The temperature to which a sample of air must be cooled, while the mixing ratio and barometric pressure remain constant, in order to attain saturation by water vapor. When this temperature is below O

An instrument for measuring radiant energy. See actinometer, Dines radiometer, photometer, Tulipian radiometer.

General name for a type of instrument which measures the inclination of the wind to the horizontal plane. See bivane.

The humidity transducinu element in a Diamond-Hinman radiosonde. Also called electrolytic strip.

A small pointer extending downward from the top of the cistern of a Fortin barometer. The level of the mercury in the cistern is adjusted so that it just comes in contact with the end of the pointer, thus setting the zero of the barometric scale.

A basic equation in daytime visual range theory, relating the apparent luminance of a distant black object, the apparent luminance of the background sky above the horizon, and the extinction coefficient of the atmosphere, or the air layer near the ground. ...

Particle on which the freezing of water occurs.

A radiosonde whose carrier wave is modulated by audio-frequency signals whose frequency is controlled by the sensing elements of the instrument.

A plastic molding component formed by the reaction of phenol and formaldehyde. It can be heavily reinforced or "filled" with glass fibers or other materials. Phenolics are known for their high impact strength, excellent wear characteristics, and dimension ...

Wind with a speed between 56 and 63 knots (64 and 72 mph); Beaufort scale number 11.

Wind with a speed between 41 and 47 knots (47 and 54 mph); Beaufort scale number 9.

A photometer which measures the intensity of radiation as a function of the frequency (or wavelength) of the radiation.

A photometer that measures the received intensity of a distance tight source.

Of or pertaining to the air, atmosphere, or aviation. Also, same as antenna.

A buoyant balloon kept from rising freely by means of a line secured to a point on the ground, as opposed to a free balloon. See kytoon.

A rainbow seen in the spray of the ocean. It is optically the same phenomenon as the ordinary rainbow.

Phase Shift Keying. A form of phase modulation of a data signal performed by a modem for transmission over dedicated wire or phone lines.

See feed.

A device for obtaining a continuous record of stage at a point on a stream. The most common recorders consist of a float-actuated pen which traces a record on a clock driven chart.

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 ...