See radar theodolite, radio direction-finder.

The number of cycles per second between the limits of a frequency band.

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).

A device used on certain types of instruments to prevent unwanted radiation from affecting the measurement of a quantity. Also called solar radiation shield.

An instrument used to determine atmospheric pressure or elevation by observing the boiling point of water or both liquids. The sensitivity of the hypsometer increases with decreasing pressure, making it more useful for high altitude work.

The rate of decrease of temperature with height when unsaturated air is lifted adiabatically (without exchange of heat with its surroundings). The decrease is due to expansion as the air is lifted to a lower pressure.

Situated on the side from which the wind blows.

A severe weather condition characterized by low temperatures and strong winds bearing a great amount of snow, either falling or picked up from the ground.

See foehn.

A standard interface between a computer input/output port and a peripheral device. Signal properties including time duration, voltage. and current, are specified by the Electronic Industries Association.

A chronograph used to make a time-record of certain measured meteorological elements. The most common type, the triple register, records wind direction and speed, duration of sunshine, and amount of rainfall (sensed respectively by a contact anemometer, M ...

Same as wind sock.

Generally, the relative states of inflow, outflow, and storage of moisture over a given area of earth's surface.

A fabric cone attached to a metal ring and used to indicate wind direction. often at airfields.

The correctable part of the inaccuracy of an instrument.

A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.

Same as marine rainbow.

The inherent imprecision of a given process of measurement, the unpredictable component of repeated independent measurements of the same object under sensibly uniform conditions.

The wind speed and direction at various levels in the atmosphere above the level reached by surface weather observations.

An instrument for measuring the difference between incoming and outgoing terrestrial radiation.