Infrared radiation emitted by or being propagated through the atmosphere.

An instrument for the measurement of both solar and terrestrial radiation.

The maximum difference in output for any given input (within the specified range) when the value is approached first with increasing, and then with decreasing, input signals. Caused by energy absorption in the elements of the measuring instrument. Usually ...

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

Wind with a speed between 7 and 10 knots (8 and 12 mph), Beaufort scale number 3.

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.

In folklore, a name for rain.

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

A recording variometer.

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.

A recording anemometer.

Temperature of equilibrium between the liquid and vapor phases of a substance at a given pressure.

Same as freezing point.

Anemometer which measures wind speed by the speed of rotation of 3 or 4 hemispherical or conical cups, each fixed to the end of a horizontal arm projecting from a vertical axis. See condenser-discharge anemometer, contact anemometer. Compare to bridled-cu ...

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 ...

Same as ceiling light.

A colloquial term in western Australia for a squall, associated with thunder, on the northwest coast in summer.

Central Processing Unit. The part of a computer which controls and directs all functions.

A radar term for a single pulse of radio energy.

An evaluation, according to set procedures, of those weather elements which are most important for aircraft operations. Always includes cloud height or vertical visibility, sky cover, visibility, obstructions to vision, certain atmospheric phenomena, and ...