversing thermometer (for seawater temperature) which is not protected against hydrostatic pressure. The mercury bulb is therefore squeezed, and the amount of mercury broken off on reversal is a function of both temperature and of hydrostatic pressure.

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