A type of atmometer. It is a pan used in the measurement of the evaporation of water into the atmosphere. The NWS Class A pan is a cylindrical container 48 inches in diameter and 10 inches deep.

A counterclockwise change in wind direction. Backing winds with height are indicative of cold air advection (CAA).

That part of an audio-modulated radiosonde consisting of the baroswitch, the sensing elements, the reference elements, and the relay.

The record or trace made by a microbarograph.

A nephoscope in which the motion of the cloud is observed by its reflection in a mirror.

Same as marine rainbow.

Part of a computer word that has meaning in itself, often, a byte.

Amount of water, expressed as a depth or as a mass, which would be obtained if all the water vapor in a specified column of the atmosphere were condensed and precipitated.

Same as aneroid barometer. Holostelic means wholly made of solids, while aneroid means devoid of liquid.

The point (physical and/or electrical) where two distinct data processing elements meet.

Transistor-Transistor Logic.

A sunshine recorder of the type in which the time scale is supplied by a chronograph. It consists of two bulbs, one of which is blackened, which communicate through a glass tube of small diameter. The tube is partially filled with mercury and contains two ...

An instrument which determines the altitude of an object with respect to a fixed level. There are two general types of altimeters: (a) the pressure altimeter, which gives an approximate measure of altitude from a pressure measurement and an assumed standa ...

A device for computing certain psychrometric data, usually the dew point and the relative humidity, from known values of the dry-bulb and wet-bulb temperatures and the atmospheric pressure. One type is the circular slide-rule form and, like the psychromet ...

A metallic element of atomic weight 200.6 1, unique (for metals) in that it remains liquid under all but very extreme temperatures.

Air in motion relative to the surface of the earth. Almost exclusively used to denote the horizontal component.

A fixed-length group of bits representing the large data element handled as a unit by a computer. Word length is determined by the capacity of the CPU registers.

An instrument for the measurement of the rate of ice accretion on an unheated body.

Thermometer for measuring the temperature in the soil at different depths.

Wind with a speed between 28 and 55 knots (32 and 63 mph); Beaufort scale numbers 7 through 10.