Any conventional barometer fitted with an extended scale so that atmospheric pressure measurements may be made at both high and low altitudes.

Wind with a speed between 28 and 33 knots (32 and 38 mph); Beaufort scale number 7.

In Jeffreys' classification, a wind for which the pressure force exactly balances the viscous force, in which the vertical transfers of momentum predominate.

The change in the measured transducer output caused by changes in ambient temperature. Usually expressed a percentage of full scale.

A mercury barometer which measures atmospheric pressure by weighing the mercury in the column or cistern.

Infrared radiation emitted by or being propagated through the atmosphere.

A halo consisting of a faint white circle passing through the Sun and running parallel to the horizon for as much as 360

An anemometer which measures wind speed by means of the properties of wind-borne sound waves. It operates on the principle that the propagation velocity of a sound wave in a moving medium is equal to the velocity of sound with respect to the medium plus t ...

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

An absolute temperature scale with the degree of the Fahrenheit scale and the zero point of the Kelvin scale. The freezing point of water equals 491.69

In meteorology, an area of low pressure; a low or trough.

An automatic, recording cloud height indicator.

A recording pressure-tube anemometer in which the wind scale of the float manometer has been made linear by the use of springs, i.e. Dines anemometer.

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

An instrument designed to record the duration of sunshine at a given location without regard to intensity. See Campbell- Stokes recorder, Jordan sunshine recorder, Marvin sunshine recorder, Pers sunshine recorder.

The amount of precipitation captured by a rain gauge.

The volume of water required to cover one acre to a depth of one foot: 43,560 cubic feet.

Situated on the side from which the wind blows.

A common type of terrestrial scintillation; shimmering over a hot surface (such as a roadway) on a quiet, cloudless. summer day.

The transducer of any hygrometer, i.e. that part of a hygrometer that quantitatively "senses" atmospheric water vapor.