An early and once universal name for the mercury barometer.

Wind with a speed between 4 and 27 knots (4 and 31 mph); Beaufort scale numbers 2 through 6.

Fine dust or salt particles dispersed through a portion of the atmosphere; a type of lithometer. The particles are so small they cannot be felt or seen with the naked eye. Many haze formations are caused by the presence of an abundance of condensation nuc ...

A large plastic constant-level balloon for duration flying (in excess of 24 hours) at altitudes above 40,000 feet, used for the determination of wind fields and the measurement of upper atmospheric parameters.

An instrument for the measurement of the radon content of the atmosphere.

Complementary Metal-Oxide Semiconductor. A method of making silicon chips that results in low power consumption by the circuits.

A hygrometer in which the sensitive element is a strand or strands of human hair, the length of which is a function of the relative humidity of the air.

A forecast of the expected stage or discharge at a specified time, or of the total volume of flow within a specified Interval of time, at one or more points along a stream.

A cover which fits over a large inflated balloon to facilitate handling in high or gusty winds.

An instrument for measuring the relative speed of a fluid. It consists of a concentric pipe arrangement in which the inner pipe is open at one end and the outer pipe is perforated and closed at both ends. Each pipe is connected to a manometer. The unit is ...

See approximate absolute temperature scale, Celsius temperature scale, centigrade temperature scale, Fahrenheit temperature scale, Kelvin temperature scale, Rankine temperature scale, Reaumur temperature scale,

Transistor-Transistor Logic.

A line drawn through geographical points having the same pluvial index.

The difference between temperature measurements taken at two significant levels above the ground. Temperatures at 10 and 40 meters are commonly used.

Very generally, any moving- stream of air. It has no particular technical connotation.

Anemometer which generates an electrical contact output with a frequency proportional to wind speed.

One of several constant-pressure levels in the atmosphere for which a complete evaluation of data derived from upper air observations is required.

General name for an instrument which measures the earth's magnetic field intensity.

An instrument for measuring the frost point of the atmosphere.

The range through which the input may be varied without initiating a response. Usually expressed as a percentage of full-scale range.