A component of the wind (often using Cartesian coordinates. i.e. X and Y wind vectors). Also, an arrow representing wind velocity, drawn to point in the direction of the wind and with a length proportional to wind speed.

See foehn.

Same as constant-level balloon.

In general, pertaining to or affording an overall view. In meteorology, this term has become somewhat specialized in referring to the use of meteorological data obtained simultaneously over a wide area for the purpose of obtaining a comprehensive and near ...

A recording hair hygrometer.

A standard unit of atmospheric pressure, defined as the pressure exerted by a 760 mm column of mercury at standard gravity (980.665 cm/sec2 ) at O

A conductor or system of conductors for radiating and/or receiving radio energy. Also called aerial.

The size of the area comprising a watershed or river basin. Also called catchment area.

A thermometer based upon the principle that the velocity of a sound wave is a function of the temperature of the medium through which it passes. Sonic thermometers possess very short time-constants and eliminate radiation error.

A system of physical units based on the use of the centimeter, gram. and the second as elementary quantities of length. mass. and time.

A magnetometer of the electromagnetic type which is used to measure the horizontal intensity of the earth's magnetic field.

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

The process by which water in plants is transferred as water vapor to the atmosphere. Also, the amount of water so transferred.

Growth of a cloud or precipitation particle by the collision and union of a frozen particle with a super-cooled water drop.

The process by which small particles suspended in a medium of a different refractive index diffuse a portion of the incident radiation in all directions. In scattering no energy transformation results, only a change in the spatial distribution of the radi ...

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

An instrument used to measure the water vapor content of the air. A type of hygrometer. It consists of a wet-bulb and a dry-bulb thermometer. See aspiration psychrometer, Assmann psychrometer. hygrodeik, sling psychrometer.

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

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 measure of the intrinsic luminous intensity emitted by a source in a given direction. Luminance is a measure only of light. The comparable term for electromagnetic radiation in general is radiance.